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fune/layout/base/PresShell.cpp
Emilio Cobos Álvarez e78109826b Bug 1890576 - Make root element color-scheme affect widget appearance. r=mstange,mac-reviewers 
Instead of relying on the embedder color-scheme directly, use the
color-scheme property to determine the nsCocoaWindow's appearance.

This is more in line with what content does, would've prevented this bug
from existing altogether, and avoids the need for MOZGlobalAppearance.

Differential Revision: https://phabricator.services.mozilla.com/D207050
2024-05-02 15:41:14 +00:00

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* a presentation of a document, part 2 */
#include "mozilla/PresShell.h"
#include "Units.h"
#include "mozilla/EventForwards.h"
#include "mozilla/RefPtr.h"
#include "mozilla/dom/AncestorIterator.h"
#include "mozilla/dom/FontFaceSet.h"
#include "mozilla/dom/ElementBinding.h"
#include "mozilla/dom/FragmentDirective.h"
#include "mozilla/dom/LargestContentfulPaint.h"
#include "mozilla/dom/MouseEventBinding.h"
#include "mozilla/dom/PerformanceMainThread.h"
#include "mozilla/dom/HTMLAreaElement.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/Attributes.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/CaretAssociationHint.h"
#include "mozilla/ContentIterator.h"
#include "mozilla/DisplayPortUtils.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/GeckoMVMContext.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/IntegerRange.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/BrowserChild.h"
#include "mozilla/Likely.h"
#include "mozilla/Logging.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/PerfStats.h"
#include "mozilla/PointerLockManager.h"
#include "mozilla/PresShellInlines.h"
#include "mozilla/RangeUtils.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/Sprintf.h"
#include "mozilla/StaticAnalysisFunctions.h"
#include "mozilla/StaticPrefs_apz.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/StaticPrefs_font.h"
#include "mozilla/StaticPrefs_image.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/StaticPrefs_test.h"
#include "mozilla/StaticPrefs_toolkit.h"
#include "mozilla/Try.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Unused.h"
#include "mozilla/ViewportUtils.h"
#include "mozilla/gfx/Types.h"
#include <algorithm>
#ifdef XP_WIN
# include "winuser.h"
#endif
#include "gfxContext.h"
#include "gfxUserFontSet.h"
#include "nsContentList.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "mozilla/dom/BrowserBridgeChild.h"
#include "mozilla/dom/BrowsingContext.h"
#include "mozilla/dom/CanonicalBrowsingContext.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/PointerEventHandler.h"
#include "mozilla/dom/PopupBlocker.h"
#include "mozilla/dom/DOMIntersectionObserver.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/UserActivation.h"
#include "nsAnimationManager.h"
#include "nsNameSpaceManager.h" // for Pref-related rule management (bugs 22963,20760,31816)
#include "nsFlexContainerFrame.h"
#include "nsIFrame.h"
#include "nsViewManager.h"
#include "nsView.h"
#include "nsCRTGlue.h"
#include "prinrval.h"
#include "nsTArray.h"
#include "nsCOMArray.h"
#include "nsContainerFrame.h"
#include "mozilla/dom/Selection.h"
#include "nsGkAtoms.h"
#include "nsRange.h"
#include "nsWindowSizes.h"
#include "nsCOMPtr.h"
#include "nsReadableUtils.h"
#include "nsPageSequenceFrame.h"
#include "nsCaret.h"
#include "mozilla/AccessibleCaretEventHub.h"
#include "nsFrameManager.h"
#include "nsXPCOM.h"
#include "nsILayoutHistoryState.h"
#include "nsILineIterator.h" // for ScrollContentIntoView
#include "PLDHashTable.h"
#include "mozilla/dom/Touch.h"
#include "mozilla/dom/TouchEvent.h"
#include "mozilla/dom/PointerEventBinding.h"
#include "mozilla/dom/ShadowIncludingTreeIterator.h"
#include "nsIObserverService.h"
#include "nsDocShell.h" // for reflow observation
#include "nsIBaseWindow.h"
#include "nsError.h"
#include "nsLayoutUtils.h"
#include "nsViewportInfo.h"
#include "nsCSSRendering.h"
// for |#ifdef DEBUG| code
#include "prenv.h"
#include "nsDisplayList.h"
#include "nsRegion.h"
#include "nsAutoLayoutPhase.h"
#include "AutoProfilerStyleMarker.h"
#ifdef MOZ_REFLOW_PERF
# include "nsFontMetrics.h"
#endif
#include "MobileViewportManager.h"
#include "OverflowChangedTracker.h"
#include "PositionedEventTargeting.h"
#include "nsIReflowCallback.h"
#include "nsPIDOMWindow.h"
#include "nsFocusManager.h"
#include "nsNetUtil.h"
#include "nsThreadUtils.h"
#include "nsStyleSheetService.h"
#include "gfxUtils.h"
#include "mozilla/SMILAnimationController.h"
#include "mozilla/dom/SVGAnimationElement.h"
#include "mozilla/SVGObserverUtils.h"
#include "mozilla/SVGFragmentIdentifier.h"
#include "nsFrameSelection.h"
#include "mozilla/dom/Performance.h"
#include "nsRefreshDriver.h"
#include "nsDOMNavigationTiming.h"
// Drag & Drop, Clipboard
#include "nsIDocShellTreeItem.h"
#include "nsIURI.h"
#include "nsIScrollableFrame.h"
#include "nsITimer.h"
#ifdef ACCESSIBILITY
# include "mozilla/a11y/DocAccessible.h"
# ifdef DEBUG
# include "mozilla/a11y/Logging.h"
# endif
#endif
// For style data reconstruction
#include "nsStyleChangeList.h"
#include "nsCSSFrameConstructor.h"
#include "nsTreeBodyFrame.h"
#include "XULTreeElement.h"
#include "nsMenuPopupFrame.h"
#include "nsTreeColumns.h"
#include "nsIDOMXULMultSelectCntrlEl.h"
#include "nsIDOMXULSelectCntrlItemEl.h"
#include "nsIDOMXULMenuListElement.h"
#include "nsXULElement.h"
#include "mozilla/layers/CompositorBridgeChild.h"
#include "gfxPlatform.h"
#include "mozilla/css/ImageLoader.h"
#include "mozilla/dom/DocumentTimeline.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/Preferences.h"
#include "mozilla/Telemetry.h"
#include "nsCanvasFrame.h"
#include "nsImageFrame.h"
#include "nsIScreen.h"
#include "nsIScreenManager.h"
#include "nsPlaceholderFrame.h"
#include "nsTransitionManager.h"
#include "ChildIterator.h"
#include "mozilla/RestyleManager.h"
#include "nsIDragSession.h"
#include "nsIFrameInlines.h"
#include "mozilla/gfx/2D.h"
#include "nsNetUtil.h"
#include "nsSubDocumentFrame.h"
#include "nsQueryObject.h"
#include "mozilla/GlobalStyleSheetCache.h"
#include "mozilla/layers/InputAPZContext.h"
#include "mozilla/layers/FocusTarget.h"
#include "mozilla/layers/ScrollingInteractionContext.h"
#include "mozilla/layers/WebRenderLayerManager.h"
#include "mozilla/layers/WebRenderUserData.h"
#include "mozilla/layout/ScrollAnchorContainer.h"
#include "mozilla/layers/APZPublicUtils.h"
#include "mozilla/ProfilerLabels.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/ScrollTimelineAnimationTracker.h"
#include "mozilla/ScrollTypes.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/ServoStyleSet.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/InputTaskManager.h"
#include "mozilla/dom/ImageTracker.h"
#include "nsIDocShellTreeOwner.h"
#include "nsClassHashtable.h"
#include "nsGlobalWindowOuter.h"
#include "nsHashKeys.h"
#include "ScrollSnap.h"
#include "VisualViewport.h"
#include "ZoomConstraintsClient.h"
// define the scalfactor of drag and drop images
// relative to the max screen height/width
#define RELATIVE_SCALEFACTOR 0.0925f
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::layers;
using namespace mozilla::gfx;
using namespace mozilla::layout;
using PaintFrameFlags = nsLayoutUtils::PaintFrameFlags;
typedef ScrollableLayerGuid::ViewID ViewID;
PresShell::CapturingContentInfo PresShell::sCapturingContentInfo;
// RangePaintInfo is used to paint ranges to offscreen buffers
struct RangePaintInfo {
RefPtr<nsRange> mRange;
nsDisplayListBuilder mBuilder;
nsDisplayList mList;
// offset of builder's reference frame to the root frame
nsPoint mRootOffset;
// Resolution at which the items are normally painted. So if we're painting
// these items in a range separately from the "full display list", we may want
// to paint them at this resolution.
float mResolution = 1.0;
RangePaintInfo(nsRange* aRange, nsIFrame* aFrame)
: mRange(aRange),
mBuilder(aFrame, nsDisplayListBuilderMode::Painting, false),
mList(&mBuilder) {
MOZ_COUNT_CTOR(RangePaintInfo);
mBuilder.BeginFrame();
}
~RangePaintInfo() {
mList.DeleteAll(&mBuilder);
mBuilder.EndFrame();
MOZ_COUNT_DTOR(RangePaintInfo);
}
};
#undef NOISY
// ----------------------------------------------------------------------
#ifdef DEBUG
// Set the environment variable GECKO_VERIFY_REFLOW_FLAGS to one or
// more of the following flags (comma separated) for handy debug
// output.
static VerifyReflowFlags gVerifyReflowFlags;
struct VerifyReflowFlagData {
const char* name;
VerifyReflowFlags bit;
};
static const VerifyReflowFlagData gFlags[] = {
// clang-format off
{ "verify", VerifyReflowFlags::On },
{ "reflow", VerifyReflowFlags::Noisy },
{ "all", VerifyReflowFlags::All },
{ "list-commands", VerifyReflowFlags::DumpCommands },
{ "noisy-commands", VerifyReflowFlags::NoisyCommands },
{ "really-noisy-commands", VerifyReflowFlags::ReallyNoisyCommands },
{ "resize", VerifyReflowFlags::DuringResizeReflow },
// clang-format on
};
# define NUM_VERIFY_REFLOW_FLAGS (sizeof(gFlags) / sizeof(gFlags[0]))
static void ShowVerifyReflowFlags() {
printf("Here are the available GECKO_VERIFY_REFLOW_FLAGS:\n");
const VerifyReflowFlagData* flag = gFlags;
const VerifyReflowFlagData* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
while (flag < limit) {
printf(" %s\n", flag->name);
++flag;
}
printf("Note: GECKO_VERIFY_REFLOW_FLAGS is a comma separated list of flag\n");
printf("names (no whitespace)\n");
}
#endif
//========================================================================
//========================================================================
//========================================================================
#ifdef MOZ_REFLOW_PERF
class ReflowCountMgr;
static const char kGrandTotalsStr[] = "Grand Totals";
// Counting Class
class ReflowCounter {
public:
explicit ReflowCounter(ReflowCountMgr* aMgr = nullptr);
~ReflowCounter();
void ClearTotals();
void DisplayTotals(const char* aStr);
void DisplayDiffTotals(const char* aStr);
void DisplayHTMLTotals(const char* aStr);
void Add() { mTotal++; }
void Add(uint32_t aTotal) { mTotal += aTotal; }
void CalcDiffInTotals();
void SetTotalsCache();
void SetMgr(ReflowCountMgr* aMgr) { mMgr = aMgr; }
uint32_t GetTotal() { return mTotal; }
protected:
void DisplayTotals(uint32_t aTotal, const char* aTitle);
void DisplayHTMLTotals(uint32_t aTotal, const char* aTitle);
uint32_t mTotal;
uint32_t mCacheTotal;
ReflowCountMgr* mMgr; // weak reference (don't delete)
};
// Counting Class
class IndiReflowCounter {
public:
explicit IndiReflowCounter(ReflowCountMgr* aMgr = nullptr)
: mFrame(nullptr),
mCount(0),
mMgr(aMgr),
mCounter(aMgr),
mHasBeenOutput(false) {}
virtual ~IndiReflowCounter() = default;
nsAutoString mName;
nsIFrame* mFrame; // weak reference (don't delete)
int32_t mCount;
ReflowCountMgr* mMgr; // weak reference (don't delete)
ReflowCounter mCounter;
bool mHasBeenOutput;
};
//--------------------
// Manager Class
//--------------------
class ReflowCountMgr {
public:
ReflowCountMgr();
virtual ~ReflowCountMgr();
void ClearTotals();
void ClearGrandTotals();
void DisplayTotals(const char* aStr);
void DisplayHTMLTotals(const char* aStr);
void DisplayDiffsInTotals();
void Add(const char* aName, nsIFrame* aFrame);
ReflowCounter* LookUp(const char* aName);
void PaintCount(const char* aName, gfxContext* aRenderingContext,
nsPresContext* aPresContext, nsIFrame* aFrame,
const nsPoint& aOffset, uint32_t aColor);
FILE* GetOutFile() { return mFD; }
void SetPresContext(nsPresContext* aPresContext) {
mPresContext = aPresContext; // weak reference
}
void SetPresShell(PresShell* aPresShell) {
mPresShell = aPresShell; // weak reference
}
void SetDumpFrameCounts(bool aVal) { mDumpFrameCounts = aVal; }
void SetDumpFrameByFrameCounts(bool aVal) { mDumpFrameByFrameCounts = aVal; }
void SetPaintFrameCounts(bool aVal) { mPaintFrameByFrameCounts = aVal; }
bool IsPaintingFrameCounts() { return mPaintFrameByFrameCounts; }
protected:
void DisplayTotals(uint32_t aTotal, uint32_t* aDupArray, char* aTitle);
void DisplayHTMLTotals(uint32_t aTotal, uint32_t* aDupArray, char* aTitle);
void DoGrandTotals();
void DoIndiTotalsTree();
// HTML Output Methods
void DoGrandHTMLTotals();
nsClassHashtable<nsCharPtrHashKey, ReflowCounter> mCounts;
nsClassHashtable<nsCharPtrHashKey, IndiReflowCounter> mIndiFrameCounts;
FILE* mFD;
bool mDumpFrameCounts;
bool mDumpFrameByFrameCounts;
bool mPaintFrameByFrameCounts;
bool mCycledOnce;
// Root Frame for Individual Tracking
nsPresContext* mPresContext;
PresShell* mPresShell;
// ReflowCountMgr gReflowCountMgr;
};
#endif
//========================================================================
// comment out to hide caret
#define SHOW_CARET
// The upper bound on the amount of time to spend reflowing, in
// microseconds. When this bound is exceeded and reflow commands are
// still queued up, a reflow event is posted. The idea is for reflow
// to not hog the processor beyond the time specifed in
// gMaxRCProcessingTime. This data member is initialized from the
// layout.reflow.timeslice pref.
#define NS_MAX_REFLOW_TIME 1000000
static int32_t gMaxRCProcessingTime = -1;
struct nsCallbackEventRequest {
nsIReflowCallback* callback;
nsCallbackEventRequest* next;
};
// ----------------------------------------------------------------------------
//
// NOTE(emilio): It'd be nice for this to assert that our document isn't in the
// bfcache, but font pref changes don't care about that, and maybe / probably
// shouldn't.
#ifdef DEBUG
# define ASSERT_REFLOW_SCHEDULED_STATE() \
{ \
if (ObservingLayoutFlushes()) { \
MOZ_ASSERT( \
mDocument->GetBFCacheEntry() || \
mPresContext->RefreshDriver()->IsLayoutFlushObserver(this), \
"Unexpected state"); \
} else { \
MOZ_ASSERT( \
!mPresContext->RefreshDriver()->IsLayoutFlushObserver(this), \
"Unexpected state"); \
} \
}
#else
# define ASSERT_REFLOW_SCHEDULED_STATE() /* nothing */
#endif
class nsAutoCauseReflowNotifier {
public:
MOZ_CAN_RUN_SCRIPT explicit nsAutoCauseReflowNotifier(PresShell* aPresShell)
: mPresShell(aPresShell) {
mPresShell->WillCauseReflow();
}
MOZ_CAN_RUN_SCRIPT ~nsAutoCauseReflowNotifier() {
// This check should not be needed. Currently the only place that seem
// to need it is the code that deals with bug 337586.
if (!mPresShell->mHaveShutDown) {
RefPtr<PresShell> presShell(mPresShell);
presShell->DidCauseReflow();
} else {
nsContentUtils::RemoveScriptBlocker();
}
}
PresShell* mPresShell;
};
class MOZ_STACK_CLASS nsPresShellEventCB : public EventDispatchingCallback {
public:
explicit nsPresShellEventCB(PresShell* aPresShell) : mPresShell(aPresShell) {}
MOZ_CAN_RUN_SCRIPT
virtual void HandleEvent(EventChainPostVisitor& aVisitor) override {
if (aVisitor.mPresContext && aVisitor.mEvent->mClass != eBasicEventClass) {
if (aVisitor.mEvent->mMessage == eMouseDown ||
aVisitor.mEvent->mMessage == eMouseUp) {
// Mouse-up and mouse-down events call nsIFrame::HandlePress/Release
// which call GetContentOffsetsFromPoint which requires up-to-date
// layout. Bring layout up-to-date now so that GetCurrentEventFrame()
// below will return a real frame and we don't have to worry about
// destroying it by flushing later.
MOZ_KnownLive(mPresShell)->FlushPendingNotifications(FlushType::Layout);
} else if (aVisitor.mEvent->mMessage == eWheel &&
aVisitor.mEventStatus != nsEventStatus_eConsumeNoDefault) {
nsIFrame* frame = mPresShell->GetCurrentEventFrame();
if (frame) {
// chrome (including addons) should be able to know if content
// handles both D3E "wheel" event and legacy mouse scroll events.
// We should dispatch legacy mouse events before dispatching the
// "wheel" event into system group.
RefPtr<EventStateManager> esm =
aVisitor.mPresContext->EventStateManager();
esm->DispatchLegacyMouseScrollEvents(
frame, aVisitor.mEvent->AsWheelEvent(), &aVisitor.mEventStatus);
}
}
nsIFrame* frame = mPresShell->GetCurrentEventFrame();
if (!frame && (aVisitor.mEvent->mMessage == eMouseUp ||
aVisitor.mEvent->mMessage == eTouchEnd)) {
// Redirect BUTTON_UP and TOUCH_END events to the root frame to ensure
// that capturing is released.
frame = mPresShell->GetRootFrame();
}
if (frame) {
frame->HandleEvent(aVisitor.mPresContext, aVisitor.mEvent->AsGUIEvent(),
&aVisitor.mEventStatus);
}
}
}
RefPtr<PresShell> mPresShell;
};
class nsBeforeFirstPaintDispatcher : public Runnable {
public:
explicit nsBeforeFirstPaintDispatcher(Document* aDocument)
: mozilla::Runnable("nsBeforeFirstPaintDispatcher"),
mDocument(aDocument) {}
// Fires the "before-first-paint" event so that interested parties (right now,
// the mobile browser) are aware of it.
NS_IMETHOD Run() override {
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(ToSupports(mDocument),
"before-first-paint", nullptr);
}
return NS_OK;
}
private:
RefPtr<Document> mDocument;
};
// This is a helper class to track whether the targeted frame is destroyed after
// dispatching pointer events. In that case, we need the original targeted
// content so that we can dispatch the mouse events to it.
class MOZ_STACK_CLASS AutoPointerEventTargetUpdater final {
public:
AutoPointerEventTargetUpdater(PresShell* aShell, WidgetEvent* aEvent,
nsIFrame* aFrame, nsIContent* aTargetContent,
nsIContent** aOutTargetContent) {
MOZ_ASSERT(aEvent);
if (!aOutTargetContent || aEvent->mClass != ePointerEventClass) {
// Make the destructor happy.
mOutTargetContent = nullptr;
return;
}
MOZ_ASSERT(aShell);
MOZ_ASSERT_IF(aFrame && aFrame->GetContent(),
aShell->GetDocument() == aFrame->GetContent()->OwnerDoc());
mShell = aShell;
mWeakFrame = aFrame;
mOutTargetContent = aOutTargetContent;
mFromTouch = aEvent->AsPointerEvent()->mFromTouchEvent;
// Touch event target may have no frame, e.g., removed from the DOM
MOZ_ASSERT_IF(!mFromTouch, aFrame);
mOriginalPointerEventTarget = aShell->mPointerEventTarget =
aFrame ? aFrame->GetContent() : aTargetContent;
}
~AutoPointerEventTargetUpdater() {
if (!mOutTargetContent || !mShell || mWeakFrame.IsAlive()) {
return;
}
if (mFromTouch) {
// If the source event is a touch event, the touch event target should
// always be same target as preceding ePointerDown. Therefore, we should
// always set it back to the original event target.
mOriginalPointerEventTarget.swap(*mOutTargetContent);
} else {
// If the source event is not a touch event (must be a mouse event in
// this case), the event should be fired on the closest inclusive ancestor
// of the pointer event target which is still connected. The mutations
// are tracked by PresShell::ContentRemoved. Therefore, we should set it.
mShell->mPointerEventTarget.swap(*mOutTargetContent);
}
}
private:
RefPtr<PresShell> mShell;
nsCOMPtr<nsIContent> mOriginalPointerEventTarget;
AutoWeakFrame mWeakFrame;
nsIContent** mOutTargetContent;
bool mFromTouch = false;
};
bool PresShell::sDisableNonTestMouseEvents = false;
int16_t PresShell::sMouseButtons = MouseButtonsFlag::eNoButtons;
LazyLogModule PresShell::gLog("PresShell");
TimeStamp PresShell::EventHandler::sLastInputCreated;
TimeStamp PresShell::EventHandler::sLastInputProcessed;
StaticRefPtr<Element> PresShell::EventHandler::sLastKeyDownEventTargetElement;
bool PresShell::sProcessInteractable = false;
static bool gVerifyReflowEnabled;
bool PresShell::GetVerifyReflowEnable() {
#ifdef DEBUG
static bool firstTime = true;
if (firstTime) {
firstTime = false;
char* flags = PR_GetEnv("GECKO_VERIFY_REFLOW_FLAGS");
if (flags) {
bool error = false;
for (;;) {
char* comma = strchr(flags, ',');
if (comma) *comma = '\0';
bool found = false;
const VerifyReflowFlagData* flag = gFlags;
const VerifyReflowFlagData* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
while (flag < limit) {
if (nsCRT::strcasecmp(flag->name, flags) == 0) {
gVerifyReflowFlags |= flag->bit;
found = true;
break;
}
++flag;
}
if (!found) error = true;
if (!comma) break;
*comma = ',';
flags = comma + 1;
}
if (error) ShowVerifyReflowFlags();
}
if (VerifyReflowFlags::On & gVerifyReflowFlags) {
gVerifyReflowEnabled = true;
printf("Note: verifyreflow is enabled");
if (VerifyReflowFlags::Noisy & gVerifyReflowFlags) {
printf(" (noisy)");
}
if (VerifyReflowFlags::All & gVerifyReflowFlags) {
printf(" (all)");
}
if (VerifyReflowFlags::DumpCommands & gVerifyReflowFlags) {
printf(" (show reflow commands)");
}
if (VerifyReflowFlags::NoisyCommands & gVerifyReflowFlags) {
printf(" (noisy reflow commands)");
if (VerifyReflowFlags::ReallyNoisyCommands & gVerifyReflowFlags) {
printf(" (REALLY noisy reflow commands)");
}
}
printf("\n");
}
}
#endif
return gVerifyReflowEnabled;
}
void PresShell::SetVerifyReflowEnable(bool aEnabled) {
gVerifyReflowEnabled = aEnabled;
}
void PresShell::AddAutoWeakFrame(AutoWeakFrame* aWeakFrame) {
if (aWeakFrame->GetFrame()) {
aWeakFrame->GetFrame()->AddStateBits(NS_FRAME_EXTERNAL_REFERENCE);
}
aWeakFrame->SetPreviousWeakFrame(mAutoWeakFrames);
mAutoWeakFrames = aWeakFrame;
}
void PresShell::AddWeakFrame(WeakFrame* aWeakFrame) {
if (aWeakFrame->GetFrame()) {
aWeakFrame->GetFrame()->AddStateBits(NS_FRAME_EXTERNAL_REFERENCE);
}
MOZ_ASSERT(!mWeakFrames.Contains(aWeakFrame));
mWeakFrames.Insert(aWeakFrame);
}
void PresShell::RemoveAutoWeakFrame(AutoWeakFrame* aWeakFrame) {
if (mAutoWeakFrames == aWeakFrame) {
mAutoWeakFrames = aWeakFrame->GetPreviousWeakFrame();
return;
}
AutoWeakFrame* nextWeak = mAutoWeakFrames;
while (nextWeak && nextWeak->GetPreviousWeakFrame() != aWeakFrame) {
nextWeak = nextWeak->GetPreviousWeakFrame();
}
if (nextWeak) {
nextWeak->SetPreviousWeakFrame(aWeakFrame->GetPreviousWeakFrame());
}
}
void PresShell::RemoveWeakFrame(WeakFrame* aWeakFrame) {
MOZ_ASSERT(mWeakFrames.Contains(aWeakFrame));
mWeakFrames.Remove(aWeakFrame);
}
already_AddRefed<nsFrameSelection> PresShell::FrameSelection() {
RefPtr<nsFrameSelection> ret = mSelection;
return ret.forget();
}
//----------------------------------------------------------------------
static uint32_t sNextPresShellId = 0;
/* static */
bool PresShell::AccessibleCaretEnabled(nsIDocShell* aDocShell) {
// If the pref forces it on, then enable it.
if (StaticPrefs::layout_accessiblecaret_enabled()) {
return true;
}
// If the touch pref is on, and touch events are enabled (this depends
// on the specific device running), then enable it.
if (StaticPrefs::layout_accessiblecaret_enabled_on_touch() &&
dom::TouchEvent::PrefEnabled(aDocShell)) {
return true;
}
// Otherwise, disabled.
return false;
}
PresShell::PresShell(Document* aDocument)
: mDocument(aDocument),
mViewManager(nullptr),
mFrameManager(nullptr),
mAutoWeakFrames(nullptr),
#ifdef ACCESSIBILITY
mDocAccessible(nullptr),
#endif // ACCESSIBILITY
mCurrentEventFrame(nullptr),
mMouseLocation(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE),
mLastResolutionChangeOrigin(ResolutionChangeOrigin::Apz),
mPaintCount(0),
mAPZFocusSequenceNumber(0),
mActiveSuppressDisplayport(0),
mPresShellId(++sNextPresShellId),
mFontSizeInflationEmPerLine(0),
mFontSizeInflationMinTwips(0),
mFontSizeInflationLineThreshold(0),
mSelectionFlags(nsISelectionDisplay::DISPLAY_TEXT |
nsISelectionDisplay::DISPLAY_IMAGES),
mChangeNestCount(0),
mRenderingStateFlags(RenderingStateFlags::None),
mInFlush(false),
mCaretEnabled(false),
mNeedLayoutFlush(true),
mNeedStyleFlush(true),
mNeedThrottledAnimationFlush(true),
mVisualViewportSizeSet(false),
mDidInitialize(false),
mIsDestroying(false),
mIsReflowing(false),
mIsObservingDocument(false),
mForbiddenToFlush(false),
mIsDocumentGone(false),
mHaveShutDown(false),
mPaintingSuppressed(false),
mLastRootReflowHadUnconstrainedBSize(false),
mShouldUnsuppressPainting(false),
mIgnoreFrameDestruction(false),
mIsActive(true),
mFrozen(false),
mIsFirstPaint(true),
mObservesMutationsForPrint(false),
mWasLastReflowInterrupted(false),
mObservingStyleFlushes(false),
mObservingLayoutFlushes(false),
mResizeEventPending(false),
mFontSizeInflationForceEnabled(false),
mFontSizeInflationDisabledInMasterProcess(false),
mFontSizeInflationEnabled(false),
mIsNeverPainting(false),
mResolutionUpdated(false),
mResolutionUpdatedByApz(false),
mUnderHiddenEmbedderElement(false),
mDocumentLoading(false),
mNoDelayedMouseEvents(false),
mNoDelayedKeyEvents(false),
mApproximateFrameVisibilityVisited(false),
mIsLastChromeOnlyEscapeKeyConsumed(false),
mHasReceivedPaintMessage(false),
mIsLastKeyDownCanceled(false),
mHasHandledUserInput(false),
mForceDispatchKeyPressEventsForNonPrintableKeys(false),
mForceUseLegacyKeyCodeAndCharCodeValues(false),
mInitializedWithKeyPressEventDispatchingBlacklist(false),
mMouseLocationWasSetBySynthesizedMouseEventForTests(false),
mHasTriedFastUnsuppress(false),
mProcessingReflowCommands(false),
mPendingDidDoReflow(false) {
MOZ_LOG(gLog, LogLevel::Debug, ("PresShell::PresShell this=%p", this));
MOZ_ASSERT(aDocument);
#ifdef MOZ_REFLOW_PERF
mReflowCountMgr = MakeUnique<ReflowCountMgr>();
mReflowCountMgr->SetPresContext(mPresContext);
mReflowCountMgr->SetPresShell(this);
#endif
mLastOSWake = mLoadBegin = TimeStamp::Now();
}
NS_INTERFACE_TABLE_HEAD(PresShell)
NS_INTERFACE_TABLE_BEGIN
// In most cases, PresShell should be treated as concrete class, but need to
// QI for weak reference. Therefore, the case needed by do_QueryReferent()
// should be tested first.
NS_INTERFACE_TABLE_ENTRY(PresShell, PresShell)
NS_INTERFACE_TABLE_ENTRY(PresShell, nsIDocumentObserver)
NS_INTERFACE_TABLE_ENTRY(PresShell, nsISelectionController)
NS_INTERFACE_TABLE_ENTRY(PresShell, nsISelectionDisplay)
NS_INTERFACE_TABLE_ENTRY(PresShell, nsIObserver)
NS_INTERFACE_TABLE_ENTRY(PresShell, nsISupportsWeakReference)
NS_INTERFACE_TABLE_ENTRY(PresShell, nsIMutationObserver)
NS_INTERFACE_TABLE_ENTRY_AMBIGUOUS(PresShell, nsISupports, nsIObserver)
NS_INTERFACE_TABLE_END
NS_INTERFACE_TABLE_TO_MAP_SEGUE
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(PresShell)
NS_IMPL_RELEASE(PresShell)
PresShell::~PresShell() {
MOZ_RELEASE_ASSERT(!mForbiddenToFlush,
"Flag should only be set temporarily, while doing things "
"that shouldn't cause destruction");
MOZ_LOG(gLog, LogLevel::Debug, ("PresShell::~PresShell this=%p", this));
if (!mHaveShutDown) {
MOZ_ASSERT_UNREACHABLE("Someone did not call PresShell::Destroy()");
Destroy();
}
NS_ASSERTION(mCurrentEventContentStack.Count() == 0,
"Huh, event content left on the stack in pres shell dtor!");
NS_ASSERTION(mFirstCallbackEventRequest == nullptr &&
mLastCallbackEventRequest == nullptr,
"post-reflow queues not empty. This means we're leaking");
MOZ_ASSERT(!mAllocatedPointers || mAllocatedPointers->IsEmpty(),
"Some pres arena objects were not freed");
mFrameManager = nullptr;
mFrameConstructor = nullptr;
mCurrentEventContent = nullptr;
}
/**
* Initialize the presentation shell. Create view manager and style
* manager.
* Note this can't be merged into our constructor because caret initialization
* calls AddRef() on us.
*/
void PresShell::Init(nsPresContext* aPresContext, nsViewManager* aViewManager) {
MOZ_ASSERT(mDocument);
MOZ_ASSERT(aPresContext);
MOZ_ASSERT(aViewManager);
MOZ_ASSERT(!mViewManager, "already initialized");
mViewManager = aViewManager;
// mDocument is now set. It might have a display document whose "need layout/
// style" flush flags are not set, but ours will be set. To keep these
// consistent, call the flag setting functions to propagate those flags up
// to the display document.
SetNeedLayoutFlush();
SetNeedStyleFlush();
// Create our frame constructor.
mFrameConstructor = MakeUnique<nsCSSFrameConstructor>(mDocument, this);
mFrameManager = mFrameConstructor.get();
// The document viewer owns both view manager and pres shell.
mViewManager->SetPresShell(this);
// Bind the context to the presentation shell.
// FYI: We cannot initialize mPresContext in the constructor because we
// cannot call AttachPresShell() in it and once we initialize
// mPresContext, other objects may refer refresh driver or restyle
// manager via mPresContext and that causes hitting MOZ_ASSERT in some
// places. Therefore, we should initialize mPresContext here with
// const_cast hack since we want to guarantee that mPresContext lives
// as long as the PresShell.
const_cast<RefPtr<nsPresContext>&>(mPresContext) = aPresContext;
mPresContext->AttachPresShell(this);
mPresContext->InitFontCache();
// FIXME(emilio, bug 1544185): Some Android code somehow depends on the shell
// being eagerly registered as a style flush observer. This shouldn't be
// needed otherwise.
EnsureStyleFlush();
const bool accessibleCaretEnabled =
AccessibleCaretEnabled(mDocument->GetDocShell());
if (accessibleCaretEnabled) {
// Need to happen before nsFrameSelection has been set up.
mAccessibleCaretEventHub = new AccessibleCaretEventHub(this);
mAccessibleCaretEventHub->Init();
}
mSelection = new nsFrameSelection(this, nullptr, accessibleCaretEnabled);
// Important: this has to happen after the selection has been set up
#ifdef SHOW_CARET
// make the caret
mCaret = new nsCaret();
mCaret->Init(this);
mOriginalCaret = mCaret;
// SetCaretEnabled(true); // make it show in browser windows
#endif
// set up selection to be displayed in document
// Don't enable selection for print media
nsPresContext::nsPresContextType type = mPresContext->Type();
if (type != nsPresContext::eContext_PrintPreview &&
type != nsPresContext::eContext_Print) {
SetDisplaySelection(nsISelectionController::SELECTION_DISABLED);
}
if (gMaxRCProcessingTime == -1) {
gMaxRCProcessingTime =
Preferences::GetInt("layout.reflow.timeslice", NS_MAX_REFLOW_TIME);
}
if (nsStyleSheetService* ss = nsStyleSheetService::GetInstance()) {
ss->RegisterPresShell(this);
}
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->AddObserver(this, "memory-pressure", false);
os->AddObserver(this, NS_WIDGET_WAKE_OBSERVER_TOPIC, false);
if (XRE_IsParentProcess() && !sProcessInteractable) {
os->AddObserver(this, "sessionstore-one-or-no-tab-restored", false);
}
os->AddObserver(this, "font-info-updated", false);
os->AddObserver(this, "internal-look-and-feel-changed", false);
}
}
#ifdef MOZ_REFLOW_PERF
if (mReflowCountMgr) {
bool paintFrameCounts =
Preferences::GetBool("layout.reflow.showframecounts");
bool dumpFrameCounts =
Preferences::GetBool("layout.reflow.dumpframecounts");
bool dumpFrameByFrameCounts =
Preferences::GetBool("layout.reflow.dumpframebyframecounts");
mReflowCountMgr->SetDumpFrameCounts(dumpFrameCounts);
mReflowCountMgr->SetDumpFrameByFrameCounts(dumpFrameByFrameCounts);
mReflowCountMgr->SetPaintFrameCounts(paintFrameCounts);
}
#endif
if (mDocument->HasAnimationController()) {
SMILAnimationController* animCtrl = mDocument->GetAnimationController();
animCtrl->NotifyRefreshDriverCreated(GetPresContext()->RefreshDriver());
}
for (DocumentTimeline* timeline : mDocument->Timelines()) {
timeline->NotifyRefreshDriverCreated(GetPresContext()->RefreshDriver());
}
// Get our activeness from the docShell.
ActivenessMaybeChanged();
// Setup our font inflation preferences.
mFontSizeInflationEmPerLine = StaticPrefs::font_size_inflation_emPerLine();
mFontSizeInflationMinTwips = StaticPrefs::font_size_inflation_minTwips();
mFontSizeInflationLineThreshold =
StaticPrefs::font_size_inflation_lineThreshold();
mFontSizeInflationForceEnabled =
StaticPrefs::font_size_inflation_forceEnabled();
mFontSizeInflationDisabledInMasterProcess =
StaticPrefs::font_size_inflation_disabledInMasterProcess();
// We'll compute the font size inflation state in Initialize(), when we know
// the document type.
mTouchManager.Init(this, mDocument);
if (mPresContext->IsRootContentDocumentCrossProcess()) {
mZoomConstraintsClient = new ZoomConstraintsClient();
mZoomConstraintsClient->Init(this, mDocument);
// We call this to create mMobileViewportManager, if it is needed.
MaybeRecreateMobileViewportManager(false);
}
if (nsCOMPtr<nsIDocShell> docShell = mPresContext->GetDocShell()) {
if (BrowsingContext* bc = docShell->GetBrowsingContext()) {
mUnderHiddenEmbedderElement = bc->IsUnderHiddenEmbedderElement();
}
}
}
enum TextPerfLogType { eLog_reflow, eLog_loaddone, eLog_totals };
static void LogTextPerfStats(gfxTextPerfMetrics* aTextPerf,
PresShell* aPresShell,
const gfxTextPerfMetrics::TextCounts& aCounts,
float aTime, TextPerfLogType aLogType,
const char* aURL) {
LogModule* tpLog = gfxPlatform::GetLog(eGfxLog_textperf);
// ignore XUL contexts unless at debug level
mozilla::LogLevel logLevel = LogLevel::Warning;
if (aCounts.numContentTextRuns == 0) {
logLevel = LogLevel::Debug;
}
if (!MOZ_LOG_TEST(tpLog, logLevel)) {
return;
}
char prefix[256];
switch (aLogType) {
case eLog_reflow:
SprintfLiteral(prefix, "(textperf-reflow) %p time-ms: %7.0f", aPresShell,
aTime);
break;
case eLog_loaddone:
SprintfLiteral(prefix, "(textperf-loaddone) %p time-ms: %7.0f",
aPresShell, aTime);
break;
default:
MOZ_ASSERT(aLogType == eLog_totals, "unknown textperf log type");
SprintfLiteral(prefix, "(textperf-totals) %p", aPresShell);
}
double hitRatio = 0.0;
uint32_t lookups = aCounts.wordCacheHit + aCounts.wordCacheMiss;
if (lookups) {
hitRatio = double(aCounts.wordCacheHit) / double(lookups);
}
if (aLogType == eLog_loaddone) {
MOZ_LOG(
tpLog, logLevel,
("%s reflow: %d chars: %d "
"[%s] "
"content-textruns: %d chrome-textruns: %d "
"max-textrun-len: %d "
"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
"word-cache-space: %d word-cache-long: %d "
"pref-fallbacks: %d system-fallbacks: %d "
"textruns-const: %d textruns-destr: %d "
"generic-lookups: %d "
"cumulative-textruns-destr: %d\n",
prefix, aTextPerf->reflowCount, aCounts.numChars, (aURL ? aURL : ""),
aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
aCounts.maxTextRunLen, lookups, hitRatio, aCounts.wordCacheSpaceRules,
aCounts.wordCacheLong, aCounts.fallbackPrefs, aCounts.fallbackSystem,
aCounts.textrunConst, aCounts.textrunDestr, aCounts.genericLookups,
aTextPerf->cumulative.textrunDestr));
} else {
MOZ_LOG(
tpLog, logLevel,
("%s reflow: %d chars: %d "
"content-textruns: %d chrome-textruns: %d "
"max-textrun-len: %d "
"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
"word-cache-space: %d word-cache-long: %d "
"pref-fallbacks: %d system-fallbacks: %d "
"textruns-const: %d textruns-destr: %d "
"generic-lookups: %d "
"cumulative-textruns-destr: %d\n",
prefix, aTextPerf->reflowCount, aCounts.numChars,
aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
aCounts.maxTextRunLen, lookups, hitRatio, aCounts.wordCacheSpaceRules,
aCounts.wordCacheLong, aCounts.fallbackPrefs, aCounts.fallbackSystem,
aCounts.textrunConst, aCounts.textrunDestr, aCounts.genericLookups,
aTextPerf->cumulative.textrunDestr));
}
}
bool PresShell::InRDMPane() {
if (Document* doc = GetDocument()) {
if (BrowsingContext* bc = doc->GetBrowsingContext()) {
return bc->InRDMPane();
}
}
return false;
}
#if defined(MOZ_WIDGET_ANDROID)
void PresShell::MaybeNotifyShowDynamicToolbar() {
const DynamicToolbarState dynToolbarState = GetDynamicToolbarState();
if ((dynToolbarState == DynamicToolbarState::Collapsed ||
dynToolbarState == DynamicToolbarState::InTransition)) {
MOZ_ASSERT(mPresContext &&
mPresContext->IsRootContentDocumentCrossProcess());
if (BrowserChild* browserChild = BrowserChild::GetFrom(this)) {
browserChild->SendShowDynamicToolbar();
}
}
}
#endif // defined(MOZ_WIDGET_ANDROID)
void PresShell::Destroy() {
// Do not add code before this line please!
if (mHaveShutDown) {
return;
}
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"destroy called on presshell while scripts not blocked");
[[maybe_unused]] nsIURI* uri = mDocument->GetDocumentURI();
AUTO_PROFILER_LABEL_DYNAMIC_NSCSTRING_RELEVANT_FOR_JS(
"Layout tree destruction", LAYOUT_Destroy,
uri ? uri->GetSpecOrDefault() : "N/A"_ns);
// Try to determine if the page is the user had a meaningful opportunity to
// zoom this page. This is not 100% accurate but should be "good enough" for
// telemetry purposes.
auto isUserZoomablePage = [&]() -> bool {
if (mIsFirstPaint) {
// Page was never painted, so it wasn't zoomable by the user. We get a
// handful of these "transient" presShells.
return false;
}
if (!mPresContext->IsRootContentDocumentCrossProcess()) {
// Not a root content document, so APZ doesn't support zooming it.
return false;
}
if (InRDMPane()) {
// Responsive design mode is a special case that we want to ignore here.
return false;
}
if (mDocument && mDocument->IsInitialDocument()) {
// Ignore initial about:blank page loads
return false;
}
if (XRE_IsContentProcess() &&
IsExtensionRemoteType(ContentChild::GetSingleton()->GetRemoteType())) {
// Also omit presShells from the extension process because they sometimes
// can't be zoomed by the user.
return false;
}
// Otherwise assume the page is user-zoomable.
return true;
};
if (isUserZoomablePage()) {
Telemetry::Accumulate(Telemetry::APZ_ZOOM_ACTIVITY,
IsResolutionUpdatedByApz());
}
// dump out cumulative text perf metrics
gfxTextPerfMetrics* tp;
if (mPresContext && (tp = mPresContext->GetTextPerfMetrics())) {
tp->Accumulate();
if (tp->cumulative.numChars > 0) {
LogTextPerfStats(tp, this, tp->cumulative, 0.0, eLog_totals, nullptr);
}
}
if (mPresContext) {
if (gfxUserFontSet* fs = mPresContext->GetUserFontSet()) {
uint32_t fontCount;
uint64_t fontSize;
fs->GetLoadStatistics(fontCount, fontSize);
Telemetry::Accumulate(Telemetry::WEBFONT_PER_PAGE, fontCount);
Telemetry::Accumulate(Telemetry::WEBFONT_SIZE_PER_PAGE,
uint32_t(fontSize / 1024));
} else {
Telemetry::Accumulate(Telemetry::WEBFONT_PER_PAGE, 0);
Telemetry::Accumulate(Telemetry::WEBFONT_SIZE_PER_PAGE, 0);
}
}
#ifdef MOZ_REFLOW_PERF
DumpReflows();
mReflowCountMgr = nullptr;
#endif
if (mZoomConstraintsClient) {
mZoomConstraintsClient->Destroy();
mZoomConstraintsClient = nullptr;
}
if (mMobileViewportManager) {
mMobileViewportManager->Destroy();
mMobileViewportManager = nullptr;
mMVMContext = nullptr;
}
#ifdef ACCESSIBILITY
if (mDocAccessible) {
# ifdef DEBUG
if (a11y::logging::IsEnabled(a11y::logging::eDocDestroy))
a11y::logging::DocDestroy("presshell destroyed", mDocument);
# endif
mDocAccessible->Shutdown();
mDocAccessible = nullptr;
}
#endif // ACCESSIBILITY
MaybeReleaseCapturingContent();
EventHandler::OnPresShellDestroy(mDocument);
if (mContentToScrollTo) {
mContentToScrollTo->RemoveProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
}
if (mPresContext) {
// We need to notify the destroying the nsPresContext to ESM for
// suppressing to use from ESM.
mPresContext->EventStateManager()->NotifyDestroyPresContext(mPresContext);
}
if (nsStyleSheetService* ss = nsStyleSheetService::GetInstance()) {
ss->UnregisterPresShell(this);
}
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->RemoveObserver(this, "memory-pressure");
os->RemoveObserver(this, NS_WIDGET_WAKE_OBSERVER_TOPIC);
if (XRE_IsParentProcess()) {
os->RemoveObserver(this, "sessionstore-one-or-no-tab-restored");
}
os->RemoveObserver(this, "font-info-updated");
os->RemoveObserver(this, "internal-look-and-feel-changed");
}
}
// If our paint suppression timer is still active, kill it.
CancelPaintSuppressionTimer();
// Same for our reflow continuation timer
if (mReflowContinueTimer) {
mReflowContinueTimer->Cancel();
mReflowContinueTimer = nullptr;
}
mSynthMouseMoveEvent.Revoke();
mUpdateApproximateFrameVisibilityEvent.Revoke();
ClearApproximatelyVisibleFramesList(Some(OnNonvisible::DiscardImages));
if (mOriginalCaret) {
mOriginalCaret->Terminate();
}
if (mCaret && mCaret != mOriginalCaret) {
mCaret->Terminate();
}
mCaret = mOriginalCaret = nullptr;
mFocusedFrameSelection = nullptr;
if (mSelection) {
RefPtr<nsFrameSelection> frameSelection = mSelection;
frameSelection->DisconnectFromPresShell();
}
mIsDestroying = true;
// We can't release all the event content in
// mCurrentEventContentStack here since there might be code on the
// stack that will release the event content too. Double release
// bad!
// The frames will be torn down, so remove them from the current
// event frame stack (since they'd be dangling references if we'd
// leave them in) and null out the mCurrentEventFrame pointer as
// well.
mCurrentEventFrame = nullptr;
int32_t i, count = mCurrentEventFrameStack.Length();
for (i = 0; i < count; i++) {
mCurrentEventFrameStack[i] = nullptr;
}
mFramesToDirty.Clear();
mPendingScrollAnchorSelection.Clear();
mPendingScrollAnchorAdjustment.Clear();
mPendingScrollResnap.Clear();
if (mViewManager) {
// Clear the view manager's weak pointer back to |this| in case it
// was leaked.
mViewManager->SetPresShell(nullptr);
mViewManager = nullptr;
}
nsRefreshDriver* rd = GetPresContext()->RefreshDriver();
// This shell must be removed from the document before the frame
// hierarchy is torn down to avoid finding deleted frames through
// this presshell while the frames are being torn down
if (mDocument) {
NS_ASSERTION(mDocument->GetPresShell() == this, "Wrong shell?");
mDocument->ClearServoRestyleRoot();
mDocument->DeletePresShell();
if (mDocument->HasAnimationController()) {
mDocument->GetAnimationController()->NotifyRefreshDriverDestroying(rd);
}
for (DocumentTimeline* timeline : mDocument->Timelines()) {
timeline->NotifyRefreshDriverDestroying(rd);
}
}
if (mPresContext) {
rd->CancelPendingAnimationEvents(mPresContext->AnimationEventDispatcher());
}
// Revoke any pending events. We need to do this and cancel pending reflows
// before we destroy the frame manager, since apparently frame destruction
// sometimes spins the event queue when plug-ins are involved(!).
// XXXmats is this still needed now that plugins are gone?
StopObservingRefreshDriver();
if (rd->GetPresContext() == GetPresContext()) {
rd->RevokeViewManagerFlush();
rd->ClearHasScheduleFlush();
}
CancelAllPendingReflows();
CancelPostedReflowCallbacks();
// Destroy the frame manager. This will destroy the frame hierarchy
mFrameConstructor->WillDestroyFrameTree();
NS_WARNING_ASSERTION(!mAutoWeakFrames && mWeakFrames.IsEmpty(),
"Weak frames alive after destroying FrameManager");
while (mAutoWeakFrames) {
mAutoWeakFrames->Clear(this);
}
const nsTArray<WeakFrame*> weakFrames = ToArray(mWeakFrames);
for (WeakFrame* weakFrame : weakFrames) {
weakFrame->Clear(this);
}
// Terminate AccessibleCaretEventHub after tearing down the frame tree so that
// we don't need to remove caret element's frame in
// AccessibleCaret::RemoveCaretElement().
if (mAccessibleCaretEventHub) {
mAccessibleCaretEventHub->Terminate();
mAccessibleCaretEventHub = nullptr;
}
if (mPresContext) {
// We hold a reference to the pres context, and it holds a weak link back
// to us. To avoid the pres context having a dangling reference, set its
// pres shell to nullptr
mPresContext->DetachPresShell();
}
mHaveShutDown = true;
mTouchManager.Destroy();
}
void PresShell::StopObservingRefreshDriver() {
nsRefreshDriver* rd = mPresContext->RefreshDriver();
if (mResizeEventPending) {
rd->RemoveResizeEventFlushObserver(this);
}
if (mObservingLayoutFlushes) {
rd->RemoveLayoutFlushObserver(this);
}
if (mObservingStyleFlushes) {
rd->RemoveStyleFlushObserver(this);
}
}
void PresShell::StartObservingRefreshDriver() {
nsRefreshDriver* rd = mPresContext->RefreshDriver();
if (mResizeEventPending) {
rd->AddResizeEventFlushObserver(this);
}
if (mObservingLayoutFlushes) {
rd->AddLayoutFlushObserver(this);
}
if (mObservingStyleFlushes) {
rd->AddStyleFlushObserver(this);
}
}
nsRefreshDriver* PresShell::GetRefreshDriver() const {
return mPresContext ? mPresContext->RefreshDriver() : nullptr;
}
void PresShell::SetAuthorStyleDisabled(bool aStyleDisabled) {
if (aStyleDisabled != StyleSet()->GetAuthorStyleDisabled()) {
StyleSet()->SetAuthorStyleDisabled(aStyleDisabled);
mDocument->ApplicableStylesChanged();
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(
ToSupports(mDocument), "author-style-disabled-changed", nullptr);
}
}
}
bool PresShell::GetAuthorStyleDisabled() const {
return StyleSet()->GetAuthorStyleDisabled();
}
void PresShell::AddUserSheet(StyleSheet* aSheet) {
// Make sure this does what nsDocumentViewer::CreateStyleSet does wrt
// ordering. We want this new sheet to come after all the existing stylesheet
// service sheets (which are at the start), but before other user sheets; see
// nsIStyleSheetService.idl for the ordering.
nsStyleSheetService* sheetService = nsStyleSheetService::GetInstance();
nsTArray<RefPtr<StyleSheet>>& userSheets = *sheetService->UserStyleSheets();
// Search for the place to insert the new user sheet. Since all of the
// stylesheet service provided user sheets should be at the start of the style
// set's list, and aSheet should be at the end of userSheets. Given that, we
// can find the right place to insert the new sheet based on the length of
// userSheets.
MOZ_ASSERT(aSheet);
MOZ_ASSERT(userSheets.LastElement() == aSheet);
size_t index = userSheets.Length() - 1;
// Assert that all of userSheets (except for the last, new element) matches up
// with what's in the style set.
for (size_t i = 0; i < index; ++i) {
MOZ_ASSERT(StyleSet()->SheetAt(StyleOrigin::User, i) == userSheets[i]);
}
if (index == static_cast<size_t>(StyleSet()->SheetCount(StyleOrigin::User))) {
StyleSet()->AppendStyleSheet(*aSheet);
} else {
StyleSheet* ref = StyleSet()->SheetAt(StyleOrigin::User, index);
StyleSet()->InsertStyleSheetBefore(*aSheet, *ref);
}
mDocument->ApplicableStylesChanged();
}
void PresShell::AddAgentSheet(StyleSheet* aSheet) {
// Make sure this does what nsDocumentViewer::CreateStyleSet does
// wrt ordering.
StyleSet()->AppendStyleSheet(*aSheet);
mDocument->ApplicableStylesChanged();
}
void PresShell::AddAuthorSheet(StyleSheet* aSheet) {
// Document specific "additional" Author sheets should be stronger than the
// ones added with the StyleSheetService.
StyleSheet* firstAuthorSheet = mDocument->GetFirstAdditionalAuthorSheet();
if (firstAuthorSheet) {
StyleSet()->InsertStyleSheetBefore(*aSheet, *firstAuthorSheet);
} else {
StyleSet()->AppendStyleSheet(*aSheet);
}
mDocument->ApplicableStylesChanged();
}
bool PresShell::FixUpFocus() {
if (NS_WARN_IF(!mDocument)) {
return false;
}
nsIContent* currentFocus = mDocument->GetUnretargetedFocusedContent(
Document::IncludeChromeOnly::Yes);
if (!currentFocus) {
return false;
}
// If focus target is an area element with one or more shapes that are
// focusable areas.
if (auto* area = HTMLAreaElement::FromNode(currentFocus)) {
if (nsFocusManager::IsAreaElementFocusable(*area)) {
return false;
}
}
nsIFrame* f = currentFocus->GetPrimaryFrame();
if (f && f->IsFocusable()) {
return false;
}
if (currentFocus == mDocument->GetBody() ||
currentFocus == mDocument->GetRootElement()) {
return false;
}
RefPtr fm = nsFocusManager::GetFocusManager();
nsCOMPtr<nsPIDOMWindowOuter> window = mDocument->GetWindow();
if (NS_WARN_IF(!window)) {
return false;
}
fm->ClearFocus(window);
return true;
}
void PresShell::SelectionWillTakeFocus() {
if (mSelection) {
FrameSelectionWillTakeFocus(*mSelection);
}
}
void PresShell::SelectionWillLoseFocus() {
// Do nothing, the main selection is the default focused selection.
}
// Selection repainting code relies on selection offsets being properly
// adjusted (see bug 1626291), so we need to wait until the DOM is finished
// notifying.
static void RepaintNormalSelectionWhenSafe(nsFrameSelection& aFrameSelection) {
if (nsContentUtils::IsSafeToRunScript()) {
aFrameSelection.RepaintSelection(SelectionType::eNormal);
return;
}
// Note that importantly we don't defer changing the DisplaySelection. That'd
// be potentially racy with other code that may change it.
nsContentUtils::AddScriptRunner(NS_NewRunnableFunction(
"RepaintNormalSelectionWhenSafe",
[sel = RefPtr<nsFrameSelection>(&aFrameSelection)] {
sel->RepaintSelection(SelectionType::eNormal);
}));
}
void PresShell::FrameSelectionWillLoseFocus(nsFrameSelection& aFrameSelection) {
if (mFocusedFrameSelection != &aFrameSelection) {
return;
}
// Do nothing, the main selection is the default focused selection.
if (&aFrameSelection == mSelection) {
return;
}
RefPtr<nsFrameSelection> old = std::move(mFocusedFrameSelection);
MOZ_ASSERT(!mFocusedFrameSelection);
if (old->GetDisplaySelection() != nsISelectionController::SELECTION_HIDDEN) {
old->SetDisplaySelection(nsISelectionController::SELECTION_HIDDEN);
RepaintNormalSelectionWhenSafe(*old);
}
if (mSelection) {
FrameSelectionWillTakeFocus(*mSelection);
}
}
void PresShell::FrameSelectionWillTakeFocus(nsFrameSelection& aFrameSelection) {
if (mFocusedFrameSelection == &aFrameSelection) {
#ifdef XP_MACOSX
// FIXME: Mac needs to update the global selection cache, even if the
// document's focused selection doesn't change, and this is currently done
// from RepaintSelection. Maybe we should move part of the global selection
// handling here, or something of that sort, unclear.
RepaintNormalSelectionWhenSafe(aFrameSelection);
#endif
return;
}
RefPtr<nsFrameSelection> old = std::move(mFocusedFrameSelection);
mFocusedFrameSelection = &aFrameSelection;
if (old &&
old->GetDisplaySelection() != nsISelectionController::SELECTION_HIDDEN) {
old->SetDisplaySelection(nsISelectionController::SELECTION_HIDDEN);
RepaintNormalSelectionWhenSafe(*old);
}
if (aFrameSelection.GetDisplaySelection() !=
nsISelectionController::SELECTION_ON) {
aFrameSelection.SetDisplaySelection(nsISelectionController::SELECTION_ON);
RepaintNormalSelectionWhenSafe(aFrameSelection);
}
}
NS_IMETHODIMP
PresShell::SetDisplaySelection(int16_t aToggle) {
RefPtr<nsFrameSelection> frameSelection = mSelection;
frameSelection->SetDisplaySelection(aToggle);
return NS_OK;
}
NS_IMETHODIMP
PresShell::GetDisplaySelection(int16_t* aToggle) {
RefPtr<nsFrameSelection> frameSelection = mSelection;
*aToggle = frameSelection->GetDisplaySelection();
return NS_OK;
}
NS_IMETHODIMP
PresShell::GetSelectionFromScript(RawSelectionType aRawSelectionType,
Selection** aSelection) {
if (!aSelection || !mSelection) return NS_ERROR_NULL_POINTER;
RefPtr<nsFrameSelection> frameSelection = mSelection;
RefPtr<Selection> selection =
frameSelection->GetSelection(ToSelectionType(aRawSelectionType));
if (!selection) {
return NS_ERROR_INVALID_ARG;
}
selection.forget(aSelection);
return NS_OK;
}
Selection* PresShell::GetSelection(RawSelectionType aRawSelectionType) {
if (!mSelection) {
return nullptr;
}
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->GetSelection(ToSelectionType(aRawSelectionType));
}
Selection* PresShell::GetCurrentSelection(SelectionType aSelectionType) {
if (!mSelection) {
return nullptr;
}
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->GetSelection(aSelectionType);
}
nsFrameSelection* PresShell::GetLastFocusedFrameSelection() {
return mFocusedFrameSelection ? mFocusedFrameSelection : mSelection;
}
NS_IMETHODIMP
PresShell::ScrollSelectionIntoView(RawSelectionType aRawSelectionType,
SelectionRegion aRegion, int16_t aFlags) {
if (!mSelection) return NS_ERROR_NULL_POINTER;
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->ScrollSelectionIntoView(
ToSelectionType(aRawSelectionType), aRegion, aFlags);
}
NS_IMETHODIMP
PresShell::RepaintSelection(RawSelectionType aRawSelectionType) {
if (!mSelection) {
return NS_ERROR_NULL_POINTER;
}
if (MOZ_UNLIKELY(mIsDestroying)) {
return NS_OK;
}
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->RepaintSelection(ToSelectionType(aRawSelectionType));
}
// Make shell be a document observer
void PresShell::BeginObservingDocument() {
if (mDocument && !mIsDestroying) {
mIsObservingDocument = true;
if (mIsDocumentGone) {
NS_WARNING(
"Adding a presshell that was disconnected from the document "
"as a document observer? Sounds wrong...");
mIsDocumentGone = false;
}
}
}
// Make shell stop being a document observer
void PresShell::EndObservingDocument() {
// XXXbz do we need to tell the frame constructor that the document
// is gone, perhaps? Except for printing it's NOT gone, sometimes.
mIsDocumentGone = true;
mIsObservingDocument = false;
}
#ifdef DEBUG_kipp
char* nsPresShell_ReflowStackPointerTop;
#endif
void PresShell::InitPaintSuppressionTimer() {
// Default to PAINTLOCK_EVENT_DELAY if we can't get the pref value.
Document* doc = mDocument->GetDisplayDocument()
? mDocument->GetDisplayDocument()
: mDocument.get();
const bool inProcess = !doc->GetBrowsingContext() ||
doc->GetBrowsingContext()->Top()->IsInProcess();
int32_t delay = inProcess
? StaticPrefs::nglayout_initialpaint_delay()
: StaticPrefs::nglayout_initialpaint_delay_in_oopif();
mPaintSuppressionTimer->InitWithNamedFuncCallback(
[](nsITimer* aTimer, void* aPresShell) {
RefPtr<PresShell> self = static_cast<PresShell*>(aPresShell);
self->UnsuppressPainting();
},
this, delay, nsITimer::TYPE_ONE_SHOT,
"PresShell::sPaintSuppressionCallback");
}
nsresult PresShell::Initialize() {
if (mIsDestroying) {
return NS_OK;
}
if (!mDocument) {
// Nothing to do
return NS_OK;
}
MOZ_LOG(gLog, LogLevel::Debug, ("PresShell::Initialize this=%p", this));
NS_ASSERTION(!mDidInitialize, "Why are we being called?");
RefPtr<PresShell> kungFuDeathGrip(this);
RecomputeFontSizeInflationEnabled();
MOZ_DIAGNOSTIC_ASSERT(!mIsDestroying);
// Ensure the pres context doesn't think it has changed, since we haven't even
// started layout. This avoids spurious restyles / reflows afterwards.
//
// Note that this is very intentionally before setting mDidInitialize so it
// doesn't notify the document, or run media query change events.
mPresContext->FlushPendingMediaFeatureValuesChanged();
MOZ_DIAGNOSTIC_ASSERT(!mIsDestroying);
mDidInitialize = true;
#ifdef DEBUG
if (VerifyReflowFlags::NoisyCommands & gVerifyReflowFlags) {
if (mDocument) {
nsIURI* uri = mDocument->GetDocumentURI();
if (uri) {
printf("*** PresShell::Initialize (this=%p, url='%s')\n", (void*)this,
uri->GetSpecOrDefault().get());
}
}
}
#endif
// Get the root frame from the frame manager
// XXXbz it would be nice to move this somewhere else... like frame manager
// Init(), say. But we need to make sure our views are all set up by the
// time we do this!
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
NS_ASSERTION(!rootFrame, "How did that happen, exactly?");
if (!rootFrame) {
nsAutoScriptBlocker scriptBlocker;
rootFrame = mFrameConstructor->ConstructRootFrame();
mFrameConstructor->SetRootFrame(rootFrame);
}
NS_ENSURE_STATE(!mHaveShutDown);
if (!rootFrame) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (Element* root = mDocument->GetRootElement()) {
{
nsAutoCauseReflowNotifier reflowNotifier(this);
// Have the style sheet processor construct frame for the root
// content object down
mFrameConstructor->ContentInserted(
root, nsCSSFrameConstructor::InsertionKind::Sync);
}
// Something in mFrameConstructor->ContentInserted may have caused
// Destroy() to get called, bug 337586. Or, nsAutoCauseReflowNotifier
// (which sets up a script blocker) going out of scope may have killed us
// too
NS_ENSURE_STATE(!mHaveShutDown);
}
if (mDocument->HasAutoFocusCandidates()) {
mDocument->ScheduleFlushAutoFocusCandidates();
}
NS_ASSERTION(rootFrame, "How did that happen?");
// Note: when the frame was created above it had the NS_FRAME_IS_DIRTY bit
// set, but XBL processing could have caused a reflow which clears it.
if (MOZ_LIKELY(rootFrame->HasAnyStateBits(NS_FRAME_IS_DIRTY))) {
// Unset the DIRTY bits so that FrameNeedsReflow() will work right.
rootFrame->RemoveStateBits(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN);
NS_ASSERTION(!mDirtyRoots.Contains(rootFrame),
"Why is the root in mDirtyRoots already?");
FrameNeedsReflow(rootFrame, IntrinsicDirty::None, NS_FRAME_IS_DIRTY);
NS_ASSERTION(mDirtyRoots.Contains(rootFrame),
"Should be in mDirtyRoots now");
NS_ASSERTION(mObservingLayoutFlushes, "Why no reflow scheduled?");
}
// Restore our root scroll position now if we're getting here after EndLoad
// got called, since this is our one chance to do it. Note that we need not
// have reflowed for this to work; when the scrollframe is finally reflowed
// it'll pick up the position we store in it here.
if (!mDocumentLoading) {
RestoreRootScrollPosition();
}
// For printing, we just immediately unsuppress.
if (!mPresContext->IsPaginated()) {
// Kick off a one-shot timer based off our pref value. When this timer
// fires, if painting is still locked down, then we will go ahead and
// trigger a full invalidate and allow painting to proceed normally.
mPaintingSuppressed = true;
// Don't suppress painting if the document isn't loading.
Document::ReadyState readyState = mDocument->GetReadyStateEnum();
if (readyState != Document::READYSTATE_COMPLETE) {
mPaintSuppressionTimer = NS_NewTimer();
}
if (!mPaintSuppressionTimer) {
mPaintingSuppressed = false;
} else {
// Initialize the timer.
mPaintSuppressionTimer->SetTarget(GetMainThreadSerialEventTarget());
InitPaintSuppressionTimer();
if (mHasTriedFastUnsuppress) {
// Someone tried to unsuppress painting before Initialize was called so
// unsuppress painting rather soon.
mHasTriedFastUnsuppress = false;
TryUnsuppressPaintingSoon();
MOZ_ASSERT(mHasTriedFastUnsuppress);
}
}
}
// If we get here and painting is not suppressed, we still want to run the
// unsuppression logic, so set mShouldUnsuppressPainting to true.
if (!mPaintingSuppressed) {
mShouldUnsuppressPainting = true;
}
return NS_OK; // XXX this needs to be real. MMP
}
void PresShell::TryUnsuppressPaintingSoon() {
if (mHasTriedFastUnsuppress) {
return;
}
mHasTriedFastUnsuppress = true;
if (!mDidInitialize || !IsPaintingSuppressed() || !XRE_IsContentProcess()) {
return;
}
if (!mDocument->IsInitialDocument() &&
mDocument->DidHitCompleteSheetCache() &&
mPresContext->IsRootContentDocumentCrossProcess()) {
// Try to unsuppress faster on a top level page if it uses stylesheet
// cache, since that hints that many resources can be painted sooner than
// in a cold page load case.
NS_DispatchToCurrentThreadQueue(
NS_NewRunnableFunction("PresShell::TryUnsuppressPaintingSoon",
[self = RefPtr{this}]() -> void {
if (self->IsPaintingSuppressed()) {
PROFILER_MARKER_UNTYPED(
"Fast paint unsuppression", GRAPHICS);
self->UnsuppressPainting();
}
}),
EventQueuePriority::Control);
}
}
void PresShell::RefreshZoomConstraintsForScreenSizeChange() {
if (mZoomConstraintsClient) {
mZoomConstraintsClient->ScreenSizeChanged();
}
}
void PresShell::ForceResizeReflowWithCurrentDimensions() {
nscoord currentWidth = 0;
nscoord currentHeight = 0;
mViewManager->GetWindowDimensions(&currentWidth, &currentHeight);
ResizeReflow(currentWidth, currentHeight);
}
void PresShell::ResizeReflow(nscoord aWidth, nscoord aHeight,
ResizeReflowOptions aOptions) {
if (mZoomConstraintsClient) {
// If we have a ZoomConstraintsClient and the available screen area
// changed, then we might need to disable double-tap-to-zoom, so notify
// the ZCC to update itself.
mZoomConstraintsClient->ScreenSizeChanged();
}
if (UsesMobileViewportSizing()) {
// If we are using mobile viewport sizing, request a reflow from the MVM.
// It can recompute the final CSS viewport and trigger a call to
// ResizeReflowIgnoreOverride if it changed. We don't force adjusting
// of resolution, because that is only necessary when we are destroying
// the MVM.
MOZ_ASSERT(mMobileViewportManager);
mMobileViewportManager->RequestReflow(false);
return;
}
ResizeReflowIgnoreOverride(aWidth, aHeight, aOptions);
}
bool PresShell::SimpleResizeReflow(nscoord aWidth, nscoord aHeight) {
MOZ_ASSERT(aWidth != NS_UNCONSTRAINEDSIZE);
MOZ_ASSERT(aHeight != NS_UNCONSTRAINEDSIZE);
nsSize oldSize = mPresContext->GetVisibleArea().Size();
mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
return false;
}
WritingMode wm = rootFrame->GetWritingMode();
bool isBSizeChanging =
wm.IsVertical() ? oldSize.width != aWidth : oldSize.height != aHeight;
if (isBSizeChanging) {
nsLayoutUtils::MarkIntrinsicISizesDirtyIfDependentOnBSize(rootFrame);
}
FrameNeedsReflow(rootFrame, IntrinsicDirty::None,
NS_FRAME_HAS_DIRTY_CHILDREN);
if (mMobileViewportManager) {
mMobileViewportManager->UpdateSizesBeforeReflow();
}
return true;
}
bool PresShell::CanHandleUserInputEvents(WidgetGUIEvent* aGUIEvent) {
if (XRE_IsParentProcess()) {
return true;
}
if (aGUIEvent->mFlags.mIsSynthesizedForTests &&
!StaticPrefs::dom_input_events_security_isUserInputHandlingDelayTest()) {
return true;
}
if (!aGUIEvent->IsUserAction()) {
return true;
}
if (nsPresContext* rootPresContext = mPresContext->GetRootPresContext()) {
return rootPresContext->UserInputEventsAllowed();
}
return true;
}
void PresShell::AddResizeEventFlushObserverIfNeeded() {
if (!mIsDestroying && !mResizeEventPending &&
MOZ_LIKELY(!mDocument->GetBFCacheEntry())) {
mResizeEventPending = true;
mPresContext->RefreshDriver()->AddResizeEventFlushObserver(this);
}
}
bool PresShell::ResizeReflowIgnoreOverride(nscoord aWidth, nscoord aHeight,
ResizeReflowOptions aOptions) {
MOZ_ASSERT(!mIsReflowing, "Shouldn't be in reflow here!");
// Historically we never fired resize events if there was no root frame by the
// time this function got called.
const bool initialized = mDidInitialize;
RefPtr<PresShell> kungFuDeathGrip(this);
auto postResizeEventIfNeeded = [this, initialized]() {
if (initialized) {
AddResizeEventFlushObserverIfNeeded();
}
};
if (!(aOptions & ResizeReflowOptions::BSizeLimit)) {
nsSize oldSize = mPresContext->GetVisibleArea().Size();
if (oldSize == nsSize(aWidth, aHeight)) {
return false;
}
bool changed = SimpleResizeReflow(aWidth, aHeight);
postResizeEventIfNeeded();
return changed;
}
// Make sure that style is flushed before setting the pres context
// VisibleArea.
//
// Otherwise we may end up with bogus viewport units resolved against the
// unconstrained bsize, or restyling the whole document resolving viewport
// units against targetWidth, which may end up doing wasteful work.
mDocument->FlushPendingNotifications(FlushType::Frames);
nsIFrame* rootFrame = GetRootFrame();
if (mIsDestroying || !rootFrame) {
// If we don't have a root frame yet, that means we haven't had our initial
// reflow... If that's the case, and aWidth or aHeight is unconstrained,
// ignore them altogether.
if (aHeight == NS_UNCONSTRAINEDSIZE || aWidth == NS_UNCONSTRAINEDSIZE) {
// We can't do the work needed for SizeToContent without a root
// frame, and we want to return before setting the visible area.
return false;
}
mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
// There isn't anything useful we can do if the initial reflow hasn't
// happened.
return true;
}
WritingMode wm = rootFrame->GetWritingMode();
MOZ_ASSERT((wm.IsVertical() ? aHeight : aWidth) != NS_UNCONSTRAINEDSIZE,
"unconstrained isize not allowed");
nscoord targetWidth = aWidth;
nscoord targetHeight = aHeight;
if (wm.IsVertical()) {
targetWidth = NS_UNCONSTRAINEDSIZE;
} else {
targetHeight = NS_UNCONSTRAINEDSIZE;
}
mPresContext->SetVisibleArea(nsRect(0, 0, targetWidth, targetHeight));
// XXX Do a full invalidate at the beginning so that invalidates along
// the way don't have region accumulation issues?
// For height:auto BSizes (i.e. layout-controlled), descendant
// intrinsic sizes can't depend on them. So the only other case is
// viewport-controlled BSizes which we handle here.
nsLayoutUtils::MarkIntrinsicISizesDirtyIfDependentOnBSize(rootFrame);
{
nsAutoCauseReflowNotifier crNotifier(this);
WillDoReflow();
// Kick off a top-down reflow
AUTO_LAYOUT_PHASE_ENTRY_POINT(GetPresContext(), Reflow);
nsViewManager::AutoDisableRefresh refreshBlocker(mViewManager);
mDirtyRoots.Remove(rootFrame);
DoReflow(rootFrame, true, nullptr);
const bool reflowAgain =
wm.IsVertical() ? mPresContext->GetVisibleArea().width > aWidth
: mPresContext->GetVisibleArea().height > aHeight;
if (reflowAgain) {
mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
DoReflow(rootFrame, true, nullptr);
}
}
// Now, we may have been destroyed by the destructor of
// `nsAutoCauseReflowNotifier`.
mPendingDidDoReflow = true;
DidDoReflow(true);
// the reflow above should've set our bsize if it was NS_UNCONSTRAINEDSIZE,
// and the isize shouldn't be NS_UNCONSTRAINEDSIZE anyway.
MOZ_DIAGNOSTIC_ASSERT(
mPresContext->GetVisibleArea().width != NS_UNCONSTRAINEDSIZE,
"width should not be NS_UNCONSTRAINEDSIZE after reflow");
MOZ_DIAGNOSTIC_ASSERT(
mPresContext->GetVisibleArea().height != NS_UNCONSTRAINEDSIZE,
"height should not be NS_UNCONSTRAINEDSIZE after reflow");
postResizeEventIfNeeded();
return true;
}
void PresShell::FireResizeEvent() {
if (mIsDocumentGone) {
return;
}
// If event handling is suppressed, repost the resize event to the refresh
// driver. The event is marked as delayed so that the refresh driver does not
// continue ticking.
if (mDocument->EventHandlingSuppressed()) {
if (MOZ_LIKELY(!mDocument->GetBFCacheEntry())) {
mDocument->SetHasDelayedRefreshEvent();
mPresContext->RefreshDriver()->AddResizeEventFlushObserver(
this, /* aDelayed = */ true);
}
return;
}
mResizeEventPending = false;
FireResizeEventSync();
}
void PresShell::FireResizeEventSync() {
if (mIsDocumentGone) {
return;
}
// Send resize event from here.
WidgetEvent event(true, mozilla::eResize);
nsEventStatus status = nsEventStatus_eIgnore;
if (RefPtr<nsPIDOMWindowOuter> window = mDocument->GetWindow()) {
// MOZ_KnownLive due to bug 1506441
EventDispatcher::Dispatch(MOZ_KnownLive(nsGlobalWindowOuter::Cast(window)),
mPresContext, &event, nullptr, &status);
}
}
static nsIContent* GetNativeAnonymousSubtreeRoot(nsIContent* aContent) {
if (!aContent) {
return nullptr;
}
return aContent->GetClosestNativeAnonymousSubtreeRoot();
}
void PresShell::NativeAnonymousContentRemoved(nsIContent* aAnonContent) {
MOZ_ASSERT(aAnonContent->IsRootOfNativeAnonymousSubtree());
mPresContext->EventStateManager()->NativeAnonymousContentRemoved(
aAnonContent);
#ifdef ACCESSIBILITY
if (nsAccessibilityService* accService = GetAccService()) {
accService->ContentRemoved(this, aAnonContent);
}
#endif
if (mDocument->DevToolsAnonymousAndShadowEventsEnabled()) {
aAnonContent->QueueDevtoolsAnonymousEvent(/* aIsRemove = */ true);
}
if (nsIContent* root = GetNativeAnonymousSubtreeRoot(mCurrentEventContent)) {
if (aAnonContent == root) {
mCurrentEventContent = aAnonContent->GetFlattenedTreeParent();
mCurrentEventFrame = nullptr;
}
}
for (unsigned int i = 0; i < mCurrentEventContentStack.Length(); i++) {
nsIContent* anon =
GetNativeAnonymousSubtreeRoot(mCurrentEventContentStack.ElementAt(i));
if (aAnonContent == anon) {
mCurrentEventContentStack.ReplaceObjectAt(
aAnonContent->GetFlattenedTreeParent(), i);
mCurrentEventFrameStack[i] = nullptr;
}
}
}
void PresShell::SetIgnoreFrameDestruction(bool aIgnore) {
if (mDocument) {
// We need to tell the ImageLoader to drop all its references to frames
// because they're about to go away and it won't get notifications of that.
mDocument->StyleImageLoader()->ClearFrames(mPresContext);
}
mIgnoreFrameDestruction = aIgnore;
}
void PresShell::NotifyDestroyingFrame(nsIFrame* aFrame) {
// We must remove these from FrameLayerBuilder::DisplayItemData::mFrameList
// here, otherwise the DisplayItemData destructor will use the destroyed frame
// when it tries to remove it from the (array) value of this property.
aFrame->RemoveDisplayItemDataForDeletion();
if (!mIgnoreFrameDestruction) {
if (aFrame->HasImageRequest()) {
mDocument->StyleImageLoader()->DropRequestsForFrame(aFrame);
}
mFrameConstructor->NotifyDestroyingFrame(aFrame);
mDirtyRoots.Remove(aFrame);
// Remove frame properties
aFrame->RemoveAllProperties();
if (aFrame == mCurrentEventFrame) {
mCurrentEventContent = aFrame->GetContent();
mCurrentEventFrame = nullptr;
}
for (unsigned int i = 0; i < mCurrentEventFrameStack.Length(); i++) {
if (aFrame == mCurrentEventFrameStack.ElementAt(i)) {
// One of our stack frames was deleted. Get its content so that when we
// pop it we can still get its new frame from its content
nsIContent* currentEventContent = aFrame->GetContent();
mCurrentEventContentStack.ReplaceObjectAt(currentEventContent, i);
mCurrentEventFrameStack[i] = nullptr;
}
}
mFramesToDirty.Remove(aFrame);
nsIScrollableFrame* scrollableFrame = do_QueryFrame(aFrame);
if (scrollableFrame) {
mPendingScrollAnchorSelection.Remove(scrollableFrame);
mPendingScrollAnchorAdjustment.Remove(scrollableFrame);
mPendingScrollResnap.Remove(scrollableFrame);
}
}
}
already_AddRefed<nsCaret> PresShell::GetCaret() const {
RefPtr<nsCaret> caret = mCaret;
return caret.forget();
}
already_AddRefed<AccessibleCaretEventHub>
PresShell::GetAccessibleCaretEventHub() const {
RefPtr<AccessibleCaretEventHub> eventHub = mAccessibleCaretEventHub;
return eventHub.forget();
}
void PresShell::SetCaret(nsCaret* aNewCaret) {
if (mCaret == aNewCaret) {
return;
}
if (mCaret) {
mCaret->SchedulePaint();
}
mCaret = aNewCaret;
if (aNewCaret) {
aNewCaret->SchedulePaint();
}
}
void PresShell::RestoreCaret() { SetCaret(mOriginalCaret); }
NS_IMETHODIMP PresShell::SetCaretEnabled(bool aInEnable) {
bool oldEnabled = mCaretEnabled;
mCaretEnabled = aInEnable;
if (mCaretEnabled != oldEnabled) {
MOZ_ASSERT(mCaret);
if (mCaret) {
mCaret->SetVisible(mCaretEnabled);
}
}
return NS_OK;
}
NS_IMETHODIMP PresShell::SetCaretReadOnly(bool aReadOnly) {
if (mCaret) mCaret->SetCaretReadOnly(aReadOnly);
return NS_OK;
}
NS_IMETHODIMP PresShell::GetCaretEnabled(bool* aOutEnabled) {
NS_ENSURE_ARG_POINTER(aOutEnabled);
*aOutEnabled = mCaretEnabled;
return NS_OK;
}
NS_IMETHODIMP PresShell::SetCaretVisibilityDuringSelection(bool aVisibility) {
if (mCaret) mCaret->SetVisibilityDuringSelection(aVisibility);
return NS_OK;
}
NS_IMETHODIMP PresShell::GetCaretVisible(bool* aOutIsVisible) {
*aOutIsVisible = false;
if (mCaret) {
*aOutIsVisible = mCaret->IsVisible();
}
return NS_OK;
}
NS_IMETHODIMP PresShell::SetSelectionFlags(int16_t aFlags) {
mSelectionFlags = aFlags;
return NS_OK;
}
NS_IMETHODIMP PresShell::GetSelectionFlags(int16_t* aFlags) {
if (!aFlags) {
return NS_ERROR_INVALID_ARG;
}
*aFlags = mSelectionFlags;
return NS_OK;
}
// implementation of nsISelectionController
NS_IMETHODIMP
PresShell::PhysicalMove(int16_t aDirection, int16_t aAmount, bool aExtend) {
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->PhysicalMove(aDirection, aAmount, aExtend);
}
NS_IMETHODIMP
PresShell::CharacterMove(bool aForward, bool aExtend) {
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->CharacterMove(aForward, aExtend);
}
NS_IMETHODIMP
PresShell::WordMove(bool aForward, bool aExtend) {
RefPtr<nsFrameSelection> frameSelection = mSelection;
nsresult result = frameSelection->WordMove(aForward, aExtend);
// if we can't go down/up any more we must then move caret completely to
// end/beginning respectively.
if (NS_FAILED(result)) result = CompleteMove(aForward, aExtend);
return result;
}
NS_IMETHODIMP
PresShell::LineMove(bool aForward, bool aExtend) {
RefPtr<nsFrameSelection> frameSelection = mSelection;
nsresult result = frameSelection->LineMove(aForward, aExtend);
// if we can't go down/up any more we must then move caret completely to
// end/beginning respectively.
if (NS_FAILED(result)) result = CompleteMove(aForward, aExtend);
return result;
}
NS_IMETHODIMP
PresShell::IntraLineMove(bool aForward, bool aExtend) {
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->IntraLineMove(aForward, aExtend);
}
NS_IMETHODIMP
PresShell::PageMove(bool aForward, bool aExtend) {
nsIFrame* frame = nullptr;
if (!aExtend) {
frame = do_QueryFrame(GetScrollableFrameToScroll(VerticalScrollDirection));
// If there is no scrollable frame, get the frame to move caret instead.
}
if (!frame || frame->PresContext() != mPresContext) {
frame = mSelection->GetFrameToPageSelect();
if (!frame) {
return NS_OK;
}
}
// We may scroll parent scrollable element of current selection limiter.
// In such case, we don't want to scroll selection into view unless
// selection is changed.
RefPtr<nsFrameSelection> frameSelection = mSelection;
return frameSelection->PageMove(
aForward, aExtend, frame, nsFrameSelection::SelectionIntoView::IfChanged);
}
NS_IMETHODIMP
PresShell::ScrollPage(bool aForward) {
nsIScrollableFrame* scrollFrame =
GetScrollableFrameToScroll(VerticalScrollDirection);
ScrollMode scrollMode = apz::GetScrollModeForOrigin(ScrollOrigin::Pages);
if (scrollFrame) {
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1), ScrollUnit::PAGES,
scrollMode, nullptr,
mozilla::ScrollOrigin::NotSpecified,
nsIScrollableFrame::NOT_MOMENTUM,
ScrollSnapFlags::IntendedDirection |
ScrollSnapFlags::IntendedEndPosition);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::ScrollLine(bool aForward) {
nsIScrollableFrame* scrollFrame =
GetScrollableFrameToScroll(VerticalScrollDirection);
ScrollMode scrollMode = apz::GetScrollModeForOrigin(ScrollOrigin::Lines);
if (scrollFrame) {
nsRect scrollPort = scrollFrame->GetScrollPortRect();
nsSize lineSize = scrollFrame->GetLineScrollAmount();
int32_t lineCount = StaticPrefs::toolkit_scrollbox_verticalScrollDistance();
if (lineCount * lineSize.height > scrollPort.Height()) {
return ScrollPage(aForward);
}
scrollFrame->ScrollBy(
nsIntPoint(0, aForward ? lineCount : -lineCount), ScrollUnit::LINES,
scrollMode, nullptr, mozilla::ScrollOrigin::NotSpecified,
nsIScrollableFrame::NOT_MOMENTUM, ScrollSnapFlags::IntendedDirection);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::ScrollCharacter(bool aRight) {
nsIScrollableFrame* scrollFrame =
GetScrollableFrameToScroll(HorizontalScrollDirection);
ScrollMode scrollMode = apz::GetScrollModeForOrigin(ScrollOrigin::Lines);
if (scrollFrame) {
int32_t h = StaticPrefs::toolkit_scrollbox_horizontalScrollDistance();
scrollFrame->ScrollBy(
nsIntPoint(aRight ? h : -h, 0), ScrollUnit::LINES, scrollMode, nullptr,
mozilla::ScrollOrigin::NotSpecified, nsIScrollableFrame::NOT_MOMENTUM,
ScrollSnapFlags::IntendedDirection);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::CompleteScroll(bool aForward) {
nsIScrollableFrame* scrollFrame =
GetScrollableFrameToScroll(VerticalScrollDirection);
ScrollMode scrollMode = apz::GetScrollModeForOrigin(ScrollOrigin::Other);
if (scrollFrame) {
scrollFrame->ScrollBy(
nsIntPoint(0, aForward ? 1 : -1), ScrollUnit::WHOLE, scrollMode,
nullptr, mozilla::ScrollOrigin::NotSpecified,
nsIScrollableFrame::NOT_MOMENTUM, ScrollSnapFlags::IntendedEndPosition);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::CompleteMove(bool aForward, bool aExtend) {
// Beware! This may flush notifications via synchronous
// ScrollSelectionIntoView.
RefPtr<nsFrameSelection> frameSelection = mSelection;
nsIContent* limiter = frameSelection->GetAncestorLimiter();
nsIFrame* frame = limiter ? limiter->GetPrimaryFrame()
: FrameConstructor()->GetRootElementFrame();
if (!frame) return NS_ERROR_FAILURE;
nsIFrame::CaretPosition pos = frame->GetExtremeCaretPosition(!aForward);
const nsFrameSelection::FocusMode focusMode =
aExtend ? nsFrameSelection::FocusMode::kExtendSelection
: nsFrameSelection::FocusMode::kCollapseToNewPoint;
frameSelection->HandleClick(
MOZ_KnownLive(pos.mResultContent) /* bug 1636889 */, pos.mContentOffset,
pos.mContentOffset, focusMode,
aForward ? CaretAssociationHint::After : CaretAssociationHint::Before);
if (limiter) {
// HandleClick resets ancestorLimiter, so set it again.
frameSelection->SetAncestorLimiter(limiter);
}
// After ScrollSelectionIntoView(), the pending notifications might be
// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
return ScrollSelectionIntoView(
nsISelectionController::SELECTION_NORMAL,
nsISelectionController::SELECTION_FOCUS_REGION,
nsISelectionController::SCROLL_SYNCHRONOUS |
nsISelectionController::SCROLL_FOR_CARET_MOVE);
}
// end implementations nsISelectionController
nsIFrame* PresShell::GetRootScrollFrame() const {
if (!mFrameConstructor) {
return nullptr;
}
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
// Ensure root frame is a viewport frame
if (!rootFrame || !rootFrame->IsViewportFrame()) {
return nullptr;
}
nsIFrame* theFrame = rootFrame->PrincipalChildList().FirstChild();
if (!theFrame || !theFrame->IsScrollFrame()) {
return nullptr;
}
return theFrame;
}
nsIScrollableFrame* PresShell::GetRootScrollFrameAsScrollable() const {
nsIFrame* frame = GetRootScrollFrame();
if (!frame) {
return nullptr;
}
nsIScrollableFrame* scrollableFrame = do_QueryFrame(frame);
NS_ASSERTION(scrollableFrame,
"All scroll frames must implement nsIScrollableFrame");
return scrollableFrame;
}
nsPageSequenceFrame* PresShell::GetPageSequenceFrame() const {
return mFrameConstructor->GetPageSequenceFrame();
}
nsCanvasFrame* PresShell::GetCanvasFrame() const {
return mFrameConstructor->GetCanvasFrame();
}
void PresShell::RestoreRootScrollPosition() {
nsIScrollableFrame* scrollableFrame = GetRootScrollFrameAsScrollable();
if (scrollableFrame) {
scrollableFrame->ScrollToRestoredPosition();
}
}
void PresShell::MaybeReleaseCapturingContent() {
RefPtr<nsFrameSelection> frameSelection = FrameSelection();
if (frameSelection) {
frameSelection->SetDragState(false);
}
if (sCapturingContentInfo.mContent &&
sCapturingContentInfo.mContent->OwnerDoc() == mDocument) {
PresShell::ReleaseCapturingContent();
}
}
void PresShell::BeginLoad(Document* aDocument) {
mDocumentLoading = true;
gfxTextPerfMetrics* tp = nullptr;
if (mPresContext) {
tp = mPresContext->GetTextPerfMetrics();
}
bool shouldLog = MOZ_LOG_TEST(gLog, LogLevel::Debug);
if (shouldLog || tp) {
mLoadBegin = TimeStamp::Now();
}
if (shouldLog) {
nsIURI* uri = mDocument->GetDocumentURI();
MOZ_LOG(gLog, LogLevel::Debug,
("(presshell) %p load begin [%s]\n", this,
uri ? uri->GetSpecOrDefault().get() : ""));
}
}
void PresShell::EndLoad(Document* aDocument) {
MOZ_ASSERT(aDocument == mDocument, "Wrong document");
RestoreRootScrollPosition();
mDocumentLoading = false;
}
bool PresShell::IsLayoutFlushObserver() {
return GetPresContext()->RefreshDriver()->IsLayoutFlushObserver(this);
}
void PresShell::LoadComplete() {
gfxTextPerfMetrics* tp = nullptr;
if (mPresContext) {
tp = mPresContext->GetTextPerfMetrics();
}
// log load
bool shouldLog = MOZ_LOG_TEST(gLog, LogLevel::Debug);
if (shouldLog || tp) {
TimeDuration loadTime = TimeStamp::Now() - mLoadBegin;
nsIURI* uri = mDocument->GetDocumentURI();
nsAutoCString spec;
if (uri) {
spec = uri->GetSpecOrDefault();
}
if (shouldLog) {
MOZ_LOG(gLog, LogLevel::Debug,
("(presshell) %p load done time-ms: %9.2f [%s]\n", this,
loadTime.ToMilliseconds(), spec.get()));
}
if (tp) {
tp->Accumulate();
if (tp->cumulative.numChars > 0) {
LogTextPerfStats(tp, this, tp->cumulative, loadTime.ToMilliseconds(),
eLog_loaddone, spec.get());
}
}
}
}
#ifdef DEBUG
void PresShell::VerifyHasDirtyRootAncestor(nsIFrame* aFrame) {
// XXXbz due to bug 372769, can't actually assert anything here...
// XXX Since bug 372769 is now fixed, the assertion is being enabled in bug
// 1758104.
# if 0
// XXXbz shouldn't need this part; remove it once FrameNeedsReflow
// handles the root frame correctly.
if (!aFrame->GetParent()) {
return;
}
// Make sure that there is a reflow root ancestor of |aFrame| that's
// in mDirtyRoots already.
while (aFrame && aFrame->HasAnyStateBits(NS_FRAME_HAS_DIRTY_CHILDREN)) {
if ((aFrame->HasAnyStateBits(NS_FRAME_REFLOW_ROOT |
NS_FRAME_DYNAMIC_REFLOW_ROOT) ||
!aFrame->GetParent()) &&
mDirtyRoots.Contains(aFrame)) {
return;
}
aFrame = aFrame->GetParent();
}
MOZ_ASSERT_UNREACHABLE(
"Frame has dirty bits set but isn't scheduled to be "
"reflowed?");
# endif
}
#endif
void PresShell::PostPendingScrollAnchorSelection(
mozilla::layout::ScrollAnchorContainer* aContainer) {
mPendingScrollAnchorSelection.Insert(aContainer->ScrollableFrame());
}
void PresShell::FlushPendingScrollAnchorSelections() {
for (nsIScrollableFrame* scroll : mPendingScrollAnchorSelection) {
scroll->Anchor()->SelectAnchor();
}
mPendingScrollAnchorSelection.Clear();
}
void PresShell::PostPendingScrollAnchorAdjustment(
ScrollAnchorContainer* aContainer) {
mPendingScrollAnchorAdjustment.Insert(aContainer->ScrollableFrame());
}
void PresShell::FlushPendingScrollAnchorAdjustments() {
for (nsIScrollableFrame* scroll : mPendingScrollAnchorAdjustment) {
scroll->Anchor()->ApplyAdjustments();
}
mPendingScrollAnchorAdjustment.Clear();
}
void PresShell::PostPendingScrollResnap(nsIScrollableFrame* aScrollableFrame) {
mPendingScrollResnap.Insert(aScrollableFrame);
}
void PresShell::FlushPendingScrollResnap() {
for (nsIScrollableFrame* scrollableFrame : mPendingScrollResnap) {
scrollableFrame->TryResnap();
}
mPendingScrollResnap.Clear();
}
void PresShell::FrameNeedsReflow(nsIFrame* aFrame,
IntrinsicDirty aIntrinsicDirty,
nsFrameState aBitToAdd,
ReflowRootHandling aRootHandling) {
MOZ_ASSERT(aBitToAdd == NS_FRAME_IS_DIRTY ||
aBitToAdd == NS_FRAME_HAS_DIRTY_CHILDREN || !aBitToAdd,
"Unexpected bits being added");
// FIXME bug 478135
NS_ASSERTION(
aIntrinsicDirty != IntrinsicDirty::FrameAncestorsAndDescendants ||
aBitToAdd != NS_FRAME_HAS_DIRTY_CHILDREN,
"bits don't correspond to style change reason");
// FIXME bug 457400
NS_ASSERTION(!mIsReflowing, "can't mark frame dirty during reflow");
// If we've not yet done the initial reflow, then don't bother
// enqueuing a reflow command yet.
if (!mDidInitialize) return;
// If we're already destroying, don't bother with this either.
if (mIsDestroying) return;
#ifdef DEBUG
// printf("gShellCounter: %d\n", gShellCounter++);
if (mInVerifyReflow) return;
if (VerifyReflowFlags::NoisyCommands & gVerifyReflowFlags) {
printf("\nPresShell@%p: frame %p needs reflow\n", (void*)this,
(void*)aFrame);
if (VerifyReflowFlags::ReallyNoisyCommands & gVerifyReflowFlags) {
printf("Current content model:\n");
Element* rootElement = mDocument->GetRootElement();
if (rootElement) {
rootElement->List(stdout, 0);
}
}
}
#endif
AutoTArray<nsIFrame*, 4> subtrees;
subtrees.AppendElement(aFrame);
do {
nsIFrame* subtreeRoot = subtrees.PopLastElement();
// Grab |wasDirty| now so we can go ahead and update the bits on
// subtreeRoot.
bool wasDirty = subtreeRoot->IsSubtreeDirty();
subtreeRoot->AddStateBits(aBitToAdd);
// Determine whether we need to keep looking for the next ancestor
// reflow root if subtreeRoot itself is a reflow root.
bool targetNeedsReflowFromParent;
switch (aRootHandling) {
case ReflowRootHandling::PositionOrSizeChange:
targetNeedsReflowFromParent = true;
break;
case ReflowRootHandling::NoPositionOrSizeChange:
targetNeedsReflowFromParent = false;
break;
case ReflowRootHandling::InferFromBitToAdd:
targetNeedsReflowFromParent = (aBitToAdd == NS_FRAME_IS_DIRTY);
break;
}
auto FrameIsReflowRoot = [](const nsIFrame* aFrame) {
return aFrame->HasAnyStateBits(NS_FRAME_REFLOW_ROOT |
NS_FRAME_DYNAMIC_REFLOW_ROOT);
};
auto CanStopClearingAncestorIntrinsics = [&](const nsIFrame* aFrame) {
return FrameIsReflowRoot(aFrame) && aFrame != subtreeRoot;
};
auto IsReflowBoundary = [&](const nsIFrame* aFrame) {
return FrameIsReflowRoot(aFrame) &&
(aFrame != subtreeRoot || !targetNeedsReflowFromParent);
};
// Mark the intrinsic widths as dirty on the frame, all of its ancestors,
// and all of its descendants, if needed:
if (aIntrinsicDirty != IntrinsicDirty::None) {
// Mark argument and all ancestors dirty. (Unless we hit a reflow root
// that should contain the reflow.
for (nsIFrame* a = subtreeRoot;
a && !CanStopClearingAncestorIntrinsics(a); a = a->GetParent()) {
a->MarkIntrinsicISizesDirty();
if (a->IsAbsolutelyPositioned()) {
// If we get here, 'a' is abspos, so its subtree's intrinsic sizing
// has no effect on its ancestors' intrinsic sizing. So, don't loop
// upwards any further.
break;
}
}
}
const bool frameAncestorAndDescendantISizesDirty =
(aIntrinsicDirty == IntrinsicDirty::FrameAncestorsAndDescendants);
const bool dirty = (aBitToAdd == NS_FRAME_IS_DIRTY);
if (frameAncestorAndDescendantISizesDirty || dirty) {
// Mark all descendants dirty (using an nsTArray stack rather than
// recursion).
// Note that ReflowInput::InitResizeFlags has some similar
// code; see comments there for how and why it differs.
AutoTArray<nsIFrame*, 32> stack;
stack.AppendElement(subtreeRoot);
do {
nsIFrame* f = stack.PopLastElement();
if (frameAncestorAndDescendantISizesDirty && f->IsPlaceholderFrame()) {
// Call `GetOutOfFlowFrame` directly because we can get here from
// frame destruction and the placeholder might be already torn down.
if (nsIFrame* oof =
static_cast<nsPlaceholderFrame*>(f)->GetOutOfFlowFrame()) {
if (!nsLayoutUtils::IsProperAncestorFrame(subtreeRoot, oof)) {
// We have another distinct subtree we need to mark.
subtrees.AppendElement(oof);
}
}
}
for (const auto& childList : f->ChildLists()) {
for (nsIFrame* kid : childList.mList) {
if (frameAncestorAndDescendantISizesDirty) {
kid->MarkIntrinsicISizesDirty();
}
if (dirty) {
kid->AddStateBits(NS_FRAME_IS_DIRTY);
}
stack.AppendElement(kid);
}
}
} while (stack.Length() != 0);
}
// Skip setting dirty bits up the tree if we weren't given a bit to add.
if (!aBitToAdd) {
continue;
}
// Set NS_FRAME_HAS_DIRTY_CHILDREN bits (via nsIFrame::ChildIsDirty)
// up the tree until we reach either a frame that's already dirty or
// a reflow root.
nsIFrame* f = subtreeRoot;
for (;;) {
if (IsReflowBoundary(f) || !f->GetParent()) {
// we've hit a reflow root or the root frame
if (!wasDirty) {
mDirtyRoots.Add(f);
SetNeedLayoutFlush();
}
#ifdef DEBUG
else {
VerifyHasDirtyRootAncestor(f);
}
#endif
break;
}
nsIFrame* child = f;
f = f->GetParent();
wasDirty = f->IsSubtreeDirty();
f->ChildIsDirty(child);
NS_ASSERTION(f->HasAnyStateBits(NS_FRAME_HAS_DIRTY_CHILDREN),
"ChildIsDirty didn't do its job");
if (wasDirty) {
// This frame was already marked dirty.
#ifdef DEBUG
VerifyHasDirtyRootAncestor(f);
#endif
break;
}
}
} while (subtrees.Length() != 0);
MaybeScheduleReflow();
}
void PresShell::FrameNeedsToContinueReflow(nsIFrame* aFrame) {
NS_ASSERTION(mIsReflowing, "Must be in reflow when marking path dirty.");
MOZ_ASSERT(mCurrentReflowRoot, "Must have a current reflow root here");
NS_ASSERTION(
aFrame == mCurrentReflowRoot ||
nsLayoutUtils::IsProperAncestorFrame(mCurrentReflowRoot, aFrame),
"Frame passed in is not the descendant of mCurrentReflowRoot");
NS_ASSERTION(aFrame->HasAnyStateBits(NS_FRAME_IN_REFLOW),
"Frame passed in not in reflow?");
mFramesToDirty.Insert(aFrame);
}
already_AddRefed<nsIContent> PresShell::GetContentForScrolling() const {
if (nsCOMPtr<nsIContent> focused = GetFocusedContentInOurWindow()) {
return focused.forget();
}
return GetSelectedContentForScrolling();
}
already_AddRefed<nsIContent> PresShell::GetSelectedContentForScrolling() const {
nsCOMPtr<nsIContent> selectedContent;
if (mSelection) {
Selection* domSelection = mSelection->GetSelection(SelectionType::eNormal);
if (domSelection) {
selectedContent =
nsIContent::FromNodeOrNull(domSelection->GetFocusNode());
}
}
return selectedContent.forget();
}
nsIScrollableFrame* PresShell::GetScrollableFrameToScrollForContent(
nsIContent* aContent, ScrollDirections aDirections) {
nsIScrollableFrame* scrollFrame = nullptr;
if (aContent) {
nsIFrame* startFrame = aContent->GetPrimaryFrame();
if (startFrame) {
scrollFrame = startFrame->GetScrollTargetFrame();
if (scrollFrame) {
startFrame = scrollFrame->GetScrolledFrame();
}
scrollFrame = nsLayoutUtils::GetNearestScrollableFrameForDirection(
startFrame, aDirections);
}
}
if (!scrollFrame) {
scrollFrame = GetRootScrollFrameAsScrollable();
if (!scrollFrame || !scrollFrame->GetScrolledFrame()) {
return nullptr;
}
scrollFrame = nsLayoutUtils::GetNearestScrollableFrameForDirection(
scrollFrame->GetScrolledFrame(), aDirections);
}
return scrollFrame;
}
nsIScrollableFrame* PresShell::GetScrollableFrameToScroll(
ScrollDirections aDirections) {
nsCOMPtr<nsIContent> content = GetContentForScrolling();
return GetScrollableFrameToScrollForContent(content.get(), aDirections);
}
void PresShell::CancelAllPendingReflows() {
mDirtyRoots.Clear();
if (mObservingLayoutFlushes) {
GetPresContext()->RefreshDriver()->RemoveLayoutFlushObserver(this);
mObservingLayoutFlushes = false;
}
ASSERT_REFLOW_SCHEDULED_STATE();
}
static bool DestroyFramesAndStyleDataFor(
Element* aElement, nsPresContext& aPresContext,
RestyleManager::IncludeRoot aIncludeRoot) {
bool didReconstruct =
aPresContext.FrameConstructor()->DestroyFramesFor(aElement);
RestyleManager::ClearServoDataFromSubtree(aElement, aIncludeRoot);
return didReconstruct;
}
void PresShell::SlotAssignmentWillChange(Element& aElement,
HTMLSlotElement* aOldSlot,
HTMLSlotElement* aNewSlot) {
MOZ_ASSERT(aOldSlot != aNewSlot);
if (MOZ_UNLIKELY(!mDidInitialize)) {
return;
}
// If the old slot is about to become empty and show fallback, let layout know
// that it needs to do work.
if (aOldSlot && aOldSlot->AssignedNodes().Length() == 1 &&
aOldSlot->HasChildren()) {
DestroyFramesForAndRestyle(aOldSlot);
}
// Ensure the new element starts off clean.
DestroyFramesAndStyleDataFor(&aElement, *mPresContext,
RestyleManager::IncludeRoot::Yes);
if (aNewSlot) {
// If the new slot will stop showing fallback content, we need to reframe it
// altogether.
if (aNewSlot->AssignedNodes().IsEmpty() && aNewSlot->HasChildren()) {
DestroyFramesForAndRestyle(aNewSlot);
// Otherwise we just care about the element, but we need to ensure that
// something takes care of traversing to the relevant slot, if needed.
} else if (aNewSlot->HasServoData() &&
!Servo_Element_IsDisplayNone(aNewSlot)) {
// Set the reframe bits...
aNewSlot->NoteDescendantsNeedFramesForServo();
aElement.SetFlags(NODE_NEEDS_FRAME);
// Now the style dirty bits. Note that we can't just do
// aElement.NoteDirtyForServo(), because the new slot is not setup yet.
aNewSlot->SetHasDirtyDescendantsForServo();
aNewSlot->NoteDirtySubtreeForServo();
}
}
}
#ifdef DEBUG
static void AssertNoFramesOrStyleDataInDescendants(Element& aElement) {
for (nsINode* node : ShadowIncludingTreeIterator(aElement)) {
nsIContent* c = nsIContent::FromNode(node);
if (c == &aElement) {
continue;
}
// FIXME(emilio): The <area> check is needed because of bug 135040.
MOZ_ASSERT(!c->GetPrimaryFrame() || c->IsHTMLElement(nsGkAtoms::area));
MOZ_ASSERT(!c->IsElement() || !c->AsElement()->HasServoData());
}
}
#endif
void PresShell::DestroyFramesForAndRestyle(Element* aElement) {
#ifdef DEBUG
auto postCondition = MakeScopeExit([&]() {
MOZ_ASSERT(!aElement->GetPrimaryFrame());
AssertNoFramesOrStyleDataInDescendants(*aElement);
});
#endif
MOZ_ASSERT(aElement);
if (!aElement->HasServoData()) {
// Nothing to do here, the element already is out of the flat tree or is not
// styled.
return;
}
// Mark ourselves as not safe to flush while we're doing frame destruction.
nsAutoScriptBlocker scriptBlocker;
++mChangeNestCount;
const bool didReconstruct = FrameConstructor()->DestroyFramesFor(aElement);
// Clear the style data from all the flattened tree descendants, but _not_
// from us, since otherwise we wouldn't see the reframe.
RestyleManager::ClearServoDataFromSubtree(aElement,
RestyleManager::IncludeRoot::No);
auto changeHint =
didReconstruct ? nsChangeHint(0) : nsChangeHint_ReconstructFrame;
mPresContext->RestyleManager()->PostRestyleEvent(
aElement, RestyleHint::RestyleSubtree(), changeHint);
--mChangeNestCount;
}
void PresShell::ShadowRootWillBeAttached(Element& aElement) {
#ifdef DEBUG
auto postCondition = MakeScopeExit(
[&]() { AssertNoFramesOrStyleDataInDescendants(aElement); });
#endif
if (!aElement.HasServoData()) {
// Nothing to do here, the element already is out of the flat tree or is not
// styled.
return;
}
if (!aElement.HasChildren()) {
// The element has no children, just avoid the work.
return;
}
// Mark ourselves as not safe to flush while we're doing frame destruction.
nsAutoScriptBlocker scriptBlocker;
++mChangeNestCount;
// NOTE(emilio): We use FlattenedChildIterator intentionally here (rather than
// StyleChildrenIterator), since we don't want to remove ::before / ::after
// content.
FlattenedChildIterator iter(&aElement);
nsCSSFrameConstructor* fc = FrameConstructor();
for (nsIContent* c = iter.GetNextChild(); c; c = iter.GetNextChild()) {
fc->DestroyFramesFor(c);
if (c->IsElement()) {
RestyleManager::ClearServoDataFromSubtree(c->AsElement());
}
}
#ifdef ACCESSIBILITY
if (nsAccessibilityService* accService = GetAccService()) {
accService->ScheduleAccessibilitySubtreeUpdate(this, &aElement);
}
#endif
--mChangeNestCount;
}
void PresShell::PostRecreateFramesFor(Element* aElement) {
if (MOZ_UNLIKELY(!mDidInitialize)) {
// Nothing to do here. In fact, if we proceed and aElement is the root, we
// will crash.
return;
}
mPresContext->RestyleManager()->PostRestyleEvent(
aElement, RestyleHint{0}, nsChangeHint_ReconstructFrame);
}
void PresShell::RestyleForAnimation(Element* aElement, RestyleHint aHint) {
// Now that we no longer have separate non-animation and animation
// restyles, this method having a distinct identity is less important,
// but it still seems useful to offer as a "more public" API and as a
// checkpoint for these restyles to go through.
mPresContext->RestyleManager()->PostRestyleEvent(aElement, aHint,
nsChangeHint(0));
}
void PresShell::SetForwardingContainer(const WeakPtr<nsDocShell>& aContainer) {
mForwardingContainer = aContainer;
}
void PresShell::ClearFrameRefs(nsIFrame* aFrame) {
mPresContext->EventStateManager()->ClearFrameRefs(aFrame);
AutoWeakFrame* weakFrame = mAutoWeakFrames;
while (weakFrame) {
AutoWeakFrame* prev = weakFrame->GetPreviousWeakFrame();
if (weakFrame->GetFrame() == aFrame) {
// This removes weakFrame from mAutoWeakFrames.
weakFrame->Clear(this);
}
weakFrame = prev;
}
AutoTArray<WeakFrame*, 4> toRemove;
for (WeakFrame* weakFrame : mWeakFrames) {
if (weakFrame->GetFrame() == aFrame) {
toRemove.AppendElement(weakFrame);
}
}
for (WeakFrame* weakFrame : toRemove) {
weakFrame->Clear(this);
}
}
UniquePtr<gfxContext> PresShell::CreateReferenceRenderingContext() {
if (mPresContext->IsScreen()) {
return gfxContext::CreateOrNull(
gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget().get());
}
// We assume the devCtx has positive width and height for this call.
// However, width and height, may be outside of the reasonable range
// so rc may still be null.
nsDeviceContext* devCtx = mPresContext->DeviceContext();
return devCtx->CreateReferenceRenderingContext();
}
// https://html.spec.whatwg.org/#scroll-to-the-fragment-identifier
nsresult PresShell::GoToAnchor(const nsAString& aAnchorName, bool aScroll,
ScrollFlags aAdditionalScrollFlags) {
if (!mDocument) {
return NS_ERROR_FAILURE;
}
const Element* root = mDocument->GetRootElement();
if (root && root->IsSVGElement(nsGkAtoms::svg)) {
// We need to execute this even if there is an empty anchor name
// so that any existing SVG fragment identifier effect is removed
if (SVGFragmentIdentifier::ProcessFragmentIdentifier(mDocument,
aAnchorName)) {
return NS_OK;
}
}
// Hold a reference to the ESM in case event dispatch tears us down.
RefPtr<EventStateManager> esm = mPresContext->EventStateManager();
// 1. If there is no indicated part of the document, set the Document's target
// element to null.
//
// FIXME(emilio): Per spec empty fragment string should take the same
// code-path as "top"!
if (aAnchorName.IsEmpty()) {
NS_ASSERTION(!aScroll, "can't scroll to empty anchor name");
esm->SetContentState(nullptr, ElementState::URLTARGET);
return NS_OK;
}
// 2. If the indicated part of the document is the top of the document,
// then:
// (handled below when `target` is null, and anchor is `top`)
// 3.1. Let target be element that is the indicated part of the document.
//
// https://html.spec.whatwg.org/#target-element
// https://html.spec.whatwg.org/#find-a-potential-indicated-element
RefPtr<Element> target =
nsContentUtils::GetTargetElement(mDocument, aAnchorName);
// 1. If there is no indicated part of the document, set the Document's
// target element to null.
// 2.1. Set the Document's target element to null.
// 3.2. Set the Document's target element to target.
esm->SetContentState(target, ElementState::URLTARGET);
// TODO: Spec probably needs a section to account for this.
if (nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable()) {
if (rootScroll->DidHistoryRestore()) {
// Scroll position restored from history trumps scrolling to anchor.
aScroll = false;
rootScroll->ClearDidHistoryRestore();
}
}
if (target) {
if (aScroll) {
// 3.3. TODO: Run the ancestor details revealing algorithm on target.
// 3.4. Scroll target into view, with behavior set to "auto", block set to
// "start", and inline set to "nearest".
// FIXME(emilio): Not all callers pass ScrollSmoothAuto (but we use auto
// smooth scroll for `top` regardless below, so maybe they should!).
ScrollingInteractionContext scrollToAnchorContext(true);
MOZ_TRY(ScrollContentIntoView(
target, ScrollAxis(WhereToScroll::Start, WhenToScroll::Always),
ScrollAxis(),
ScrollFlags::AnchorScrollFlags | aAdditionalScrollFlags));
if (nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable()) {
mLastAnchorScrolledTo = target;
mLastAnchorScrollPositionY = rootScroll->GetScrollPosition().y;
}
}
{
// 3.6. Move the sequential focus navigation starting point to target.
//
// Move the caret to the anchor. That way tabbing will start from the new
// location.
//
// TODO(emilio): Do we want to do this even if aScroll is false?
//
// NOTE: Intentionally out of order for now with the focus steps, see
// https://github.com/whatwg/html/issues/7759
RefPtr<nsRange> jumpToRange = nsRange::Create(mDocument);
nsCOMPtr<nsIContent> nodeToSelect = target.get();
while (nodeToSelect->GetFirstChild()) {
nodeToSelect = nodeToSelect->GetFirstChild();
}
jumpToRange->SelectNodeContents(*nodeToSelect, IgnoreErrors());
if (RefPtr sel = mSelection->GetSelection(SelectionType::eNormal)) {
sel->RemoveAllRanges(IgnoreErrors());
sel->AddRangeAndSelectFramesAndNotifyListeners(*jumpToRange,
IgnoreErrors());
if (!StaticPrefs::layout_selectanchor()) {
// Use a caret (collapsed selection) at the start of the anchor.
sel->CollapseToStart(IgnoreErrors());
}
}
}
// 3.5. Run the focusing steps for target, with the Document's viewport as
// the fallback target.
//
// Note that ScrollContentIntoView flushes, so we don't need to do that
// again here. We also don't need to scroll again either.
//
// We intentionally focus the target only when aScroll is true, we need to
// sort out if the spec needs to differentiate these cases. When aScroll is
// false we still clear the focus unconditionally, that's legacy behavior,
// maybe we shouldn't do it.
//
// TODO(emilio): Do we really want to clear the focus even if aScroll is
// false?
const bool shouldFocusTarget = [&] {
if (!aScroll) {
return false;
}
nsIFrame* targetFrame = target->GetPrimaryFrame();
return targetFrame && targetFrame->IsFocusable();
}();
if (shouldFocusTarget) {
FocusOptions options;
options.mPreventScroll = true;
target->Focus(options, CallerType::NonSystem, IgnoreErrors());
} else if (RefPtr<nsIFocusManager> fm = nsFocusManager::GetFocusManager()) {
if (nsPIDOMWindowOuter* win = mDocument->GetWindow()) {
// Now focus the document itself if focus is on an element within it.
nsCOMPtr<mozIDOMWindowProxy> focusedWindow;
fm->GetFocusedWindow(getter_AddRefs(focusedWindow));
if (SameCOMIdentity(win, focusedWindow)) {
fm->ClearFocus(focusedWindow);
}
}
}
// If the target is an animation element, activate the animation
if (auto* animationElement = SVGAnimationElement::FromNode(target.get())) {
animationElement->ActivateByHyperlink();
}
#ifdef ACCESSIBILITY
if (nsAccessibilityService* accService = GetAccService()) {
accService->NotifyOfAnchorJumpTo(target);
}
#endif
} else if (nsContentUtils::EqualsIgnoreASCIICase(aAnchorName, u"top"_ns)) {
// 2.2. Scroll to the beginning of the document for the Document.
nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable();
// Check |aScroll| after setting |rv| so we set |rv| to the same
// thing whether or not |aScroll| is true.
if (aScroll && sf) {
ScrollMode scrollMode =
sf->IsSmoothScroll() ? ScrollMode::SmoothMsd : ScrollMode::Instant;
// Scroll to the top of the page
sf->ScrollTo(nsPoint(0, 0), scrollMode);
}
} else {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult PresShell::ScrollToAnchor() {
nsCOMPtr<nsIContent> lastAnchor = std::move(mLastAnchorScrolledTo);
if (!lastAnchor) {
return NS_OK;
}
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
if (!rootScroll ||
mLastAnchorScrollPositionY != rootScroll->GetScrollPosition().y) {
return NS_OK;
}
return ScrollContentIntoView(
lastAnchor, ScrollAxis(WhereToScroll::Start, WhenToScroll::Always),
ScrollAxis(), ScrollFlags::AnchorScrollFlags);
}
bool PresShell::HighlightAndGoToTextFragment(bool aScrollToTextFragment) {
MOZ_ASSERT(mDocument);
if (!StaticPrefs::dom_text_fragments_enabled()) {
return false;
}
const RefPtr<FragmentDirective> fragmentDirective =
mDocument->FragmentDirective();
nsTArray<RefPtr<nsRange>> textDirectiveRanges =
fragmentDirective->FindTextFragmentsInDocument();
if (textDirectiveRanges.IsEmpty()) {
return false;
}
const RefPtr<Selection> targetTextSelection =
GetCurrentSelection(SelectionType::eTargetText);
if (!targetTextSelection) {
return false;
}
for (RefPtr<nsRange> range : textDirectiveRanges) {
targetTextSelection->AddRangeAndSelectFramesAndNotifyListeners(
*range, IgnoreErrors());
}
if (!aScrollToTextFragment) {
return false;
}
// Scroll the last text directive into view.
nsRange* lastRange = textDirectiveRanges.LastElement();
MOZ_ASSERT(lastRange);
if (RefPtr<nsIContent> lastRangeStartContent =
nsIContent::FromNode(lastRange->GetStartContainer())) {
return ScrollContentIntoView(
lastRangeStartContent,
ScrollAxis(WhereToScroll::Center, WhenToScroll::Always),
ScrollAxis(), ScrollFlags::AnchorScrollFlags) == NS_OK;
}
return false;
}
/*
* Helper (per-continuation) for ScrollContentIntoView.
*
* @param aContainerFrame [in] the frame which aRect is relative to
* @param aFrame [in] Frame whose bounds should be unioned
* @param aUseWholeLineHeightForInlines [in] if true, then for inline frames
* we should include the top of the line in the added rectangle
* @param aRect [inout] rect into which its bounds should be unioned
* @param aHaveRect [inout] whether aRect contains data yet
* @param aPrevBlock [inout] the block aLines is a line iterator for
* @param aLines [inout] the line iterator we're using
* @param aCurLine [inout] the line to start looking from in this iterator
*/
static void AccumulateFrameBounds(nsIFrame* aContainerFrame, nsIFrame* aFrame,
bool aUseWholeLineHeightForInlines,
nsRect& aRect, bool& aHaveRect,
nsIFrame*& aPrevBlock,
nsILineIterator*& aLines, int32_t& aCurLine) {
nsIFrame* frame = aFrame;
nsRect frameBounds = nsRect(nsPoint(0, 0), aFrame->GetSize());
// If this is an inline frame and either the bounds height is 0 (quirks
// layout model) or aUseWholeLineHeightForInlines is set, we need to
// change the top of the bounds to include the whole line.
if (frameBounds.height == 0 || aUseWholeLineHeightForInlines) {
nsIFrame* prevFrame = aFrame;
nsIFrame* f = aFrame;
while (f && f->IsLineParticipant() && !f->IsTransformed() &&
!f->IsAbsPosContainingBlock()) {
prevFrame = f;
f = prevFrame->GetParent();
}
if (f != aFrame && f && f->IsBlockFrame()) {
// find the line containing aFrame and increase the top of |offset|.
if (f != aPrevBlock) {
aLines = f->GetLineIterator();
aPrevBlock = f;
aCurLine = 0;
}
if (aLines) {
int32_t index = aLines->FindLineContaining(prevFrame, aCurLine);
if (index >= 0) {
auto line = aLines->GetLine(index).unwrap();
frameBounds += frame->GetOffsetTo(f);
frame = f;
if (line.mLineBounds.y < frameBounds.y) {
frameBounds.height = frameBounds.YMost() - line.mLineBounds.y;
frameBounds.y = line.mLineBounds.y;
}
}
}
}
}
nsRect transformedBounds = nsLayoutUtils::TransformFrameRectToAncestor(
frame, frameBounds, aContainerFrame);
if (aHaveRect) {
// We can't use nsRect::UnionRect since it drops empty rects on
// the floor, and we need to include them. (Thus we need
// aHaveRect to know when to drop the initial value on the floor.)
aRect = aRect.UnionEdges(transformedBounds);
} else {
aHaveRect = true;
aRect = transformedBounds;
}
}
static bool ComputeNeedToScroll(WhenToScroll aWhenToScroll, nscoord aLineSize,
nscoord aRectMin, nscoord aRectMax,
nscoord aViewMin, nscoord aViewMax) {
// See how the rect should be positioned in a given axis.
switch (aWhenToScroll) {
case WhenToScroll::Always:
// The caller wants the frame as visible as possible
return true;
case WhenToScroll::IfNotVisible:
if (aLineSize > (aRectMax - aRectMin)) {
// If the line size is greater than the size of the rect
// to scroll into view, do not use the line size to determine
// if we need to scroll.
aLineSize = 0;
}
// Scroll only if no part of the frame is visible in this view.
return aRectMax - aLineSize <= aViewMin ||
aRectMin + aLineSize >= aViewMax;
case WhenToScroll::IfNotFullyVisible:
// Scroll only if part of the frame is hidden and more can fit in view
return !(aRectMin >= aViewMin && aRectMax <= aViewMax) &&
std::min(aViewMax, aRectMax) - std::max(aRectMin, aViewMin) <
aViewMax - aViewMin;
}
return false;
}
static nscoord ComputeWhereToScroll(WhereToScroll aWhereToScroll,
nscoord aOriginalCoord, nscoord aRectMin,
nscoord aRectMax, nscoord aViewMin,
nscoord aViewMax, nscoord* aRangeMin,
nscoord* aRangeMax) {
nscoord resultCoord = aOriginalCoord;
nscoord scrollPortLength = aViewMax - aViewMin;
if (!aWhereToScroll.mPercentage) {
// Scroll the minimum amount necessary to show as much as possible of the
// frame. If the frame is too large, don't hide any initially visible part
// of it.
nscoord min = std::min(aRectMin, aRectMax - scrollPortLength);
nscoord max = std::max(aRectMin, aRectMax - scrollPortLength);
resultCoord = std::min(std::max(aOriginalCoord, min), max);
} else {
float percent = aWhereToScroll.mPercentage.value() / 100.0f;
nscoord frameAlignCoord =
NSToCoordRound(aRectMin + (aRectMax - aRectMin) * percent);
resultCoord = NSToCoordRound(frameAlignCoord - scrollPortLength * percent);
}
// Force the scroll range to extend to include resultCoord.
*aRangeMin = std::min(resultCoord, aRectMax - scrollPortLength);
*aRangeMax = std::max(resultCoord, aRectMin);
return resultCoord;
}
static WhereToScroll GetApplicableWhereToScroll(
const nsIScrollableFrame* aFrameAsScrollable,
const nsIFrame* aScrollableFrame, const nsIFrame* aTarget,
ScrollDirection aScrollDirection, WhereToScroll aOriginal) {
MOZ_ASSERT(do_QueryFrame(aFrameAsScrollable) == aScrollableFrame);
if (aTarget == aScrollableFrame) {
return aOriginal;
}
StyleScrollSnapAlignKeyword align =
aScrollDirection == ScrollDirection::eHorizontal
? aFrameAsScrollable->GetScrollSnapAlignFor(aTarget).first
: aFrameAsScrollable->GetScrollSnapAlignFor(aTarget).second;
switch (align) {
case StyleScrollSnapAlignKeyword::None:
return aOriginal;
case StyleScrollSnapAlignKeyword::Start:
return WhereToScroll::Start;
case StyleScrollSnapAlignKeyword::Center:
return WhereToScroll::Center;
case StyleScrollSnapAlignKeyword::End:
return WhereToScroll::End;
}
return aOriginal;
}
/**
* This function takes a scrollable frame, a rect in the coordinate system
* of the scrolled frame, and a desired percentage-based scroll
* position and attempts to scroll the rect to that position in the
* visual viewport.
*
* This needs to work even if aRect has a width or height of zero.
*/
static void ScrollToShowRect(nsIScrollableFrame* aFrameAsScrollable,
const nsIFrame* aScrollableFrame,
const nsIFrame* aTarget, const nsRect& aRect,
const Sides aScrollPaddingSkipSides,
const nsMargin& aMargin, ScrollAxis aVertical,
ScrollAxis aHorizontal, ScrollFlags aScrollFlags) {
nsPoint scrollPt = aFrameAsScrollable->GetVisualViewportOffset();
const nsPoint originalScrollPt = scrollPt;
const nsRect visibleRect(scrollPt,
aFrameAsScrollable->GetVisualViewportSize());
const nsMargin padding = [&] {
nsMargin p = aFrameAsScrollable->GetScrollPadding();
p.ApplySkipSides(aScrollPaddingSkipSides);
return p + aMargin;
}();
const nsRect rectToScrollIntoView = [&] {
nsRect r(aRect);
r.Inflate(padding);
return r.Intersect(aFrameAsScrollable->GetScrolledRect());
}();
nsSize lineSize;
// Don't call GetLineScrollAmount unless we actually need it. Not only
// does this save time, but it's not safe to call GetLineScrollAmount
// during reflow (because it depends on font size inflation and doesn't
// use the in-reflow-safe font-size inflation path). If we did call it,
// it would assert and possible give the wrong result.
if (aVertical.mWhenToScroll == WhenToScroll::IfNotVisible ||
aHorizontal.mWhenToScroll == WhenToScroll::IfNotVisible) {
lineSize = aFrameAsScrollable->GetLineScrollAmount();
}
ScrollStyles ss = aFrameAsScrollable->GetScrollStyles();
nsRect allowedRange(scrollPt, nsSize(0, 0));
ScrollDirections directions =
aFrameAsScrollable->GetAvailableScrollingDirections();
if (((aScrollFlags & ScrollFlags::ScrollOverflowHidden) ||
ss.mVertical != StyleOverflow::Hidden) &&
(!aVertical.mOnlyIfPerceivedScrollableDirection ||
(directions.contains(ScrollDirection::eVertical)))) {
if (ComputeNeedToScroll(aVertical.mWhenToScroll, lineSize.height, aRect.y,
aRect.YMost(), visibleRect.y + padding.top,
visibleRect.YMost() - padding.bottom)) {
// If the scroll-snap-align on the frame is valid, we need to respect it.
WhereToScroll whereToScroll = GetApplicableWhereToScroll(
aFrameAsScrollable, aScrollableFrame, aTarget,
ScrollDirection::eVertical, aVertical.mWhereToScroll);
nscoord maxHeight;
scrollPt.y = ComputeWhereToScroll(
whereToScroll, scrollPt.y, rectToScrollIntoView.y,
rectToScrollIntoView.YMost(), visibleRect.y, visibleRect.YMost(),
&allowedRange.y, &maxHeight);
allowedRange.height = maxHeight - allowedRange.y;
}
}
if (((aScrollFlags & ScrollFlags::ScrollOverflowHidden) ||
ss.mHorizontal != StyleOverflow::Hidden) &&
(!aHorizontal.mOnlyIfPerceivedScrollableDirection ||
(directions.contains(ScrollDirection::eHorizontal)))) {
if (ComputeNeedToScroll(aHorizontal.mWhenToScroll, lineSize.width, aRect.x,
aRect.XMost(), visibleRect.x + padding.left,
visibleRect.XMost() - padding.right)) {
// If the scroll-snap-align on the frame is valid, we need to respect it.
WhereToScroll whereToScroll = GetApplicableWhereToScroll(
aFrameAsScrollable, aScrollableFrame, aTarget,
ScrollDirection::eHorizontal, aHorizontal.mWhereToScroll);
nscoord maxWidth;
scrollPt.x = ComputeWhereToScroll(
whereToScroll, scrollPt.x, rectToScrollIntoView.x,
rectToScrollIntoView.XMost(), visibleRect.x, visibleRect.XMost(),
&allowedRange.x, &maxWidth);
allowedRange.width = maxWidth - allowedRange.x;
}
}
// If we don't need to scroll, then don't try since it might cancel
// a current smooth scroll operation.
if (scrollPt == originalScrollPt) {
return;
}
ScrollMode scrollMode = ScrollMode::Instant;
// Default to an instant scroll, but if the scroll behavior given is "auto"
// or "smooth", use that as the specified behavior. If the user has disabled
// smooth scrolls, a given mode of "auto" or "smooth" should not result in
// a smooth scroll.
ScrollBehavior behavior = ScrollBehavior::Instant;
if (aScrollFlags & ScrollFlags::ScrollSmooth) {
behavior = ScrollBehavior::Smooth;
} else if (aScrollFlags & ScrollFlags::ScrollSmoothAuto) {
behavior = ScrollBehavior::Auto;
}
bool smoothScroll = aFrameAsScrollable->IsSmoothScroll(behavior);
if (smoothScroll) {
scrollMode = ScrollMode::SmoothMsd;
}
nsIFrame* frame = do_QueryFrame(aFrameAsScrollable);
AutoWeakFrame weakFrame(frame);
aFrameAsScrollable->ScrollTo(scrollPt, scrollMode, &allowedRange,
ScrollSnapFlags::IntendedEndPosition,
aScrollFlags & ScrollFlags::TriggeredByScript
? ScrollTriggeredByScript::Yes
: ScrollTriggeredByScript::No);
if (!weakFrame.IsAlive()) {
return;
}
// If this is the RCD-RSF, also call ScrollToVisual() since we want to
// scroll the rect into view visually, and that may require scrolling
// the visual viewport in scenarios where there is not enough layout
// scroll range.
if (aFrameAsScrollable->IsRootScrollFrameOfDocument() &&
frame->PresContext()->IsRootContentDocumentCrossProcess()) {
frame->PresShell()->ScrollToVisual(scrollPt, FrameMetrics::eMainThread,
scrollMode);
}
}
nsresult PresShell::ScrollContentIntoView(nsIContent* aContent,
ScrollAxis aVertical,
ScrollAxis aHorizontal,
ScrollFlags aScrollFlags) {
NS_ENSURE_TRUE(aContent, NS_ERROR_NULL_POINTER);
RefPtr<Document> composedDoc = aContent->GetComposedDoc();
NS_ENSURE_STATE(composedDoc);
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
if (mContentToScrollTo) {
mContentToScrollTo->RemoveProperty(nsGkAtoms::scrolling);
}
mContentToScrollTo = aContent;
ScrollIntoViewData* data = new ScrollIntoViewData();
data->mContentScrollVAxis = aVertical;
data->mContentScrollHAxis = aHorizontal;
data->mContentToScrollToFlags = aScrollFlags;
if (NS_FAILED(mContentToScrollTo->SetProperty(
nsGkAtoms::scrolling, data,
nsINode::DeleteProperty<PresShell::ScrollIntoViewData>))) {
mContentToScrollTo = nullptr;
}
// If the target frame has an ancestor of a `content-visibility: auto`
// element ensure that it is laid out, so that the boundary rectangle is
// correct.
// Additionally, ensure that all ancestor elements with 'content-visibility:
// auto' are set to 'visible'. so that they are laid out as visible before
// scrolling, improving the accuracy of the scroll position, especially when
// the scroll target is within the overflow area. And here invoking
// 'SetTemporarilyVisibleForScrolledIntoViewDescendant' would make the
// intersection observer knows that it should generate entries for these
// c-v:auto ancestors, so that the content relevancy could be checked again
// after scrolling. https://drafts.csswg.org/css-contain-2/#cv-notes
bool reflowedForHiddenContent = false;
if (mContentToScrollTo) {
if (nsIFrame* frame = mContentToScrollTo->GetPrimaryFrame()) {
bool hasContentVisibilityAutoAncestor = false;
auto* ancestor = frame->GetClosestContentVisibilityAncestor(
nsIFrame::IncludeContentVisibility::Auto);
while (ancestor) {
if (auto* element = Element::FromNodeOrNull(ancestor->GetContent())) {
hasContentVisibilityAutoAncestor = true;
element->SetTemporarilyVisibleForScrolledIntoViewDescendant(true);
element->SetVisibleForContentVisibility(true);
}
ancestor = ancestor->GetClosestContentVisibilityAncestor(
nsIFrame::IncludeContentVisibility::Auto);
}
if (hasContentVisibilityAutoAncestor) {
UpdateHiddenContentInForcedLayout(frame);
// TODO: There might be the other already scheduled relevancy updates,
// other than caused be scrollIntoView.
UpdateContentRelevancyImmediately(ContentRelevancyReason::Visible);
reflowedForHiddenContent = ReflowForHiddenContentIfNeeded();
}
}
}
if (!reflowedForHiddenContent) {
// Flush layout and attempt to scroll in the process.
if (PresShell* presShell = composedDoc->GetPresShell()) {
presShell->SetNeedLayoutFlush();
}
composedDoc->FlushPendingNotifications(FlushType::InterruptibleLayout);
}
// If mContentToScrollTo is non-null, that means we interrupted the reflow
// (or suppressed it altogether because we're suppressing interruptible
// flushes right now) and won't necessarily get the position correct, but do
// a best-effort scroll here. The other option would be to do this inside
// FlushPendingNotifications, but I'm not sure the repeated scrolling that
// could trigger if reflows keep getting interrupted would be more desirable
// than a single best-effort scroll followed by one final scroll on the first
// completed reflow.
if (mContentToScrollTo) {
DoScrollContentIntoView();
}
return NS_OK;
}
static nsMargin GetScrollMargin(const nsIFrame* aFrame) {
MOZ_ASSERT(aFrame);
// If we're focusing something that can't be targeted by content, allow
// content to customize the margin.
//
// TODO: This is also a bit of an issue for delegated focus, see
// https://github.com/whatwg/html/issues/7033.
if (aFrame->GetContent() && aFrame->GetContent()->ChromeOnlyAccess()) {
if (const nsIContent* userContent =
aFrame->GetContent()->GetChromeOnlyAccessSubtreeRootParent()) {
if (const nsIFrame* frame = userContent->GetPrimaryFrame()) {
return frame->StyleMargin()->GetScrollMargin();
}
}
}
return aFrame->StyleMargin()->GetScrollMargin();
}
void PresShell::DoScrollContentIntoView() {
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
nsIFrame* frame = mContentToScrollTo->GetPrimaryFrame();
if (!frame || frame->IsHiddenByContentVisibilityOnAnyAncestor(
nsIFrame::IncludeContentVisibility::Hidden)) {
mContentToScrollTo->RemoveProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
return;
}
if (frame->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
// The reflow flush before this scroll got interrupted, and this frame's
// coords and size are all zero, and it has no content showing anyway.
// Don't bother scrolling to it. We'll try again when we finish up layout.
return;
}
auto* data = static_cast<ScrollIntoViewData*>(
mContentToScrollTo->GetProperty(nsGkAtoms::scrolling));
if (MOZ_UNLIKELY(!data)) {
mContentToScrollTo = nullptr;
return;
}
ScrollFrameIntoView(frame, Nothing(), data->mContentScrollVAxis,
data->mContentScrollHAxis, data->mContentToScrollToFlags);
}
bool PresShell::ScrollFrameIntoView(
nsIFrame* aTargetFrame, const Maybe<nsRect>& aKnownRectRelativeToTarget,
ScrollAxis aVertical, ScrollAxis aHorizontal, ScrollFlags aScrollFlags) {
// The scroll margin only applies to the whole bounds of the element, so don't
// apply it if we get an arbitrary rect / point to scroll to.
const nsMargin scrollMargin =
aKnownRectRelativeToTarget ? nsMargin() : GetScrollMargin(aTargetFrame);
Sides skipPaddingSides;
const auto MaybeSkipPaddingSides = [&](nsIFrame* aFrame) {
if (!aFrame->IsStickyPositioned()) {
return;
}
const nsPoint pos = aFrame->GetPosition();
const nsPoint normalPos = aFrame->GetNormalPosition();
if (pos == normalPos) {
return; // Frame is not stuck.
}
// If we're targetting a sticky element, make sure not to apply
// scroll-padding on the direction we're stuck.
const auto& offsets = aFrame->StylePosition()->mOffset;
for (auto side : AllPhysicalSides()) {
if (offsets.Get(side).IsAuto()) {
continue;
}
// See if this axis is stuck.
const bool yAxis = side == eSideTop || side == eSideBottom;
const bool stuck = yAxis ? pos.y != normalPos.y : pos.x != normalPos.x;
if (!stuck) {
continue;
}
skipPaddingSides |= SideToSideBit(side);
}
};
nsIFrame* container = aTargetFrame;
// This function needs to work even if rect has a width or height of 0.
nsRect rect = [&] {
if (aKnownRectRelativeToTarget) {
return *aKnownRectRelativeToTarget;
}
MaybeSkipPaddingSides(aTargetFrame);
while (nsIFrame* parent = container->GetParent()) {
container = parent;
if (static_cast<nsIScrollableFrame*>(do_QueryFrame(container))) {
// We really just need a non-fragmented frame so that we can accumulate
// the bounds of all our continuations relative to it. We shouldn't jump
// out of our nearest scrollable frame, and that's an ok reference
// frame, so try to use that, or the root frame if there's nothing to
// scroll in this document.
break;
}
MaybeSkipPaddingSides(container);
}
MOZ_DIAGNOSTIC_ASSERT(container);
nsRect targetFrameBounds;
{
bool haveRect = false;
const bool useWholeLineHeightForInlines =
aVertical.mWhenToScroll != WhenToScroll::IfNotFullyVisible;
AutoAssertNoDomMutations
guard; // Ensure use of nsILineIterators is safe.
nsIFrame* prevBlock = nullptr;
// Reuse the same line iterator across calls to AccumulateFrameBounds.
// We set it every time we detect a new block (stored in prevBlock).
nsILineIterator* lines = nullptr;
// The last line we found a continuation on in |lines|. We assume that
// later continuations cannot come on earlier lines.
int32_t curLine = 0;
nsIFrame* frame = aTargetFrame;
do {
AccumulateFrameBounds(container, frame, useWholeLineHeightForInlines,
targetFrameBounds, haveRect, prevBlock, lines,
curLine);
} while ((frame = frame->GetNextContinuation()));
}
return targetFrameBounds;
}();
bool didScroll = false;
const nsIFrame* target = aTargetFrame;
// Walk up the frame hierarchy scrolling the rect into view and
// keeping rect relative to container
do {
if (nsIScrollableFrame* sf = do_QueryFrame(container)) {
nsPoint oldPosition = sf->GetScrollPosition();
nsRect targetRect = rect;
// Inflate the scrolled rect by the container's padding in each dimension,
// unless we have 'overflow-clip-box-*: content-box' in that dimension.
auto* disp = container->StyleDisplay();
if (disp->mOverflowClipBoxBlock == StyleOverflowClipBox::ContentBox ||
disp->mOverflowClipBoxInline == StyleOverflowClipBox::ContentBox) {
WritingMode wm = container->GetWritingMode();
bool cbH = (wm.IsVertical() ? disp->mOverflowClipBoxBlock
: disp->mOverflowClipBoxInline) ==
StyleOverflowClipBox::ContentBox;
bool cbV = (wm.IsVertical() ? disp->mOverflowClipBoxInline
: disp->mOverflowClipBoxBlock) ==
StyleOverflowClipBox::ContentBox;
nsMargin padding = container->GetUsedPadding();
if (!cbH) {
padding.left = padding.right = nscoord(0);
}
if (!cbV) {
padding.top = padding.bottom = nscoord(0);
}
targetRect.Inflate(padding);
}
targetRect -= sf->GetScrolledFrame()->GetPosition();
{
AutoWeakFrame wf(container);
ScrollToShowRect(sf, container, target, targetRect, skipPaddingSides,
scrollMargin, aVertical, aHorizontal, aScrollFlags);
if (!wf.IsAlive()) {
return didScroll;
}
}
nsPoint newPosition = sf->LastScrollDestination();
// If the scroll position increased, that means our content moved up,
// so our rect's offset should decrease
rect += oldPosition - newPosition;
if (oldPosition != newPosition) {
didScroll = true;
}
// only scroll one container when this flag is set
if (aScrollFlags & ScrollFlags::ScrollFirstAncestorOnly) {
break;
}
// This scroll container will be the next target element in the nearest
// ancestor scroll container.
target = container;
// We found a sticky scroll container, we shouldn't skip that side
// anymore.
skipPaddingSides = {};
}
MaybeSkipPaddingSides(container);
nsIFrame* parent;
if (container->IsTransformed()) {
container->GetTransformMatrix(ViewportType::Layout, RelativeTo{nullptr},
&parent);
rect =
nsLayoutUtils::TransformFrameRectToAncestor(container, rect, parent);
} else {
rect += container->GetPosition();
parent = container->GetParent();
}
if (!parent && !(aScrollFlags & ScrollFlags::ScrollNoParentFrames)) {
nsPoint extraOffset(0, 0);
int32_t APD = container->PresContext()->AppUnitsPerDevPixel();
parent = nsLayoutUtils::GetCrossDocParentFrameInProcess(container,
&extraOffset);
if (parent) {
int32_t parentAPD = parent->PresContext()->AppUnitsPerDevPixel();
rect = rect.ScaleToOtherAppUnitsRoundOut(APD, parentAPD);
rect += extraOffset;
} else {
nsCOMPtr<nsIDocShell> docShell =
container->PresContext()->GetDocShell();
if (BrowserChild* browserChild = BrowserChild::GetFrom(docShell)) {
// Defer to the parent document if this is an out-of-process iframe.
Unused << browserChild->SendScrollRectIntoView(
rect, aVertical, aHorizontal, aScrollFlags, APD);
}
}
}
container = parent;
} while (container);
return didScroll;
}
void PresShell::ScheduleViewManagerFlush() {
if (MOZ_UNLIKELY(mIsDestroying)) {
return;
}
nsPresContext* presContext = GetPresContext();
if (presContext) {
presContext->RefreshDriver()->ScheduleViewManagerFlush();
}
SetNeedLayoutFlush();
}
void PresShell::DispatchSynthMouseMove(WidgetGUIEvent* aEvent) {
AUTO_PROFILER_TRACING_MARKER_DOCSHELL("Paint", "DispatchSynthMouseMove",
GRAPHICS, mPresContext->GetDocShell());
nsEventStatus status = nsEventStatus_eIgnore;
nsView* targetView = nsView::GetViewFor(aEvent->mWidget);
if (!targetView) return;
RefPtr<nsViewManager> viewManager = targetView->GetViewManager();
viewManager->DispatchEvent(aEvent, targetView, &status);
}
void PresShell::ClearMouseCaptureOnView(nsView* aView) {
if (nsIContent* capturingContent = GetCapturingContent()) {
if (aView) {
// if a view was specified, ensure that the captured content is within
// this view.
nsIFrame* frame = capturingContent->GetPrimaryFrame();
if (frame) {
nsView* view = frame->GetClosestView();
// if there is no view, capturing won't be handled any more, so
// just release the capture.
if (view) {
do {
if (view == aView) {
ReleaseCapturingContent();
// the view containing the captured content likely disappeared so
// disable capture for now.
AllowMouseCapture(false);
break;
}
view = view->GetParent();
} while (view);
// return if the view wasn't found
return;
}
}
}
ReleaseCapturingContent();
}
// disable mouse capture until the next mousedown as a dialog has opened
// or a drag has started. Otherwise, someone could start capture during
// the modal dialog or drag.
AllowMouseCapture(false);
}
void PresShell::ClearMouseCapture() {
ReleaseCapturingContent();
AllowMouseCapture(false);
}
void PresShell::ClearMouseCapture(nsIFrame* aFrame) {
MOZ_ASSERT(aFrame);
nsIContent* capturingContent = GetCapturingContent();
if (!capturingContent) {
return;
}
nsIFrame* capturingFrame = capturingContent->GetPrimaryFrame();
const bool shouldClear =
!capturingFrame ||
nsLayoutUtils::IsAncestorFrameCrossDocInProcess(aFrame, capturingFrame);
if (shouldClear) {
ClearMouseCapture();
}
}
nsresult PresShell::CaptureHistoryState(nsILayoutHistoryState** aState) {
MOZ_ASSERT(nullptr != aState, "null state pointer");
// We actually have to mess with the docshell here, since we want to
// store the state back in it.
// XXXbz this isn't really right, since this is being called in the
// content viewer's Hide() method... by that point the docshell's
// state could be wrong. We should sort out a better ownership
// model for the layout history state.
nsCOMPtr<nsIDocShell> docShell(mPresContext->GetDocShell());
if (!docShell) return NS_ERROR_FAILURE;
nsCOMPtr<nsILayoutHistoryState> historyState;
docShell->GetLayoutHistoryState(getter_AddRefs(historyState));
if (!historyState) {
// Create the document state object
historyState = NS_NewLayoutHistoryState();
docShell->SetLayoutHistoryState(historyState);
}
*aState = historyState;
NS_IF_ADDREF(*aState);
// Capture frame state for the entire frame hierarchy
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) return NS_OK;
mFrameConstructor->CaptureFrameState(rootFrame, historyState);
return NS_OK;
}
void PresShell::ScheduleBeforeFirstPaint() {
if (!mDocument->IsResourceDoc()) {
// Notify observers that a new page is about to be drawn. Execute this
// as soon as it is safe to run JS, which is guaranteed to be before we
// go back to the event loop and actually draw the page.
MOZ_LOG(gLog, LogLevel::Debug,
("PresShell::ScheduleBeforeFirstPaint this=%p", this));
nsContentUtils::AddScriptRunner(
new nsBeforeFirstPaintDispatcher(mDocument));
}
}
void PresShell::UnsuppressAndInvalidate() {
// Note: We ignore the EnsureVisible check for resource documents, because
// they won't have a docshell, so they'll always fail EnsureVisible.
if ((!mDocument->IsResourceDoc() && !mPresContext->EnsureVisible()) ||
mHaveShutDown) {
// No point; we're about to be torn down anyway.
return;
}
ScheduleBeforeFirstPaint();
PROFILER_MARKER_UNTYPED("UnsuppressAndInvalidate", GRAPHICS);
mPaintingSuppressed = false;
if (nsIFrame* rootFrame = mFrameConstructor->GetRootFrame()) {
// let's assume that outline on a root frame is not supported
rootFrame->InvalidateFrame();
}
if (mPresContext->IsRootContentDocumentCrossProcess()) {
if (auto* bc = BrowserChild::GetFrom(mDocument->GetDocShell())) {
if (mDocument->IsInitialDocument()) {
bc->SendDidUnsuppressPaintingNormalPriority();
} else {
bc->SendDidUnsuppressPainting();
}
}
}
// now that painting is unsuppressed, focus may be set on the document
if (nsPIDOMWindowOuter* win = mDocument->GetWindow()) {
win->SetReadyForFocus();
}
if (!mHaveShutDown) {
SynthesizeMouseMove(false);
ScheduleApproximateFrameVisibilityUpdateNow();
}
}
void PresShell::CancelPaintSuppressionTimer() {
if (mPaintSuppressionTimer) {
mPaintSuppressionTimer->Cancel();
mPaintSuppressionTimer = nullptr;
}
}
void PresShell::UnsuppressPainting() {
CancelPaintSuppressionTimer();
if (mIsDocumentGone || !mPaintingSuppressed) {
return;
}
// If we have reflows pending, just wait until we process
// the reflows and get all the frames where we want them
// before actually unlocking the painting. Otherwise
// go ahead and unlock now.
if (!mDirtyRoots.IsEmpty())
mShouldUnsuppressPainting = true;
else
UnsuppressAndInvalidate();
}
// Post a request to handle an arbitrary callback after reflow has finished.
nsresult PresShell::PostReflowCallback(nsIReflowCallback* aCallback) {
void* result = AllocateByObjectID(eArenaObjectID_nsCallbackEventRequest,
sizeof(nsCallbackEventRequest));
nsCallbackEventRequest* request = (nsCallbackEventRequest*)result;
request->callback = aCallback;
request->next = nullptr;
if (mLastCallbackEventRequest) {
mLastCallbackEventRequest = mLastCallbackEventRequest->next = request;
} else {
mFirstCallbackEventRequest = request;
mLastCallbackEventRequest = request;
}
return NS_OK;
}
void PresShell::CancelReflowCallback(nsIReflowCallback* aCallback) {
nsCallbackEventRequest* before = nullptr;
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
while (node) {
nsIReflowCallback* callback = node->callback;
if (callback == aCallback) {
nsCallbackEventRequest* toFree = node;
if (node == mFirstCallbackEventRequest) {
node = node->next;
mFirstCallbackEventRequest = node;
NS_ASSERTION(before == nullptr, "impossible");
} else {
node = node->next;
before->next = node;
}
if (toFree == mLastCallbackEventRequest) {
mLastCallbackEventRequest = before;
}
FreeByObjectID(eArenaObjectID_nsCallbackEventRequest, toFree);
} else {
before = node;
node = node->next;
}
}
}
void PresShell::CancelPostedReflowCallbacks() {
while (mFirstCallbackEventRequest) {
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
mFirstCallbackEventRequest = node->next;
if (!mFirstCallbackEventRequest) {
mLastCallbackEventRequest = nullptr;
}
nsIReflowCallback* callback = node->callback;
FreeByObjectID(eArenaObjectID_nsCallbackEventRequest, node);
if (callback) {
callback->ReflowCallbackCanceled();
}
}
}
void PresShell::HandlePostedReflowCallbacks(bool aInterruptible) {
while (true) {
// Call all our callbacks, tell us if we need to flush again.
bool shouldFlush = false;
while (mFirstCallbackEventRequest) {
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
mFirstCallbackEventRequest = node->next;
if (!mFirstCallbackEventRequest) {
mLastCallbackEventRequest = nullptr;
}
nsIReflowCallback* callback = node->callback;
FreeByObjectID(eArenaObjectID_nsCallbackEventRequest, node);
if (callback && callback->ReflowFinished()) {
shouldFlush = true;
}
}
if (!shouldFlush || mIsDestroying) {
return;
}
// The flush might cause us to have more callbacks.
const auto flushType =
aInterruptible ? FlushType::InterruptibleLayout : FlushType::Layout;
FlushPendingNotifications(flushType);
}
}
bool PresShell::IsSafeToFlush() const {
// Not safe if we are getting torn down, reflowing, or in the middle of frame
// construction.
if (mIsReflowing || mChangeNestCount || mIsDestroying) {
return false;
}
// Not safe if we are painting
if (nsViewManager* viewManager = GetViewManager()) {
bool isPainting = false;
viewManager->IsPainting(isPainting);
if (isPainting) {
return false;
}
}
return true;
}
void PresShell::NotifyFontFaceSetOnRefresh() {
if (FontFaceSet* set = mDocument->GetFonts()) {
set->DidRefresh();
}
}
void PresShell::DoFlushPendingNotifications(FlushType aType) {
// by default, flush animations if aType >= FlushType::Style
mozilla::ChangesToFlush flush(aType, aType >= FlushType::Style);
FlushPendingNotifications(flush);
}
#ifdef DEBUG
static void AssertFrameSubtreeIsSane(const nsIFrame& aRoot) {
if (const nsIContent* content = aRoot.GetContent()) {
MOZ_ASSERT(content->GetFlattenedTreeParentNodeForStyle(),
"Node not in the flattened tree still has a frame?");
}
for (const auto& childList : aRoot.ChildLists()) {
for (const nsIFrame* child : childList.mList) {
AssertFrameSubtreeIsSane(*child);
}
}
}
#endif
static inline void AssertFrameTreeIsSane(const PresShell& aPresShell) {
#ifdef DEBUG
if (const nsIFrame* root = aPresShell.GetRootFrame()) {
AssertFrameSubtreeIsSane(*root);
}
#endif
}
static void TriggerPendingScrollTimelineAnimations(Document* aDocument) {
auto* tracker = aDocument->GetScrollTimelineAnimationTracker();
if (!tracker || !tracker->HasPendingAnimations()) {
return;
}
tracker->TriggerPendingAnimations();
}
void PresShell::DoFlushPendingNotifications(mozilla::ChangesToFlush aFlush) {
// FIXME(emilio, bug 1530177): Turn into a release assert when bug 1530188 and
// bug 1530190 are fixed.
MOZ_DIAGNOSTIC_ASSERT(!mForbiddenToFlush, "This is bad!");
// Per our API contract, hold a strong ref to ourselves until we return.
RefPtr<PresShell> kungFuDeathGrip = this;
/**
* VERY IMPORTANT: If you add some sort of new flushing to this
* method, make sure to add the relevant SetNeedLayoutFlush or
* SetNeedStyleFlush calls on the shell.
*/
FlushType flushType = aFlush.mFlushType;
// If this is a layout flush, first update the relevancy of any content
// of elements with `content-visibility: auto` so that the values
// returned from script queries are up-to-date.
if (flushType >= mozilla::FlushType::Layout) {
UpdateRelevancyOfContentVisibilityAutoFrames();
}
MOZ_ASSERT(NeedFlush(flushType), "Why did we get called?");
AUTO_PROFILER_MARKER_TEXT(
"DoFlushPendingNotifications", LAYOUT,
MarkerOptions(MarkerStack::Capture(), MarkerInnerWindowIdFromDocShell(
mPresContext->GetDocShell())),
nsDependentCString(kFlushTypeNames[flushType]));
AUTO_PROFILER_LABEL_DYNAMIC_CSTR_NONSENSITIVE(
"PresShell::DoFlushPendingNotifications", LAYOUT,
kFlushTypeNames[flushType]);
#ifdef ACCESSIBILITY
# ifdef DEBUG
if (nsAccessibilityService* accService = GetAccService()) {
NS_ASSERTION(!accService->IsProcessingRefreshDriverNotification(),
"Flush during accessible tree update!");
}
# endif
#endif
NS_ASSERTION(flushType >= FlushType::Style, "Why did we get called?");
mNeedStyleFlush = false;
mNeedThrottledAnimationFlush =
mNeedThrottledAnimationFlush && !aFlush.mFlushAnimations;
mNeedLayoutFlush =
mNeedLayoutFlush && (flushType < FlushType::InterruptibleLayout);
bool isSafeToFlush = IsSafeToFlush();
// If layout could possibly trigger scripts, then it's only safe to flush if
// it's safe to run script.
bool hasHadScriptObject;
if (mDocument->GetScriptHandlingObject(hasHadScriptObject) ||
hasHadScriptObject) {
isSafeToFlush = isSafeToFlush && nsContentUtils::IsSafeToRunScript();
}
// Don't flush if the doc is already in the bfcache.
if (MOZ_UNLIKELY(mDocument->GetPresShell() != this)) {
MOZ_DIAGNOSTIC_ASSERT(!mDocument->GetPresShell(),
"Where did this shell come from?");
isSafeToFlush = false;
}
MOZ_DIAGNOSTIC_ASSERT(!mIsDestroying || !isSafeToFlush);
MOZ_DIAGNOSTIC_ASSERT(mIsDestroying || mViewManager);
MOZ_DIAGNOSTIC_ASSERT(mIsDestroying || mDocument->HasShellOrBFCacheEntry());
// Make sure the view manager stays alive.
RefPtr<nsViewManager> viewManager = mViewManager;
bool didStyleFlush = false;
bool didLayoutFlush = false;
if (isSafeToFlush) {
// Record that we are in a flush, so that our optimization in
// Document::FlushPendingNotifications doesn't skip any re-entrant
// calls to us. Otherwise, we might miss some needed flushes, since
// we clear mNeedStyleFlush / mNeedLayoutFlush here at the top of
// the function but we might not have done the work yet.
AutoRestore<bool> guard(mInFlush);
mInFlush = true;
// We need to make sure external resource documents are flushed too (for
// example, svg filters that reference a filter in an external document
// need the frames in the external document to be constructed for the
// filter to work). We only need external resources to be flushed when the
// main document is flushing >= FlushType::Frames, so we flush external
// resources here instead of Document::FlushPendingNotifications.
mDocument->FlushExternalResources(flushType);
// Force flushing of any pending content notifications that might have
// queued up while our event was pending. That will ensure that we don't
// construct frames for content right now that's still waiting to be
// notified on,
mDocument->FlushPendingNotifications(FlushType::ContentAndNotify);
mDocument->UpdateSVGUseElementShadowTrees();
// Process pending restyles, since any flush of the presshell wants
// up-to-date style data.
if (MOZ_LIKELY(!mIsDestroying)) {
viewManager->FlushDelayedResize();
mPresContext->FlushPendingMediaFeatureValuesChanged();
}
if (MOZ_LIKELY(!mIsDestroying)) {
// Now that we have flushed media queries, update the rules before looking
// up @font-face / @counter-style / @font-feature-values rules.
StyleSet()->UpdateStylistIfNeeded();
// Flush any pending update of the user font set, since that could
// cause style changes (for updating ex/ch units, and to cause a
// reflow).
mDocument->FlushUserFontSet();
mPresContext->FlushCounterStyles();
mPresContext->FlushFontFeatureValues();
mPresContext->FlushFontPaletteValues();
// Flush any requested SMIL samples.
if (mDocument->HasAnimationController()) {
mDocument->GetAnimationController()->FlushResampleRequests();
}
}
// The FlushResampleRequests() above flushed style changes.
if (MOZ_LIKELY(!mIsDestroying) && aFlush.mFlushAnimations &&
mPresContext->EffectCompositor()) {
mPresContext->EffectCompositor()->PostRestyleForThrottledAnimations();
}
// The FlushResampleRequests() above flushed style changes.
if (MOZ_LIKELY(!mIsDestroying)) {
nsAutoScriptBlocker scriptBlocker;
Maybe<uint64_t> innerWindowID;
if (auto* window = mDocument->GetInnerWindow()) {
innerWindowID = Some(window->WindowID());
}
AutoProfilerStyleMarker tracingStyleFlush(std::move(mStyleCause),
innerWindowID);
PerfStats::AutoMetricRecording<PerfStats::Metric::Styling> autoRecording;
LAYOUT_TELEMETRY_RECORD_BASE(Restyle);
mPresContext->RestyleManager()->ProcessPendingRestyles();
mNeedStyleFlush = false;
}
AssertFrameTreeIsSane(*this);
didStyleFlush = true;
// There might be more pending constructors now, but we're not going to
// worry about them. They can't be triggered during reflow, so we should
// be good.
if (flushType >= (SuppressInterruptibleReflows()
? FlushType::Layout
: FlushType::InterruptibleLayout) &&
!mIsDestroying) {
didLayoutFlush = true;
if (DoFlushLayout(/* aInterruptible = */ flushType < FlushType::Layout)) {
if (mContentToScrollTo) {
DoScrollContentIntoView();
if (mContentToScrollTo) {
mContentToScrollTo->RemoveProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
}
}
}
}
FlushPendingScrollResnap();
if (MOZ_LIKELY(!mIsDestroying)) {
// Try to trigger pending scroll-driven animations after we flush
// style and layout (if any). If we try to trigger them after flushing
// style but the frame tree is not ready, we will check them again after
// we flush layout because the requirement to trigger scroll-driven
// animations is that the associated scroll containers are ready (i.e. the
// scroll-timeline is active), and this depends on the readiness of the
// scrollable frame and the primary frame of the scroll container.
TriggerPendingScrollTimelineAnimations(mDocument);
}
if (flushType >= FlushType::Layout) {
if (!mIsDestroying) {
viewManager->UpdateWidgetGeometry();
}
}
}
if (!didStyleFlush && flushType >= FlushType::Style && !mIsDestroying) {
SetNeedStyleFlush();
if (aFlush.mFlushAnimations) {
SetNeedThrottledAnimationFlush();
}
}
if (!didLayoutFlush && flushType >= FlushType::InterruptibleLayout &&
!mIsDestroying) {
// We suppressed this flush either due to it not being safe to flush,
// or due to SuppressInterruptibleReflows(). Either way, the
// mNeedLayoutFlush flag needs to be re-set.
SetNeedLayoutFlush();
}
// Update flush counters
if (didStyleFlush) {
mLayoutTelemetry.IncReqsPerFlush(FlushType::Style);
}
if (didLayoutFlush) {
mLayoutTelemetry.IncReqsPerFlush(FlushType::Layout);
}
// Record telemetry for the number of requests per each flush type.
//
// Flushes happen as style or style+layout. This depends upon the `flushType`
// where flushType >= InterruptibleLayout means flush layout and flushType >=
// Style means flush style. We only report if didLayoutFlush or didStyleFlush
// is true because we care if a flush really did take place. (Flush is guarded
// by `isSafeToFlush == true`.)
if (flushType >= FlushType::InterruptibleLayout && didLayoutFlush) {
MOZ_ASSERT(didLayoutFlush == didStyleFlush);
mLayoutTelemetry.PingReqsPerFlushTelemetry(FlushType::Layout);
} else if (flushType >= FlushType::Style && didStyleFlush) {
MOZ_ASSERT(!didLayoutFlush);
mLayoutTelemetry.PingReqsPerFlushTelemetry(FlushType::Style);
}
}
MOZ_CAN_RUN_SCRIPT_BOUNDARY void PresShell::CharacterDataChanged(
nsIContent* aContent, const CharacterDataChangeInfo& aInfo) {
MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript());
MOZ_ASSERT(!mIsDocumentGone, "Unexpected CharacterDataChanged");
MOZ_ASSERT(aContent->OwnerDoc() == mDocument, "Unexpected document");
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->CharacterDataChanged(aContent, aInfo);
mFrameConstructor->CharacterDataChanged(aContent, aInfo);
}
MOZ_CAN_RUN_SCRIPT_BOUNDARY void PresShell::ElementStateChanged(
Document* aDocument, Element* aElement, ElementState aStateMask) {
MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript());
MOZ_ASSERT(!mIsDocumentGone, "Unexpected ContentStateChanged");
MOZ_ASSERT(aDocument == mDocument, "Unexpected aDocument");
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->ElementStateChanged(aElement, aStateMask);
}
}
MOZ_CAN_RUN_SCRIPT_BOUNDARY void PresShell::CustomStatesWillChange(
Element& aElement) {
if (MOZ_UNLIKELY(!mDidInitialize)) {
return;
}
mPresContext->RestyleManager()->CustomStatesWillChange(aElement);
}
MOZ_CAN_RUN_SCRIPT_BOUNDARY void PresShell::CustomStateChanged(
Element& aElement, nsAtom* aState) {
MOZ_ASSERT(!mIsDocumentGone, "Unexpected CustomStateChanged");
MOZ_ASSERT(aState, "Unexpected empty state");
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->CustomStateChanged(aElement, aState);
}
}
void PresShell::DocumentStatesChanged(DocumentState aStateMask) {
MOZ_ASSERT(!mIsDocumentGone, "Unexpected DocumentStatesChanged");
MOZ_ASSERT(mDocument);
MOZ_ASSERT(!aStateMask.IsEmpty());
if (mDidInitialize) {
StyleSet()->InvalidateStyleForDocumentStateChanges(aStateMask);
}
if (aStateMask.HasState(DocumentState::WINDOW_INACTIVE)) {
if (nsIFrame* root = mFrameConstructor->GetRootFrame()) {
root->SchedulePaint();
}
}
}
MOZ_CAN_RUN_SCRIPT_BOUNDARY void PresShell::AttributeWillChange(
Element* aElement, int32_t aNameSpaceID, nsAtom* aAttribute,
int32_t aModType) {
MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript());
MOZ_ASSERT(!mIsDocumentGone, "Unexpected AttributeWillChange");
MOZ_ASSERT(aElement->OwnerDoc() == mDocument, "Unexpected document");
// XXXwaterson it might be more elegant to wait until after the
// initial reflow to begin observing the document. That would
// squelch any other inappropriate notifications as well.
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->AttributeWillChange(aElement, aNameSpaceID,
aAttribute, aModType);
}
}
MOZ_CAN_RUN_SCRIPT_BOUNDARY void PresShell::AttributeChanged(
Element* aElement, int32_t aNameSpaceID, nsAtom* aAttribute,
int32_t aModType, const nsAttrValue* aOldValue) {
MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript());
MOZ_ASSERT(!mIsDocumentGone, "Unexpected AttributeChanged");
MOZ_ASSERT(aElement->OwnerDoc() == mDocument, "Unexpected document");
// XXXwaterson it might be more elegant to wait until after the
// initial reflow to begin observing the document. That would
// squelch any other inappropriate notifications as well.
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->AttributeChanged(
aElement, aNameSpaceID, aAttribute, aModType, aOldValue);
}
}
MOZ_CAN_RUN_SCRIPT_BOUNDARY void PresShell::ContentAppended(
nsIContent* aFirstNewContent) {
MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript());
MOZ_ASSERT(!mIsDocumentGone, "Unexpected ContentAppended");
MOZ_ASSERT(aFirstNewContent->OwnerDoc() == mDocument, "Unexpected document");
// We never call ContentAppended with a document as the container, so we can
// assert that we have an nsIContent parent.
MOZ_ASSERT(aFirstNewContent->GetParent());
MOZ_ASSERT(aFirstNewContent->GetParent()->IsElement() ||
aFirstNewContent->GetParent()->IsShadowRoot());
if (!mDidInitialize) {
return;
}
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
mPresContext->RestyleManager()->ContentAppended(aFirstNewContent);
mFrameConstructor->ContentAppended(
aFirstNewContent, nsCSSFrameConstructor::InsertionKind::Async);
}
MOZ_CAN_RUN_SCRIPT_BOUNDARY void PresShell::ContentInserted(
nsIContent* aChild) {
MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript());
MOZ_ASSERT(!mIsDocumentGone, "Unexpected ContentInserted");
MOZ_ASSERT(aChild->OwnerDoc() == mDocument, "Unexpected document");
if (!mDidInitialize) {
return;
}
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
mPresContext->RestyleManager()->ContentInserted(aChild);
mFrameConstructor->ContentInserted(
aChild, nsCSSFrameConstructor::InsertionKind::Async);
}
MOZ_CAN_RUN_SCRIPT_BOUNDARY void PresShell::ContentRemoved(
nsIContent* aChild, nsIContent* aPreviousSibling) {
MOZ_ASSERT(!nsContentUtils::IsSafeToRunScript());
MOZ_ASSERT(!mIsDocumentGone, "Unexpected ContentRemoved");
MOZ_ASSERT(aChild->OwnerDoc() == mDocument, "Unexpected document");
nsINode* container = aChild->GetParentNode();
// Notify the ESM that the content has been removed, so that
// it can clean up any state related to the content.
mPresContext->EventStateManager()->ContentRemoved(mDocument, aChild);
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
nsIContent* oldNextSibling = nullptr;
// Editor calls into here with NAC via HTMLEditor::DeleteRefToAnonymousNode.
// This could be asserted if that caller is fixed.
if (MOZ_LIKELY(!aChild->IsRootOfNativeAnonymousSubtree())) {
oldNextSibling = aPreviousSibling ? aPreviousSibling->GetNextSibling()
: container->GetFirstChild();
}
// After removing aChild from tree we should save information about live
// ancestor
if (mPointerEventTarget &&
mPointerEventTarget->IsInclusiveDescendantOf(aChild)) {
mPointerEventTarget = aChild->GetParent();
}
mFrameConstructor->ContentRemoved(aChild, oldNextSibling,
nsCSSFrameConstructor::REMOVE_CONTENT);
// NOTE(emilio): It's important that this goes after the frame constructor
// stuff, otherwise the frame constructor can't see elements which are
// display: contents / display: none, because we'd have cleared all the style
// data from there.
mPresContext->RestyleManager()->ContentRemoved(aChild, oldNextSibling);
}
void PresShell::NotifyCounterStylesAreDirty() {
// TODO: Looks like that nsFrameConstructor::NotifyCounterStylesAreDirty()
// does not run script. If so, we don't need to block script with
// nsAutoCauseReflowNotifier here. Instead, there should be methods
// and stack only class which manages only mChangeNestCount for
// avoiding unnecessary `MOZ_CAN_RUN_SCRIPT` marking.
nsAutoCauseReflowNotifier reflowNotifier(this);
mFrameConstructor->NotifyCounterStylesAreDirty();
}
bool PresShell::FrameIsAncestorOfDirtyRoot(nsIFrame* aFrame) const {
return mDirtyRoots.FrameIsAncestorOfAnyElement(aFrame);
}
void PresShell::ReconstructFrames() {
MOZ_ASSERT(!mFrameConstructor->GetRootFrame() || mDidInitialize,
"Must not have root frame before initial reflow");
if (!mDidInitialize || mIsDestroying) {
// Nothing to do here
return;
}
if (Element* root = mDocument->GetRootElement()) {
PostRecreateFramesFor(root);
}
mDocument->FlushPendingNotifications(FlushType::Frames);
}
nsresult PresShell::RenderDocument(const nsRect& aRect,
RenderDocumentFlags aFlags,
nscolor aBackgroundColor,
gfxContext* aThebesContext) {
NS_ENSURE_TRUE(!(aFlags & RenderDocumentFlags::IsUntrusted),
NS_ERROR_NOT_IMPLEMENTED);
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext) {
rootPresContext->FlushWillPaintObservers();
if (mIsDestroying) return NS_OK;
}
nsAutoScriptBlocker blockScripts;
// Set up the rectangle as the path in aThebesContext
gfxRect r(0, 0, nsPresContext::AppUnitsToFloatCSSPixels(aRect.width),
nsPresContext::AppUnitsToFloatCSSPixels(aRect.height));
aThebesContext->NewPath();
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
aThebesContext->SnappedRectangle(r);
#else
aThebesContext->Rectangle(r);
#endif
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) {
// Nothing to paint, just fill the rect
aThebesContext->SetColor(sRGBColor::FromABGR(aBackgroundColor));
aThebesContext->Fill();
return NS_OK;
}
gfxContextAutoSaveRestore save(aThebesContext);
MOZ_ASSERT(aThebesContext->CurrentOp() == CompositionOp::OP_OVER);
aThebesContext->Clip();
nsDeviceContext* devCtx = mPresContext->DeviceContext();
gfxPoint offset(-nsPresContext::AppUnitsToFloatCSSPixels(aRect.x),
-nsPresContext::AppUnitsToFloatCSSPixels(aRect.y));
gfxFloat scale =
gfxFloat(devCtx->AppUnitsPerDevPixel()) / AppUnitsPerCSSPixel();
// Since canvas APIs use floats to set up their matrices, we may have some
// slight rounding errors here. We use NudgeToIntegers() here to adjust
// matrix components that are integers up to the accuracy of floats to be
// those integers.
gfxMatrix newTM = aThebesContext->CurrentMatrixDouble()
.PreTranslate(offset)
.PreScale(scale, scale)
.NudgeToIntegers();
aThebesContext->SetMatrixDouble(newTM);
AutoSaveRestoreRenderingState _(this);
bool wouldFlushRetainedLayers = false;
PaintFrameFlags flags = PaintFrameFlags::IgnoreSuppression;
if (aThebesContext->CurrentMatrix().HasNonIntegerTranslation()) {
flags |= PaintFrameFlags::InTransform;
}
if (!(aFlags & RenderDocumentFlags::AsyncDecodeImages)) {
flags |= PaintFrameFlags::SyncDecodeImages;
}
if (aFlags & RenderDocumentFlags::UseHighQualityScaling) {
flags |= PaintFrameFlags::UseHighQualityScaling;
}
if (aFlags & RenderDocumentFlags::UseWidgetLayers) {
// We only support using widget layers on display root's with widgets.
nsView* view = rootFrame->GetView();
if (view && view->GetWidget() &&
nsLayoutUtils::GetDisplayRootFrame(rootFrame) == rootFrame) {
WindowRenderer* renderer = view->GetWidget()->GetWindowRenderer();
// WebRenderLayerManagers in content processes
// don't support taking snapshots.
if (renderer &&
(!renderer->AsKnowsCompositor() || XRE_IsParentProcess())) {
flags |= PaintFrameFlags::WidgetLayers;
}
}
}
if (!(aFlags & RenderDocumentFlags::DrawCaret)) {
wouldFlushRetainedLayers = true;
flags |= PaintFrameFlags::HideCaret;
}
if (aFlags & RenderDocumentFlags::IgnoreViewportScrolling) {
wouldFlushRetainedLayers = !IgnoringViewportScrolling();
mRenderingStateFlags |= RenderingStateFlags::IgnoringViewportScrolling;
}
if (aFlags & RenderDocumentFlags::ResetViewportScrolling) {
wouldFlushRetainedLayers = true;
flags |= PaintFrameFlags::ResetViewportScrolling;
}
if (aFlags & RenderDocumentFlags::DrawWindowNotFlushing) {
mRenderingStateFlags |= RenderingStateFlags::DrawWindowNotFlushing;
}
if (aFlags & RenderDocumentFlags::DocumentRelative) {
// XXX be smarter about this ... drawWindow might want a rect
// that's "pretty close" to what our retained layer tree covers.
// In that case, it wouldn't disturb normal rendering too much,
// and we should allow it.
wouldFlushRetainedLayers = true;
flags |= PaintFrameFlags::DocumentRelative;
}
// Don't let drawWindow blow away our retained layer tree
if ((flags & PaintFrameFlags::WidgetLayers) && wouldFlushRetainedLayers) {
flags &= ~PaintFrameFlags::WidgetLayers;
}
nsLayoutUtils::PaintFrame(aThebesContext, rootFrame, nsRegion(aRect),
aBackgroundColor,
nsDisplayListBuilderMode::Painting, flags);
return NS_OK;
}
/*
* Clip the display list aList to a range. Returns the clipped
* rectangle surrounding the range.
*/
nsRect PresShell::ClipListToRange(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList, nsRange* aRange) {
// iterate though the display items and add up the bounding boxes of each.
// This will allow the total area of the frames within the range to be
// determined. To do this, remove an item from the bottom of the list, check
// whether it should be part of the range, and if so, append it to the top
// of the temporary list tmpList. If the item is a text frame at the end of
// the selection range, clip it to the portion of the text frame that is
// part of the selection. Then, append the wrapper to the top of the list.
// Otherwise, just delete the item and don't append it.
nsRect surfaceRect;
for (nsDisplayItem* i : aList->TakeItems()) {
if (i->GetType() == DisplayItemType::TYPE_CONTAINER) {
aList->AppendToTop(i);
surfaceRect.UnionRect(
surfaceRect, ClipListToRange(aBuilder, i->GetChildren(), aRange));
continue;
}
// itemToInsert indiciates the item that should be inserted into the
// temporary list. If null, no item should be inserted.
nsDisplayItem* itemToInsert = nullptr;
nsIFrame* frame = i->Frame();
nsIContent* content = frame->GetContent();
if (content) {
bool atStart = (content == aRange->GetStartContainer());
bool atEnd = (content == aRange->GetEndContainer());
if ((atStart || atEnd) && frame->IsTextFrame()) {
auto [frameStartOffset, frameEndOffset] = frame->GetOffsets();
int32_t hilightStart =
atStart ? std::max(static_cast<int32_t>(aRange->StartOffset()),
frameStartOffset)
: frameStartOffset;
int32_t hilightEnd =
atEnd ? std::min(static_cast<int32_t>(aRange->EndOffset()),
frameEndOffset)
: frameEndOffset;
if (hilightStart < hilightEnd) {
// determine the location of the start and end edges of the range.
nsPoint startPoint, endPoint;
frame->GetPointFromOffset(hilightStart, &startPoint);
frame->GetPointFromOffset(hilightEnd, &endPoint);
// The clip rectangle is determined by taking the the start and
// end points of the range, offset from the reference frame.
// Because of rtl, the end point may be to the left of (or above,
// in vertical mode) the start point, so x (or y) is set to the
// lower of the values.
nsRect textRect(aBuilder->ToReferenceFrame(frame), frame->GetSize());
if (frame->GetWritingMode().IsVertical()) {
nscoord y = std::min(startPoint.y, endPoint.y);
textRect.y += y;
textRect.height = std::max(startPoint.y, endPoint.y) - y;
} else {
nscoord x = std::min(startPoint.x, endPoint.x);
textRect.x += x;
textRect.width = std::max(startPoint.x, endPoint.x) - x;
}
surfaceRect.UnionRect(surfaceRect, textRect);
const ActiveScrolledRoot* asr = i->GetActiveScrolledRoot();
DisplayItemClip newClip;
newClip.SetTo(textRect);
const DisplayItemClipChain* newClipChain =
aBuilder->AllocateDisplayItemClipChain(newClip, asr, nullptr);
i->IntersectClip(aBuilder, newClipChain, true);
itemToInsert = i;
}
}
// Don't try to descend into subdocuments.
// If this ever changes we'd need to add handling for subdocuments with
// different zoom levels.
else if (content->GetUncomposedDoc() ==
aRange->GetStartContainer()->GetUncomposedDoc()) {
// if the node is within the range, append it to the temporary list
bool before, after;
nsresult rv =
RangeUtils::CompareNodeToRange(content, aRange, &before, &after);
if (NS_SUCCEEDED(rv) && !before && !after) {
itemToInsert = i;
bool snap;
surfaceRect.UnionRect(surfaceRect, i->GetBounds(aBuilder, &snap));
}
}
}
// insert the item into the list if necessary. If the item has a child
// list, insert that as well
nsDisplayList* sublist = i->GetSameCoordinateSystemChildren();
if (itemToInsert || sublist) {
aList->AppendToTop(itemToInsert ? itemToInsert : i);
// if the item is a list, iterate over it as well
if (sublist)
surfaceRect.UnionRect(surfaceRect,
ClipListToRange(aBuilder, sublist, aRange));
} else {
// otherwise, just delete the item and don't readd it to the list
i->Destroy(aBuilder);
}
}
return surfaceRect;
}
#ifdef DEBUG
# include <stdio.h>
static bool gDumpRangePaintList = false;
#endif
UniquePtr<RangePaintInfo> PresShell::CreateRangePaintInfo(
nsRange* aRange, nsRect& aSurfaceRect, bool aForPrimarySelection) {
nsIFrame* ancestorFrame = nullptr;
nsIFrame* rootFrame = GetRootFrame();
// If the start or end of the range is the document, just use the root
// frame, otherwise get the common ancestor of the two endpoints of the
// range.
nsINode* startContainer = aRange->GetStartContainer();
nsINode* endContainer = aRange->GetEndContainer();
Document* doc = startContainer->GetComposedDoc();
if (startContainer == doc || endContainer == doc) {
ancestorFrame = rootFrame;
} else {
nsINode* ancestor = nsContentUtils::GetClosestCommonInclusiveAncestor(
startContainer, endContainer);
NS_ASSERTION(!ancestor || ancestor->IsContent(),
"common ancestor is not content");
while (ancestor && ancestor->IsContent()) {
ancestorFrame = ancestor->AsContent()->GetPrimaryFrame();
if (ancestorFrame) {
break;
}
ancestor = ancestor->GetParentOrShadowHostNode();
}
// use the nearest ancestor frame that includes all continuations as the
// root for building the display list
while (ancestorFrame &&
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(ancestorFrame))
ancestorFrame = ancestorFrame->GetParent();
}
if (!ancestorFrame) {
return nullptr;
}
// get a display list containing the range
auto info = MakeUnique<RangePaintInfo>(aRange, ancestorFrame);
info->mBuilder.SetIncludeAllOutOfFlows();
if (aForPrimarySelection) {
info->mBuilder.SetSelectedFramesOnly();
}
info->mBuilder.EnterPresShell(ancestorFrame);
ContentSubtreeIterator subtreeIter;
nsresult rv = subtreeIter.Init(aRange);
if (NS_FAILED(rv)) {
return nullptr;
}
auto BuildDisplayListForNode = [&](nsINode* aNode) {
if (MOZ_UNLIKELY(!aNode->IsContent())) {
return;
}
nsIFrame* frame = aNode->AsContent()->GetPrimaryFrame();
// XXX deal with frame being null due to display:contents
for (; frame;
frame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(frame)) {
info->mBuilder.SetVisibleRect(frame->InkOverflowRect());
info->mBuilder.SetDirtyRect(frame->InkOverflowRect());
frame->BuildDisplayListForStackingContext(&info->mBuilder, &info->mList);
}
};
if (startContainer->NodeType() == nsINode::TEXT_NODE) {
BuildDisplayListForNode(startContainer);
}
for (; !subtreeIter.IsDone(); subtreeIter.Next()) {
nsCOMPtr<nsINode> node = subtreeIter.GetCurrentNode();
BuildDisplayListForNode(node);
}
if (endContainer != startContainer &&
endContainer->NodeType() == nsINode::TEXT_NODE) {
BuildDisplayListForNode(endContainer);
}
// If one of the ancestor presShells (including this one) has a resolution
// set, we may have some APZ zoom applied. That means we may want to rasterize
// the nodes at that zoom level. Populate `info` with the relevant information
// so that the caller can decide what to do. Also wrap the display list in
// appropriate nsDisplayAsyncZoom display items. This code handles the general
// case with nested async zooms (even though that never actually happens),
// because it fell out of the implementation for free.
//
// TODO: Do we need to do the same for ancestor transforms?
for (nsPresContext* ctx = GetPresContext(); ctx;
ctx = ctx->GetParentPresContext()) {
PresShell* shell = ctx->PresShell();
float resolution = shell->GetResolution();
// If we are at the root document in the process, try to see if documents
// in enclosing processes have a resolution and include that as well.
if (!ctx->GetParentPresContext()) {
// xScale is an arbitrary choice. Outside of edge cases involving CSS
// transforms, xScale == yScale so it doesn't matter.
resolution *= ViewportUtils::TryInferEnclosingResolution(shell).xScale;
}
if (resolution == 1.0) {
continue;
}
info->mResolution *= resolution;
nsIFrame* rootScrollFrame = shell->GetRootScrollFrame();
ViewID zoomedId =
nsLayoutUtils::FindOrCreateIDFor(rootScrollFrame->GetContent());
nsDisplayList wrapped(&info->mBuilder);
wrapped.AppendNewToTop<nsDisplayAsyncZoom>(&info->mBuilder, rootScrollFrame,
&info->mList, nullptr, zoomedId);
info->mList.AppendToTop(&wrapped);
}
#ifdef DEBUG
if (gDumpRangePaintList) {
fprintf(stderr, "CreateRangePaintInfo --- before ClipListToRange:\n");
nsIFrame::PrintDisplayList(&(info->mBuilder), info->mList);
}
#endif
nsRect rangeRect = ClipListToRange(&info->mBuilder, &info->mList, aRange);
info->mBuilder.LeavePresShell(ancestorFrame, &info->mList);
#ifdef DEBUG
if (gDumpRangePaintList) {
fprintf(stderr, "CreateRangePaintInfo --- after ClipListToRange:\n");
nsIFrame::PrintDisplayList(&(info->mBuilder), info->mList);
}
#endif
// determine the offset of the reference frame for the display list
// to the root frame. This will allow the coordinates used when painting
// to all be offset from the same point
info->mRootOffset = ancestorFrame->GetBoundingClientRect().TopLeft();
rangeRect.MoveBy(info->mRootOffset);
aSurfaceRect.UnionRect(aSurfaceRect, rangeRect);
return info;
}
already_AddRefed<SourceSurface> PresShell::PaintRangePaintInfo(
const nsTArray<UniquePtr<RangePaintInfo>>& aItems, Selection* aSelection,
const Maybe<CSSIntRegion>& aRegion, nsRect aArea,
const LayoutDeviceIntPoint aPoint, LayoutDeviceIntRect* aScreenRect,
RenderImageFlags aFlags) {
nsPresContext* pc = GetPresContext();
if (!pc || aArea.width == 0 || aArea.height == 0) return nullptr;
// use the rectangle to create the surface
LayoutDeviceIntRect pixelArea = LayoutDeviceIntRect::FromAppUnitsToOutside(
aArea, pc->AppUnitsPerDevPixel());
// if the image should not be resized, scale must be 1
float scale = 1.0;
nsRect maxSize;
pc->DeviceContext()->GetClientRect(maxSize);
// check if the image should be resized
bool resize = !!(aFlags & RenderImageFlags::AutoScale);
if (resize) {
// check if image-resizing-algorithm should be used
if (aFlags & RenderImageFlags::IsImage) {
// get max screensize
int32_t maxWidth = pc->AppUnitsToDevPixels(maxSize.width);
int32_t maxHeight = pc->AppUnitsToDevPixels(maxSize.height);
// resize image relative to the screensize
// get best height/width relative to screensize
float bestHeight = float(maxHeight) * RELATIVE_SCALEFACTOR;
float bestWidth = float(maxWidth) * RELATIVE_SCALEFACTOR;
// calculate scale for bestWidth
float adjustedScale = bestWidth / float(pixelArea.width);
// get the worst height (height when width is perfect)
float worstHeight = float(pixelArea.height) * adjustedScale;
// get the difference of best and worst height
float difference = bestHeight - worstHeight;
// halve the difference and add it to worstHeight to get
// the best compromise between bestHeight and bestWidth,
// then calculate the corresponding scale factor
adjustedScale = (worstHeight + difference / 2) / float(pixelArea.height);
// prevent upscaling
scale = std::min(scale, adjustedScale);
} else {
// get half of max screensize
int32_t maxWidth = pc->AppUnitsToDevPixels(maxSize.width >> 1);
int32_t maxHeight = pc->AppUnitsToDevPixels(maxSize.height >> 1);
if (pixelArea.width > maxWidth || pixelArea.height > maxHeight) {
// divide the maximum size by the image size in both directions.
// Whichever direction produces the smallest result determines how much
// should be scaled.
if (pixelArea.width > maxWidth)
scale = std::min(scale, float(maxWidth) / pixelArea.width);
if (pixelArea.height > maxHeight)
scale = std::min(scale, float(maxHeight) / pixelArea.height);
}
}
// Pick a resolution scale factor that is the highest we need for any of
// the items. This means some items may get rendered at a higher-than-needed
// resolution but at least nothing will be avoidably blurry.
float resolutionScale = 1.0;
for (const UniquePtr<RangePaintInfo>& rangeInfo : aItems) {
resolutionScale = std::max(resolutionScale, rangeInfo->mResolution);
}
float unclampedResolution = resolutionScale;
// Clamp the resolution scale so that `pixelArea` when scaled by `scale` and
// `resolutionScale` isn't bigger than `maxSize`. This prevents creating
// giant/unbounded images.
resolutionScale =
std::min(resolutionScale, maxSize.width / (scale * pixelArea.width));
resolutionScale =
std::min(resolutionScale, maxSize.height / (scale * pixelArea.height));
// The following assert should only get hit if pixelArea scaled by `scale`
// alone would already have been bigger than `maxSize`, which should never
// be the case. For release builds we handle gracefully by reverting
// resolutionScale to 1.0 to avoid unexpected consequences.
MOZ_ASSERT(resolutionScale >= 1.0);
resolutionScale = std::max(1.0f, resolutionScale);
scale *= resolutionScale;
// Now we need adjust the output screen position of the surface based on the
// scaling factor and any APZ zoom that may be in effect. The goal is here
// to set `aScreenRect`'s top-left corner (in screen-relative LD pixels)
// such that the scaling effect on the surface appears anchored at `aPoint`
// ("anchor" here is like "transform-origin"). When this code is e.g. used
// to generate a drag image for dragging operations, `aPoint` refers to the
// position of the mouse cursor (also in screen-relative LD pixels), and the
// user-visible effect of doing this is that the point at which the user
// clicked to start the drag remains under the mouse during the drag.
// In order to do this we first compute the top-left corner of the
// pixelArea is screen-relative LD pixels.
LayoutDevicePoint visualPoint = ViewportUtils::ToScreenRelativeVisual(
LayoutDevicePoint(pixelArea.TopLeft()), pc);
// And then adjust the output screen position based on that, which we can do
// since everything here is screen-relative LD pixels. Note that the scale
// factor we use here is the effective "transform" scale applied to the
// content we're painting, relative to the scale at which it would normally
// get painted at as part of page rendering (`unclampedResolution`).
float scaleRelativeToNormalContent = scale / unclampedResolution;
aScreenRect->x =
NSToIntFloor(aPoint.x - float(aPoint.x.value - visualPoint.x.value) *
scaleRelativeToNormalContent);
aScreenRect->y =
NSToIntFloor(aPoint.y - float(aPoint.y.value - visualPoint.y.value) *
scaleRelativeToNormalContent);
pixelArea.width = NSToIntFloor(float(pixelArea.width) * scale);
pixelArea.height = NSToIntFloor(float(pixelArea.height) * scale);
if (!pixelArea.width || !pixelArea.height) {
return nullptr;
}
} else {
// move aScreenRect to the position of the surface in screen coordinates
LayoutDevicePoint visualPoint = ViewportUtils::ToScreenRelativeVisual(
LayoutDevicePoint(pixelArea.TopLeft()), pc);
aScreenRect->MoveTo(RoundedToInt(visualPoint));
}
aScreenRect->width = pixelArea.width;
aScreenRect->height = pixelArea.height;
RefPtr<DrawTarget> dt =
gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
IntSize(pixelArea.width, pixelArea.height), SurfaceFormat::B8G8R8A8);
if (!dt || !dt->IsValid()) {
return nullptr;
}
gfxContext ctx(dt);
if (aRegion) {
RefPtr<PathBuilder> builder = dt->CreatePathBuilder(FillRule::FILL_WINDING);
// Convert aRegion from CSS pixels to dev pixels
nsIntRegion region = aRegion->ToAppUnits(AppUnitsPerCSSPixel())
.ToOutsidePixels(pc->AppUnitsPerDevPixel());
for (auto iter = region.RectIter(); !iter.Done(); iter.Next()) {
const IntRect& rect = iter.Get();
builder->MoveTo(rect.TopLeft());
builder->LineTo(rect.TopRight());
builder->LineTo(rect.BottomRight());
builder->LineTo(rect.BottomLeft());
builder->LineTo(rect.TopLeft());
}
RefPtr<Path> path = builder->Finish();
ctx.Clip(path);
}
gfxMatrix initialTM = ctx.CurrentMatrixDouble();
if (resize) {
initialTM.PreScale(scale, scale);
}
// translate so that points are relative to the surface area
gfxPoint surfaceOffset = nsLayoutUtils::PointToGfxPoint(
-aArea.TopLeft(), pc->AppUnitsPerDevPixel());
initialTM.PreTranslate(surfaceOffset);
// temporarily hide the selection so that text is drawn normally. If a
// selection is being rendered, use that, otherwise use the presshell's
// selection.
RefPtr<nsFrameSelection> frameSelection;
if (aSelection) {
frameSelection = aSelection->GetFrameSelection();
} else {
frameSelection = FrameSelection();
}
int16_t oldDisplaySelection = frameSelection->GetDisplaySelection();
frameSelection->SetDisplaySelection(nsISelectionController::SELECTION_HIDDEN);
// next, paint each range in the selection
for (const UniquePtr<RangePaintInfo>& rangeInfo : aItems) {
// the display lists paint relative to the offset from the reference
// frame, so account for that translation too:
gfxPoint rootOffset = nsLayoutUtils::PointToGfxPoint(
rangeInfo->mRootOffset, pc->AppUnitsPerDevPixel());
ctx.SetMatrixDouble(initialTM.PreTranslate(rootOffset));
aArea.MoveBy(-rangeInfo->mRootOffset.x, -rangeInfo->mRootOffset.y);
nsRegion visible(aArea);
rangeInfo->mList.PaintRoot(&rangeInfo->mBuilder, &ctx,
nsDisplayList::PAINT_DEFAULT, Nothing());
aArea.MoveBy(rangeInfo->mRootOffset.x, rangeInfo->mRootOffset.y);
}
// restore the old selection display state
frameSelection->SetDisplaySelection(oldDisplaySelection);
return dt->Snapshot();
}
already_AddRefed<SourceSurface> PresShell::RenderNode(
nsINode* aNode, const Maybe<CSSIntRegion>& aRegion,
const LayoutDeviceIntPoint aPoint, LayoutDeviceIntRect* aScreenRect,
RenderImageFlags aFlags) {
// area will hold the size of the surface needed to draw the node, measured
// from the root frame.
nsRect area;
nsTArray<UniquePtr<RangePaintInfo>> rangeItems;
// nothing to draw if the node isn't in a document
if (!aNode->IsInComposedDoc()) {
return nullptr;
}
RefPtr<nsRange> range = nsRange::Create(aNode);
IgnoredErrorResult rv;
range->SelectNode(*aNode, rv);
if (rv.Failed()) {
return nullptr;
}
UniquePtr<RangePaintInfo> info = CreateRangePaintInfo(range, area, false);
if (info) {
// XXX(Bug 1631371) Check if this should use a fallible operation as it
// pretended earlier, or change the return type to void.
rangeItems.AppendElement(std::move(info));
}
Maybe<CSSIntRegion> region = aRegion;
if (region) {
// combine the area with the supplied region
CSSIntRect rrectPixels = region->GetBounds();
nsRect rrect = ToAppUnits(rrectPixels, AppUnitsPerCSSPixel());
area.IntersectRect(area, rrect);
nsPresContext* pc = GetPresContext();
if (!pc) return nullptr;
// move the region so that it is offset from the topleft corner of the
// surface
region->MoveBy(-nsPresContext::AppUnitsToIntCSSPixels(area.x),
-nsPresContext::AppUnitsToIntCSSPixels(area.y));
}
return PaintRangePaintInfo(rangeItems, nullptr, region, area, aPoint,
aScreenRect, aFlags);
}
already_AddRefed<SourceSurface> PresShell::RenderSelection(
Selection* aSelection, const LayoutDeviceIntPoint aPoint,
LayoutDeviceIntRect* aScreenRect, RenderImageFlags aFlags) {
// area will hold the size of the surface needed to draw the selection,
// measured from the root frame.
nsRect area;
nsTArray<UniquePtr<RangePaintInfo>> rangeItems;
// iterate over each range and collect them into the rangeItems array.
// This is done so that the size of selection can be determined so as
// to allocate a surface area
const uint32_t rangeCount = aSelection->RangeCount();
NS_ASSERTION(rangeCount > 0, "RenderSelection called with no selection");
for (const uint32_t r : IntegerRange(rangeCount)) {
MOZ_ASSERT(aSelection->RangeCount() == rangeCount);
RefPtr<nsRange> range = aSelection->GetRangeAt(r);
UniquePtr<RangePaintInfo> info = CreateRangePaintInfo(range, area, true);
if (info) {
// XXX(Bug 1631371) Check if this should use a fallible operation as it
// pretended earlier.
rangeItems.AppendElement(std::move(info));
}
}
return PaintRangePaintInfo(rangeItems, aSelection, Nothing(), area, aPoint,
aScreenRect, aFlags);
}
void AddDisplayItemToBottom(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList, nsDisplayItem* aItem) {
if (!aItem) {
return;
}
nsDisplayList list(aBuilder);
list.AppendToTop(aItem);
list.AppendToTop(aList);
aList->AppendToTop(&list);
}
static bool AddCanvasBackgroundColor(const nsDisplayList* aList,
nsIFrame* aCanvasFrame, nscolor aColor,
bool aCSSBackgroundColor) {
for (nsDisplayItem* i : *aList) {
const DisplayItemType type = i->GetType();
if (i->Frame() == aCanvasFrame &&
type == DisplayItemType::TYPE_CANVAS_BACKGROUND_COLOR) {
auto* bg = static_cast<nsDisplayCanvasBackgroundColor*>(i);
bg->SetExtraBackgroundColor(aColor);
return true;
}
const bool isBlendContainer =
type == DisplayItemType::TYPE_BLEND_CONTAINER ||
type == DisplayItemType::TYPE_TABLE_BLEND_CONTAINER;
nsDisplayList* sublist = i->GetSameCoordinateSystemChildren();
if (sublist && !(isBlendContainer && !aCSSBackgroundColor) &&
AddCanvasBackgroundColor(sublist, aCanvasFrame, aColor,
aCSSBackgroundColor)) {
return true;
}
}
return false;
}
void PresShell::AddCanvasBackgroundColorItem(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList,
nsIFrame* aFrame,
const nsRect& aBounds,
nscolor aBackstopColor) {
if (aBounds.IsEmpty()) {
return;
}
const bool isViewport = aFrame->IsViewportFrame();
nscolor canvasColor;
if (isViewport) {
canvasColor = mCanvasBackground.mViewportColor;
} else if (aFrame->IsPageContentFrame()) {
canvasColor = mCanvasBackground.mPageColor;
} else {
// We don't want to add an item for the canvas background color if the frame
// (sub)tree we are painting doesn't include any canvas frames.
return;
}
const nscolor bgcolor = NS_ComposeColors(aBackstopColor, canvasColor);
if (NS_GET_A(bgcolor) == 0) {
return;
}
// To make layers work better, we want to avoid having a big non-scrolled
// color background behind a scrolled transparent background. Instead, we'll
// try to move the color background into the scrolled content by making
// nsDisplayCanvasBackground paint it.
bool addedScrollingBackgroundColor = false;
if (isViewport) {
if (nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable()) {
nsCanvasFrame* canvasFrame = do_QueryFrame(sf->GetScrolledFrame());
if (canvasFrame && canvasFrame->IsVisibleForPainting()) {
// TODO: We should be able to set canvas background color during display
// list building to avoid calling this function.
addedScrollingBackgroundColor = AddCanvasBackgroundColor(
aList, canvasFrame, bgcolor, mCanvasBackground.mCSSSpecified);
}
}
}
// With async scrolling, we'd like to have two instances of the background
// color: one that scrolls with the content (for the reasons stated above),
// and one underneath which does not scroll with the content, but which can
// be shown during checkerboarding and overscroll and the dynamic toolbar
// movement.
// We can only do that if the color is opaque.
bool forceUnscrolledItem =
nsLayoutUtils::UsesAsyncScrolling(aFrame) && NS_GET_A(bgcolor) == 255;
if (!addedScrollingBackgroundColor || forceUnscrolledItem) {
const bool isRootContentDocumentCrossProcess =
mPresContext->IsRootContentDocumentCrossProcess();
MOZ_ASSERT_IF(
!aFrame->GetParent() && isRootContentDocumentCrossProcess &&
mPresContext->HasDynamicToolbar(),
aBounds.Size() ==
nsLayoutUtils::ExpandHeightForDynamicToolbar(
mPresContext, aFrame->InkOverflowRectRelativeToSelf().Size()));
nsDisplaySolidColor* item = MakeDisplayItem<nsDisplaySolidColor>(
aBuilder, aFrame, aBounds, bgcolor);
if (addedScrollingBackgroundColor && isRootContentDocumentCrossProcess) {
item->SetIsCheckerboardBackground();
}
AddDisplayItemToBottom(aBuilder, aList, item);
}
}
bool PresShell::IsTransparentContainerElement() const {
if (mDocument->IsInitialDocument()) {
switch (StaticPrefs::layout_css_initial_document_transparency()) {
case 3:
return true;
case 2:
if (!mDocument->IsTopLevelContentDocument()) {
return true;
}
[[fallthrough]];
case 1:
if (mDocument->IsLikelyContentInaccessibleTopLevelAboutBlank()) {
return true;
}
[[fallthrough]];
default:
break;
}
}
nsPresContext* pc = GetPresContext();
if (!pc->IsRootContentDocumentCrossProcess()) {
if (mDocument->IsInChromeDocShell()) {
return true;
}
// Frames are transparent except if their used embedder color-scheme is
// mismatched, in which case we use an opaque background to avoid
// black-on-black or white-on-white text, see
// https://github.com/w3c/csswg-drafts/issues/4772
if (BrowsingContext* bc = mDocument->GetBrowsingContext()) {
switch (bc->GetEmbedderColorSchemes().mUsed) {
case dom::PrefersColorSchemeOverride::Light:
return pc->DefaultBackgroundColorScheme() == ColorScheme::Light;
case dom::PrefersColorSchemeOverride::Dark:
return pc->DefaultBackgroundColorScheme() == ColorScheme::Dark;
case dom::PrefersColorSchemeOverride::None:
break;
}
}
return true;
}
nsIDocShell* docShell = pc->GetDocShell();
if (!docShell) {
return false;
}
nsPIDOMWindowOuter* pwin = docShell->GetWindow();
if (!pwin) {
return false;
}
if (Element* containerElement = pwin->GetFrameElementInternal()) {
return containerElement->HasAttr(nsGkAtoms::transparent);
}
if (BrowserChild* tab = BrowserChild::GetFrom(docShell)) {
// Check if presShell is the top PresShell. Only the top can influence the
// canvas background color.
return this == tab->GetTopLevelPresShell() && tab->IsTransparent();
}
return false;
}
nscolor PresShell::GetDefaultBackgroundColorToDraw() const {
if (!mPresContext) {
return NS_RGB(255, 255, 255);
}
return mPresContext->DefaultBackgroundColor();
}
void PresShell::UpdateCanvasBackground() {
mCanvasBackground = ComputeCanvasBackground();
}
struct SingleCanvasBackground {
nscolor mColor = 0;
bool mCSSSpecified = false;
};
static SingleCanvasBackground ComputeSingleCanvasBackground(nsIFrame* aCanvas) {
MOZ_ASSERT(aCanvas->IsCanvasFrame());
const nsIFrame* bgFrame = nsCSSRendering::FindBackgroundFrame(aCanvas);
nscolor color = NS_RGBA(0, 0, 0, 0);
bool drawBackgroundImage = false;
bool drawBackgroundColor = false;
if (!bgFrame->IsThemed()) {
// Ignore the CSS background-color if -moz-appearance is used.
color = nsCSSRendering::DetermineBackgroundColor(
aCanvas->PresContext(), bgFrame->Style(), aCanvas, drawBackgroundImage,
drawBackgroundColor);
}
return {color, drawBackgroundColor};
}
PresShell::CanvasBackground PresShell::ComputeCanvasBackground() const {
// If we have a frame tree and it has style information that
// specifies the background color of the canvas, update our local
// cache of that color.
nsIFrame* canvas = GetCanvasFrame();
if (!canvas) {
nscolor color = GetDefaultBackgroundColorToDraw();
// If the root element of the document (ie html) has style 'display: none'
// then the document's background color does not get drawn; return the color
// we actually draw.
return {color, color, false};
}
auto viewportBg = ComputeSingleCanvasBackground(canvas);
if (!IsTransparentContainerElement()) {
viewportBg.mColor =
NS_ComposeColors(GetDefaultBackgroundColorToDraw(), viewportBg.mColor);
}
nscolor pageColor = viewportBg.mColor;
nsCanvasFrame* docElementCb =
mFrameConstructor->GetDocElementContainingBlock();
if (canvas != docElementCb) {
// We're in paged mode / print / print-preview, and just computed the "root"
// canvas background. Compute the doc element containing block background
// too.
MOZ_ASSERT(mPresContext->IsRootPaginatedDocument());
pageColor = ComputeSingleCanvasBackground(docElementCb).mColor;
}
return {viewportBg.mColor, pageColor, viewportBg.mCSSSpecified};
}
nscolor PresShell::ComputeBackstopColor(nsView* aDisplayRoot) {
nsIWidget* widget = aDisplayRoot->GetWidget();
if (widget &&
(widget->GetTransparencyMode() != widget::TransparencyMode::Opaque ||
widget->WidgetPaintsBackground())) {
// Within a transparent widget, so the backstop color must be
// totally transparent.
return NS_RGBA(0, 0, 0, 0);
}
// Within an opaque widget (or no widget at all), so the backstop
// color must be totally opaque. The user's default background
// as reported by the prescontext is guaranteed to be opaque.
return GetDefaultBackgroundColorToDraw();
}
struct PaintParams {
nscolor mBackgroundColor;
};
WindowRenderer* PresShell::GetWindowRenderer() {
NS_ASSERTION(mViewManager, "Should have view manager");
nsView* rootView = mViewManager->GetRootView();
if (rootView) {
if (nsIWidget* widget = rootView->GetWidget()) {
return widget->GetWindowRenderer();
}
}
return nullptr;
}
bool PresShell::AsyncPanZoomEnabled() {
NS_ASSERTION(mViewManager, "Should have view manager");
nsView* rootView = mViewManager->GetRootView();
if (rootView) {
if (nsIWidget* widget = rootView->GetWidget()) {
return widget->AsyncPanZoomEnabled();
}
}
return gfxPlatform::AsyncPanZoomEnabled();
}
nsresult PresShell::SetResolutionAndScaleTo(float aResolution,
ResolutionChangeOrigin aOrigin) {
if (!(aResolution > 0.0)) {
return NS_ERROR_ILLEGAL_VALUE;
}
if (aResolution == mResolution.valueOr(0.0)) {
MOZ_ASSERT(mResolution.isSome());
return NS_OK;
}
// GetResolution handles mResolution being nothing by returning 1 so this
// is checking that the resolution is actually changing.
bool resolutionUpdated = aResolution != GetResolution();
mLastResolutionChangeOrigin = aOrigin;
RenderingState state(this);
state.mResolution = Some(aResolution);
SetRenderingState(state);
if (mMobileViewportManager) {
mMobileViewportManager->ResolutionUpdated(aOrigin);
}
// Changing the resolution changes the visual viewport size which may
// make the current visual viewport offset out-of-bounds (if the size
// increased). APZ will reconcile this by sending a clamped visual
// viewport offset on the next repaint, but to avoid main-thread code
// observing an out-of-bounds offset until then, reclamp it here.
if (IsVisualViewportOffsetSet()) {
SetVisualViewportOffset(GetVisualViewportOffset(),
GetLayoutViewportOffset());
}
if (aOrigin == ResolutionChangeOrigin::Apz) {
mResolutionUpdatedByApz = true;
} else if (resolutionUpdated) {
mResolutionUpdated = true;
}
if (auto* window = nsGlobalWindowInner::Cast(mDocument->GetInnerWindow())) {
window->VisualViewport()->PostResizeEvent();
}
return NS_OK;
}
float PresShell::GetCumulativeResolution() const {
float resolution = GetResolution();
nsPresContext* parentCtx = GetPresContext()->GetParentPresContext();
if (parentCtx) {
resolution *= parentCtx->PresShell()->GetCumulativeResolution();
}
return resolution;
}
void PresShell::SetRestoreResolution(float aResolution,
LayoutDeviceIntSize aDisplaySize) {
if (mMobileViewportManager) {
mMobileViewportManager->SetRestoreResolution(aResolution, aDisplaySize);
}
}
void PresShell::SetRenderingState(const RenderingState& aState) {
if (GetResolution() != aState.mResolution.valueOr(1.f)) {
if (nsIFrame* frame = GetRootFrame()) {
frame->SchedulePaint();
}
}
mRenderingStateFlags = aState.mRenderingStateFlags;
mResolution = aState.mResolution;
#ifdef ACCESSIBILITY
if (nsAccessibilityService* accService = GetAccService()) {
accService->NotifyOfResolutionChange(this, GetResolution());
}
#endif
}
void PresShell::SynthesizeMouseMove(bool aFromScroll) {
if (!StaticPrefs::layout_reflow_synthMouseMove()) {
return;
}
if (mPaintingSuppressed || !mIsActive || !mPresContext) {
return;
}
if (!mPresContext->IsRoot()) {
if (PresShell* rootPresShell = GetRootPresShell()) {
rootPresShell->SynthesizeMouseMove(aFromScroll);
}
return;
}
if (mMouseLocation == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)) {
return;
}
if (!mSynthMouseMoveEvent.IsPending()) {
RefPtr<nsSynthMouseMoveEvent> ev =
new nsSynthMouseMoveEvent(this, aFromScroll);
GetPresContext()->RefreshDriver()->AddRefreshObserver(
ev, FlushType::Display, "Synthetic mouse move event");
mSynthMouseMoveEvent = std::move(ev);
}
}
static nsView* FindFloatingViewContaining(nsPresContext* aRootPresContext,
nsIWidget* aRootWidget,
const LayoutDeviceIntPoint& aPt) {
nsIFrame* popupFrame = nsLayoutUtils::GetPopupFrameForPoint(
aRootPresContext, aRootWidget, aPt,
nsLayoutUtils::GetPopupFrameForPointFlags::OnlyReturnFramesWithWidgets);
return popupFrame ? popupFrame->GetView() : nullptr;
}
/*
* This finds the first view with a frame that contains the given point in a
* postorder traversal of the view tree, assuming that the point is not in a
* floating view. It assumes that only floating views extend outside the bounds
* of their parents.
*
* This methods should only be called if FindFloatingViewContaining returns
* null.
*
* aPt is relative aRelativeToView with the viewport type
* aRelativeToViewportType. aRelativeToView will always have a frame. If aView
* has a frame then aRelativeToView will be aView. (The reason aRelativeToView
* and aView are separate is because we need to traverse into views without
* frames (ie the inner view of a subdocument frame) but we can only easily
* transform between views using TransformPoint which takes frames.)
*/
static nsView* FindViewContaining(nsView* aRelativeToView,
ViewportType aRelativeToViewportType,
nsView* aView, nsPoint aPt) {
MOZ_ASSERT(aRelativeToView->GetFrame());
if (aView->GetVisibility() == ViewVisibility::Hide) {
return nullptr;
}
nsIFrame* frame = aView->GetFrame();
if (frame) {
if (!frame->PresShell()->IsActive() ||
!frame->IsVisibleConsideringAncestors(
nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY)) {
return nullptr;
}
// We start out in visual coords and then if we cross the zoom boundary we
// become in layout coords. The zoom boundary always occurs in a document
// with IsRootContentDocumentCrossProcess. The root view of such a document
// is outside the zoom boundary and any child view must be inside the zoom
// boundary because we only create views for certain kinds of frames and
// none of them can be between the root frame and the zoom boundary.
bool crossingZoomBoundary = false;
if (aRelativeToViewportType == ViewportType::Visual) {
if (!aRelativeToView->GetParent() ||
aRelativeToView->GetViewManager() !=
aRelativeToView->GetParent()->GetViewManager()) {
if (aRelativeToView->GetFrame()
->PresContext()
->IsRootContentDocumentCrossProcess()) {
crossingZoomBoundary = true;
}
}
}
ViewportType nextRelativeToViewportType = aRelativeToViewportType;
if (crossingZoomBoundary) {
nextRelativeToViewportType = ViewportType::Layout;
}
nsLayoutUtils::TransformResult result = nsLayoutUtils::TransformPoint(
RelativeTo{aRelativeToView->GetFrame(), aRelativeToViewportType},
RelativeTo{frame, nextRelativeToViewportType}, aPt);
if (result != nsLayoutUtils::TRANSFORM_SUCCEEDED) {
return nullptr;
}
// Even though aPt is in visual coordinates until we cross the zoom boundary
// it is valid to compare it to view coords (which are in layout coords)
// because visual coords are the same as layout coords for every view
// outside of the zoom boundary except for the root view of the root content
// document.
// For the root view of the root content document, its bounds don't
// actually correspond to what is visible when we have a
// MobileViewportManager. So we skip the hit test. This is okay because the
// point has already been hit test: 1) if we are the root view in the
// process then the point comes from a real mouse event so it must have been
// over our widget, or 2) if we are the root of a subdocument then
// hittesting against the view of the subdocument frame that contains us
// already happened and succeeded before getting here.
if (!crossingZoomBoundary) {
if (!aView->GetDimensions().Contains(aPt)) {
return nullptr;
}
}
aRelativeToView = aView;
aRelativeToViewportType = nextRelativeToViewportType;
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
nsView* r =
FindViewContaining(aRelativeToView, aRelativeToViewportType, v, aPt);
if (r) return r;
}
return frame ? aView : nullptr;
}
static BrowserBridgeChild* GetChildBrowser(nsView* aView) {
if (!aView) {
return nullptr;
}
nsIFrame* frame = aView->GetFrame();
if (!frame && aView->GetParent()) {
// If frame is null then view is an anonymous inner view, and we want
// the frame from the corresponding outer view.
frame = aView->GetParent()->GetFrame();
}
if (!frame || !frame->GetContent()) {
return nullptr;
}
return BrowserBridgeChild::GetFrom(frame->GetContent());
}
void PresShell::ProcessSynthMouseMoveEvent(bool aFromScroll) {
// If drag session has started, we shouldn't synthesize mousemove event.
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (dragSession) {
mSynthMouseMoveEvent.Forget();
return;
}
// allow new event to be posted while handling this one only if the
// source of the event is a scroll (to prevent infinite reflow loops)
if (aFromScroll) {
mSynthMouseMoveEvent.Forget();
}
nsView* rootView = mViewManager ? mViewManager->GetRootView() : nullptr;
if (mMouseLocation == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) ||
!rootView || !rootView->HasWidget() || !mPresContext) {
mSynthMouseMoveEvent.Forget();
return;
}
NS_ASSERTION(mPresContext->IsRoot(), "Only a root pres shell should be here");
// Hold a ref to ourselves so DispatchEvent won't destroy us (since
// we need to access members after we call DispatchEvent).
RefPtr<PresShell> kungFuDeathGrip(this);
#ifdef DEBUG_MOUSE_LOCATION
printf("[ps=%p]synthesizing mouse move to (%d,%d)\n", this, mMouseLocation.x,
mMouseLocation.y);
#endif
int32_t APD = mPresContext->AppUnitsPerDevPixel();
// We need a widget to put in the event we are going to dispatch so we look
// for a view that has a widget and the mouse location is over. We first look
// for floating views, if there isn't one we use the root view. |view| holds
// that view.
nsView* view = nullptr;
// The appunits per devpixel ratio of |view|.
int32_t viewAPD;
// mRefPoint will be mMouseLocation relative to the widget of |view|, the
// widget we will put in the event we dispatch, in viewAPD appunits
nsPoint refpoint(0, 0);
// We always dispatch the event to the pres shell that contains the view that
// the mouse is over. pointVM is the VM of that pres shell.
nsViewManager* pointVM = nullptr;
if (rootView->GetFrame()) {
view = FindFloatingViewContaining(
mPresContext, rootView->GetWidget(),
LayoutDeviceIntPoint::FromAppUnitsToNearest(
mMouseLocation + rootView->ViewToWidgetOffset(), APD));
}
nsView* pointView = view;
if (!view) {
view = rootView;
if (rootView->GetFrame()) {
pointView = FindViewContaining(rootView, ViewportType::Visual, rootView,
mMouseLocation);
} else {
pointView = rootView;
}
// pointView can be null in situations related to mouse capture
pointVM = (pointView ? pointView : view)->GetViewManager();
refpoint = mMouseLocation + rootView->ViewToWidgetOffset();
viewAPD = APD;
} else {
pointVM = view->GetViewManager();
nsIFrame* frame = view->GetFrame();
NS_ASSERTION(frame, "floating views can't be anonymous");
viewAPD = frame->PresContext()->AppUnitsPerDevPixel();
refpoint = mMouseLocation;
DebugOnly<nsLayoutUtils::TransformResult> result =
nsLayoutUtils::TransformPoint(
RelativeTo{rootView->GetFrame(), ViewportType::Visual},
RelativeTo{frame, ViewportType::Layout}, refpoint);
MOZ_ASSERT(result == nsLayoutUtils::TRANSFORM_SUCCEEDED);
refpoint += view->ViewToWidgetOffset();
}
NS_ASSERTION(view->GetWidget(), "view should have a widget here");
WidgetMouseEvent event(true, eMouseMove, view->GetWidget(),
WidgetMouseEvent::eSynthesized);
// If the last cursor location was set by a synthesized mouse event for tests,
// running test should expect a restyle or a DOM mutation under the cursor may
// cause mouse boundary events in a remote process if the cursor is over a
// remote content. Therefore, the events should not be ignored by
// PresShell::HandleEvent in the remote process. So we need to mark the
// synthesized eMouseMove as "synthesized for tests".
event.mFlags.mIsSynthesizedForTests =
mMouseLocationWasSetBySynthesizedMouseEventForTests;
event.mRefPoint =
LayoutDeviceIntPoint::FromAppUnitsToNearest(refpoint, viewAPD);
event.mButtons = PresShell::sMouseButtons;
// XXX set event.mModifiers ?
// XXX mnakano I think that we should get the latest information from widget.
if (BrowserBridgeChild* bbc = GetChildBrowser(pointView)) {
// If we have a BrowserBridgeChild, we're going to be dispatching this
// mouse event into an OOP iframe of the current document.
event.mLayersId = bbc->GetLayersId();
bbc->SendDispatchSynthesizedMouseEvent(event);
} else if (RefPtr<PresShell> presShell = pointVM->GetPresShell()) {
// Since this gets run in a refresh tick there isn't an InputAPZContext on
// the stack from the nsBaseWidget. We need to simulate one with at least
// the correct target guid, so that the correct callback transform gets
// applied if this event goes to a child process. The input block id is set
// to 0 because this is a synthetic event which doesn't really belong to any
// input block. Same for the APZ response field.
InputAPZContext apzContext(mMouseEventTargetGuid, 0, nsEventStatus_eIgnore);
presShell->DispatchSynthMouseMove(&event);
}
if (!aFromScroll) {
mSynthMouseMoveEvent.Forget();
}
}
/* static */
void PresShell::MarkFramesInListApproximatelyVisible(
const nsDisplayList& aList) {
for (nsDisplayItem* item : aList) {
nsDisplayList* sublist = item->GetChildren();
if (sublist) {
MarkFramesInListApproximatelyVisible(*sublist);
continue;
}
nsIFrame* frame = item->Frame();
MOZ_ASSERT(frame);
if (!frame->TrackingVisibility()) {
continue;
}
// Use the presshell containing the frame.
PresShell* presShell = frame->PresShell();
MOZ_ASSERT(!presShell->AssumeAllFramesVisible());
if (presShell->mApproximatelyVisibleFrames.EnsureInserted(frame)) {
// The frame was added to mApproximatelyVisibleFrames, so increment its
// visible count.
frame->IncApproximateVisibleCount();
}
}
}
/* static */
void PresShell::DecApproximateVisibleCount(
VisibleFrames& aFrames, const Maybe<OnNonvisible>& aNonvisibleAction
/* = Nothing() */) {
for (nsIFrame* frame : aFrames) {
// Decrement the frame's visible count if we're still tracking its
// visibility. (We may not be, if the frame disabled visibility tracking
// after we added it to the visible frames list.)
if (frame->TrackingVisibility()) {
frame->DecApproximateVisibleCount(aNonvisibleAction);
}
}
}
void PresShell::RebuildApproximateFrameVisibilityDisplayList(
const nsDisplayList& aList) {
MOZ_ASSERT(!mApproximateFrameVisibilityVisited, "already visited?");
mApproximateFrameVisibilityVisited = true;
// Remove the entries of the mApproximatelyVisibleFrames hashtable and put
// them in oldApproxVisibleFrames.
VisibleFrames oldApproximatelyVisibleFrames =
std::move(mApproximatelyVisibleFrames);
MarkFramesInListApproximatelyVisible(aList);
DecApproximateVisibleCount(oldApproximatelyVisibleFrames);
}
/* static */
void PresShell::ClearApproximateFrameVisibilityVisited(nsView* aView,
bool aClear) {
nsViewManager* vm = aView->GetViewManager();
if (aClear) {
PresShell* presShell = vm->GetPresShell();
if (!presShell->mApproximateFrameVisibilityVisited) {
presShell->ClearApproximatelyVisibleFramesList();
}
presShell->mApproximateFrameVisibilityVisited = false;
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
ClearApproximateFrameVisibilityVisited(v, v->GetViewManager() != vm);
}
}
void PresShell::ClearApproximatelyVisibleFramesList(
const Maybe<OnNonvisible>& aNonvisibleAction
/* = Nothing() */) {
DecApproximateVisibleCount(mApproximatelyVisibleFrames, aNonvisibleAction);
mApproximatelyVisibleFrames.Clear();
}
void PresShell::MarkFramesInSubtreeApproximatelyVisible(
nsIFrame* aFrame, const nsRect& aRect, bool aRemoveOnly /* = false */) {
MOZ_DIAGNOSTIC_ASSERT(aFrame, "aFrame arg should be a valid frame pointer");
MOZ_ASSERT(aFrame->PresShell() == this, "wrong presshell");
if (aFrame->TrackingVisibility() && aFrame->StyleVisibility()->IsVisible() &&
(!aRemoveOnly ||
aFrame->GetVisibility() == Visibility::ApproximatelyVisible)) {
MOZ_ASSERT(!AssumeAllFramesVisible());
if (mApproximatelyVisibleFrames.EnsureInserted(aFrame)) {
// The frame was added to mApproximatelyVisibleFrames, so increment its
// visible count.
aFrame->IncApproximateVisibleCount();
}
}
nsSubDocumentFrame* subdocFrame = do_QueryFrame(aFrame);
if (subdocFrame) {
PresShell* presShell = subdocFrame->GetSubdocumentPresShellForPainting(
nsSubDocumentFrame::IGNORE_PAINT_SUPPRESSION);
if (presShell && !presShell->AssumeAllFramesVisible()) {
nsRect rect = aRect;
nsIFrame* root = presShell->GetRootFrame();
if (root) {
rect.MoveBy(aFrame->GetOffsetToCrossDoc(root));
} else {
rect.MoveBy(-aFrame->GetContentRectRelativeToSelf().TopLeft());
}
rect = rect.ScaleToOtherAppUnitsRoundOut(
aFrame->PresContext()->AppUnitsPerDevPixel(),
presShell->GetPresContext()->AppUnitsPerDevPixel());
presShell->RebuildApproximateFrameVisibility(&rect);
}
return;
}
nsRect rect = aRect;
nsIScrollableFrame* scrollFrame = do_QueryFrame(aFrame);
if (scrollFrame) {
bool ignoreDisplayPort = false;
if (DisplayPortUtils::IsMissingDisplayPortBaseRect(aFrame->GetContent())) {
// We can properly set the base rect for root scroll frames on top level
// and root content documents. Otherwise the base rect we compute might
// be way too big without the limiting that
// nsHTMLScrollFrame::DecideScrollableLayer does, so we just ignore the
// displayport in that case.
nsPresContext* pc = aFrame->PresContext();
if (scrollFrame->IsRootScrollFrameOfDocument() &&
(pc->IsRootContentDocumentCrossProcess() ||
(pc->IsChrome() && !pc->GetParentPresContext()))) {
nsRect baseRect(
nsPoint(), nsLayoutUtils::CalculateCompositionSizeForFrame(aFrame));
DisplayPortUtils::SetDisplayPortBase(aFrame->GetContent(), baseRect);
} else {
ignoreDisplayPort = true;
}
}
nsRect displayPort;
bool usingDisplayport =
!ignoreDisplayPort &&
DisplayPortUtils::GetDisplayPortForVisibilityTesting(
aFrame->GetContent(), &displayPort);
scrollFrame->NotifyApproximateFrameVisibilityUpdate(!usingDisplayport);
if (usingDisplayport) {
rect = displayPort;
} else {
rect = rect.Intersect(scrollFrame->GetScrollPortRect());
}
rect = scrollFrame->ExpandRectToNearlyVisible(rect);
}
bool preserves3DChildren = aFrame->Extend3DContext();
for (const auto& [list, listID] : aFrame->ChildLists()) {
if (listID == FrameChildListID::Popup) {
// We assume all frames in popups are visible, so we skip them here.
continue;
}
for (nsIFrame* child : list) {
// Note: This assert should be trivially satisfied, just by virtue of how
// nsFrameList and its iterator works (with nullptr being an end-of-list
// sentinel which should terminate the loop). But we do somehow get
// crash reports inside this loop that suggest `child` is null...
MOZ_DIAGNOSTIC_ASSERT(child, "shouldn't have null values in child lists");
nsRect r = rect - child->GetPosition();
if (!r.IntersectRect(r, child->InkOverflowRect())) {
continue;
}
if (child->IsTransformed()) {
// for children of a preserve3d element we just pass down the same dirty
// rect
if (!preserves3DChildren ||
!child->Combines3DTransformWithAncestors()) {
const nsRect overflow = child->InkOverflowRectRelativeToSelf();
nsRect out;
if (nsDisplayTransform::UntransformRect(r, overflow, child, &out)) {
r = out;
} else {
r.SetEmpty();
}
}
}
MarkFramesInSubtreeApproximatelyVisible(child, r, aRemoveOnly);
}
}
}
void PresShell::RebuildApproximateFrameVisibility(
nsRect* aRect, bool aRemoveOnly /* = false */) {
MOZ_ASSERT(!mApproximateFrameVisibilityVisited, "already visited?");
mApproximateFrameVisibilityVisited = true;
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
return;
}
// Remove the entries of the mApproximatelyVisibleFrames hashtable and put
// them in oldApproximatelyVisibleFrames.
VisibleFrames oldApproximatelyVisibleFrames =
std::move(mApproximatelyVisibleFrames);
nsRect vis(nsPoint(0, 0), rootFrame->GetSize());
if (aRect) {
vis = *aRect;
}
// If we are in-process root but not the top level content, we need to take
// the intersection with the iframe visible rect.
if (mPresContext->IsRootContentDocumentInProcess() &&
!mPresContext->IsRootContentDocumentCrossProcess()) {
// There are two possibilities that we can't get the iframe's visible
// rect other than the iframe is out side of ancestors' display ports.
// a) the BrowserChild is being torn down
// b) the visible rect hasn't been delivered the BrowserChild
// In both cases we consider the visible rect is empty.
Maybe<nsRect> visibleRect;
if (BrowserChild* browserChild = BrowserChild::GetFrom(this)) {
visibleRect = browserChild->GetVisibleRect();
}
vis = vis.Intersect(visibleRect.valueOr(nsRect()));
}
MarkFramesInSubtreeApproximatelyVisible(rootFrame, vis, aRemoveOnly);
DecApproximateVisibleCount(oldApproximatelyVisibleFrames);
}
void PresShell::UpdateApproximateFrameVisibility() {
DoUpdateApproximateFrameVisibility(/* aRemoveOnly = */ false);
}
void PresShell::DoUpdateApproximateFrameVisibility(bool aRemoveOnly) {
MOZ_ASSERT(
!mPresContext || mPresContext->IsRootContentDocumentInProcess(),
"Updating approximate frame visibility on a non-root content document?");
mUpdateApproximateFrameVisibilityEvent.Revoke();
if (mHaveShutDown || mIsDestroying) {
return;
}
// call update on that frame
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
ClearApproximatelyVisibleFramesList(Some(OnNonvisible::DiscardImages));
return;
}
RebuildApproximateFrameVisibility(/* aRect = */ nullptr, aRemoveOnly);
ClearApproximateFrameVisibilityVisited(rootFrame->GetView(), true);
#ifdef DEBUG_FRAME_VISIBILITY_DISPLAY_LIST
// This can be used to debug the frame walker by comparing beforeFrameList
// and mApproximatelyVisibleFrames in RebuildFrameVisibilityDisplayList to see
// if they produce the same results (mApproximatelyVisibleFrames holds the
// frames the display list thinks are visible, beforeFrameList holds the
// frames the frame walker thinks are visible).
nsDisplayListBuilder builder(
rootFrame, nsDisplayListBuilderMode::FRAME_VISIBILITY, false);
nsRect updateRect(nsPoint(0, 0), rootFrame->GetSize());
nsIFrame* rootScroll = GetRootScrollFrame();
if (rootScroll) {
nsIContent* content = rootScroll->GetContent();
if (content) {
Unused << nsLayoutUtils::GetDisplayPortForVisibilityTesting(
content, &updateRect, RelativeTo::ScrollFrame);
}
if (IgnoringViewportScrolling()) {
builder.SetIgnoreScrollFrame(rootScroll);
}
}
builder.IgnorePaintSuppression();
builder.EnterPresShell(rootFrame);
nsDisplayList list;
rootFrame->BuildDisplayListForStackingContext(&builder, updateRect, &list);
builder.LeavePresShell(rootFrame, &list);
RebuildApproximateFrameVisibilityDisplayList(list);
ClearApproximateFrameVisibilityVisited(rootFrame->GetView(), true);
list.DeleteAll(&builder);
#endif
}
bool PresShell::AssumeAllFramesVisible() {
if (!StaticPrefs::layout_framevisibility_enabled() || !mPresContext ||
!mDocument) {
return true;
}
// We assume all frames are visible in print, print preview, chrome, and
// resource docs and don't keep track of them.
if (mPresContext->Type() == nsPresContext::eContext_PrintPreview ||
mPresContext->Type() == nsPresContext::eContext_Print ||
mPresContext->IsChrome() || mDocument->IsResourceDoc()) {
return true;
}
// If we're assuming all frames are visible in the top level content
// document, we need to in subdocuments as well. Otherwise we can get in a
// situation where things like animations won't work in subdocuments because
// their frames appear not to be visible, since we won't schedule an image
// visibility update if the top level content document is assuming all
// frames are visible.
//
// Note that it's not safe to call IsRootContentDocumentInProcess() if we're
// currently being destroyed, so we have to check that first.
if (!mHaveShutDown && !mIsDestroying &&
!mPresContext->IsRootContentDocumentInProcess()) {
nsPresContext* presContext =
mPresContext->GetInProcessRootContentDocumentPresContext();
if (presContext && presContext->PresShell()->AssumeAllFramesVisible()) {
return true;
}
}
return false;
}
void PresShell::ScheduleApproximateFrameVisibilityUpdateSoon() {
if (AssumeAllFramesVisible()) {
return;
}
if (!mPresContext) {
return;
}
nsRefreshDriver* refreshDriver = mPresContext->RefreshDriver();
if (!refreshDriver) {
return;
}
// Ask the refresh driver to update frame visibility soon.
refreshDriver->ScheduleFrameVisibilityUpdate();
}
void PresShell::ScheduleApproximateFrameVisibilityUpdateNow() {
if (AssumeAllFramesVisible()) {
return;
}
if (!mPresContext->IsRootContentDocumentInProcess()) {
nsPresContext* presContext =
mPresContext->GetInProcessRootContentDocumentPresContext();
if (!presContext) return;
MOZ_ASSERT(presContext->IsRootContentDocumentInProcess(),
"Didn't get a root prescontext from "
"GetInProcessRootContentDocumentPresContext?");
presContext->PresShell()->ScheduleApproximateFrameVisibilityUpdateNow();
return;
}
if (mHaveShutDown || mIsDestroying) {
return;
}
if (mUpdateApproximateFrameVisibilityEvent.IsPending()) {
return;
}
RefPtr<nsRunnableMethod<PresShell>> event =
NewRunnableMethod("PresShell::UpdateApproximateFrameVisibility", this,
&PresShell::UpdateApproximateFrameVisibility);
nsresult rv = mDocument->Dispatch(do_AddRef(event));
if (NS_SUCCEEDED(rv)) {
mUpdateApproximateFrameVisibilityEvent = std::move(event);
}
}
void PresShell::EnsureFrameInApproximatelyVisibleList(nsIFrame* aFrame) {
if (!aFrame->TrackingVisibility()) {
return;
}
if (AssumeAllFramesVisible()) {
aFrame->IncApproximateVisibleCount();
return;
}
#ifdef DEBUG
// Make sure it's in this pres shell.
nsCOMPtr<nsIContent> content = aFrame->GetContent();
if (content) {
PresShell* presShell = content->OwnerDoc()->GetPresShell();
MOZ_ASSERT(!presShell || presShell == this, "wrong shell");
}
#endif
if (mApproximatelyVisibleFrames.EnsureInserted(aFrame)) {
// We inserted a new entry.
aFrame->IncApproximateVisibleCount();
}
}
void PresShell::RemoveFrameFromApproximatelyVisibleList(nsIFrame* aFrame) {
#ifdef DEBUG
// Make sure it's in this pres shell.
nsCOMPtr<nsIContent> content = aFrame->GetContent();
if (content) {
PresShell* presShell = content->OwnerDoc()->GetPresShell();
MOZ_ASSERT(!presShell || presShell == this, "wrong shell");
}
#endif
if (AssumeAllFramesVisible()) {
MOZ_ASSERT(mApproximatelyVisibleFrames.Count() == 0,
"Shouldn't have any frames in the table");
return;
}
if (mApproximatelyVisibleFrames.EnsureRemoved(aFrame) &&
aFrame->TrackingVisibility()) {
// aFrame was in the hashtable, and we're still tracking its visibility,
// so we need to decrement its visible count.
aFrame->DecApproximateVisibleCount();
}
}
void PresShell::PaintAndRequestComposite(nsView* aView, PaintFlags aFlags) {
if (!mIsActive) {
return;
}
WindowRenderer* renderer = aView->GetWidget()->GetWindowRenderer();
NS_ASSERTION(renderer, "Must be in paint event");
if (renderer->AsFallback()) {
// The fallback renderer doesn't do any retaining, so we
// just need to notify the view and widget that we're invalid, and
// we'll do a paint+composite from the PaintWindow callback.
GetViewManager()->InvalidateView(aView);
return;
}
// Otherwise we're a retained WebRenderLayerManager, so we want to call
// Paint to update with any changes and push those to WR.
PaintInternalFlags flags = PaintInternalFlags::None;
if (aFlags & PaintFlags::PaintSyncDecodeImages) {
flags |= PaintInternalFlags::PaintSyncDecodeImages;
}
PaintInternal(aView, flags);
}
void PresShell::SyncPaintFallback(nsView* aView) {
if (!mIsActive) {
return;
}
WindowRenderer* renderer = aView->GetWidget()->GetWindowRenderer();
NS_ASSERTION(renderer->AsFallback(),
"Can't do Sync paint for remote renderers");
if (!renderer->AsFallback()) {
return;
}
PaintInternal(aView, PaintInternalFlags::PaintComposite);
GetPresContext()->NotifyDidPaintForSubtree();
}
void PresShell::PaintInternal(nsView* aViewToPaint, PaintInternalFlags aFlags) {
nsCString url;
nsIURI* uri = mDocument->GetDocumentURI();
Document* contentRoot = GetPrimaryContentDocument();
if (contentRoot) {
uri = contentRoot->GetDocumentURI();
}
url = uri ? uri->GetSpecOrDefault() : "N/A"_ns;
AUTO_PROFILER_LABEL_DYNAMIC_NSCSTRING_RELEVANT_FOR_JS(
"Paint", GRAPHICS, Substring(url, std::min(size_t(128), url.Length())));
Maybe<js::AutoAssertNoContentJS> nojs;
// On Android, Flash can call into content JS during painting, so we can't
// assert there. However, we don't rely on this assertion on Android because
// we don't paint while JS is running.
#if !defined(MOZ_WIDGET_ANDROID)
if (!(aFlags & PaintInternalFlags::PaintComposite)) {
// We need to allow content JS when the flag is set since we may trigger
// MozAfterPaint events in content in those cases.
nojs.emplace(dom::danger::GetJSContext());
}
#endif
NS_ASSERTION(!mIsDestroying, "painting a destroyed PresShell");
NS_ASSERTION(aViewToPaint, "null view");
MOZ_ASSERT(!mApproximateFrameVisibilityVisited, "Should have been cleared");
if (!mIsActive) {
return;
}
if (StaticPrefs::apz_keyboard_enabled_AtStartup()) {
// Update the focus target for async keyboard scrolling. This will be
// forwarded to APZ by nsDisplayList::PaintRoot. We need to to do this
// before we enter the paint phase because dispatching eVoid events can
// cause layout to happen.
mAPZFocusTarget = FocusTarget(this, mAPZFocusSequenceNumber);
}
nsPresContext* presContext = GetPresContext();
AUTO_LAYOUT_PHASE_ENTRY_POINT(presContext, Paint);
nsIFrame* frame = aViewToPaint->GetFrame();
WindowRenderer* renderer = aViewToPaint->GetWidget()->GetWindowRenderer();
NS_ASSERTION(renderer, "Must be in paint event");
WebRenderLayerManager* layerManager = renderer->AsWebRender();
// Whether or not we should set first paint when painting is suppressed
// is debatable. For now we'll do it because B2G relied on first paint
// to configure the viewport and we only want to do that when we have
// real content to paint. See Bug 798245
if (mIsFirstPaint && !mPaintingSuppressed) {
MOZ_LOG(gLog, LogLevel::Debug,
("PresShell::Paint, first paint, this=%p", this));
if (layerManager) {
layerManager->SetIsFirstPaint();
}
mIsFirstPaint = false;
}
if (!renderer->BeginTransaction(url)) {
return;
}
// Send an updated focus target with this transaction. Be sure to do this
// before we paint in the case this is an empty transaction.
if (layerManager) {
layerManager->SetFocusTarget(mAPZFocusTarget);
}
if (frame) {
if (!(aFlags & PaintInternalFlags::PaintSyncDecodeImages) &&
!frame->HasAnyStateBits(NS_FRAME_UPDATE_LAYER_TREE)) {
if (layerManager) {
layerManager->SetTransactionIdAllocator(presContext->RefreshDriver());
}
if (renderer->EndEmptyTransaction(
(aFlags & PaintInternalFlags::PaintComposite)
? WindowRenderer::END_DEFAULT
: WindowRenderer::END_NO_COMPOSITE)) {
return;
}
}
frame->RemoveStateBits(NS_FRAME_UPDATE_LAYER_TREE);
}
nscolor bgcolor = ComputeBackstopColor(aViewToPaint);
PaintFrameFlags flags =
PaintFrameFlags::WidgetLayers | PaintFrameFlags::ExistingTransaction;
// We force sync-decode for printing / print-preview (printing already does
// this from nsPageSequenceFrame::PrintNextSheet).
// We also force sync-decoding via pref for reftests.
if (aFlags & PaintInternalFlags::PaintSyncDecodeImages ||
mDocument->IsStaticDocument() ||
StaticPrefs::image_testing_decode_sync_enabled()) {
flags |= PaintFrameFlags::SyncDecodeImages;
}
if (renderer->GetBackendType() == layers::LayersBackend::LAYERS_WR) {
flags |= PaintFrameFlags::ForWebRender;
}
if (frame) {
// We can paint directly into the widget using its layer manager.
nsLayoutUtils::PaintFrame(nullptr, frame, nsRegion(), bgcolor,
nsDisplayListBuilderMode::Painting, flags);
return;
}
bgcolor = NS_ComposeColors(bgcolor, mCanvasBackground.mViewportColor);
if (renderer->GetBackendType() == layers::LayersBackend::LAYERS_WR) {
LayoutDeviceRect bounds = LayoutDeviceRect::FromAppUnits(
presContext->GetVisibleArea(), presContext->AppUnitsPerDevPixel());
WebRenderBackgroundData data(wr::ToLayoutRect(bounds),
wr::ToColorF(ToDeviceColor(bgcolor)));
WrFiltersHolder wrFilters;
layerManager->SetTransactionIdAllocator(presContext->RefreshDriver());
layerManager->EndTransactionWithoutLayer(nullptr, nullptr,
std::move(wrFilters), &data, 0);
return;
}
FallbackRenderer* fallback = renderer->AsFallback();
MOZ_ASSERT(fallback);
if (aFlags & PaintInternalFlags::PaintComposite) {
nsIntRect bounds = presContext->GetVisibleArea().ToOutsidePixels(
presContext->AppUnitsPerDevPixel());
fallback->EndTransactionWithColor(bounds, ToDeviceColor(bgcolor));
}
}
// static
void PresShell::SetCapturingContent(nsIContent* aContent, CaptureFlags aFlags,
WidgetEvent* aEvent) {
// If capture was set for pointer lock, don't unlock unless we are coming
// out of pointer lock explicitly.
if (!aContent && sCapturingContentInfo.mPointerLock &&
!(aFlags & CaptureFlags::PointerLock)) {
return;
}
sCapturingContentInfo.mContent = nullptr;
sCapturingContentInfo.mRemoteTarget = nullptr;
// only set capturing content if allowed or the
// CaptureFlags::IgnoreAllowedState or CaptureFlags::PointerLock are used.
if ((aFlags & CaptureFlags::IgnoreAllowedState) ||
sCapturingContentInfo.mAllowed || (aFlags & CaptureFlags::PointerLock)) {
if (aContent) {
sCapturingContentInfo.mContent = aContent;
}
if (aEvent) {
MOZ_ASSERT(XRE_IsParentProcess());
MOZ_ASSERT(aEvent->mMessage == eMouseDown);
MOZ_ASSERT(aEvent->HasBeenPostedToRemoteProcess());
sCapturingContentInfo.mRemoteTarget =
BrowserParent::GetLastMouseRemoteTarget();
MOZ_ASSERT(sCapturingContentInfo.mRemoteTarget);
}
// CaptureFlags::PointerLock is the same as
// CaptureFlags::RetargetToElement & CaptureFlags::IgnoreAllowedState.
sCapturingContentInfo.mRetargetToElement =
!!(aFlags & CaptureFlags::RetargetToElement) ||
!!(aFlags & CaptureFlags::PointerLock);
sCapturingContentInfo.mPreventDrag =
!!(aFlags & CaptureFlags::PreventDragStart);
sCapturingContentInfo.mPointerLock = !!(aFlags & CaptureFlags::PointerLock);
}
}
nsIContent* PresShell::GetCurrentEventContent() {
if (mCurrentEventContent &&
mCurrentEventContent->GetComposedDoc() != mDocument) {
mCurrentEventContent = nullptr;
mCurrentEventFrame = nullptr;
}
return mCurrentEventContent;
}
nsIFrame* PresShell::GetCurrentEventFrame() {
if (MOZ_UNLIKELY(mIsDestroying)) {
return nullptr;
}
// GetCurrentEventContent() makes sure the content is still in the
// same document that this pres shell belongs to. If not, then the
// frame shouldn't get an event, nor should we even assume its safe
// to try and find the frame.
nsIContent* content = GetCurrentEventContent();
if (!mCurrentEventFrame && content) {
mCurrentEventFrame = content->GetPrimaryFrame();
MOZ_ASSERT(!mCurrentEventFrame ||
mCurrentEventFrame->PresContext()->GetPresShell() == this);
}
return mCurrentEventFrame;
}
already_AddRefed<nsIContent> PresShell::GetEventTargetContent(
WidgetEvent* aEvent) {
nsCOMPtr<nsIContent> content = GetCurrentEventContent();
if (!content) {
nsIFrame* currentEventFrame = GetCurrentEventFrame();
if (currentEventFrame) {
currentEventFrame->GetContentForEvent(aEvent, getter_AddRefs(content));
NS_ASSERTION(!content || content->GetComposedDoc() == mDocument,
"handing out content from a different doc");
}
}
return content.forget();
}
void PresShell::PushCurrentEventInfo(nsIFrame* aFrame, nsIContent* aContent) {
if (mCurrentEventFrame || mCurrentEventContent) {
mCurrentEventFrameStack.InsertElementAt(0, mCurrentEventFrame);
mCurrentEventContentStack.InsertObjectAt(mCurrentEventContent, 0);
}
mCurrentEventFrame = aFrame;
mCurrentEventContent = aContent;
}
void PresShell::PopCurrentEventInfo() {
mCurrentEventFrame = nullptr;
mCurrentEventContent = nullptr;
if (0 != mCurrentEventFrameStack.Length()) {
mCurrentEventFrame = mCurrentEventFrameStack.ElementAt(0);
mCurrentEventFrameStack.RemoveElementAt(0);
mCurrentEventContent = mCurrentEventContentStack.ObjectAt(0);
mCurrentEventContentStack.RemoveObjectAt(0);
// Don't use it if it has moved to a different document.
if (mCurrentEventContent &&
mCurrentEventContent->GetComposedDoc() != mDocument) {
mCurrentEventContent = nullptr;
mCurrentEventFrame = nullptr;
}
}
}
// static
bool PresShell::EventHandler::InZombieDocument(nsIContent* aContent) {
// If a content node points to a null document, or the document is not
// attached to a window, then it is possibly in a zombie document,
// about to be replaced by a newly loading document.
// Such documents cannot handle DOM events.
// It might actually be in a node not attached to any document,
// in which case there is not parent presshell to retarget it to.
Document* doc = aContent->GetComposedDoc();
return !doc || !doc->GetWindow();
}
already_AddRefed<nsPIDOMWindowOuter> PresShell::GetRootWindow() {
nsCOMPtr<nsPIDOMWindowOuter> window = mDocument->GetWindow();
if (window) {
nsCOMPtr<nsPIDOMWindowOuter> rootWindow = window->GetPrivateRoot();
NS_ASSERTION(rootWindow, "nsPIDOMWindow::GetPrivateRoot() returns NULL");
return rootWindow.forget();
}
// If we don't have DOM window, we're zombie, we should find the root window
// with our parent shell.
RefPtr<PresShell> parentPresShell = GetParentPresShellForEventHandling();
NS_ENSURE_TRUE(parentPresShell, nullptr);
return parentPresShell->GetRootWindow();
}
already_AddRefed<nsPIDOMWindowOuter>
PresShell::GetFocusedDOMWindowInOurWindow() {
nsCOMPtr<nsPIDOMWindowOuter> rootWindow = GetRootWindow();
NS_ENSURE_TRUE(rootWindow, nullptr);
nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
nsFocusManager::GetFocusedDescendant(rootWindow,
nsFocusManager::eIncludeAllDescendants,
getter_AddRefs(focusedWindow));
return focusedWindow.forget();
}
already_AddRefed<nsIContent> PresShell::GetFocusedContentInOurWindow() const {
nsFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && mDocument) {
RefPtr<Element> focusedElement;
fm->GetFocusedElementForWindow(mDocument->GetWindow(), false, nullptr,
getter_AddRefs(focusedElement));
return focusedElement.forget();
}
return nullptr;
}
already_AddRefed<PresShell> PresShell::GetParentPresShellForEventHandling() {
if (!mPresContext) {
return nullptr;
}
// Now, find the parent pres shell and send the event there
RefPtr<nsDocShell> docShell = mPresContext->GetDocShell();
if (!docShell) {
docShell = mForwardingContainer.get();
}
// Might have gone away, or never been around to start with
if (!docShell) {
return nullptr;
}
BrowsingContext* bc = docShell->GetBrowsingContext();
if (!bc) {
return nullptr;
}
RefPtr<BrowsingContext> parentBC;
if (XRE_IsParentProcess()) {
parentBC = bc->Canonical()->GetParentCrossChromeBoundary();
} else {
parentBC = bc->GetParent();
}
RefPtr<nsIDocShell> parentDocShell =
parentBC ? parentBC->GetDocShell() : nullptr;
if (!parentDocShell) {
return nullptr;
}
RefPtr<PresShell> parentPresShell = parentDocShell->GetPresShell();
return parentPresShell.forget();
}
nsresult PresShell::EventHandler::RetargetEventToParent(
WidgetGUIEvent* aGUIEvent, nsEventStatus* aEventStatus) {
// Send this events straight up to the parent pres shell.
// We do this for keystroke events in zombie documents or if either a frame
// or a root content is not present.
// That way at least the UI key bindings can work.
RefPtr<PresShell> parentPresShell = GetParentPresShellForEventHandling();
NS_ENSURE_TRUE(parentPresShell, NS_ERROR_FAILURE);
// Fake the event as though it's from the parent pres shell's root frame.
return parentPresShell->HandleEvent(parentPresShell->GetRootFrame(),
aGUIEvent, true, aEventStatus);
}
void PresShell::DisableNonTestMouseEvents(bool aDisable) {
sDisableNonTestMouseEvents = aDisable;
}
bool PresShell::MouseLocationWasSetBySynthesizedMouseEventForTests() const {
if (!mPresContext) {
return false;
}
if (mPresContext->IsRoot()) {
return mMouseLocationWasSetBySynthesizedMouseEventForTests;
}
PresShell* rootPresShell = GetRootPresShell();
return rootPresShell &&
rootPresShell->mMouseLocationWasSetBySynthesizedMouseEventForTests;
}
nsPoint PresShell::GetEventLocation(const WidgetMouseEvent& aEvent) const {
nsIFrame* rootFrame = GetRootFrame();
if (rootFrame) {
RelativeTo relativeTo{rootFrame};
if (rootFrame->PresContext()->IsRootContentDocumentCrossProcess()) {
relativeTo.mViewportType = ViewportType::Visual;
}
return nsLayoutUtils::GetEventCoordinatesRelativeTo(&aEvent, relativeTo);
}
nsView* rootView = mViewManager->GetRootView();
return nsLayoutUtils::TranslateWidgetToView(mPresContext, aEvent.mWidget,
aEvent.mRefPoint, rootView);
}
void PresShell::RecordPointerLocation(WidgetGUIEvent* aEvent) {
if (!mPresContext) {
return;
}
if (!mPresContext->IsRoot()) {
PresShell* rootPresShell = GetRootPresShell();
if (rootPresShell) {
rootPresShell->RecordPointerLocation(aEvent);
}
return;
}
if ((aEvent->mMessage == eMouseMove &&
aEvent->AsMouseEvent()->mReason == WidgetMouseEvent::eReal) ||
aEvent->mMessage == eMouseEnterIntoWidget ||
aEvent->mMessage == eMouseDown || aEvent->mMessage == eMouseUp) {
mMouseLocation = GetEventLocation(*aEvent->AsMouseEvent());
mMouseEventTargetGuid = InputAPZContext::GetTargetLayerGuid();
mMouseLocationWasSetBySynthesizedMouseEventForTests =
aEvent->mFlags.mIsSynthesizedForTests;
#ifdef DEBUG_MOUSE_LOCATION
if (aEvent->mMessage == eMouseEnterIntoWidget) {
printf("[ps=%p]got mouse enter for %p\n", this, aEvent->mWidget);
}
printf("[ps=%p]setting mouse location to (%d,%d)\n", this, mMouseLocation.x,
mMouseLocation.y);
#endif
if (aEvent->mMessage == eMouseEnterIntoWidget) {
SynthesizeMouseMove(false);
}
} else if (aEvent->mMessage == eMouseExitFromWidget) {
// Although we only care about the mouse moving into an area for which this
// pres shell doesn't receive mouse move events, we don't check which widget
// the mouse exit was for since this seems to vary by platform. Hopefully
// this won't matter at all since we'll get the mouse move or enter after
// the mouse exit when the mouse moves from one of our widgets into another.
mMouseLocation = nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
mMouseEventTargetGuid = InputAPZContext::GetTargetLayerGuid();
mMouseLocationWasSetBySynthesizedMouseEventForTests =
aEvent->mFlags.mIsSynthesizedForTests;
#ifdef DEBUG_MOUSE_LOCATION
printf("[ps=%p]got mouse exit for %p\n", this, aEvent->mWidget);
printf("[ps=%p]clearing mouse location\n", this);
#endif
} else if ((aEvent->mMessage == ePointerMove &&
aEvent->AsMouseEvent()->mReason == WidgetMouseEvent::eReal) ||
aEvent->mMessage == ePointerDown ||
aEvent->mMessage == ePointerUp) {
// TODO: instead, encapsulate `mMouseLocation` and
// `mLastOverWindowPointerLocation` in a struct.
mLastOverWindowPointerLocation = GetEventLocation(*aEvent->AsMouseEvent());
}
}
void PresShell::nsSynthMouseMoveEvent::Revoke() {
if (mPresShell) {
mPresShell->GetPresContext()->RefreshDriver()->RemoveRefreshObserver(
this, FlushType::Display);
mPresShell = nullptr;
}
}
// static
nsIFrame* PresShell::EventHandler::GetNearestFrameContainingPresShell(
PresShell* aPresShell) {
nsViewManager* vm = aPresShell->GetViewManager();
if (!vm) {
return nullptr;
}
nsView* view = vm->GetRootView();
while (view && !view->GetFrame()) {
view = view->GetParent();
}
nsIFrame* frame = nullptr;
if (view) {
frame = view->GetFrame();
}
return frame;
}
static CallState FlushThrottledStyles(Document& aDocument) {
PresShell* presShell = aDocument.GetPresShell();
if (presShell && presShell->IsVisible()) {
if (nsPresContext* presContext = presShell->GetPresContext()) {
presContext->RestyleManager()->UpdateOnlyAnimationStyles();
}
}
aDocument.EnumerateSubDocuments(FlushThrottledStyles);
return CallState::Continue;
}
bool PresShell::CanDispatchEvent(const WidgetGUIEvent* aEvent) const {
bool rv =
mPresContext && !mHaveShutDown && nsContentUtils::IsSafeToRunScript();
if (aEvent) {
rv &= (aEvent && aEvent->mWidget && !aEvent->mWidget->Destroyed());
}
return rv;
}
/* static */
PresShell* PresShell::GetShellForEventTarget(nsIFrame* aFrame,
nsIContent* aContent) {
if (aFrame) {
return aFrame->PresShell();
}
if (aContent) {
Document* doc = aContent->GetComposedDoc();
if (!doc) {
return nullptr;
}
return doc->GetPresShell();
}
return nullptr;
}
/* static */
PresShell* PresShell::GetShellForTouchEvent(WidgetGUIEvent* aEvent) {
switch (aEvent->mMessage) {
case eTouchMove:
case eTouchCancel:
case eTouchEnd: {
// get the correct shell to dispatch to
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
for (dom::Touch* touch : touchEvent->mTouches) {
if (!touch) {
return nullptr;
}
RefPtr<dom::Touch> oldTouch =
TouchManager::GetCapturedTouch(touch->Identifier());
if (!oldTouch) {
return nullptr;
}
nsIContent* const content =
nsIContent::FromEventTargetOrNull(oldTouch->GetTarget());
if (!content) {
return nullptr;
}
if (PresShell* const presShell = content->OwnerDoc()->GetPresShell()) {
return presShell;
}
}
return nullptr;
}
default:
return nullptr;
}
}
nsresult PresShell::HandleEvent(nsIFrame* aFrameForPresShell,
WidgetGUIEvent* aGUIEvent,
bool aDontRetargetEvents,
nsEventStatus* aEventStatus) {
MOZ_ASSERT(aGUIEvent);
// Running tests must not expect that some mouse boundary events are fired
// when something occurs in the parent process, e.g., when a popup is
// opened/closed at the last mouse cursor position in the parent process (the
// position may be different from the position which stored in this process).
// Therefore, let's ignore synthesized mouse events coming form another
// process if and only if they are not caused by the API.
if (aGUIEvent->CameFromAnotherProcess() && XRE_IsContentProcess() &&
!aGUIEvent->mFlags.mIsSynthesizedForTests &&
MouseLocationWasSetBySynthesizedMouseEventForTests()) {
switch (aGUIEvent->mMessage) {
// Synthesized eMouseMove will case mouse boundary events like mouseover,
// mouseout, and :hover state is changed at dispatching the events.
case eMouseMove:
// eMouseExitFromWidget comes from the parent process if the cursor
// crosses a puppet widget boundary. Then, the event will be handled as a
// synthesized eMouseMove in this process and may cause unexpected
// `mouseout` and `mouseleave`.
case eMouseExitFromWidget:
// eMouseEnterIntoWidget causes updating the hover state under the event
// position which may be different from the last cursor position
// synthesized in this process.
case eMouseEnterIntoWidget:
if (!aGUIEvent->AsMouseEvent()->IsReal()) {
return NS_OK;
}
break;
default:
break;
}
}
// Here we are granting some delays to ensure that user input events are
// created while the page content may not be visible to the user are not
// processed.
// The main purpose of this is to avoid user inputs are handled in the
// new document where as the user inputs were originally targeting some
// content in the old document.
if (!CanHandleUserInputEvents(aGUIEvent)) {
return NS_OK;
}
if (mPresContext) {
switch (aGUIEvent->mMessage) {
case eMouseMove:
if (!aGUIEvent->AsMouseEvent()->IsReal()) {
break;
}
[[fallthrough]];
case eMouseDown:
case eMouseUp: {
// We should flush pending mousemove event now because some mouse
// boundary events which should've already been dispatched before a user
// input may have not been dispatched. E.g., if a mousedown event
// listener removed or appended an element under the cursor and mouseup
// event comes immediately after that, mouseover or mouseout may have
// not been dispatched on the new element yet.
// XXX If eMouseMove is not propery dispatched before eMouseDown and
// a `mousedown` event listener removes the event target or its
// ancestor, eMouseOver will be dispatched between eMouseDown and
// eMouseUp. That could cause unexpected behavior if a `mouseover`
// event listener assumes it's always disptached before `mousedown`.
// However, we're not sure whether it could happen with users' input.
// FIXME: Perhaps, we need to do this for all events which are directly
// caused by user input, e.g., eKeyDown, etc.
RefPtr<PresShell> rootPresShell =
mPresContext->IsRoot() ? this : GetRootPresShell();
if (rootPresShell && rootPresShell->mSynthMouseMoveEvent.IsPending()) {
AutoWeakFrame frameForPresShellWeak(aFrameForPresShell);
RefPtr<nsSynthMouseMoveEvent> synthMouseMoveEvent =
rootPresShell->mSynthMouseMoveEvent.get();
synthMouseMoveEvent->Run();
if (IsDestroying()) {
return NS_OK;
}
// XXX If the frame or "this" is reframed, it might be better to
// recompute the frame. However, it could treat the user input on
// unexpected element. Therefore, we should not do that until we'd
// get a bug report caused by that.
if (MOZ_UNLIKELY(!frameForPresShellWeak.IsAlive())) {
return NS_OK;
}
}
break;
}
default:
break;
}
}
EventHandler eventHandler(*this);
return eventHandler.HandleEvent(aFrameForPresShell, aGUIEvent,
aDontRetargetEvents, aEventStatus);
}
nsresult PresShell::EventHandler::HandleEvent(nsIFrame* aFrameForPresShell,
WidgetGUIEvent* aGUIEvent,
bool aDontRetargetEvents,
nsEventStatus* aEventStatus) {
MOZ_ASSERT(aGUIEvent);
MOZ_DIAGNOSTIC_ASSERT(aGUIEvent->IsTrusted());
MOZ_ASSERT(aEventStatus);
NS_ASSERTION(aFrameForPresShell, "aFrameForPresShell should be not null");
// Update the latest focus sequence number with this new sequence number;
// the next transasction that gets sent to the compositor will carry this over
if (mPresShell->mAPZFocusSequenceNumber < aGUIEvent->mFocusSequenceNumber) {
mPresShell->mAPZFocusSequenceNumber = aGUIEvent->mFocusSequenceNumber;
}
if (mPresShell->IsDestroying() ||
(PresShell::sDisableNonTestMouseEvents &&
!aGUIEvent->mFlags.mIsSynthesizedForTests &&
aGUIEvent->HasMouseEventMessage())) {
return NS_OK;
}
mPresShell->RecordPointerLocation(aGUIEvent);
if (MaybeHandleEventWithAccessibleCaret(aFrameForPresShell, aGUIEvent,
aEventStatus)) {
// Handled by AccessibleCaretEventHub.
return NS_OK;
}
if (MaybeDiscardEvent(aGUIEvent)) {
// Cannot handle the event for now.
return NS_OK;
}
if (!aDontRetargetEvents) {
// If aGUIEvent should be handled in another PresShell, we should call its
// HandleEvent() and do nothing here.
nsresult rv = NS_OK;
if (MaybeHandleEventWithAnotherPresShell(aFrameForPresShell, aGUIEvent,
aEventStatus, &rv)) {
// Handled by another PresShell or nobody can handle the event.
return rv;
}
}
if (MaybeDiscardOrDelayKeyboardEvent(aGUIEvent)) {
// The event is discarded or put into the delayed event queue.
return NS_OK;
}
if (aGUIEvent->IsUsingCoordinates()) {
return HandleEventUsingCoordinates(aFrameForPresShell, aGUIEvent,
aEventStatus, aDontRetargetEvents);
}
// Activation events need to be dispatched even if no frame was found, since
// we don't want the focus to be out of sync.
if (!aFrameForPresShell) {
if (!NS_EVENT_NEEDS_FRAME(aGUIEvent)) {
// Push nullptr for both current event target content and frame since
// there is no frame but the event does not require a frame.
AutoCurrentEventInfoSetter eventInfoSetter(*this);
return HandleEventWithCurrentEventInfo(aGUIEvent, aEventStatus, true,
nullptr);
}
if (aGUIEvent->HasKeyEventMessage()) {
// Keypress events in new blank tabs should not be completely thrown away.
// Retarget them -- the parent chrome shell might make use of them.
return RetargetEventToParent(aGUIEvent, aEventStatus);
}
return NS_OK;
}
if (aGUIEvent->IsTargetedAtFocusedContent()) {
return HandleEventAtFocusedContent(aGUIEvent, aEventStatus);
}
return HandleEventWithFrameForPresShell(aFrameForPresShell, aGUIEvent,
aEventStatus);
}
nsresult PresShell::EventHandler::HandleEventUsingCoordinates(
nsIFrame* aFrameForPresShell, WidgetGUIEvent* aGUIEvent,
nsEventStatus* aEventStatus, bool aDontRetargetEvents) {
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aGUIEvent->IsUsingCoordinates());
MOZ_ASSERT(aEventStatus);
// Flush pending notifications to handle the event with the latest layout.
// But if it causes destroying the frame for mPresShell, stop handling the
// event. (why?)
AutoWeakFrame weakFrame(aFrameForPresShell);
MaybeFlushPendingNotifications(aGUIEvent);
if (!weakFrame.IsAlive()) {
*aEventStatus = nsEventStatus_eIgnore;
return NS_OK;
}
// XXX Retrieving capturing content here. However, some of the following
// methods allow to run script. So, isn't it possible the capturing
// content outdated?
nsCOMPtr<nsIContent> capturingContent =
EventHandler::GetCapturingContentFor(aGUIEvent);
if (GetDocument() && aGUIEvent->mClass == eTouchEventClass) {
PointerLockManager::Unlock();
}
nsIFrame* frameForPresShell = MaybeFlushThrottledStyles(aFrameForPresShell);
if (NS_WARN_IF(!frameForPresShell)) {
return NS_OK;
}
bool isCapturingContentIgnored = false;
bool isCaptureRetargeted = false;
nsIFrame* rootFrameToHandleEvent = ComputeRootFrameToHandleEvent(
frameForPresShell, aGUIEvent, capturingContent,
&isCapturingContentIgnored, &isCaptureRetargeted);
if (isCapturingContentIgnored) {
capturingContent = nullptr;
}
// The order to generate pointer event is
// 1. check pending pointer capture.
// 2. check if there is a capturing content.
// 3. hit test
// 4. dispatch pointer events
// 5. check whether the targets of all Touch instances are in the same
// document and suppress invalid instances.
// 6. dispatch mouse or touch events.
// Try to keep frame for following check, because frame can be damaged
// during MaybeProcessPointerCapture.
{
AutoWeakFrame frameKeeper(rootFrameToHandleEvent);
PointerEventHandler::MaybeProcessPointerCapture(aGUIEvent);
// Prevent application crashes, in case damaged frame.
if (!frameKeeper.IsAlive()) {
NS_WARNING("Nothing to handle this event!");
return NS_OK;
}
}
// Only capture mouse events and pointer events.
RefPtr<Element> pointerCapturingElement =
PointerEventHandler::GetPointerCapturingElement(aGUIEvent);
if (pointerCapturingElement) {
rootFrameToHandleEvent = pointerCapturingElement->GetPrimaryFrame();
if (!rootFrameToHandleEvent) {
return HandleEventWithPointerCapturingContentWithoutItsFrame(
aFrameForPresShell, aGUIEvent, pointerCapturingElement, aEventStatus);
}
}
WidgetMouseEvent* mouseEvent = aGUIEvent->AsMouseEvent();
bool isWindowLevelMouseExit =
(aGUIEvent->mMessage == eMouseExitFromWidget) &&
(mouseEvent &&
(mouseEvent->mExitFrom.value() == WidgetMouseEvent::ePlatformTopLevel ||
mouseEvent->mExitFrom.value() == WidgetMouseEvent::ePuppet));
// Get the frame at the event point. However, don't do this if we're
// capturing and retargeting the event because the captured frame will
// be used instead below. Also keep using the root frame if we're dealing
// with a window-level mouse exit event since we want to start sending
// mouse out events at the root EventStateManager.
EventTargetData eventTargetData(rootFrameToHandleEvent);
if (!isCaptureRetargeted && !isWindowLevelMouseExit &&
!pointerCapturingElement) {
if (!ComputeEventTargetFrameAndPresShellAtEventPoint(
rootFrameToHandleEvent, aGUIEvent, &eventTargetData)) {
*aEventStatus = nsEventStatus_eIgnore;
return NS_OK;
}
}
// if a node is capturing the mouse, check if the event needs to be
// retargeted at the capturing content instead. This will be the case when
// capture retargeting is being used, no frame was found or the frame's
// content is not a descendant of the capturing content.
if (capturingContent && !pointerCapturingElement &&
(PresShell::sCapturingContentInfo.mRetargetToElement ||
!eventTargetData.GetFrameContent() ||
!nsContentUtils::ContentIsCrossDocDescendantOf(
eventTargetData.GetFrameContent(), capturingContent))) {
// A check was already done above to ensure that capturingContent is
// in this presshell.
NS_ASSERTION(capturingContent->OwnerDoc() == GetDocument(),
"Unexpected document");
nsIFrame* capturingFrame = capturingContent->GetPrimaryFrame();
if (capturingFrame) {
eventTargetData.SetFrameAndComputePresShell(capturingFrame);
}
}
if (NS_WARN_IF(!eventTargetData.GetFrame())) {
return NS_OK;
}
// Suppress mouse event if it's being targeted at an element inside
// a document which needs events suppressed
if (MaybeDiscardOrDelayMouseEvent(eventTargetData.GetFrame(), aGUIEvent)) {
return NS_OK;
}
// Check if we have an active EventStateManager which isn't the
// EventStateManager of the current PresContext. If that is the case, and
// mouse is over some ancestor document, forward event handling to the
// active document. This way content can get mouse events even when mouse
// is over the chrome or outside the window.
if (eventTargetData.MaybeRetargetToActiveDocument(aGUIEvent) &&
NS_WARN_IF(!eventTargetData.GetFrame())) {
return NS_OK;
}
// Wheel events only apply to elements. If this is a wheel event, attempt to
// update the event target from the current wheel transaction before we
// compute the element from the target frame.
eventTargetData.UpdateWheelEventTarget(aGUIEvent);
if (!eventTargetData.ComputeElementFromFrame(aGUIEvent)) {
return NS_OK;
}
// Note that even if ComputeElementFromFrame() returns true,
// eventTargetData.mContent can be nullptr here.
// Dispatch a pointer event if Pointer Events is enabled. Note that if
// pointer event listeners change the layout, eventTargetData is
// automatically updated.
if (!DispatchPrecedingPointerEvent(
aFrameForPresShell, aGUIEvent, pointerCapturingElement,
aDontRetargetEvents, &eventTargetData, aEventStatus)) {
return NS_OK;
}
// Handle the event in the correct shell.
// We pass the subshell's root frame as the frame to start from. This is
// the only correct alternative; if the event was captured then it
// must have been captured by us or some ancestor shell and we
// now ask the subshell to dispatch it normally.
EventHandler eventHandler(*eventTargetData.mPresShell);
AutoCurrentEventInfoSetter eventInfoSetter(eventHandler, eventTargetData);
// eventTargetData is on the stack and is guaranteed to keep its
// mOverrideClickTarget alive, so we can just use MOZ_KnownLive here.
nsresult rv = eventHandler.HandleEventWithCurrentEventInfo(
aGUIEvent, aEventStatus, true,
MOZ_KnownLive(eventTargetData.mOverrideClickTarget));
if (NS_FAILED(rv) ||
MOZ_UNLIKELY(eventTargetData.mPresShell->IsDestroying())) {
return rv;
}
if (aGUIEvent->mMessage == eTouchEnd) {
MaybeSynthesizeCompatMouseEventsForTouchEnd(aGUIEvent->AsTouchEvent(),
aEventStatus);
}
return NS_OK;
}
bool PresShell::EventHandler::MaybeFlushPendingNotifications(
WidgetGUIEvent* aGUIEvent) {
MOZ_ASSERT(aGUIEvent);
switch (aGUIEvent->mMessage) {
case eMouseDown:
case eMouseUp: {
RefPtr<nsPresContext> presContext = mPresShell->GetPresContext();
if (NS_WARN_IF(!presContext)) {
return false;
}
uint64_t framesConstructedCount = presContext->FramesConstructedCount();
uint64_t framesReflowedCount = presContext->FramesReflowedCount();
MOZ_KnownLive(mPresShell)->FlushPendingNotifications(FlushType::Layout);
return framesConstructedCount != presContext->FramesConstructedCount() ||
framesReflowedCount != presContext->FramesReflowedCount();
}
default:
return false;
}
}
// The type of coordinates to use for hit-testing input events
// that are relative to the RCD's viewport frame.
// On most platforms, use visual coordinates so that scrollbars
// can be targeted.
// On mobile, use layout coordinates because hit-testing in
// visual coordinates clashes with mobile viewport sizing, where
// the ViewportFrame is sized to the initial containing block
// (ICB) size, which is in layout coordinates. This is fine
// because we don't need to be able to target scrollbars on mobile
// (scrollbar dragging isn't supported).
static ViewportType ViewportTypeForInputEventsRelativeToRoot() {
#ifdef MOZ_WIDGET_ANDROID
return ViewportType::Layout;
#else
return ViewportType::Visual;
#endif
}
nsIFrame* PresShell::EventHandler::GetFrameToHandleNonTouchEvent(
nsIFrame* aRootFrameToHandleEvent, WidgetGUIEvent* aGUIEvent) {
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aGUIEvent->mClass != eTouchEventClass);
ViewportType viewportType = ViewportType::Layout;
if (aRootFrameToHandleEvent->Type() == LayoutFrameType::Viewport) {
nsPresContext* pc = aRootFrameToHandleEvent->PresContext();
if (pc->IsChrome()) {
viewportType = ViewportType::Visual;
} else if (pc->IsRootContentDocumentCrossProcess()) {
viewportType = ViewportTypeForInputEventsRelativeToRoot();
}
}
RelativeTo relativeTo{aRootFrameToHandleEvent, viewportType};
nsPoint eventPoint =
nsLayoutUtils::GetEventCoordinatesRelativeTo(aGUIEvent, relativeTo);
uint32_t flags = 0;
if (aGUIEvent->mClass == eMouseEventClass) {
WidgetMouseEvent* mouseEvent = aGUIEvent->AsMouseEvent();
if (mouseEvent && mouseEvent->mIgnoreRootScrollFrame) {
flags |= INPUT_IGNORE_ROOT_SCROLL_FRAME;
}
}
nsIFrame* targetFrame =
FindFrameTargetedByInputEvent(aGUIEvent, relativeTo, eventPoint, flags);
if (!targetFrame) {
return aRootFrameToHandleEvent;
}
if (targetFrame->PresShell() == mPresShell) {
// If found target is in mPresShell, we've already found it in the latest
// layout so that we can use it.
return targetFrame;
}
// If target is in a child document, we've not flushed its layout yet.
PresShell* childPresShell = targetFrame->PresShell();
EventHandler childEventHandler(*childPresShell);
AutoWeakFrame weakFrame(aRootFrameToHandleEvent);
bool layoutChanged =
childEventHandler.MaybeFlushPendingNotifications(aGUIEvent);
if (!weakFrame.IsAlive()) {
// Stop handling the event if the root frame to handle event is destroyed
// by the reflow. (but why?)
return nullptr;
}
if (!layoutChanged) {
// If the layout in the child PresShell hasn't been changed, we don't
// need to recompute the target.
return targetFrame;
}
// Finally, we need to recompute the target with the latest layout.
targetFrame =
FindFrameTargetedByInputEvent(aGUIEvent, relativeTo, eventPoint, flags);
return targetFrame ? targetFrame : aRootFrameToHandleEvent;
}
bool PresShell::EventHandler::ComputeEventTargetFrameAndPresShellAtEventPoint(
nsIFrame* aRootFrameToHandleEvent, WidgetGUIEvent* aGUIEvent,
EventTargetData* aEventTargetData) {
MOZ_ASSERT(aRootFrameToHandleEvent);
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aEventTargetData);
if (aGUIEvent->mClass == eTouchEventClass) {
nsIFrame* targetFrameAtTouchEvent = TouchManager::SetupTarget(
aGUIEvent->AsTouchEvent(), aRootFrameToHandleEvent);
aEventTargetData->SetFrameAndComputePresShell(targetFrameAtTouchEvent);
return true;
}
nsIFrame* targetFrame =
GetFrameToHandleNonTouchEvent(aRootFrameToHandleEvent, aGUIEvent);
aEventTargetData->SetFrameAndComputePresShell(targetFrame);
return !!aEventTargetData->GetFrame();
}
bool PresShell::EventHandler::DispatchPrecedingPointerEvent(
nsIFrame* aFrameForPresShell, WidgetGUIEvent* aGUIEvent,
nsIContent* aPointerCapturingContent, bool aDontRetargetEvents,
EventTargetData* aEventTargetData, nsEventStatus* aEventStatus) {
MOZ_ASSERT(aFrameForPresShell);
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aEventTargetData);
MOZ_ASSERT(aEventStatus);
// Dispatch pointer events from the mouse or touch events. Regarding
// pointer events from mouse, we should dispatch those pointer events to
// the same target as the source mouse events. We pass the frame found
// in hit test to PointerEventHandler and dispatch pointer events to it.
//
// Regarding pointer events from touch, the behavior is different. Touch
// events are dispatched to the same target as the target of touchstart.
// Multiple touch points must be dispatched to the same document. Pointer
// events from touch can be dispatched to different documents. We Pass the
// original frame to PointerEventHandler, reentry PresShell::HandleEvent,
// and do hit test for each point.
nsIFrame* targetFrame = aGUIEvent->mClass == eTouchEventClass
? aFrameForPresShell
: aEventTargetData->GetFrame();
if (aPointerCapturingContent) {
aEventTargetData->mOverrideClickTarget =
GetOverrideClickTarget(aGUIEvent, aFrameForPresShell);
aEventTargetData->mPresShell =
PresShell::GetShellForEventTarget(nullptr, aPointerCapturingContent);
if (!aEventTargetData->mPresShell) {
// If we can't process event for the capturing content, release
// the capture.
PointerEventHandler::ReleaseIfCaptureByDescendant(
aPointerCapturingContent);
return false;
}
targetFrame = aPointerCapturingContent->GetPrimaryFrame();
aEventTargetData->SetFrameAndContent(targetFrame, aPointerCapturingContent);
}
AutoWeakFrame weakTargetFrame(targetFrame);
AutoWeakFrame weakFrame(aEventTargetData->GetFrame());
nsCOMPtr<nsIContent> pointerEventTargetContent(
aEventTargetData->GetContent());
RefPtr<PresShell> presShell(aEventTargetData->mPresShell);
nsCOMPtr<nsIContent> mouseOrTouchEventTargetContent;
PointerEventHandler::DispatchPointerFromMouseOrTouch(
presShell, aEventTargetData->GetFrame(), pointerEventTargetContent,
aGUIEvent, aDontRetargetEvents, aEventStatus,
getter_AddRefs(mouseOrTouchEventTargetContent));
// If the target frame is alive, the caller should keep handling the event
// unless event target frame is destroyed.
if (weakTargetFrame.IsAlive() && weakFrame.IsAlive()) {
aEventTargetData->UpdateTouchEventTarget(aGUIEvent);
return true;
}
presShell->FlushPendingNotifications(FlushType::Layout);
if (MOZ_UNLIKELY(mPresShell->IsDestroying())) {
return false;
}
// The spec defines that mouse events must be dispatched to the same target as
// the pointer event.
// The Touch Events spec defines that touch events must be dispatched to the
// same target as touch start and the other browsers dispatch touch events
// even if the touch event target is not connected to the document.
// Retargetting the event is handled by AutoPointerEventTargetUpdater and
// mouseOrTouchEventTargetContent stores the result.
// If the target is no longer participating in its ownerDocument's tree,
// fire the event at the original target's nearest ancestor node.
if (!mouseOrTouchEventTargetContent) {
MOZ_ASSERT(aGUIEvent->mClass == eMouseEventClass);
return false;
}
aEventTargetData->SetFrameAndContent(
mouseOrTouchEventTargetContent->GetPrimaryFrame(),
mouseOrTouchEventTargetContent);
aEventTargetData->mPresShell =
mouseOrTouchEventTargetContent->IsInComposedDoc()
? PresShell::GetShellForEventTarget(aEventTargetData->GetFrame(),
aEventTargetData->GetContent())
: mouseOrTouchEventTargetContent->OwnerDoc()->GetPresShell();
// If new target PresShel is not found, we cannot keep handling the event.
if (!aEventTargetData->mPresShell) {
return false;
}
aEventTargetData->UpdateTouchEventTarget(aGUIEvent);
return true;
}
/**
* Event retargetting may retarget a mouse event and change the reference point.
* If event retargetting changes the reference point of a event that accessible
* caret will not handle, restore the original reference point.
*/
class AutoEventTargetPointResetter {
public:
explicit AutoEventTargetPointResetter(WidgetGUIEvent* aGUIEvent)
: mGUIEvent(aGUIEvent),
mRefPoint(aGUIEvent->mRefPoint),
mHandledByAccessibleCaret(false) {}
void SetHandledByAccessibleCaret() { mHandledByAccessibleCaret = true; }
~AutoEventTargetPointResetter() {
if (!mHandledByAccessibleCaret) {
mGUIEvent->mRefPoint = mRefPoint;
}
}
private:
WidgetGUIEvent* mGUIEvent;
LayoutDeviceIntPoint mRefPoint;
bool mHandledByAccessibleCaret;
};
bool PresShell::EventHandler::MaybeHandleEventWithAccessibleCaret(
nsIFrame* aFrameForPresShell, WidgetGUIEvent* aGUIEvent,
nsEventStatus* aEventStatus) {
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aEventStatus);
// Don't dispatch event to AccessibleCaretEventHub when the event status
// is nsEventStatus_eConsumeNoDefault. This might be happened when content
// preventDefault on the pointer events. In such case, we also call
// preventDefault on mouse events to stop default behaviors.
if (*aEventStatus == nsEventStatus_eConsumeNoDefault) {
return false;
}
if (!AccessibleCaretEnabled(GetDocument()->GetDocShell())) {
return false;
}
// AccessibleCaretEventHub handles only mouse, touch, and keyboard events.
if (aGUIEvent->mClass != eMouseEventClass &&
aGUIEvent->mClass != eTouchEventClass &&
aGUIEvent->mClass != eKeyboardEventClass) {
return false;
}
AutoEventTargetPointResetter autoEventTargetPointResetter(aGUIEvent);
// First, try the event hub at the event point to handle a long press to
// select a word in an unfocused window.
do {
EventTargetData eventTargetData(nullptr);
if (!ComputeEventTargetFrameAndPresShellAtEventPoint(
aFrameForPresShell, aGUIEvent, &eventTargetData)) {
break;
}
if (!eventTargetData.mPresShell) {
break;
}
RefPtr<AccessibleCaretEventHub> eventHub =
eventTargetData.mPresShell->GetAccessibleCaretEventHub();
if (!eventHub) {
break;
}
*aEventStatus = eventHub->HandleEvent(aGUIEvent);
if (*aEventStatus != nsEventStatus_eConsumeNoDefault) {
break;
}
// If the event is consumed, cancel APZC panning by setting
// mMultipleActionsPrevented.
aGUIEvent->mFlags.mMultipleActionsPrevented = true;
autoEventTargetPointResetter.SetHandledByAccessibleCaret();
return true;
} while (false);
// Then, we target the event to the event hub at the focused window.
nsCOMPtr<nsPIDOMWindowOuter> window = GetFocusedDOMWindowInOurWindow();
if (!window) {
return false;
}
RefPtr<Document> retargetEventDoc = window->GetExtantDoc();
if (!retargetEventDoc) {
return false;
}
RefPtr<PresShell> presShell = retargetEventDoc->GetPresShell();
if (!presShell) {
return false;
}
RefPtr<AccessibleCaretEventHub> eventHub =
presShell->GetAccessibleCaretEventHub();
if (!eventHub) {
return false;
}
*aEventStatus = eventHub->HandleEvent(aGUIEvent);
if (*aEventStatus != nsEventStatus_eConsumeNoDefault) {
return false;
}
// If the event is consumed, cancel APZC panning by setting
// mMultipleActionsPrevented.
aGUIEvent->mFlags.mMultipleActionsPrevented = true;
autoEventTargetPointResetter.SetHandledByAccessibleCaret();
return true;
}
void PresShell::EventHandler::MaybeSynthesizeCompatMouseEventsForTouchEnd(
const WidgetTouchEvent* aTouchEndEvent,
const nsEventStatus* aStatus) const {
MOZ_ASSERT(aTouchEndEvent->mMessage == eTouchEnd);
// If the eTouchEnd event is dispatched via APZ, APZCCallbackHelper dispatches
// a set of mouse events with better handling. Therefore, we don't need to
// handle that here.
if (!aTouchEndEvent->mFlags.mIsSynthesizedForTests ||
StaticPrefs::test_events_async_enabled()) {
return;
}
// If the tap was consumed or 2 or more touches occurred, we don't need the
// compatibility mouse events.
if (*aStatus == nsEventStatus_eConsumeNoDefault ||
!TouchManager::IsSingleTapEndToDoDefault(aTouchEndEvent)) {
return;
}
if (NS_WARN_IF(!aTouchEndEvent->mWidget)) {
return;
}
nsCOMPtr<nsIWidget> widget = aTouchEndEvent->mWidget;
// NOTE: I think that we don't need to implement a double click here becase
// WebDriver does not support a way to synthesize a double click and Chrome
// does not fire "dblclick" even if doing `pointerDown().pointerUp()` twice.
// FIXME: Currently we don't support long tap.
RefPtr<PresShell> presShell = mPresShell;
for (const EventMessage message : {eMouseMove, eMouseDown, eMouseUp}) {
if (MOZ_UNLIKELY(presShell->IsDestroying())) {
break;
}
nsIFrame* frameForPresShell = GetNearestFrameContainingPresShell(presShell);
if (!frameForPresShell) {
break;
}
WidgetMouseEvent event(true, message, widget, WidgetMouseEvent::eReal,
WidgetMouseEvent::eNormal);
event.mRefPoint = aTouchEndEvent->mTouches[0]->mRefPoint;
event.mButton = MouseButton::ePrimary;
event.mButtons = message == eMouseDown ? MouseButtonsFlag::ePrimaryFlag
: MouseButtonsFlag::eNoButtons;
event.mInputSource = MouseEvent_Binding::MOZ_SOURCE_TOUCH;
event.mClickCount = message == eMouseMove ? 0 : 1;
event.mModifiers = aTouchEndEvent->mModifiers;
event.convertToPointer = false;
nsEventStatus mouseEventStatus = nsEventStatus_eIgnore;
presShell->HandleEvent(frameForPresShell, &event, false, &mouseEventStatus);
}
}
bool PresShell::EventHandler::MaybeDiscardEvent(WidgetGUIEvent* aGUIEvent) {
MOZ_ASSERT(aGUIEvent);
// If it is safe to dispatch events now, don't discard the event.
if (nsContentUtils::IsSafeToRunScript()) {
return false;
}
// If the event does not cause dispatching DOM event (i.e., internal event),
// we can keep handling it even when it's not safe to run script.
if (!aGUIEvent->IsAllowedToDispatchDOMEvent()) {
return false;
}
// If the event is a composition event, we need to let IMEStateManager know
// it's discarded because it needs to listen all composition events to manage
// TextComposition instance.
if (aGUIEvent->mClass == eCompositionEventClass) {
IMEStateManager::OnCompositionEventDiscarded(
aGUIEvent->AsCompositionEvent());
}
#ifdef DEBUG
if (aGUIEvent->IsIMERelatedEvent()) {
nsPrintfCString warning("%s event is discarded",
ToChar(aGUIEvent->mMessage));
NS_WARNING(warning.get());
}
#endif // #ifdef DEBUG
nsContentUtils::WarnScriptWasIgnored(GetDocument());
return true;
}
// static
nsIContent* PresShell::EventHandler::GetCapturingContentFor(
WidgetGUIEvent* aGUIEvent) {
return (aGUIEvent->mClass == ePointerEventClass ||
aGUIEvent->mClass == eWheelEventClass ||
aGUIEvent->HasMouseEventMessage())
? PresShell::GetCapturingContent()
: nullptr;
}
bool PresShell::EventHandler::GetRetargetEventDocument(
WidgetGUIEvent* aGUIEvent, Document** aRetargetEventDocument) {
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aRetargetEventDocument);
*aRetargetEventDocument = nullptr;
// key and IME related events should not cross top level window boundary.
// Basically, such input events should be fired only on focused widget.
// However, some IMEs might need to clean up composition after focused
// window is deactivated. And also some tests on MozMill want to test key
// handling on deactivated window because MozMill window can be activated
// during tests. So, there is no merit the events should be redirected to
// active window. So, the events should be handled on the last focused
// content in the last focused DOM window in same top level window.
// Note, if no DOM window has been focused yet, we can discard the events.
if (aGUIEvent->IsTargetedAtFocusedWindow()) {
nsCOMPtr<nsPIDOMWindowOuter> window = GetFocusedDOMWindowInOurWindow();
// No DOM window in same top level window has not been focused yet,
// discard the events.
if (!window) {
return false;
}
RefPtr<Document> retargetEventDoc = window->GetExtantDoc();
if (!retargetEventDoc) {
return false;
}
retargetEventDoc.forget(aRetargetEventDocument);
return true;
}
nsIContent* capturingContent =
EventHandler::GetCapturingContentFor(aGUIEvent);
if (capturingContent) {
// if the mouse is being captured then retarget the mouse event at the
// document that is being captured.
RefPtr<Document> retargetEventDoc = capturingContent->GetComposedDoc();
retargetEventDoc.forget(aRetargetEventDocument);
return true;
}
#ifdef ANDROID
if (aGUIEvent->mClass == eTouchEventClass ||
aGUIEvent->mClass == eMouseEventClass ||
aGUIEvent->mClass == eWheelEventClass) {
RefPtr<Document> retargetEventDoc = mPresShell->GetPrimaryContentDocument();
retargetEventDoc.forget(aRetargetEventDocument);
return true;
}
#endif // #ifdef ANDROID
// When we don't find another document to handle the event, we need to keep
// handling the event by ourselves.
return true;
}
nsIFrame* PresShell::EventHandler::GetFrameForHandlingEventWith(
WidgetGUIEvent* aGUIEvent, Document* aRetargetDocument,
nsIFrame* aFrameForPresShell) {
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aRetargetDocument);
RefPtr<PresShell> retargetPresShell = aRetargetDocument->GetPresShell();
// Even if the document doesn't have PresShell, i.e., it's invisible, we
// need to dispatch only KeyboardEvent in its nearest visible document
// because key focus shouldn't be caught by invisible document.
if (!retargetPresShell) {
if (!aGUIEvent->HasKeyEventMessage()) {
return nullptr;
}
Document* retargetEventDoc = aRetargetDocument;
while (!retargetPresShell) {
retargetEventDoc = retargetEventDoc->GetInProcessParentDocument();
if (!retargetEventDoc) {
return nullptr;
}
retargetPresShell = retargetEventDoc->GetPresShell();
}
}
// If the found PresShell is this instance, caller needs to keep handling
// aGUIEvent by itself. Therefore, return the given frame which was set
// to aFrame of HandleEvent().
if (retargetPresShell == mPresShell) {
return aFrameForPresShell;
}
// Use root frame of the new PresShell if there is.
nsIFrame* rootFrame = retargetPresShell->GetRootFrame();
if (rootFrame) {
return rootFrame;
}
// Otherwise, and if aGUIEvent requires content of PresShell, caller should
// stop handling the event.
if (aGUIEvent->mMessage == eQueryTextContent ||
aGUIEvent->IsContentCommandEvent()) {
return nullptr;
}
// Otherwise, use nearest ancestor frame which includes the PresShell.
return GetNearestFrameContainingPresShell(retargetPresShell);
}
bool PresShell::EventHandler::MaybeHandleEventWithAnotherPresShell(
nsIFrame* aFrameForPresShell, WidgetGUIEvent* aGUIEvent,
nsEventStatus* aEventStatus, nsresult* aRv) {
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aEventStatus);
MOZ_ASSERT(aRv);
*aRv = NS_OK;
RefPtr<Document> retargetEventDoc;
if (!GetRetargetEventDocument(aGUIEvent, getter_AddRefs(retargetEventDoc))) {
// Nobody can handle this event. So, treat as handled by somebody to make
// caller do nothing anymore.
return true;
}
// If there is no proper retarget document, the caller should handle the
// event by itself.
if (!retargetEventDoc) {
return false;
}
nsIFrame* frame = GetFrameForHandlingEventWith(aGUIEvent, retargetEventDoc,
aFrameForPresShell);
if (!frame) {
// Nobody can handle this event. So, treat as handled by somebody to make
// caller do nothing anymore.
return true;
}
// If we reached same frame as set to HandleEvent(), the caller should handle
// the event by itself.
if (frame == aFrameForPresShell) {
return false;
}
// We need to handle aGUIEvent with another PresShell.
RefPtr<PresShell> presShell = frame->PresContext()->PresShell();
*aRv = presShell->HandleEvent(frame, aGUIEvent, true, aEventStatus);
return true;
}
bool PresShell::EventHandler::MaybeDiscardOrDelayKeyboardEvent(
WidgetGUIEvent* aGUIEvent) {
MOZ_ASSERT(aGUIEvent);
if (aGUIEvent->mClass != eKeyboardEventClass) {
return false;
}
Document* document = GetDocument();
if (!document || !document->EventHandlingSuppressed()) {
return false;
}
MOZ_ASSERT_IF(InputTaskManager::CanSuspendInputEvent(),
!InputTaskManager::Get()->IsSuspended());
if (aGUIEvent->mMessage == eKeyDown) {
mPresShell->mNoDelayedKeyEvents = true;
} else if (!mPresShell->mNoDelayedKeyEvents) {
UniquePtr<DelayedKeyEvent> delayedKeyEvent =
MakeUnique<DelayedKeyEvent>(aGUIEvent->AsKeyboardEvent());
mPresShell->mDelayedEvents.AppendElement(std::move(delayedKeyEvent));
}
aGUIEvent->mFlags.mIsSuppressedOrDelayed = true;
return true;
}
bool PresShell::EventHandler::MaybeDiscardOrDelayMouseEvent(
nsIFrame* aFrameToHandleEvent, WidgetGUIEvent* aGUIEvent) {
MOZ_ASSERT(aFrameToHandleEvent);
MOZ_ASSERT(aGUIEvent);
if (aGUIEvent->mClass != eMouseEventClass) {
return false;
}
if (!aFrameToHandleEvent->PresContext()
->Document()
->EventHandlingSuppressed()) {
return false;
}
MOZ_ASSERT_IF(InputTaskManager::CanSuspendInputEvent() &&
aGUIEvent->mMessage != eMouseMove,
!InputTaskManager::Get()->IsSuspended());
RefPtr<PresShell> ps = aFrameToHandleEvent->PresShell();
if (aGUIEvent->mMessage == eMouseDown) {
ps->mNoDelayedMouseEvents = true;
} else if (!ps->mNoDelayedMouseEvents &&
(aGUIEvent->mMessage == eMouseUp ||
// contextmenu is triggered after right mouseup on Windows and
// right mousedown on other platforms.
aGUIEvent->mMessage == eContextMenu ||
aGUIEvent->mMessage == eMouseExitFromWidget)) {
UniquePtr<DelayedMouseEvent> delayedMouseEvent =
MakeUnique<DelayedMouseEvent>(aGUIEvent->AsMouseEvent());
ps->mDelayedEvents.AppendElement(std::move(delayedMouseEvent));
}
// If there is a suppressed event listener associated with the document,
// notify it about the suppressed mouse event. This allows devtools
// features to continue receiving mouse events even when the devtools
// debugger has paused execution in a page.
RefPtr<EventListener> suppressedListener = aFrameToHandleEvent->PresContext()
->Document()
->GetSuppressedEventListener();
if (!suppressedListener ||
aGUIEvent->AsMouseEvent()->mReason == WidgetMouseEvent::eSynthesized) {
return true;
}
nsCOMPtr<nsIContent> targetContent;
aFrameToHandleEvent->GetContentForEvent(aGUIEvent,
getter_AddRefs(targetContent));
if (targetContent) {
aGUIEvent->mTarget = targetContent;
}
nsCOMPtr<EventTarget> eventTarget = aGUIEvent->mTarget;
RefPtr<Event> event = EventDispatcher::CreateEvent(
eventTarget, aFrameToHandleEvent->PresContext(), aGUIEvent, u""_ns);
suppressedListener->HandleEvent(*event);
return true;
}
nsIFrame* PresShell::EventHandler::MaybeFlushThrottledStyles(
nsIFrame* aFrameForPresShell) {
if (!GetDocument()) {
// XXX Only when mPresShell has document, we'll try to look for a frame
// containing mPresShell even if given frame is nullptr. Does this
// make sense?
return aFrameForPresShell;
}
PresShell* rootPresShell = mPresShell->GetRootPresShell();
if (NS_WARN_IF(!rootPresShell)) {
return nullptr;
}
Document* rootDocument = rootPresShell->GetDocument();
if (NS_WARN_IF(!rootDocument)) {
return nullptr;
}
AutoWeakFrame weakFrameForPresShell(aFrameForPresShell);
{ // scope for scriptBlocker.
nsAutoScriptBlocker scriptBlocker;
FlushThrottledStyles(*rootDocument);
}
if (weakFrameForPresShell.IsAlive()) {
return aFrameForPresShell;
}
return GetNearestFrameContainingPresShell(mPresShell);
}
nsIFrame* PresShell::EventHandler::ComputeRootFrameToHandleEvent(
nsIFrame* aFrameForPresShell, WidgetGUIEvent* aGUIEvent,
nsIContent* aCapturingContent, bool* aIsCapturingContentIgnored,
bool* aIsCaptureRetargeted) {
MOZ_ASSERT(aFrameForPresShell);
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aIsCapturingContentIgnored);
MOZ_ASSERT(aIsCaptureRetargeted);
nsIFrame* rootFrameToHandleEvent = ComputeRootFrameToHandleEventWithPopup(
aFrameForPresShell, aGUIEvent, aCapturingContent,
aIsCapturingContentIgnored);
if (*aIsCapturingContentIgnored) {
// If the capturing content is ignored, we don't need to respect it.
return rootFrameToHandleEvent;
}
if (!aCapturingContent) {
return rootFrameToHandleEvent;
}
// If we have capturing content, let's compute root frame with it again.
return ComputeRootFrameToHandleEventWithCapturingContent(
rootFrameToHandleEvent, aCapturingContent, aIsCapturingContentIgnored,
aIsCaptureRetargeted);
}
nsIFrame* PresShell::EventHandler::ComputeRootFrameToHandleEventWithPopup(
nsIFrame* aRootFrameToHandleEvent, WidgetGUIEvent* aGUIEvent,
nsIContent* aCapturingContent, bool* aIsCapturingContentIgnored) {
MOZ_ASSERT(aRootFrameToHandleEvent);
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aIsCapturingContentIgnored);
*aIsCapturingContentIgnored = false;
nsPresContext* framePresContext = aRootFrameToHandleEvent->PresContext();
nsPresContext* rootPresContext = framePresContext->GetRootPresContext();
NS_ASSERTION(rootPresContext == GetPresContext()->GetRootPresContext(),
"How did we end up outside the connected "
"prescontext/viewmanager hierarchy?");
nsIFrame* popupFrame = nsLayoutUtils::GetPopupFrameForEventCoordinates(
rootPresContext, aGUIEvent);
if (!popupFrame) {
return aRootFrameToHandleEvent;
}
// If a remote browser is currently capturing input break out if we
// detect a chrome generated popup.
// XXXedgar, do we need to check fission OOP iframe?
if (aCapturingContent &&
EventStateManager::IsTopLevelRemoteTarget(aCapturingContent)) {
*aIsCapturingContentIgnored = true;
}
// If the popupFrame is an ancestor of the 'frame', the frame should
// handle the event, otherwise, the popup should handle it.
if (nsContentUtils::ContentIsCrossDocDescendantOf(
framePresContext->GetPresShell()->GetDocument(),
popupFrame->GetContent())) {
return aRootFrameToHandleEvent;
}
// If we aren't starting our event dispatch from the root frame of the
// root prescontext, then someone must be capturing the mouse. In that
// case we only want to use the popup list if the capture is
// inside the popup.
if (framePresContext == rootPresContext &&
aRootFrameToHandleEvent == FrameConstructor()->GetRootFrame()) {
return popupFrame;
}
if (aCapturingContent && !*aIsCapturingContentIgnored &&
aCapturingContent->IsInclusiveDescendantOf(popupFrame->GetContent())) {
return popupFrame;
}
return aRootFrameToHandleEvent;
}
nsIFrame*
PresShell::EventHandler::ComputeRootFrameToHandleEventWithCapturingContent(
nsIFrame* aRootFrameToHandleEvent, nsIContent* aCapturingContent,
bool* aIsCapturingContentIgnored, bool* aIsCaptureRetargeted) {
MOZ_ASSERT(aRootFrameToHandleEvent);
MOZ_ASSERT(aCapturingContent);
MOZ_ASSERT(aIsCapturingContentIgnored);
MOZ_ASSERT(aIsCaptureRetargeted);
*aIsCapturingContentIgnored = false;
*aIsCaptureRetargeted = false;
// If a capture is active, determine if the BrowsingContext is active. If
// not, clear the capture and target the mouse event normally instead. This
// would occur if the mouse button is held down while a tab change occurs.
// If the BrowsingContext is active, look for a scrolling container.
BrowsingContext* bc = GetPresContext()->Document()->GetBrowsingContext();
if (!bc || !bc->IsActive()) {
ClearMouseCapture();
*aIsCapturingContentIgnored = true;
return aRootFrameToHandleEvent;
}
if (PresShell::sCapturingContentInfo.mRetargetToElement) {
*aIsCaptureRetargeted = true;
return aRootFrameToHandleEvent;
}
// A check was already done above to ensure that aCapturingContent is
// in this presshell.
NS_ASSERTION(aCapturingContent->OwnerDoc() == GetDocument(),
"Unexpected document");
nsIFrame* captureFrame = aCapturingContent->GetPrimaryFrame();
if (!captureFrame) {
return aRootFrameToHandleEvent;
}
// scrollable frames should use the scrolling container as the root instead
// of the document
nsIScrollableFrame* scrollFrame = do_QueryFrame(captureFrame);
return scrollFrame ? scrollFrame->GetScrolledFrame()
: aRootFrameToHandleEvent;
}
nsresult
PresShell::EventHandler::HandleEventWithPointerCapturingContentWithoutItsFrame(
nsIFrame* aFrameForPresShell, WidgetGUIEvent* aGUIEvent,
nsIContent* aPointerCapturingContent, nsEventStatus* aEventStatus) {
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aPointerCapturingContent);
MOZ_ASSERT(!aPointerCapturingContent->GetPrimaryFrame(),
"Handle the event with frame rather than only with the content");
MOZ_ASSERT(aEventStatus);
RefPtr<PresShell> presShellForCapturingContent =
PresShell::GetShellForEventTarget(nullptr, aPointerCapturingContent);
if (!presShellForCapturingContent) {
// If we can't process event for the capturing content, release
// the capture.
PointerEventHandler::ReleaseIfCaptureByDescendant(aPointerCapturingContent);
// Since we don't dispatch ePointeUp nor ePointerCancel in this case,
// EventStateManager::PostHandleEvent does not have a chance to dispatch
// ePointerLostCapture event. Therefore, we need to dispatch it here.
PointerEventHandler::MaybeImplicitlyReleasePointerCapture(aGUIEvent);
return NS_OK;
}
nsCOMPtr<nsIContent> overrideClickTarget =
GetOverrideClickTarget(aGUIEvent, aFrameForPresShell);
// Dispatch events to the capturing content even it's frame is
// destroyed.
PointerEventHandler::DispatchPointerFromMouseOrTouch(
presShellForCapturingContent, nullptr, aPointerCapturingContent,
aGUIEvent, false, aEventStatus, nullptr);
if (presShellForCapturingContent == mPresShell) {
return HandleEventWithTarget(aGUIEvent, nullptr, aPointerCapturingContent,
aEventStatus, true, nullptr,
overrideClickTarget);
}
EventHandler eventHandlerForCapturingContent(
std::move(presShellForCapturingContent));
return eventHandlerForCapturingContent.HandleEventWithTarget(
aGUIEvent, nullptr, aPointerCapturingContent, aEventStatus, true, nullptr,
overrideClickTarget);
}
nsresult PresShell::EventHandler::HandleEventAtFocusedContent(
WidgetGUIEvent* aGUIEvent, nsEventStatus* aEventStatus) {
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aGUIEvent->IsTargetedAtFocusedContent());
MOZ_ASSERT(aEventStatus);
AutoCurrentEventInfoSetter eventInfoSetter(*this);
RefPtr<Element> eventTargetElement =
ComputeFocusedEventTargetElement(aGUIEvent);
mPresShell->mCurrentEventFrame = nullptr;
if (eventTargetElement) {
nsresult rv = NS_OK;
if (MaybeHandleEventWithAnotherPresShell(eventTargetElement, aGUIEvent,
aEventStatus, &rv)) {
return rv;
}
}
// If we cannot handle the event with mPresShell, let's try to handle it
// with parent PresShell.
mPresShell->mCurrentEventContent = eventTargetElement;
if (!mPresShell->GetCurrentEventContent() ||
!mPresShell->GetCurrentEventFrame() ||
InZombieDocument(mPresShell->mCurrentEventContent)) {
return RetargetEventToParent(aGUIEvent, aEventStatus);
}
nsresult rv =
HandleEventWithCurrentEventInfo(aGUIEvent, aEventStatus, true, nullptr);
return rv;
}
Element* PresShell::EventHandler::ComputeFocusedEventTargetElement(
WidgetGUIEvent* aGUIEvent) {
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aGUIEvent->IsTargetedAtFocusedContent());
// key and IME related events go to the focused frame in this DOM window.
nsPIDOMWindowOuter* window = GetDocument()->GetWindow();
nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
Element* eventTargetElement = nsFocusManager::GetFocusedDescendant(
window, nsFocusManager::eOnlyCurrentWindow,
getter_AddRefs(focusedWindow));
// otherwise, if there is no focused content or the focused content has
// no frame, just use the root content. This ensures that key events
// still get sent to the window properly if nothing is focused or if a
// frame goes away while it is focused.
if (!eventTargetElement || !eventTargetElement->GetPrimaryFrame()) {
eventTargetElement = GetDocument()->GetUnfocusedKeyEventTarget();
}
switch (aGUIEvent->mMessage) {
case eKeyDown:
sLastKeyDownEventTargetElement = eventTargetElement;
return eventTargetElement;
case eKeyPress:
case eKeyUp:
if (!sLastKeyDownEventTargetElement) {
return eventTargetElement;
}
// If a different element is now focused for the keypress/keyup event
// than what was focused during the keydown event, check if the new
// focused element is not in a chrome document any more, and if so,
// retarget the event back at the keydown target. This prevents a
// content area from grabbing the focus from chrome in-between key
// events.
if (eventTargetElement) {
bool keyDownIsChrome = nsContentUtils::IsChromeDoc(
sLastKeyDownEventTargetElement->GetComposedDoc());
if (keyDownIsChrome != nsContentUtils::IsChromeDoc(
eventTargetElement->GetComposedDoc()) ||
(keyDownIsChrome && BrowserParent::GetFrom(eventTargetElement))) {
eventTargetElement = sLastKeyDownEventTargetElement;
}
}
if (aGUIEvent->mMessage == eKeyUp) {
sLastKeyDownEventTargetElement = nullptr;
}
[[fallthrough]];
default:
return eventTargetElement;
}
}
bool PresShell::EventHandler::MaybeHandleEventWithAnotherPresShell(
Element* aEventTargetElement, WidgetGUIEvent* aGUIEvent,
nsEventStatus* aEventStatus, nsresult* aRv) {
MOZ_ASSERT(aEventTargetElement);
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(!aGUIEvent->IsUsingCoordinates());
MOZ_ASSERT(aEventStatus);
MOZ_ASSERT(aRv);
Document* eventTargetDocument = aEventTargetElement->OwnerDoc();
if (!eventTargetDocument || eventTargetDocument == GetDocument()) {
*aRv = NS_OK;
return false;
}
RefPtr<PresShell> eventTargetPresShell = eventTargetDocument->GetPresShell();
if (!eventTargetPresShell) {
*aRv = NS_OK;
return true; // No PresShell can handle the event.
}
EventHandler eventHandler(std::move(eventTargetPresShell));
*aRv = eventHandler.HandleRetargetedEvent(aGUIEvent, aEventStatus,
aEventTargetElement);
return true;
}
nsresult PresShell::EventHandler::HandleEventWithFrameForPresShell(
nsIFrame* aFrameForPresShell, WidgetGUIEvent* aGUIEvent,
nsEventStatus* aEventStatus) {
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(!aGUIEvent->IsUsingCoordinates());
MOZ_ASSERT(!aGUIEvent->IsTargetedAtFocusedContent());
MOZ_ASSERT(aEventStatus);
AutoCurrentEventInfoSetter eventInfoSetter(*this, aFrameForPresShell,
nullptr);
nsresult rv = NS_OK;
if (mPresShell->GetCurrentEventFrame()) {
rv =
HandleEventWithCurrentEventInfo(aGUIEvent, aEventStatus, true, nullptr);
}
return rv;
}
Document* PresShell::GetPrimaryContentDocument() {
nsPresContext* context = GetPresContext();
if (!context || !context->IsRoot()) {
return nullptr;
}
nsCOMPtr<nsIDocShellTreeItem> shellAsTreeItem = context->GetDocShell();
if (!shellAsTreeItem) {
return nullptr;
}
nsCOMPtr<nsIDocShellTreeOwner> owner;
shellAsTreeItem->GetTreeOwner(getter_AddRefs(owner));
if (!owner) {
return nullptr;
}
// now get the primary content shell (active tab)
nsCOMPtr<nsIDocShellTreeItem> item;
owner->GetPrimaryContentShell(getter_AddRefs(item));
nsCOMPtr<nsIDocShell> childDocShell = do_QueryInterface(item);
if (!childDocShell) {
return nullptr;
}
return childDocShell->GetExtantDocument();
}
nsresult PresShell::EventHandler::HandleEventWithTarget(
WidgetEvent* aEvent, nsIFrame* aNewEventFrame, nsIContent* aNewEventContent,
nsEventStatus* aEventStatus, bool aIsHandlingNativeEvent,
nsIContent** aTargetContent, nsIContent* aOverrideClickTarget) {
MOZ_ASSERT(aEvent);
MOZ_DIAGNOSTIC_ASSERT(aEvent->IsTrusted());
#if DEBUG
MOZ_ASSERT(!aNewEventFrame ||
aNewEventFrame->PresContext()->GetPresShell() == mPresShell,
"wrong shell");
if (aNewEventContent) {
Document* doc = aNewEventContent->GetComposedDoc();
NS_ASSERTION(doc, "event for content that isn't in a document");
// NOTE: We don't require that the document still have a PresShell.
// See bug 1375940.
}
#endif
NS_ENSURE_STATE(!aNewEventContent ||
aNewEventContent->GetComposedDoc() == GetDocument());
if (aEvent->mClass == ePointerEventClass) {
mPresShell->RecordPointerLocation(aEvent->AsMouseEvent());
}
AutoPointerEventTargetUpdater updater(mPresShell, aEvent, aNewEventFrame,
aNewEventContent, aTargetContent);
AutoCurrentEventInfoSetter eventInfoSetter(*this, aNewEventFrame,
aNewEventContent);
nsresult rv = HandleEventWithCurrentEventInfo(aEvent, aEventStatus, false,
aOverrideClickTarget);
return rv;
}
namespace {
class MOZ_RAII AutoEventHandler final {
public:
AutoEventHandler(WidgetEvent* aEvent, Document* aDocument) : mEvent(aEvent) {
MOZ_ASSERT(mEvent);
MOZ_ASSERT(mEvent->IsTrusted());
if (mEvent->mMessage == eMouseDown) {
PresShell::ReleaseCapturingContent();
PresShell::AllowMouseCapture(true);
}
if (NeedsToUpdateCurrentMouseBtnState()) {
WidgetMouseEvent* mouseEvent = mEvent->AsMouseEvent();
if (mouseEvent) {
EventStateManager::sCurrentMouseBtn = mouseEvent->mButton;
}
}
}
~AutoEventHandler() {
if (mEvent->mMessage == eMouseDown) {
PresShell::AllowMouseCapture(false);
}
if (NeedsToUpdateCurrentMouseBtnState()) {
EventStateManager::sCurrentMouseBtn = MouseButton::eNotPressed;
}
}
protected:
bool NeedsToUpdateCurrentMouseBtnState() const {
return mEvent->mMessage == eMouseDown || mEvent->mMessage == eMouseUp ||
mEvent->mMessage == ePointerDown || mEvent->mMessage == ePointerUp;
}
WidgetEvent* mEvent;
};
} // anonymous namespace
nsresult PresShell::EventHandler::HandleEventWithCurrentEventInfo(
WidgetEvent* aEvent, nsEventStatus* aEventStatus,
bool aIsHandlingNativeEvent, nsIContent* aOverrideClickTarget) {
MOZ_ASSERT(aEvent);
MOZ_ASSERT(aEventStatus);
RefPtr<EventStateManager> manager = GetPresContext()->EventStateManager();
// If we cannot handle the event with mPresShell because of no target,
// just record the response time.
// XXX Is this intentional? In such case, the score is really good because
// of nothing to do. So, it may make average and median better.
if (NS_EVENT_NEEDS_FRAME(aEvent) && !mPresShell->GetCurrentEventFrame() &&
!mPresShell->GetCurrentEventContent()) {
RecordEventHandlingResponsePerformance(aEvent);
return NS_OK;
}
if (mPresShell->mCurrentEventContent && aEvent->IsTargetedAtFocusedWindow() &&
aEvent->AllowFlushingPendingNotifications()) {
if (RefPtr<nsFocusManager> fm = nsFocusManager::GetFocusManager()) {
// This may run script now. So, mPresShell might be destroyed after here.
nsCOMPtr<nsIContent> currentEventContent =
mPresShell->mCurrentEventContent;
fm->FlushBeforeEventHandlingIfNeeded(currentEventContent);
}
}
bool touchIsNew = false;
if (!PrepareToDispatchEvent(aEvent, aEventStatus, &touchIsNew)) {
return NS_OK;
}
// We finished preparing to dispatch the event. So, let's record the
// performance.
RecordEventPreparationPerformance(aEvent);
AutoHandlingUserInputStatePusher userInpStatePusher(
UserActivation::IsUserInteractionEvent(aEvent), aEvent);
AutoEventHandler eventHandler(aEvent, GetDocument());
AutoPopupStatePusher popupStatePusher(
PopupBlocker::GetEventPopupControlState(aEvent));
// FIXME. If the event was reused, we need to clear the old target,
// bug 329430
aEvent->mTarget = nullptr;
HandlingTimeAccumulator handlingTimeAccumulator(*this, aEvent);
nsresult rv = DispatchEvent(manager, aEvent, touchIsNew, aEventStatus,
aOverrideClickTarget);
if (!mPresShell->IsDestroying() && aIsHandlingNativeEvent) {
// Ensure that notifications to IME should be sent before getting next
// native event from the event queue.
// XXX Should we check the event message or event class instead of
// using aIsHandlingNativeEvent?
manager->TryToFlushPendingNotificationsToIME();
}
FinalizeHandlingEvent(aEvent, aEventStatus);
RecordEventHandlingResponsePerformance(aEvent);
return rv; // Result of DispatchEvent()
}
nsresult PresShell::EventHandler::DispatchEvent(
EventStateManager* aEventStateManager, WidgetEvent* aEvent,
bool aTouchIsNew, nsEventStatus* aEventStatus,
nsIContent* aOverrideClickTarget) {
MOZ_ASSERT(aEventStateManager);
MOZ_ASSERT(aEvent);
MOZ_ASSERT(aEventStatus);
// 1. Give event to event manager for pre event state changes and
// generation of synthetic events.
{ // Scope for presContext
RefPtr<nsPresContext> presContext = GetPresContext();
nsCOMPtr<nsIContent> eventContent = mPresShell->mCurrentEventContent;
nsresult rv = aEventStateManager->PreHandleEvent(
presContext, aEvent, mPresShell->mCurrentEventFrame, eventContent,
aEventStatus, aOverrideClickTarget);
if (NS_FAILED(rv)) {
return rv;
}
}
// 2. Give event to the DOM for third party and JS use.
bool wasHandlingKeyBoardEvent = nsContentUtils::IsHandlingKeyBoardEvent();
if (aEvent->mClass == eKeyboardEventClass) {
nsContentUtils::SetIsHandlingKeyBoardEvent(true);
}
// If EventStateManager or something wants reply from remote process and
// needs to win any other event listeners in chrome, the event is both
// stopped its propagation and marked as "waiting reply from remote
// process". In this case, PresShell shouldn't dispatch the event into
// the DOM tree because they don't have a chance to stop propagation in
// the system event group. On the other hand, if its propagation is not
// stopped, that means that the event may be reserved by chrome. If it's
// reserved by chrome, the event shouldn't be sent to any remote
// processes. In this case, PresShell needs to dispatch the event to
// the DOM tree for checking if it's reserved.
if (aEvent->IsAllowedToDispatchDOMEvent() &&
!(aEvent->PropagationStopped() &&
aEvent->IsWaitingReplyFromRemoteProcess())) {
MOZ_ASSERT(nsContentUtils::IsSafeToRunScript(),
"Somebody changed aEvent to cause a DOM event!");
nsPresShellEventCB eventCB(mPresShell);
if (nsIFrame* target = mPresShell->GetCurrentEventFrame()) {
if (target->OnlySystemGroupDispatch(aEvent->mMessage)) {
aEvent->StopPropagation();
}
}
if (aEvent->mClass == eTouchEventClass) {
DispatchTouchEventToDOM(aEvent, aEventStatus, &eventCB, aTouchIsNew);
} else {
DispatchEventToDOM(aEvent, aEventStatus, &eventCB);
}
}
nsContentUtils::SetIsHandlingKeyBoardEvent(wasHandlingKeyBoardEvent);
if (mPresShell->IsDestroying()) {
return NS_OK;
}
// 3. Give event to event manager for post event state changes and
// generation of synthetic events.
// Refetch the prescontext, in case it changed.
RefPtr<nsPresContext> presContext = GetPresContext();
return aEventStateManager->PostHandleEvent(
presContext, aEvent, mPresShell->GetCurrentEventFrame(), aEventStatus,
aOverrideClickTarget);
}
bool PresShell::EventHandler::PrepareToDispatchEvent(
WidgetEvent* aEvent, nsEventStatus* aEventStatus, bool* aTouchIsNew) {
MOZ_ASSERT(aEvent->IsTrusted());
MOZ_ASSERT(aEventStatus);
MOZ_ASSERT(aTouchIsNew);
*aTouchIsNew = false;
if (aEvent->IsUserAction()) {
mPresShell->mHasHandledUserInput = true;
}
switch (aEvent->mMessage) {
case eKeyPress:
case eKeyDown:
case eKeyUp: {
WidgetKeyboardEvent* keyboardEvent = aEvent->AsKeyboardEvent();
MaybeHandleKeyboardEventBeforeDispatch(keyboardEvent);
return true;
}
case eMouseMove: {
bool allowCapture = EventStateManager::GetActiveEventStateManager() &&
GetPresContext() &&
GetPresContext()->EventStateManager() ==
EventStateManager::GetActiveEventStateManager();
PresShell::AllowMouseCapture(allowCapture);
return true;
}
case eDrop: {
nsCOMPtr<nsIDragSession> session = nsContentUtils::GetDragSession();
if (session) {
bool onlyChromeDrop = false;
session->GetOnlyChromeDrop(&onlyChromeDrop);
if (onlyChromeDrop) {
aEvent->mFlags.mOnlyChromeDispatch = true;
}
}
return true;
}
case eDragExit: {
if (!StaticPrefs::dom_event_dragexit_enabled()) {
aEvent->mFlags.mOnlyChromeDispatch = true;
}
return true;
}
case eContextMenu: {
// If we cannot open context menu even though eContextMenu is fired, we
// should stop dispatching it into the DOM.
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (mouseEvent->IsContextMenuKeyEvent() &&
!AdjustContextMenuKeyEvent(mouseEvent)) {
return false;
}
// If "Shift" state is active, context menu should be forcibly opened even
// if web apps want to prevent it since we respect our users' intention.
// In this case, we don't fire "contextmenu" event on web content because
// of not cancelable.
if (mouseEvent->IsShift() &&
StaticPrefs::dom_event_contextmenu_shift_suppresses_event()) {
aEvent->mFlags.mOnlyChromeDispatch = true;
aEvent->mFlags.mRetargetToNonNativeAnonymous = true;
}
return true;
}
case eTouchStart:
case eTouchMove:
case eTouchEnd:
case eTouchCancel:
case eTouchPointerCancel:
return mPresShell->mTouchManager.PreHandleEvent(
aEvent, aEventStatus, *aTouchIsNew, mPresShell->mCurrentEventContent);
default:
return true;
}
}
void PresShell::EventHandler::FinalizeHandlingEvent(
WidgetEvent* aEvent, const nsEventStatus* aStatus) {
switch (aEvent->mMessage) {
case eKeyPress:
case eKeyDown:
case eKeyUp: {
if (aEvent->AsKeyboardEvent()->mKeyCode == NS_VK_ESCAPE) {
if (aEvent->mMessage == eKeyUp) {
// Reset this flag after key up is handled.
mPresShell->mIsLastChromeOnlyEscapeKeyConsumed = false;
} else {
if (aEvent->mFlags.mOnlyChromeDispatch &&
aEvent->mFlags.mDefaultPreventedByChrome) {
mPresShell->mIsLastChromeOnlyEscapeKeyConsumed = true;
}
if (aEvent->mMessage == eKeyDown &&
!aEvent->mFlags.mDefaultPrevented) {
if (RefPtr<Document> doc = GetDocument()) {
doc->HandleEscKey();
}
}
}
}
if (aEvent->mMessage == eKeyDown) {
mPresShell->mIsLastKeyDownCanceled = aEvent->mFlags.mDefaultPrevented;
}
return;
}
case eMouseUp:
// reset the capturing content now that the mouse button is up
PresShell::ReleaseCapturingContent();
return;
case eMouseMove:
PresShell::AllowMouseCapture(false);
return;
case eDrag:
case eDragEnd:
case eDragEnter:
case eDragExit:
case eDragLeave:
case eDragOver:
case eDrop: {
// After any drag event other than dragstart (which is handled
// separately, as we need to collect the data first), the DataTransfer
// needs to be made protected, and then disconnected.
DataTransfer* dataTransfer = aEvent->AsDragEvent()->mDataTransfer;
if (dataTransfer) {
dataTransfer->Disconnect();
}
return;
}
case eTouchStart:
case eTouchMove:
case eTouchEnd:
case eTouchCancel:
case eTouchPointerCancel:
case eMouseLongTap:
case eContextMenu: {
mPresShell->mTouchManager.PostHandleEvent(aEvent, aStatus);
break;
}
default:
return;
}
}
void PresShell::EventHandler::MaybeHandleKeyboardEventBeforeDispatch(
WidgetKeyboardEvent* aKeyboardEvent) {
MOZ_ASSERT(aKeyboardEvent);
if (aKeyboardEvent->mKeyCode != NS_VK_ESCAPE) {
return;
}
// If we're in fullscreen mode, exit from it forcibly when Escape key is
// pressed.
Document* doc = mPresShell->GetCurrentEventContent()
? mPresShell->mCurrentEventContent->OwnerDoc()
: nullptr;
Document* root = nsContentUtils::GetInProcessSubtreeRootDocument(doc);
if (root && root->GetFullscreenElement()) {
// Prevent default action on ESC key press when exiting
// DOM fullscreen mode. This prevents the browser ESC key
// handler from stopping all loads in the document, which
// would cause <video> loads to stop.
// XXX We need to claim the Escape key event which will be
// dispatched only into chrome is already consumed by
// content because we need to prevent its default here
// for some reasons (not sure) but we need to detect
// if a chrome event handler will call PreventDefault()
// again and check it later.
aKeyboardEvent->PreventDefaultBeforeDispatch(CrossProcessForwarding::eStop);
aKeyboardEvent->mFlags.mOnlyChromeDispatch = true;
// The event listeners in chrome can prevent this ESC behavior by
// calling prevent default on the preceding keydown/press events.
if (!mPresShell->mIsLastChromeOnlyEscapeKeyConsumed &&
aKeyboardEvent->mMessage == eKeyUp) {
// ESC key released while in DOM fullscreen mode.
// Fully exit all browser windows and documents from
// fullscreen mode.
Document::AsyncExitFullscreen(nullptr);
}
}
nsCOMPtr<Document> pointerLockedDoc = PointerLockManager::GetLockedDocument();
if (!mPresShell->mIsLastChromeOnlyEscapeKeyConsumed && pointerLockedDoc) {
// XXX See above comment to understand the reason why this needs
// to claim that the Escape key event is consumed by content
// even though it will be dispatched only into chrome.
aKeyboardEvent->PreventDefaultBeforeDispatch(CrossProcessForwarding::eStop);
aKeyboardEvent->mFlags.mOnlyChromeDispatch = true;
if (aKeyboardEvent->mMessage == eKeyUp) {
PointerLockManager::Unlock();
}
}
}
void PresShell::EventHandler::RecordEventPreparationPerformance(
const WidgetEvent* aEvent) {
MOZ_ASSERT(aEvent);
switch (aEvent->mMessage) {
case eKeyPress:
case eKeyDown:
case eKeyUp:
if (aEvent->AsKeyboardEvent()->ShouldInteractionTimeRecorded()) {
GetPresContext()->RecordInteractionTime(
nsPresContext::InteractionType::KeyInteraction, aEvent->mTimeStamp);
}
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_QUEUED_KEYBOARD_MS,
aEvent->mTimeStamp);
return;
case eMouseDown:
case eMouseUp:
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_QUEUED_CLICK_MS,
aEvent->mTimeStamp);
[[fallthrough]];
case ePointerDown:
case ePointerUp:
GetPresContext()->RecordInteractionTime(
nsPresContext::InteractionType::ClickInteraction, aEvent->mTimeStamp);
return;
case eMouseMove:
if (aEvent->mFlags.mHandledByAPZ) {
Telemetry::AccumulateTimeDelta(
Telemetry::INPUT_EVENT_QUEUED_APZ_MOUSE_MOVE_MS,
aEvent->mTimeStamp);
}
GetPresContext()->RecordInteractionTime(
nsPresContext::InteractionType::MouseMoveInteraction,
aEvent->mTimeStamp);
return;
case eWheel:
if (aEvent->mFlags.mHandledByAPZ) {
Telemetry::AccumulateTimeDelta(
Telemetry::INPUT_EVENT_QUEUED_APZ_WHEEL_MS, aEvent->mTimeStamp);
}
return;
case eTouchMove:
if (aEvent->mFlags.mHandledByAPZ) {
Telemetry::AccumulateTimeDelta(
Telemetry::INPUT_EVENT_QUEUED_APZ_TOUCH_MOVE_MS,
aEvent->mTimeStamp);
}
return;
default:
return;
}
}
void PresShell::EventHandler::RecordEventHandlingResponsePerformance(
const WidgetEvent* aEvent) {
if (!Telemetry::CanRecordBase() || aEvent->mTimeStamp.IsNull() ||
aEvent->mTimeStamp <= mPresShell->mLastOSWake ||
!aEvent->AsInputEvent()) {
return;
}
TimeStamp now = TimeStamp::Now();
double millis = (now - aEvent->mTimeStamp).ToMilliseconds();
Telemetry::Accumulate(Telemetry::INPUT_EVENT_RESPONSE_MS, millis);
if (GetDocument() &&
GetDocument()->GetReadyStateEnum() != Document::READYSTATE_COMPLETE) {
Telemetry::Accumulate(Telemetry::LOAD_INPUT_EVENT_RESPONSE_MS, millis);
}
if (!sLastInputProcessed || sLastInputProcessed < aEvent->mTimeStamp) {
if (sLastInputProcessed) {
// This input event was created after we handled the last one.
// Accumulate the previous events' coalesced duration.
double lastMillis =
(sLastInputProcessed - sLastInputCreated).ToMilliseconds();
Telemetry::Accumulate(Telemetry::INPUT_EVENT_RESPONSE_COALESCED_MS,
lastMillis);
if (MOZ_UNLIKELY(!PresShell::sProcessInteractable)) {
// For content process, we use the ready state of
// top-level-content-document to know if the process has finished the
// start-up.
// For parent process, see the topic
// 'sessionstore-one-or-no-tab-restored' in PresShell::Observe.
if (XRE_IsContentProcess() && GetDocument() &&
GetDocument()->IsTopLevelContentDocument()) {
switch (GetDocument()->GetReadyStateEnum()) {
case Document::READYSTATE_INTERACTIVE:
case Document::READYSTATE_COMPLETE:
PresShell::sProcessInteractable = true;
break;
default:
break;
}
}
}
if (MOZ_LIKELY(PresShell::sProcessInteractable)) {
Telemetry::Accumulate(Telemetry::INPUT_EVENT_RESPONSE_POST_STARTUP_MS,
lastMillis);
} else {
Telemetry::Accumulate(Telemetry::INPUT_EVENT_RESPONSE_STARTUP_MS,
lastMillis);
}
}
sLastInputCreated = aEvent->mTimeStamp;
} else if (aEvent->mTimeStamp < sLastInputCreated) {
// This event was created before the last input. May be processing out
// of order, so coalesce backwards, too.
sLastInputCreated = aEvent->mTimeStamp;
}
sLastInputProcessed = now;
}
// static
nsIPrincipal*
PresShell::EventHandler::GetDocumentPrincipalToCompareWithBlacklist(
PresShell& aPresShell) {
nsPresContext* presContext = aPresShell.GetPresContext();
if (NS_WARN_IF(!presContext)) {
return nullptr;
}
return presContext->Document()->GetPrincipalForPrefBasedHacks();
}
nsresult PresShell::EventHandler::DispatchEventToDOM(
WidgetEvent* aEvent, nsEventStatus* aEventStatus,
nsPresShellEventCB* aEventCB) {
nsresult rv = NS_OK;
nsCOMPtr<nsINode> eventTarget = mPresShell->mCurrentEventContent;
nsPresShellEventCB* eventCBPtr = aEventCB;
if (!eventTarget) {
nsCOMPtr<nsIContent> targetContent;
if (mPresShell->mCurrentEventFrame) {
rv = mPresShell->mCurrentEventFrame->GetContentForEvent(
aEvent, getter_AddRefs(targetContent));
}
if (NS_SUCCEEDED(rv) && targetContent) {
eventTarget = targetContent;
} else if (GetDocument()) {
eventTarget = GetDocument();
// If we don't have any content, the callback wouldn't probably
// do nothing.
eventCBPtr = nullptr;
}
}
if (eventTarget) {
if (eventTarget->OwnerDoc()->ShouldResistFingerprinting(
RFPTarget::WidgetEvents) &&
aEvent->IsBlockedForFingerprintingResistance()) {
aEvent->mFlags.mOnlySystemGroupDispatchInContent = true;
} else if (aEvent->mMessage == eKeyPress) {
// If eKeyPress event is marked as not dispatched in the default event
// group in web content, it's caused by non-printable key or key
// combination. In this case, UI Events declares that browsers
// shouldn't dispatch keypress event. However, some web apps may be
// broken with this strict behavior due to historical issue.
// Therefore, we need to keep dispatching keypress event for such keys
// even with breaking the standard.
// Similarly, the other browsers sets non-zero value of keyCode or
// charCode of keypress event to the other. Therefore, we should
// behave so, however, some web apps may be broken. On such web apps,
// we should keep using legacy our behavior.
if (!mPresShell->mInitializedWithKeyPressEventDispatchingBlacklist) {
mPresShell->mInitializedWithKeyPressEventDispatchingBlacklist = true;
nsCOMPtr<nsIPrincipal> principal =
GetDocumentPrincipalToCompareWithBlacklist(*mPresShell);
if (principal) {
mPresShell->mForceDispatchKeyPressEventsForNonPrintableKeys =
principal->IsURIInPrefList(
"dom.keyboardevent.keypress.hack.dispatch_non_printable_"
"keys") ||
principal->IsURIInPrefList(
"dom.keyboardevent.keypress.hack."
"dispatch_non_printable_keys.addl");
mPresShell->mForceUseLegacyKeyCodeAndCharCodeValues |=
principal->IsURIInPrefList(
"dom.keyboardevent.keypress.hack."
"use_legacy_keycode_and_charcode") ||
principal->IsURIInPrefList(
"dom.keyboardevent.keypress.hack."
"use_legacy_keycode_and_charcode.addl");
}
}
if (mPresShell->mForceDispatchKeyPressEventsForNonPrintableKeys) {
aEvent->mFlags.mOnlySystemGroupDispatchInContent = false;
}
if (mPresShell->mForceUseLegacyKeyCodeAndCharCodeValues) {
aEvent->AsKeyboardEvent()->mUseLegacyKeyCodeAndCharCodeValues = true;
}
}
if (aEvent->mClass == eCompositionEventClass) {
RefPtr<nsPresContext> presContext = GetPresContext();
RefPtr<BrowserParent> browserParent =
IMEStateManager::GetActiveBrowserParent();
IMEStateManager::DispatchCompositionEvent(
eventTarget, presContext, browserParent, aEvent->AsCompositionEvent(),
aEventStatus, eventCBPtr);
} else {
if (aEvent->mClass == eMouseEventClass) {
PresShell::sMouseButtons = aEvent->AsMouseEvent()->mButtons;
}
RefPtr<nsPresContext> presContext = GetPresContext();
EventDispatcher::Dispatch(eventTarget, presContext, aEvent, nullptr,
aEventStatus, eventCBPtr);
}
}
return rv;
}
void PresShell::EventHandler::DispatchTouchEventToDOM(
WidgetEvent* aEvent, nsEventStatus* aEventStatus,
nsPresShellEventCB* aEventCB, bool aTouchIsNew) {
// calling preventDefault on touchstart or the first touchmove for a
// point prevents mouse events. calling it on the touchend should
// prevent click dispatching.
bool canPrevent = (aEvent->mMessage == eTouchStart) ||
(aEvent->mMessage == eTouchMove && aTouchIsNew) ||
(aEvent->mMessage == eTouchEnd);
bool preventDefault = false;
nsEventStatus tmpStatus = nsEventStatus_eIgnore;
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
// loop over all touches and dispatch events on any that have changed
for (dom::Touch* touch : touchEvent->mTouches) {
// We should remove all suppressed touch instances in
// TouchManager::PreHandleEvent.
MOZ_ASSERT(!touch->mIsTouchEventSuppressed);
if (!touch || !touch->mChanged) {
continue;
}
nsCOMPtr<EventTarget> targetPtr = touch->mTarget;
nsCOMPtr<nsIContent> content = do_QueryInterface(targetPtr);
if (!content) {
continue;
}
Document* doc = content->OwnerDoc();
nsIContent* capturingContent = PresShell::GetCapturingContent();
if (capturingContent) {
if (capturingContent->OwnerDoc() != doc) {
// Wrong document, don't dispatch anything.
continue;
}
content = capturingContent;
}
// copy the event
MOZ_ASSERT(touchEvent->IsTrusted());
WidgetTouchEvent newEvent(true, touchEvent->mMessage, touchEvent->mWidget);
newEvent.AssignTouchEventData(*touchEvent, false);
newEvent.mTarget = targetPtr;
newEvent.mFlags.mHandledByAPZ = touchEvent->mFlags.mHandledByAPZ;
RefPtr<PresShell> contentPresShell;
if (doc == GetDocument()) {
contentPresShell = doc->GetPresShell();
if (contentPresShell) {
// XXXsmaug huge hack. Pushing possibly capturing content,
// even though event target is something else.
contentPresShell->PushCurrentEventInfo(content->GetPrimaryFrame(),
content);
}
}
RefPtr<nsPresContext> presContext = doc->GetPresContext();
if (!presContext) {
if (contentPresShell) {
contentPresShell->PopCurrentEventInfo();
}
continue;
}
tmpStatus = nsEventStatus_eIgnore;
EventDispatcher::Dispatch(targetPtr, presContext, &newEvent, nullptr,
&tmpStatus, aEventCB);
if (nsEventStatus_eConsumeNoDefault == tmpStatus ||
newEvent.mFlags.mMultipleActionsPrevented) {
preventDefault = true;
}
if (newEvent.mFlags.mMultipleActionsPrevented) {
touchEvent->mFlags.mMultipleActionsPrevented = true;
}
if (contentPresShell) {
contentPresShell->PopCurrentEventInfo();
}
}
if (preventDefault && canPrevent) {
*aEventStatus = nsEventStatus_eConsumeNoDefault;
} else {
*aEventStatus = nsEventStatus_eIgnore;
}
}
// Dispatch event to content only (NOT full processing)
// See also HandleEventWithTarget which does full event processing.
nsresult PresShell::HandleDOMEventWithTarget(nsIContent* aTargetContent,
WidgetEvent* aEvent,
nsEventStatus* aStatus) {
nsresult rv = NS_OK;
PushCurrentEventInfo(nullptr, aTargetContent);
// Bug 41013: Check if the event should be dispatched to content.
// It's possible that we are in the middle of destroying the window
// and the js context is out of date. This check detects the case
// that caused a crash in bug 41013, but there may be a better way
// to handle this situation!
nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
if (container) {
// Dispatch event to content
rv = EventDispatcher::Dispatch(aTargetContent, mPresContext, aEvent,
nullptr, aStatus);
}
PopCurrentEventInfo();
return rv;
}
// See the method above.
nsresult PresShell::HandleDOMEventWithTarget(nsIContent* aTargetContent,
Event* aEvent,
nsEventStatus* aStatus) {
nsresult rv = NS_OK;
PushCurrentEventInfo(nullptr, aTargetContent);
nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
if (container) {
rv = EventDispatcher::DispatchDOMEvent(aTargetContent, nullptr, aEvent,
mPresContext, aStatus);
}
PopCurrentEventInfo();
return rv;
}
bool PresShell::EventHandler::AdjustContextMenuKeyEvent(
WidgetMouseEvent* aMouseEvent) {
// if a menu is open, open the context menu relative to the active item on the
// menu.
if (nsXULPopupManager* pm = nsXULPopupManager::GetInstance()) {
nsIFrame* popupFrame = pm->GetTopPopup(widget::PopupType::Menu);
if (popupFrame) {
nsIFrame* itemFrame = (static_cast<nsMenuPopupFrame*>(popupFrame))
->GetCurrentMenuItemFrame();
if (!itemFrame) itemFrame = popupFrame;
nsCOMPtr<nsIWidget> widget = popupFrame->GetNearestWidget();
aMouseEvent->mWidget = widget;
LayoutDeviceIntPoint widgetPoint = widget->WidgetToScreenOffset();
aMouseEvent->mRefPoint =
LayoutDeviceIntPoint::FromAppUnitsToNearest(
itemFrame->GetScreenRectInAppUnits().BottomLeft(),
itemFrame->PresContext()->AppUnitsPerDevPixel()) -
widgetPoint;
mPresShell->mCurrentEventContent = itemFrame->GetContent();
mPresShell->mCurrentEventFrame = itemFrame;
return true;
}
}
// If we're here because of the key-equiv for showing context menus, we
// have to twiddle with the NS event to make sure the context menu comes
// up in the upper left of the relevant content area before we create
// the DOM event. Since we never call InitMouseEvent() on the event,
// the client X/Y will be 0,0. We can make use of that if the widget is null.
// Use the root view manager's widget since it's most likely to have one,
// and the coordinates returned by GetCurrentItemAndPositionForElement
// are relative to the widget of the root of the root view manager.
nsRootPresContext* rootPC = GetPresContext()->GetRootPresContext();
aMouseEvent->mRefPoint = LayoutDeviceIntPoint(0, 0);
if (rootPC) {
aMouseEvent->mWidget =
rootPC->PresShell()->GetViewManager()->GetRootWidget();
if (aMouseEvent->mWidget) {
// default the refpoint to the topleft of our document
nsPoint offset(0, 0);
nsIFrame* rootFrame = FrameConstructor()->GetRootFrame();
if (rootFrame) {
nsView* view = rootFrame->GetClosestView(&offset);
offset += view->GetOffsetToWidget(aMouseEvent->mWidget);
aMouseEvent->mRefPoint = LayoutDeviceIntPoint::FromAppUnitsToNearest(
offset, GetPresContext()->AppUnitsPerDevPixel());
}
}
} else {
aMouseEvent->mWidget = nullptr;
}
// see if we should use the caret position for the popup
LayoutDeviceIntPoint caretPoint;
// Beware! This may flush notifications via synchronous
// ScrollSelectionIntoView.
if (PrepareToUseCaretPosition(MOZ_KnownLive(aMouseEvent->mWidget),
caretPoint)) {
// caret position is good
int32_t devPixelRatio = GetPresContext()->AppUnitsPerDevPixel();
caretPoint = LayoutDeviceIntPoint::FromAppUnitsToNearest(
ViewportUtils::LayoutToVisual(
LayoutDeviceIntPoint::ToAppUnits(caretPoint, devPixelRatio),
GetPresContext()->PresShell()),
devPixelRatio);
aMouseEvent->mRefPoint = caretPoint;
return true;
}
// If we're here because of the key-equiv for showing context menus, we
// have to reset the event target to the currently focused element. Get it
// from the focus controller.
RefPtr<Element> currentFocus;
nsFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm) {
currentFocus = fm->GetFocusedElement();
}
// Reset event coordinates relative to focused frame in view
if (currentFocus) {
nsCOMPtr<nsIContent> currentPointElement;
GetCurrentItemAndPositionForElement(
currentFocus, getter_AddRefs(currentPointElement),
aMouseEvent->mRefPoint, MOZ_KnownLive(aMouseEvent->mWidget));
if (currentPointElement) {
mPresShell->mCurrentEventContent = currentPointElement;
mPresShell->mCurrentEventFrame = nullptr;
mPresShell->GetCurrentEventFrame();
}
}
return true;
}
// PresShell::EventHandler::PrepareToUseCaretPosition
//
// This checks to see if we should use the caret position for popup context
// menus. Returns true if the caret position should be used, and the
// coordinates of that position is returned in aTargetPt. This function
// will also scroll the window as needed to make the caret visible.
//
// The event widget should be the widget that generated the event, and
// whose coordinate system the resulting event's mRefPoint should be
// relative to. The returned point is in device pixels realtive to the
// widget passed in.
bool PresShell::EventHandler::PrepareToUseCaretPosition(
nsIWidget* aEventWidget, LayoutDeviceIntPoint& aTargetPt) {
nsresult rv;
// check caret visibility
RefPtr<nsCaret> caret = mPresShell->GetCaret();
NS_ENSURE_TRUE(caret, false);
bool caretVisible = caret->IsVisible();
if (!caretVisible) return false;
// caret selection, this is a temporary weak reference, so no refcounting is
// needed
Selection* domSelection = caret->GetSelection();
NS_ENSURE_TRUE(domSelection, false);
// since the match could be an anonymous textnode inside a
// <textarea> or text <input>, we need to get the outer frame
// note: frames are not refcounted
nsIFrame* frame = nullptr; // may be nullptr
nsINode* node = domSelection->GetFocusNode();
NS_ENSURE_TRUE(node, false);
nsCOMPtr<nsIContent> content = nsIContent::FromNode(node);
if (content) {
nsIContent* nonNative = content->FindFirstNonChromeOnlyAccessContent();
content = nonNative;
}
if (content) {
// It seems like ScrollSelectionIntoView should be enough, but it's
// not. The problem is that scrolling the selection into view when it is
// below the current viewport will align the top line of the frame exactly
// with the bottom of the window. This is fine, BUT, the popup event causes
// the control to be re-focused which does this exact call to
// ScrollContentIntoView, which has a one-pixel disagreement of whether the
// frame is actually in view. The result is that the frame is aligned with
// the top of the window, but the menu is still at the bottom.
//
// Doing this call first forces the frame to be in view, eliminating the
// problem. The only difference in the result is that if your cursor is in
// an edit box below the current view, you'll get the edit box aligned with
// the top of the window. This is arguably better behavior anyway.
rv = MOZ_KnownLive(mPresShell)
->ScrollContentIntoView(
content,
ScrollAxis(WhereToScroll::Nearest, WhenToScroll::IfNotVisible),
ScrollAxis(WhereToScroll::Nearest, WhenToScroll::IfNotVisible),
ScrollFlags::ScrollOverflowHidden);
NS_ENSURE_SUCCESS(rv, false);
frame = content->GetPrimaryFrame();
NS_WARNING_ASSERTION(frame, "No frame for focused content?");
}
// Actually scroll the selection (ie caret) into view. Note that this must
// be synchronous since we will be checking the caret position on the screen.
//
// Be easy about errors, and just don't scroll in those cases. Better to have
// the correct menu at a weird place than the wrong menu.
// After ScrollSelectionIntoView(), the pending notifications might be
// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
nsCOMPtr<nsISelectionController> selCon;
if (frame)
frame->GetSelectionController(GetPresContext(), getter_AddRefs(selCon));
else
selCon = static_cast<nsISelectionController*>(mPresShell);
if (selCon) {
rv = selCon->ScrollSelectionIntoView(
nsISelectionController::SELECTION_NORMAL,
nsISelectionController::SELECTION_FOCUS_REGION,
nsISelectionController::SCROLL_SYNCHRONOUS);
NS_ENSURE_SUCCESS(rv, false);
}
nsPresContext* presContext = GetPresContext();
// get caret position relative to the closest view
nsRect caretCoords;
nsIFrame* caretFrame = caret->GetGeometry(&caretCoords);
if (!caretFrame) return false;
nsPoint viewOffset;
nsView* view = caretFrame->GetClosestView(&viewOffset);
if (!view) return false;
// and then get the caret coords relative to the event widget
if (aEventWidget) {
viewOffset += view->GetOffsetToWidget(aEventWidget);
}
caretCoords.MoveBy(viewOffset);
// caret coordinates are in app units, convert to pixels
aTargetPt.x =
presContext->AppUnitsToDevPixels(caretCoords.x + caretCoords.width);
aTargetPt.y =
presContext->AppUnitsToDevPixels(caretCoords.y + caretCoords.height);
// make sure rounding doesn't return a pixel which is outside the caret
// (e.g. one line lower)
aTargetPt.y -= 1;
return true;
}
void PresShell::EventHandler::GetCurrentItemAndPositionForElement(
Element* aFocusedElement, nsIContent** aTargetToUse,
LayoutDeviceIntPoint& aTargetPt, nsIWidget* aRootWidget) {
nsCOMPtr<nsIContent> focusedContent = aFocusedElement;
MOZ_KnownLive(mPresShell)
->ScrollContentIntoView(focusedContent, ScrollAxis(), ScrollAxis(),
ScrollFlags::ScrollOverflowHidden);
nsPresContext* presContext = GetPresContext();
bool istree = false, checkLineHeight = true;
nscoord extraTreeY = 0;
// Set the position to just underneath the current item for multi-select
// lists or just underneath the selected item for single-select lists. If
// the element is not a list, or there is no selection, leave the position
// as is.
nsCOMPtr<Element> item;
nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelect =
aFocusedElement->AsXULMultiSelectControl();
if (multiSelect) {
checkLineHeight = false;
int32_t currentIndex;
multiSelect->GetCurrentIndex(&currentIndex);
if (currentIndex >= 0) {
RefPtr<XULTreeElement> tree = XULTreeElement::FromNode(focusedContent);
// Tree view special case (tree items have no frames)
// Get the focused row and add its coordinates, which are already in
// pixels
// XXX Boris, should we create a new interface so that this doesn't
// need to know about trees? Something like nsINodelessChildCreator
// which could provide the current focus coordinates?
if (tree) {
tree->EnsureRowIsVisible(currentIndex);
int32_t firstVisibleRow = tree->GetFirstVisibleRow();
int32_t rowHeight = tree->RowHeight();
extraTreeY += nsPresContext::CSSPixelsToAppUnits(
(currentIndex - firstVisibleRow + 1) * rowHeight);
istree = true;
RefPtr<nsTreeColumns> cols = tree->GetColumns();
if (cols) {
nsTreeColumn* col = cols->GetFirstColumn();
if (col) {
RefPtr<Element> colElement = col->Element();
nsIFrame* frame = colElement->GetPrimaryFrame();
if (frame) {
extraTreeY += frame->GetSize().height;
}
}
}
} else {
multiSelect->GetCurrentItem(getter_AddRefs(item));
}
}
} else {
// don't check menulists as the selected item will be inside a popup.
nsCOMPtr<nsIDOMXULMenuListElement> menulist =
aFocusedElement->AsXULMenuList();
if (!menulist) {
nsCOMPtr<nsIDOMXULSelectControlElement> select =
aFocusedElement->AsXULSelectControl();
if (select) {
checkLineHeight = false;
select->GetSelectedItem(getter_AddRefs(item));
}
}
}
if (item) {
focusedContent = item;
}
nsIFrame* frame = focusedContent->GetPrimaryFrame();
if (frame) {
NS_ASSERTION(
frame->PresContext() == GetPresContext(),
"handling event for focused content that is not in our document?");
nsPoint frameOrigin(0, 0);
// Get the frame's origin within its view
nsView* view = frame->GetClosestView(&frameOrigin);
NS_ASSERTION(view, "No view for frame");
// View's origin relative the widget
if (aRootWidget) {
frameOrigin += view->GetOffsetToWidget(aRootWidget);
}
// Start context menu down and to the right from top left of frame
// use the lineheight. This is a good distance to move the context
// menu away from the top left corner of the frame. If we always
// used the frame height, the context menu could end up far away,
// for example when we're focused on linked images.
// On the other hand, we want to use the frame height if it's less
// than the current line height, so that the context menu appears
// associated with the correct frame.
nscoord extra = 0;
if (!istree) {
extra = frame->GetSize().height;
if (checkLineHeight) {
nsIScrollableFrame* scrollFrame =
nsLayoutUtils::GetNearestScrollableFrame(
frame, nsLayoutUtils::SCROLLABLE_INCLUDE_HIDDEN |
nsLayoutUtils::SCROLLABLE_FIXEDPOS_FINDS_ROOT);
if (scrollFrame) {
nsSize scrollAmount = scrollFrame->GetLineScrollAmount();
nsIFrame* f = do_QueryFrame(scrollFrame);
int32_t APD = presContext->AppUnitsPerDevPixel();
int32_t scrollAPD = f->PresContext()->AppUnitsPerDevPixel();
scrollAmount = scrollAmount.ScaleToOtherAppUnits(scrollAPD, APD);
if (extra > scrollAmount.height) {
extra = scrollAmount.height;
}
}
}
}
aTargetPt.x = presContext->AppUnitsToDevPixels(frameOrigin.x);
aTargetPt.y =
presContext->AppUnitsToDevPixels(frameOrigin.y + extra + extraTreeY);
}
NS_IF_ADDREF(*aTargetToUse = focusedContent);
}
bool PresShell::ShouldIgnoreInvalidation() {
return mPaintingSuppressed || !mIsActive || mIsNeverPainting;
}
void PresShell::WillPaint() {
// Check the simplest things first. In particular, it's important to
// check mIsActive before making any of the more expensive calls such
// as GetRootPresContext, for the case of a browser with a large
// number of tabs.
// Don't bother doing anything if some viewmanager in our tree is painting
// while we still have painting suppressed or we are not active.
if (!mIsActive || mPaintingSuppressed || !IsVisible()) {
return;
}
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (!rootPresContext) {
// In some edge cases, such as when we don't have a root frame yet,
// we can't find the root prescontext. There's nothing to do in that
// case.
return;
}
rootPresContext->FlushWillPaintObservers();
if (mIsDestroying) return;
// Process reflows, if we have them, to reduce flicker due to invalidates and
// reflow being interspersed. Note that we _do_ allow this to be
// interruptible; if we can't do all the reflows it's better to flicker a bit
// than to freeze up.
FlushPendingNotifications(
ChangesToFlush(FlushType::InterruptibleLayout, false));
}
void PresShell::DidPaintWindow() {
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext != mPresContext) {
// This could be a popup's presshell. No point in notifying XPConnect
// about compositing of popups.
return;
}
if (!mHasReceivedPaintMessage) {
mHasReceivedPaintMessage = true;
nsCOMPtr<nsIObserverService> obsvc = services::GetObserverService();
if (obsvc && mDocument) {
nsPIDOMWindowOuter* window = mDocument->GetWindow();
if (window && nsGlobalWindowOuter::Cast(window)->IsChromeWindow()) {
obsvc->NotifyObservers(window, "widget-first-paint", nullptr);
}
}
}
}
bool PresShell::IsVisible() const {
if (!mIsActive || !mViewManager) return false;
nsView* view = mViewManager->GetRootView();
if (!view) return true;
// inner view of subdoc frame
view = view->GetParent();
if (!view) return true;
// subdoc view
view = view->GetParent();
if (!view) return true;
nsIFrame* frame = view->GetFrame();
if (!frame) return true;
return frame->IsVisibleConsideringAncestors(
nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY);
}
void PresShell::SuppressDisplayport(bool aEnabled) {
if (aEnabled) {
mActiveSuppressDisplayport++;
} else if (mActiveSuppressDisplayport > 0) {
bool isSuppressed = IsDisplayportSuppressed();
mActiveSuppressDisplayport--;
if (isSuppressed && !IsDisplayportSuppressed()) {
// We unsuppressed the displayport, trigger a paint
if (nsIFrame* rootFrame = mFrameConstructor->GetRootFrame()) {
rootFrame->SchedulePaint();
}
}
}
}
static bool sDisplayPortSuppressionRespected = true;
void PresShell::RespectDisplayportSuppression(bool aEnabled) {
bool isSuppressed = IsDisplayportSuppressed();
sDisplayPortSuppressionRespected = aEnabled;
if (isSuppressed && !IsDisplayportSuppressed()) {
// We unsuppressed the displayport, trigger a paint
if (nsIFrame* rootFrame = mFrameConstructor->GetRootFrame()) {
rootFrame->SchedulePaint();
}
}
}
bool PresShell::IsDisplayportSuppressed() {
return sDisplayPortSuppressionRespected && mActiveSuppressDisplayport > 0;
}
static CallState FreezeSubDocument(Document& aDocument) {
if (PresShell* presShell = aDocument.GetPresShell()) {
presShell->Freeze();
}
return CallState::Continue;
}
void PresShell::Freeze(bool aIncludeSubDocuments) {
mUpdateApproximateFrameVisibilityEvent.Revoke();
MaybeReleaseCapturingContent();
if (mCaret) {
SetCaretEnabled(false);
}
mPaintingSuppressed = true;
if (aIncludeSubDocuments && mDocument) {
mDocument->EnumerateSubDocuments(FreezeSubDocument);
}
nsPresContext* presContext = GetPresContext();
if (presContext) {
presContext->DisableInteractionTimeRecording();
if (presContext->RefreshDriver()->GetPresContext() == presContext) {
presContext->RefreshDriver()->Freeze();
}
if (nsPresContext* rootPresContext = presContext->GetRootPresContext()) {
rootPresContext->ResetUserInputEventsAllowed();
}
}
mFrozen = true;
if (mDocument) {
UpdateImageLockingState();
}
}
void PresShell::FireOrClearDelayedEvents(bool aFireEvents) {
mNoDelayedMouseEvents = false;
mNoDelayedKeyEvents = false;
if (!aFireEvents) {
mDelayedEvents.Clear();
return;
}
if (mDocument) {
RefPtr<Document> doc = mDocument;
while (!mIsDestroying && mDelayedEvents.Length() &&
!doc->EventHandlingSuppressed()) {
UniquePtr<DelayedEvent> ev = std::move(mDelayedEvents[0]);
mDelayedEvents.RemoveElementAt(0);
if (ev->IsKeyPressEvent() && mIsLastKeyDownCanceled) {
continue;
}
ev->Dispatch();
}
if (!doc->EventHandlingSuppressed()) {
mDelayedEvents.Clear();
}
}
}
void PresShell::Thaw(bool aIncludeSubDocuments) {
nsPresContext* presContext = GetPresContext();
if (presContext &&
presContext->RefreshDriver()->GetPresContext() == presContext) {
presContext->RefreshDriver()->Thaw();
}
if (aIncludeSubDocuments && mDocument) {
mDocument->EnumerateSubDocuments([](Document& aSubDoc) {
if (PresShell* presShell = aSubDoc.GetPresShell()) {
presShell->Thaw();
}
return CallState::Continue;
});
}
// Get the activeness of our presshell, as this might have changed
// while we were in the bfcache
ActivenessMaybeChanged();
// We're now unfrozen
mFrozen = false;
UpdateImageLockingState();
UnsuppressPainting();
// In case the above UnsuppressPainting call didn't start the
// refresh driver, we manually start the refresh driver to
// ensure nsPresContext::MaybeIncreaseMeasuredTicksSinceLoading
// can be called for user input events handling.
if (presContext && presContext->IsRoot()) {
if (!presContext->RefreshDriver()->HasPendingTick()) {
presContext->RefreshDriver()->InitializeTimer();
}
}
}
//--------------------------------------------------------
// Start of protected and private methods on the PresShell
//--------------------------------------------------------
void PresShell::MaybeScheduleReflow() {
ASSERT_REFLOW_SCHEDULED_STATE();
if (mObservingLayoutFlushes || mIsDestroying || mIsReflowing ||
mDirtyRoots.IsEmpty())
return;
if (!mPresContext->HasPendingInterrupt() || !ScheduleReflowOffTimer()) {
ScheduleReflow();
}
ASSERT_REFLOW_SCHEDULED_STATE();
}
void PresShell::ScheduleReflow() {
ASSERT_REFLOW_SCHEDULED_STATE();
DoObserveLayoutFlushes();
ASSERT_REFLOW_SCHEDULED_STATE();
}
void PresShell::WillCauseReflow() {
nsContentUtils::AddScriptBlocker();
++mChangeNestCount;
}
void PresShell::DidCauseReflow() {
NS_ASSERTION(mChangeNestCount != 0, "Unexpected call to DidCauseReflow()");
--mChangeNestCount;
nsContentUtils::RemoveScriptBlocker();
}
void PresShell::WillDoReflow() {
mDocument->FlushUserFontSet();
mPresContext->FlushCounterStyles();
mPresContext->FlushFontFeatureValues();
mPresContext->FlushFontPaletteValues();
mLastReflowStart = GetPerformanceNowUnclamped();
}
void PresShell::DidDoReflow(bool aInterruptible) {
MOZ_ASSERT(mPendingDidDoReflow);
if (!nsContentUtils::IsSafeToRunScript()) {
// If we're reflowing while script-blocked (e.g. from container query
// updates), defer our reflow callbacks until the end of our next layout
// flush.
SetNeedLayoutFlush();
return;
}
auto clearPendingDidDoReflow =
MakeScopeExit([&] { mPendingDidDoReflow = false; });
mHiddenContentInForcedLayout.Clear();
HandlePostedReflowCallbacks(aInterruptible);
if (mIsDestroying) {
return;
}
{
nsAutoScriptBlocker scriptBlocker;
AutoAssertNoFlush noReentrantFlush(*this);
if (nsCOMPtr<nsIDocShell> docShell = mPresContext->GetDocShell()) {
DOMHighResTimeStamp now = GetPerformanceNowUnclamped();
docShell->NotifyReflowObservers(aInterruptible, mLastReflowStart, now);
}
if (StaticPrefs::layout_reflow_synthMouseMove()) {
SynthesizeMouseMove(false);
}
mPresContext->NotifyMissingFonts();
}
if (mIsDestroying) {
return;
}
if (mDirtyRoots.IsEmpty()) {
// We only unsuppress painting if we're out of reflows. It's pointless to
// do so if reflows are still pending, since reflows are just going to
// thrash the frames around some more. By waiting we avoid an overeager
// "jitter" effect.
if (mShouldUnsuppressPainting) {
mShouldUnsuppressPainting = false;
UnsuppressAndInvalidate();
}
} else {
// If any new reflow commands were enqueued during the reflow, schedule
// another reflow event to process them. Note that we want to do this
// after DidDoReflow(), since that method can change whether there are
// dirty roots around by flushing, and there's no point in posting a
// reflow event just to have the flush revoke it.
MaybeScheduleReflow();
// And record that we might need flushing
SetNeedLayoutFlush();
}
}
DOMHighResTimeStamp PresShell::GetPerformanceNowUnclamped() {
DOMHighResTimeStamp now = 0;
if (nsPIDOMWindowInner* window = mDocument->GetInnerWindow()) {
Performance* perf = window->GetPerformance();
if (perf) {
now = perf->NowUnclamped();
}
}
return now;
}
void PresShell::sReflowContinueCallback(nsITimer* aTimer, void* aPresShell) {
RefPtr<PresShell> self = static_cast<PresShell*>(aPresShell);
MOZ_ASSERT(aTimer == self->mReflowContinueTimer, "Unexpected timer");
self->mReflowContinueTimer = nullptr;
self->ScheduleReflow();
}
bool PresShell::ScheduleReflowOffTimer() {
MOZ_ASSERT(!mObservingLayoutFlushes, "Shouldn't get here");
ASSERT_REFLOW_SCHEDULED_STATE();
if (!mReflowContinueTimer) {
nsresult rv = NS_NewTimerWithFuncCallback(
getter_AddRefs(mReflowContinueTimer), sReflowContinueCallback, this, 30,
nsITimer::TYPE_ONE_SHOT, "sReflowContinueCallback",
GetMainThreadSerialEventTarget());
return NS_SUCCEEDED(rv);
}
return true;
}
bool PresShell::DoReflow(nsIFrame* target, bool aInterruptible,
OverflowChangedTracker* aOverflowTracker) {
[[maybe_unused]] nsIURI* uri = mDocument->GetDocumentURI();
AUTO_PROFILER_LABEL_DYNAMIC_NSCSTRING_RELEVANT_FOR_JS(
"Reflow", LAYOUT_Reflow, uri ? uri->GetSpecOrDefault() : "N/A"_ns);
LAYOUT_TELEMETRY_RECORD_BASE(Reflow);
PerfStats::AutoMetricRecording<PerfStats::Metric::Reflowing> autoRecording;
gfxTextPerfMetrics* tp = mPresContext->GetTextPerfMetrics();
TimeStamp timeStart;
if (tp) {
tp->Accumulate();
tp->reflowCount++;
timeStart = TimeStamp::Now();
}
// Schedule a paint, but don't actually mark this frame as changed for
// retained DL building purposes. If any child frames get moved, then
// they will schedule paint again. We could probaby skip this, and just
// schedule a similar paint when a frame is deleted.
target->SchedulePaint(nsIFrame::PAINT_DEFAULT, false);
Maybe<uint64_t> innerWindowID;
if (auto* window = mDocument->GetInnerWindow()) {
innerWindowID = Some(window->WindowID());
}
AutoProfilerTracing tracingLayoutFlush(
"Paint", aInterruptible ? "Reflow (interruptible)" : "Reflow (sync)",
geckoprofiler::category::LAYOUT, std::move(mReflowCause), innerWindowID);
mReflowCause = nullptr;
FlushPendingScrollAnchorSelections();
if (mReflowContinueTimer) {
mReflowContinueTimer->Cancel();
mReflowContinueTimer = nullptr;
}
const bool isRoot = target == mFrameConstructor->GetRootFrame();
MOZ_ASSERT(isRoot || aOverflowTracker,
"caller must provide overflow tracker when reflowing "
"non-root frames");
// CreateReferenceRenderingContext can return nullptr
UniquePtr<gfxContext> rcx(CreateReferenceRenderingContext());
#ifdef DEBUG
mCurrentReflowRoot = target;
#endif
// If the target frame is the root of the frame hierarchy, then
// use all the available space. If it's simply a `reflow root',
// then use the target frame's size as the available space.
WritingMode wm = target->GetWritingMode();
LogicalSize size(wm);
if (isRoot) {
size = LogicalSize(wm, mPresContext->GetVisibleArea().Size());
} else {
size = target->GetLogicalSize();
}
OverflowAreas oldOverflow; // initialized and used only when !isRoot
if (!isRoot) {
oldOverflow = target->GetOverflowAreas();
}
NS_ASSERTION(!target->GetNextInFlow() && !target->GetPrevInFlow(),
"reflow roots should never split");
// Don't pass size directly to the reflow input, since a
// constrained height implies page/column breaking.
LogicalSize reflowSize(wm, size.ISize(wm), NS_UNCONSTRAINEDSIZE);
ReflowInput reflowInput(mPresContext, target, rcx.get(), reflowSize,
ReflowInput::InitFlag::CallerWillInit);
reflowInput.mOrthogonalLimit = size.BSize(wm);
if (isRoot) {
reflowInput.Init(mPresContext);
// When the root frame is being reflowed with unconstrained block-size
// (which happens when we're called from
// nsDocumentViewer::SizeToContent), we're effectively doing a
// resize in the block direction, since it changes the meaning of
// percentage block-sizes even if no block-sizes actually changed.
// The same applies when we reflow again after that computation. This is
// an unusual case, and isn't caught by ReflowInput::InitResizeFlags.
bool hasUnconstrainedBSize = size.BSize(wm) == NS_UNCONSTRAINEDSIZE;
if (hasUnconstrainedBSize || mLastRootReflowHadUnconstrainedBSize) {
reflowInput.SetBResize(true);
}
mLastRootReflowHadUnconstrainedBSize = hasUnconstrainedBSize;
} else {
// Initialize reflow input with current used border and padding,
// in case this was set specially by the parent frame when the reflow root
// was reflowed by its parent.
reflowInput.Init(mPresContext, Nothing(),
Some(target->GetLogicalUsedBorder(wm)),
Some(target->GetLogicalUsedPadding(wm)));
}
// fix the computed height
NS_ASSERTION(reflowInput.ComputedPhysicalMargin() == nsMargin(0, 0, 0, 0),
"reflow input should not set margin for reflow roots");
if (size.BSize(wm) != NS_UNCONSTRAINEDSIZE) {
nscoord computedBSize =
size.BSize(wm) -
reflowInput.ComputedLogicalBorderPadding(wm).BStartEnd(wm);
computedBSize = std::max(computedBSize, 0);
reflowInput.SetComputedBSize(computedBSize);
}
NS_ASSERTION(
reflowInput.ComputedISize() ==
size.ISize(wm) -
reflowInput.ComputedLogicalBorderPadding(wm).IStartEnd(wm),
"reflow input computed incorrect inline size");
mPresContext->ReflowStarted(aInterruptible);
mIsReflowing = true;
nsReflowStatus status;
ReflowOutput desiredSize(reflowInput);
target->Reflow(mPresContext, desiredSize, reflowInput, status);
// If an incremental reflow is initiated at a frame other than the
// root frame, then its desired size had better not change! If it's
// initiated at the root, then the size better not change unless its
// height was unconstrained to start with.
nsRect boundsRelativeToTarget =
nsRect(0, 0, desiredSize.Width(), desiredSize.Height());
const bool isBSizeLimitReflow =
isRoot && size.BSize(wm) == NS_UNCONSTRAINEDSIZE;
NS_ASSERTION(isBSizeLimitReflow || desiredSize.Size(wm) == size,
"non-root frame's desired size changed during an "
"incremental reflow");
NS_ASSERTION(status.IsEmpty(), "reflow roots should never split");
target->SetSize(boundsRelativeToTarget.Size());
// Always use boundsRelativeToTarget here, not desiredSize.InkOverflowRect(),
// because for root frames (where they could be different, since root frames
// are allowed to have overflow) the root view bounds need to match the
// viewport bounds; the view manager "window dimensions" code depends on it.
if (target->HasView()) {
nsContainerFrame::SyncFrameViewAfterReflow(
mPresContext, target, target->GetView(), boundsRelativeToTarget);
if (target->IsViewportFrame()) {
SyncWindowProperties(/* aSync = */ false);
}
}
target->DidReflow(mPresContext, nullptr);
if (target->IsInScrollAnchorChain()) {
ScrollAnchorContainer* container = ScrollAnchorContainer::FindFor(target);
PostPendingScrollAnchorAdjustment(container);
}
if (MOZ_UNLIKELY(isBSizeLimitReflow)) {
mPresContext->SetVisibleArea(boundsRelativeToTarget);
}
#ifdef DEBUG
mCurrentReflowRoot = nullptr;
#endif
if (!isRoot && oldOverflow != target->GetOverflowAreas()) {
// The overflow area changed. Propagate this change to ancestors.
aOverflowTracker->AddFrame(target->GetParent(),
OverflowChangedTracker::CHILDREN_CHANGED);
}
NS_ASSERTION(
mPresContext->HasPendingInterrupt() || mFramesToDirty.Count() == 0,
"Why do we need to dirty anything if not interrupted?");
mIsReflowing = false;
bool interrupted = mPresContext->HasPendingInterrupt();
if (interrupted) {
// Make sure target gets reflowed again.
for (const auto& key : mFramesToDirty) {
// Mark frames dirty until target frame.
for (nsIFrame* f = key; f && !f->IsSubtreeDirty(); f = f->GetParent()) {
f->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
if (f->IsFlexItem()) {
nsFlexContainerFrame::MarkCachedFlexMeasurementsDirty(f);
}
if (f == target) {
break;
}
}
}
NS_ASSERTION(target->IsSubtreeDirty(), "Why is the target not dirty?");
mDirtyRoots.Add(target);
SetNeedLayoutFlush();
// Clear mFramesToDirty after we've done the target->IsSubtreeDirty()
// assertion so that if it fails it's easier to see what's going on.
#ifdef NOISY_INTERRUPTIBLE_REFLOW
printf("mFramesToDirty.Count() == %u\n", mFramesToDirty.Count());
#endif /* NOISY_INTERRUPTIBLE_REFLOW */
mFramesToDirty.Clear();
// Any FlushPendingNotifications with interruptible reflows
// should be suppressed now. We don't want to do extra reflow work
// before our reflow event happens.
mWasLastReflowInterrupted = true;
MaybeScheduleReflow();
}
// dump text perf metrics for reflows with significant text processing
if (tp) {
if (tp->current.numChars > 100) {
TimeDuration reflowTime = TimeStamp::Now() - timeStart;
LogTextPerfStats(tp, this, tp->current, reflowTime.ToMilliseconds(),
eLog_reflow, nullptr);
}
tp->Accumulate();
}
return !interrupted;
}
#ifdef DEBUG
void PresShell::DoVerifyReflow() {
if (GetVerifyReflowEnable()) {
// First synchronously render what we have so far so that we can
// see it.
nsView* rootView = mViewManager->GetRootView();
mViewManager->InvalidateView(rootView);
FlushPendingNotifications(FlushType::Layout);
mInVerifyReflow = true;
bool ok = VerifyIncrementalReflow();
mInVerifyReflow = false;
if (VerifyReflowFlags::All & gVerifyReflowFlags) {
printf("ProcessReflowCommands: finished (%s)\n", ok ? "ok" : "failed");
}
if (!mDirtyRoots.IsEmpty()) {
printf("XXX yikes! reflow commands queued during verify-reflow\n");
}
}
}
#endif
// used with Telemetry metrics
#define NS_LONG_REFLOW_TIME_MS 5000
bool PresShell::ProcessReflowCommands(bool aInterruptible) {
if (mDirtyRoots.IsEmpty() && !mShouldUnsuppressPainting &&
!mPendingDidDoReflow) {
// Nothing to do; bail out
return true;
}
const bool wasProcessingReflowCommands = mProcessingReflowCommands;
auto restoreProcessingReflowCommands = MakeScopeExit(
[&] { mProcessingReflowCommands = wasProcessingReflowCommands; });
mProcessingReflowCommands = true;
auto timerStart = mozilla::TimeStamp::Now();
bool interrupted = false;
if (!mDirtyRoots.IsEmpty()) {
#ifdef DEBUG
if (VerifyReflowFlags::DumpCommands & gVerifyReflowFlags) {
printf("ProcessReflowCommands: begin incremental reflow\n");
}
#endif
// If reflow is interruptible, then make a note of our deadline.
const PRIntervalTime deadline =
aInterruptible
? PR_IntervalNow() + PR_MicrosecondsToInterval(gMaxRCProcessingTime)
: (PRIntervalTime)0;
// Scope for the reflow entry point
nsAutoScriptBlocker scriptBlocker;
WillDoReflow();
AUTO_LAYOUT_PHASE_ENTRY_POINT(GetPresContext(), Reflow);
nsViewManager::AutoDisableRefresh refreshBlocker(mViewManager);
OverflowChangedTracker overflowTracker;
do {
// Send an incremental reflow notification to the target frame.
nsIFrame* target = mDirtyRoots.PopShallowestRoot();
if (!target->IsSubtreeDirty()) {
// It's not dirty anymore, which probably means the notification
// was posted in the middle of a reflow (perhaps with a reflow
// root in the middle). Don't do anything.
continue;
}
interrupted = !DoReflow(target, aInterruptible, &overflowTracker);
// Keep going until we're out of reflow commands, or we've run
// past our deadline, or we're interrupted.
} while (!interrupted && !mDirtyRoots.IsEmpty() &&
(!aInterruptible || PR_IntervalNow() < deadline));
interrupted = !mDirtyRoots.IsEmpty();
overflowTracker.Flush();
if (!interrupted) {
// We didn't get interrupted. Go ahead and perform scroll anchor
// adjustments.
FlushPendingScrollAnchorAdjustments();
}
mPendingDidDoReflow = true;
}
// Exiting the scriptblocker might have killed us. If we were processing
// scroll commands, let the outermost call deal with it.
if (!mIsDestroying && mPendingDidDoReflow && !wasProcessingReflowCommands) {
DidDoReflow(aInterruptible);
}
#ifdef DEBUG
if (VerifyReflowFlags::DumpCommands & gVerifyReflowFlags) {
printf("\nPresShell::ProcessReflowCommands() finished: this=%p\n",
(void*)this);
}
DoVerifyReflow();
#endif
{
TimeDuration elapsed = TimeStamp::Now() - timerStart;
int32_t intElapsed = int32_t(elapsed.ToMilliseconds());
if (intElapsed > NS_LONG_REFLOW_TIME_MS) {
Telemetry::Accumulate(Telemetry::LONG_REFLOW_INTERRUPTIBLE,
aInterruptible ? 1 : 0);
}
}
return !interrupted;
}
bool PresShell::DoFlushLayout(bool aInterruptible) {
mFrameConstructor->RecalcQuotesAndCounters();
return ProcessReflowCommands(aInterruptible);
}
void PresShell::WindowSizeMoveDone() {
if (mPresContext) {
EventStateManager::ClearGlobalActiveContent(nullptr);
ClearMouseCapture();
}
}
NS_IMETHODIMP
PresShell::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
if (mIsDestroying) {
NS_WARNING("our observers should have been unregistered by now");
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "memory-pressure")) {
if (!AssumeAllFramesVisible() &&
mPresContext->IsRootContentDocumentInProcess()) {
DoUpdateApproximateFrameVisibility(/* aRemoveOnly = */ true);
}
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, NS_WIDGET_WAKE_OBSERVER_TOPIC)) {
mLastOSWake = TimeStamp::Now();
return NS_OK;
}
// For parent process, user may expect the UI is interactable after a
// tab (previously opened page or home page) has restored.
if (!nsCRT::strcmp(aTopic, "sessionstore-one-or-no-tab-restored")) {
MOZ_ASSERT(XRE_IsParentProcess());
sProcessInteractable = true;
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->RemoveObserver(this, "sessionstore-one-or-no-tab-restored");
}
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "font-info-updated")) {
// See how gfxPlatform::ForceGlobalReflow encodes this.
bool needsReframe = aData && !!aData[0];
mPresContext->ForceReflowForFontInfoUpdate(needsReframe);
return NS_OK;
}
// The "look-and-feel-changed" notification for JS observers will be
// dispatched HandleGlobalThemeChange once LookAndFeel caches are cleared.
if (!nsCRT::strcmp(aTopic, "internal-look-and-feel-changed")) {
// See how LookAndFeel::NotifyChangedAllWindows encodes this.
auto kind = widget::ThemeChangeKind(aData[0]);
mPresContext->ThemeChanged(kind);
return NS_OK;
}
NS_WARNING("unrecognized topic in PresShell::Observe");
return NS_ERROR_FAILURE;
}
bool PresShell::AddRefreshObserver(nsARefreshObserver* aObserver,
FlushType aFlushType,
const char* aObserverDescription) {
nsPresContext* presContext = GetPresContext();
if (MOZ_UNLIKELY(!presContext)) {
return false;
}
presContext->RefreshDriver()->AddRefreshObserver(aObserver, aFlushType,
aObserverDescription);
return true;
}
bool PresShell::RemoveRefreshObserver(nsARefreshObserver* aObserver,
FlushType aFlushType) {
nsPresContext* presContext = GetPresContext();
return presContext && presContext->RefreshDriver()->RemoveRefreshObserver(
aObserver, aFlushType);
}
bool PresShell::AddPostRefreshObserver(nsAPostRefreshObserver* aObserver) {
nsPresContext* presContext = GetPresContext();
if (!presContext) {
return false;
}
presContext->RefreshDriver()->AddPostRefreshObserver(aObserver);
return true;
}
bool PresShell::RemovePostRefreshObserver(nsAPostRefreshObserver* aObserver) {
nsPresContext* presContext = GetPresContext();
if (!presContext) {
return false;
}
presContext->RefreshDriver()->RemovePostRefreshObserver(aObserver);
return true;
}
void PresShell::DoObserveStyleFlushes() {
MOZ_ASSERT(!ObservingStyleFlushes());
mObservingStyleFlushes = true;
if (MOZ_LIKELY(!mDocument->GetBFCacheEntry())) {
mPresContext->RefreshDriver()->AddStyleFlushObserver(this);
}
}
void PresShell::DoObserveLayoutFlushes() {
MOZ_ASSERT(!ObservingLayoutFlushes());
mObservingLayoutFlushes = true;
if (MOZ_LIKELY(!mDocument->GetBFCacheEntry())) {
mPresContext->RefreshDriver()->AddLayoutFlushObserver(this);
}
}
//------------------------------------------------------
// End of protected and private methods on the PresShell
//------------------------------------------------------
//------------------------------------------------------------------
//-- Delayed event Classes Impls
//------------------------------------------------------------------
PresShell::DelayedInputEvent::DelayedInputEvent()
: DelayedEvent(), mEvent(nullptr) {}
PresShell::DelayedInputEvent::~DelayedInputEvent() { delete mEvent; }
void PresShell::DelayedInputEvent::Dispatch() {
if (!mEvent || !mEvent->mWidget) {
return;
}
nsCOMPtr<nsIWidget> widget = mEvent->mWidget;
nsEventStatus status;
widget->DispatchEvent(mEvent, status);
}
PresShell::DelayedMouseEvent::DelayedMouseEvent(WidgetMouseEvent* aEvent) {
MOZ_DIAGNOSTIC_ASSERT(aEvent->IsTrusted());
WidgetMouseEvent* mouseEvent =
new WidgetMouseEvent(true, aEvent->mMessage, aEvent->mWidget,
aEvent->mReason, aEvent->mContextMenuTrigger);
mouseEvent->AssignMouseEventData(*aEvent, false);
mEvent = mouseEvent;
}
PresShell::DelayedKeyEvent::DelayedKeyEvent(WidgetKeyboardEvent* aEvent) {
MOZ_DIAGNOSTIC_ASSERT(aEvent->IsTrusted());
WidgetKeyboardEvent* keyEvent =
new WidgetKeyboardEvent(true, aEvent->mMessage, aEvent->mWidget);
keyEvent->AssignKeyEventData(*aEvent, false);
keyEvent->mFlags.mIsSynthesizedForTests =
aEvent->mFlags.mIsSynthesizedForTests;
keyEvent->mFlags.mIsSuppressedOrDelayed = true;
mEvent = keyEvent;
}
bool PresShell::DelayedKeyEvent::IsKeyPressEvent() {
return mEvent->mMessage == eKeyPress;
}
// Start of DEBUG only code
#ifdef DEBUG
static void LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg) {
nsAutoString n1, n2;
if (k1) {
k1->GetFrameName(n1);
} else {
n1.AssignLiteral(u"(null)");
}
if (k2) {
k2->GetFrameName(n2);
} else {
n2.AssignLiteral(u"(null)");
}
printf("verifyreflow: %s %p != %s %p %s\n",
NS_LossyConvertUTF16toASCII(n1).get(), (void*)k1,
NS_LossyConvertUTF16toASCII(n2).get(), (void*)k2, aMsg);
}
static void LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg,
const nsRect& r1, const nsRect& r2) {
printf("VerifyReflow Error:\n");
nsAutoString name;
if (k1) {
k1->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k1);
}
printf("{%d, %d, %d, %d} != \n", r1.x, r1.y, r1.width, r1.height);
if (k2) {
k2->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k2);
}
printf("{%d, %d, %d, %d}\n %s\n", r2.x, r2.y, r2.width, r2.height, aMsg);
}
static void LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg,
const nsIntRect& r1, const nsIntRect& r2) {
printf("VerifyReflow Error:\n");
nsAutoString name;
if (k1) {
k1->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k1);
}
printf("{%d, %d, %d, %d} != \n", r1.x, r1.y, r1.width, r1.height);
if (k2) {
k2->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k2);
}
printf("{%d, %d, %d, %d}\n %s\n", r2.x, r2.y, r2.width, r2.height, aMsg);
}
static bool CompareTrees(nsPresContext* aFirstPresContext,
nsIFrame* aFirstFrame,
nsPresContext* aSecondPresContext,
nsIFrame* aSecondFrame) {
if (!aFirstPresContext || !aFirstFrame || !aSecondPresContext ||
!aSecondFrame)
return true;
// XXX Evil hack to reduce false positives; I can't seem to figure
// out how to flush scrollbar changes correctly
// if (aFirstFrame->IsScrollbarFrame())
// return true;
bool ok = true;
const auto& childLists1 = aFirstFrame->ChildLists();
const auto& childLists2 = aSecondFrame->ChildLists();
auto iterLists1 = childLists1.begin();
auto iterLists2 = childLists2.begin();
do {
const nsFrameList& kids1 = iterLists1 != childLists1.end()
? iterLists1->mList
: nsFrameList::EmptyList();
const nsFrameList& kids2 = iterLists2 != childLists2.end()
? iterLists2->mList
: nsFrameList::EmptyList();
int32_t l1 = kids1.GetLength();
int32_t l2 = kids2.GetLength();
if (l1 != l2) {
ok = false;
LogVerifyMessage(kids1.FirstChild(), kids2.FirstChild(),
"child counts don't match: ");
printf("%d != %d\n", l1, l2);
if (!(VerifyReflowFlags::All & gVerifyReflowFlags)) {
break;
}
}
LayoutDeviceIntRect r1, r2;
nsView* v1;
nsView* v2;
for (auto kids1Iter = kids1.begin(), kids2Iter = kids2.begin();;
++kids1Iter, ++kids2Iter) {
nsIFrame* k1 = *kids1Iter;
nsIFrame* k2 = *kids2Iter;
if (((nullptr == k1) && (nullptr != k2)) ||
((nullptr != k1) && (nullptr == k2))) {
ok = false;
LogVerifyMessage(k1, k2, "child lists are different\n");
break;
} else if (nullptr != k1) {
// Verify that the frames are the same size
if (!k1->GetRect().IsEqualInterior(k2->GetRect())) {
ok = false;
LogVerifyMessage(k1, k2, "(frame rects)", k1->GetRect(),
k2->GetRect());
}
// Make sure either both have views or neither have views; if they
// do have views, make sure the views are the same size. If the
// views have widgets, make sure they both do or neither does. If
// they do, make sure the widgets are the same size.
v1 = k1->GetView();
v2 = k2->GetView();
if (((nullptr == v1) && (nullptr != v2)) ||
((nullptr != v1) && (nullptr == v2))) {
ok = false;
LogVerifyMessage(k1, k2, "child views are not matched\n");
} else if (nullptr != v1) {
if (!v1->GetBounds().IsEqualInterior(v2->GetBounds())) {
LogVerifyMessage(k1, k2, "(view rects)", v1->GetBounds(),
v2->GetBounds());
}
nsIWidget* w1 = v1->GetWidget();
nsIWidget* w2 = v2->GetWidget();
if (((nullptr == w1) && (nullptr != w2)) ||
((nullptr != w1) && (nullptr == w2))) {
ok = false;
LogVerifyMessage(k1, k2, "child widgets are not matched\n");
} else if (nullptr != w1) {
r1 = w1->GetBounds();
r2 = w2->GetBounds();
if (!r1.IsEqualEdges(r2)) {
LogVerifyMessage(k1, k2, "(widget rects)", r1.ToUnknownRect(),
r2.ToUnknownRect());
}
}
}
if (!ok && !(VerifyReflowFlags::All & gVerifyReflowFlags)) {
break;
}
// XXX Should perhaps compare their float managers.
// Compare the sub-trees too
if (!CompareTrees(aFirstPresContext, k1, aSecondPresContext, k2)) {
ok = false;
if (!(VerifyReflowFlags::All & gVerifyReflowFlags)) {
break;
}
}
} else {
break;
}
}
if (!ok && (!(VerifyReflowFlags::All & gVerifyReflowFlags))) {
break;
}
++iterLists1;
++iterLists2;
const bool lists1Done = iterLists1 == childLists1.end();
const bool lists2Done = iterLists2 == childLists2.end();
if (lists1Done != lists2Done ||
(!lists1Done && iterLists1->mID != iterLists2->mID)) {
if (!(VerifyReflowFlags::All & gVerifyReflowFlags)) {
ok = false;
}
LogVerifyMessage(kids1.FirstChild(), kids2.FirstChild(),
"child list names are not matched: ");
fprintf(stdout, "%s != %s\n",
!lists1Done ? ChildListName(iterLists1->mID) : "(null)",
!lists2Done ? ChildListName(iterLists2->mID) : "(null)");
break;
}
} while (ok && iterLists1 != childLists1.end());
return ok;
}
#endif
#if 0
static nsIFrame*
FindTopFrame(nsIFrame* aRoot)
{
if (aRoot) {
nsIContent* content = aRoot->GetContent();
if (content) {
nsAtom* tag;
content->GetTag(tag);
if (nullptr != tag) {
NS_RELEASE(tag);
return aRoot;
}
}
// Try one of the children
for (nsIFrame* kid : aRoot->PrincipalChildList()) {
nsIFrame* result = FindTopFrame(kid);
if (nullptr != result) {
return result;
}
}
}
return nullptr;
}
#endif
#ifdef DEBUG
// After an incremental reflow, we verify the correctness by doing a
// full reflow into a fresh frame tree.
bool PresShell::VerifyIncrementalReflow() {
if (VerifyReflowFlags::Noisy & gVerifyReflowFlags) {
printf("Building Verification Tree...\n");
}
// Create a presentation context to view the new frame tree
RefPtr<nsPresContext> cx = new nsRootPresContext(
mDocument, mPresContext->IsPaginated()
? nsPresContext::eContext_PrintPreview
: nsPresContext::eContext_Galley);
NS_ENSURE_TRUE(cx, false);
nsDeviceContext* dc = mPresContext->DeviceContext();
nsresult rv = cx->Init(dc);
NS_ENSURE_SUCCESS(rv, false);
// Get our scrolling preference
nsView* rootView = mViewManager->GetRootView();
NS_ENSURE_TRUE(rootView->HasWidget(), false);
nsIWidget* parentWidget = rootView->GetWidget();
// Create a new view manager.
RefPtr<nsViewManager> vm = new nsViewManager();
NS_ENSURE_TRUE(vm, false);
rv = vm->Init(dc);
NS_ENSURE_SUCCESS(rv, false);
// Create a child window of the parent that is our "root view/window"
// Create a view
nsRect tbounds = mPresContext->GetVisibleArea();
nsView* view = vm->CreateView(tbounds, nullptr);
NS_ENSURE_TRUE(view, false);
// now create the widget for the view
rv = view->CreateWidgetForParent(parentWidget, nullptr, true);
NS_ENSURE_SUCCESS(rv, false);
// Setup hierarchical relationship in view manager
vm->SetRootView(view);
// Make the new presentation context the same size as our
// presentation context.
cx->SetVisibleArea(mPresContext->GetVisibleArea());
RefPtr<PresShell> presShell = mDocument->CreatePresShell(cx, vm);
NS_ENSURE_TRUE(presShell, false);
// Note that after we create the shell, we must make sure to destroy it
presShell->SetVerifyReflowEnable(
false); // turn off verify reflow while we're
// reflowing the test frame tree
vm->SetPresShell(presShell);
{
nsAutoCauseReflowNotifier crNotifier(this);
presShell->Initialize();
}
presShell->FlushPendingNotifications(FlushType::Layout);
presShell->SetVerifyReflowEnable(
true); // turn on verify reflow again now that
// we're done reflowing the test frame tree
// Force the non-primary presshell to unsuppress; it doesn't want to normally
// because it thinks it's hidden
presShell->mPaintingSuppressed = false;
if (VerifyReflowFlags::Noisy & gVerifyReflowFlags) {
printf("Verification Tree built, comparing...\n");
}
// Now that the document has been reflowed, use its frame tree to
// compare against our frame tree.
nsIFrame* root1 = mFrameConstructor->GetRootFrame();
nsIFrame* root2 = presShell->GetRootFrame();
bool ok = CompareTrees(mPresContext, root1, cx, root2);
if (!ok && (VerifyReflowFlags::Noisy & gVerifyReflowFlags)) {
printf("Verify reflow failed, primary tree:\n");
root1->List(stdout);
printf("Verification tree:\n");
root2->List(stdout);
}
# if 0
// Sample code for dumping page to png
// XXX Needs to be made more flexible
if (!ok) {
nsString stra;
static int num = 0;
stra.AppendLiteral("C:\\mozilla\\mozilla\\debug\\filea");
stra.AppendInt(num);
stra.AppendLiteral(".png");
gfxUtils::WriteAsPNG(presShell, stra);
nsString strb;
strb.AppendLiteral("C:\\mozilla\\mozilla\\debug\\fileb");
strb.AppendInt(num);
strb.AppendLiteral(".png");
gfxUtils::WriteAsPNG(presShell, strb);
++num;
}
# endif
presShell->EndObservingDocument();
presShell->Destroy();
if (VerifyReflowFlags::Noisy & gVerifyReflowFlags) {
printf("Finished Verifying Reflow...\n");
}
return ok;
}
// Layout debugging hooks
void PresShell::ListComputedStyles(FILE* out, int32_t aIndent) {
nsIFrame* rootFrame = GetRootFrame();
if (rootFrame) {
rootFrame->Style()->List(out, aIndent);
}
// The root element's frame's ComputedStyle is the root of a separate tree.
Element* rootElement = mDocument->GetRootElement();
if (rootElement) {
nsIFrame* rootElementFrame = rootElement->GetPrimaryFrame();
if (rootElementFrame) {
rootElementFrame->Style()->List(out, aIndent);
}
}
}
#endif
#if defined(DEBUG) || defined(MOZ_LAYOUT_DEBUGGER)
void PresShell::ListStyleSheets(FILE* out, int32_t aIndent) {
auto ListStyleSheetsAtOrigin = [this, out, aIndent](StyleOrigin origin) {
int32_t sheetCount = StyleSet()->SheetCount(origin);
for (int32_t i = 0; i < sheetCount; ++i) {
StyleSet()->SheetAt(origin, i)->List(out, aIndent);
}
};
ListStyleSheetsAtOrigin(StyleOrigin::UserAgent);
ListStyleSheetsAtOrigin(StyleOrigin::User);
ListStyleSheetsAtOrigin(StyleOrigin::Author);
}
#endif
//=============================================================
//=============================================================
//-- Debug Reflow Counts
//=============================================================
//=============================================================
#ifdef MOZ_REFLOW_PERF
//-------------------------------------------------------------
void PresShell::DumpReflows() {
if (mReflowCountMgr) {
nsAutoCString uriStr;
if (mDocument) {
nsIURI* uri = mDocument->GetDocumentURI();
if (uri) {
uri->GetPathQueryRef(uriStr);
}
}
mReflowCountMgr->DisplayTotals(uriStr.get());
mReflowCountMgr->DisplayHTMLTotals(uriStr.get());
mReflowCountMgr->DisplayDiffsInTotals();
}
}
//-------------------------------------------------------------
void PresShell::CountReflows(const char* aName, nsIFrame* aFrame) {
if (mReflowCountMgr) {
mReflowCountMgr->Add(aName, aFrame);
}
}
//-------------------------------------------------------------
void PresShell::PaintCount(const char* aName, gfxContext* aRenderingContext,
nsPresContext* aPresContext, nsIFrame* aFrame,
const nsPoint& aOffset, uint32_t aColor) {
if (mReflowCountMgr) {
mReflowCountMgr->PaintCount(aName, aRenderingContext, aPresContext, aFrame,
aOffset, aColor);
}
}
//-------------------------------------------------------------
void PresShell::SetPaintFrameCount(bool aPaintFrameCounts) {
if (mReflowCountMgr) {
mReflowCountMgr->SetPaintFrameCounts(aPaintFrameCounts);
}
}
bool PresShell::IsPaintingFrameCounts() {
if (mReflowCountMgr) return mReflowCountMgr->IsPaintingFrameCounts();
return false;
}
//------------------------------------------------------------------
//-- Reflow Counter Classes Impls
//------------------------------------------------------------------
//------------------------------------------------------------------
ReflowCounter::ReflowCounter(ReflowCountMgr* aMgr) : mMgr(aMgr) {
ClearTotals();
SetTotalsCache();
}
//------------------------------------------------------------------
ReflowCounter::~ReflowCounter() = default;
//------------------------------------------------------------------
void ReflowCounter::ClearTotals() { mTotal = 0; }
//------------------------------------------------------------------
void ReflowCounter::SetTotalsCache() { mCacheTotal = mTotal; }
//------------------------------------------------------------------
void ReflowCounter::CalcDiffInTotals() { mCacheTotal = mTotal - mCacheTotal; }
//------------------------------------------------------------------
void ReflowCounter::DisplayTotals(const char* aStr) {
DisplayTotals(mTotal, aStr ? aStr : "Totals");
}
//------------------------------------------------------------------
void ReflowCounter::DisplayDiffTotals(const char* aStr) {
DisplayTotals(mCacheTotal, aStr ? aStr : "Diff Totals");
}
//------------------------------------------------------------------
void ReflowCounter::DisplayHTMLTotals(const char* aStr) {
DisplayHTMLTotals(mTotal, aStr ? aStr : "Totals");
}
//------------------------------------------------------------------
void ReflowCounter::DisplayTotals(uint32_t aTotal, const char* aTitle) {
// figure total
if (aTotal == 0) {
return;
}
ReflowCounter* gTots = (ReflowCounter*)mMgr->LookUp(kGrandTotalsStr);
printf("%25s\t", aTitle);
printf("%d\t", aTotal);
if (gTots != this && aTotal > 0) {
gTots->Add(aTotal);
}
}
//------------------------------------------------------------------
void ReflowCounter::DisplayHTMLTotals(uint32_t aTotal, const char* aTitle) {
if (aTotal == 0) {
return;
}
ReflowCounter* gTots = (ReflowCounter*)mMgr->LookUp(kGrandTotalsStr);
FILE* fd = mMgr->GetOutFile();
if (!fd) {
return;
}
fprintf(fd, "<tr><td><center>%s</center></td>", aTitle);
fprintf(fd, "<td><center>%d</center></td></tr>\n", aTotal);
if (gTots != this && aTotal > 0) {
gTots->Add(aTotal);
}
}
//------------------------------------------------------------------
//-- ReflowCountMgr
//------------------------------------------------------------------
# define KEY_BUF_SIZE_FOR_PTR \
24 // adequate char[] buffer to sprintf a pointer
ReflowCountMgr::ReflowCountMgr() : mCounts(10), mIndiFrameCounts(10) {
mCycledOnce = false;
mDumpFrameCounts = false;
mDumpFrameByFrameCounts = false;
mPaintFrameByFrameCounts = false;
}
//------------------------------------------------------------------
ReflowCountMgr::~ReflowCountMgr() = default;
//------------------------------------------------------------------
ReflowCounter* ReflowCountMgr::LookUp(const char* aName) {
return mCounts.Get(aName);
}
//------------------------------------------------------------------
void ReflowCountMgr::Add(const char* aName, nsIFrame* aFrame) {
NS_ASSERTION(aName != nullptr, "Name shouldn't be null!");
if (mDumpFrameCounts) {
auto* const counter = mCounts.GetOrInsertNew(aName, this);
counter->Add();
}
if ((mDumpFrameByFrameCounts || mPaintFrameByFrameCounts) &&
aFrame != nullptr) {
char key[KEY_BUF_SIZE_FOR_PTR];
SprintfLiteral(key, "%p", (void*)aFrame);
auto* const counter =
mIndiFrameCounts
.LookupOrInsertWith(key,
[&aName, &aFrame, this]() {
auto counter =
MakeUnique<IndiReflowCounter>(this);
counter->mFrame = aFrame;
counter->mName.AssignASCII(aName);
return counter;
})
.get();
// this eliminates extra counts from super classes
if (counter && counter->mName.EqualsASCII(aName)) {
counter->mCount++;
counter->mCounter.Add(1);
}
}
}
//------------------------------------------------------------------
void ReflowCountMgr::PaintCount(const char* aName,
gfxContext* aRenderingContext,
nsPresContext* aPresContext, nsIFrame* aFrame,
const nsPoint& aOffset, uint32_t aColor) {
if (mPaintFrameByFrameCounts && aFrame != nullptr) {
char key[KEY_BUF_SIZE_FOR_PTR];
SprintfLiteral(key, "%p", (void*)aFrame);
IndiReflowCounter* counter = mIndiFrameCounts.Get(key);
if (counter != nullptr && counter->mName.EqualsASCII(aName)) {
DrawTarget* drawTarget = aRenderingContext->GetDrawTarget();
int32_t appUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel();
aRenderingContext->Save();
gfxPoint devPixelOffset =
nsLayoutUtils::PointToGfxPoint(aOffset, appUnitsPerDevPixel);
aRenderingContext->SetMatrixDouble(
aRenderingContext->CurrentMatrixDouble().PreTranslate(
devPixelOffset));
// We don't care about the document language or user fonts here;
// just get a default Latin font.
nsFont font(StyleGenericFontFamily::Serif, Length::FromPixels(11));
nsFontMetrics::Params params;
params.language = nsGkAtoms::x_western;
params.textPerf = aPresContext->GetTextPerfMetrics();
params.featureValueLookup = aPresContext->GetFontFeatureValuesLookup();
RefPtr<nsFontMetrics> fm = aPresContext->GetMetricsFor(font, params);
char buf[16];
int len = SprintfLiteral(buf, "%d", counter->mCount);
nscoord x = 0, y = fm->MaxAscent();
nscoord width, height = fm->MaxHeight();
fm->SetTextRunRTL(false);
width = fm->GetWidth(buf, len, drawTarget);
sRGBColor color;
sRGBColor color2;
if (aColor != 0) {
color = sRGBColor::FromABGR(aColor);
color2 = sRGBColor(0.f, 0.f, 0.f);
} else {
gfx::Float rc = 0.f, gc = 0.f, bc = 0.f;
if (counter->mCount < 5) {
rc = 1.f;
gc = 1.f;
} else if (counter->mCount < 11) {
gc = 1.f;
} else {
rc = 1.f;
}
color = sRGBColor(rc, gc, bc);
color2 = sRGBColor(rc / 2, gc / 2, bc / 2);
}
nsRect rect(0, 0, width + 15, height + 15);
Rect devPxRect =
NSRectToSnappedRect(rect, appUnitsPerDevPixel, *drawTarget);
ColorPattern black(ToDeviceColor(sRGBColor::OpaqueBlack()));
drawTarget->FillRect(devPxRect, black);
aRenderingContext->SetColor(color2);
fm->DrawString(buf, len, x + 15, y + 15, aRenderingContext);
aRenderingContext->SetColor(color);
fm->DrawString(buf, len, x, y, aRenderingContext);
aRenderingContext->Restore();
}
}
}
//------------------------------------------------------------------
void ReflowCountMgr::DoGrandTotals() {
mCounts.WithEntryHandle(kGrandTotalsStr, [this](auto&& entry) {
if (!entry) {
entry.Insert(MakeUnique<ReflowCounter>(this));
} else {
entry.Data()->ClearTotals();
}
});
printf("\t\t\t\tTotal\n");
for (uint32_t i = 0; i < 78; i++) {
printf("-");
}
printf("\n");
for (const auto& entry : mCounts) {
entry.GetData()->DisplayTotals(entry.GetKey());
}
}
static void RecurseIndiTotals(
nsPresContext* aPresContext,
nsClassHashtable<nsCharPtrHashKey, IndiReflowCounter>& aHT,
nsIFrame* aParentFrame, int32_t aLevel) {
if (aParentFrame == nullptr) {
return;
}
char key[KEY_BUF_SIZE_FOR_PTR];
SprintfLiteral(key, "%p", (void*)aParentFrame);
IndiReflowCounter* counter = aHT.Get(key);
if (counter) {
counter->mHasBeenOutput = true;
char* name = ToNewCString(counter->mName);
for (int32_t i = 0; i < aLevel; i++) printf(" ");
printf("%s - %p [%d][", name, (void*)aParentFrame, counter->mCount);
printf("%d", counter->mCounter.GetTotal());
printf("]\n");
free(name);
}
for (nsIFrame* child : aParentFrame->PrincipalChildList()) {
RecurseIndiTotals(aPresContext, aHT, child, aLevel + 1);
}
}
//------------------------------------------------------------------
void ReflowCountMgr::DoIndiTotalsTree() {
printf("\n------------------------------------------------\n");
printf("-- Individual Frame Counts\n");
printf("------------------------------------------------\n");
if (mPresShell) {
nsIFrame* rootFrame = mPresShell->GetRootFrame();
RecurseIndiTotals(mPresContext, mIndiFrameCounts, rootFrame, 0);
printf("------------------------------------------------\n");
printf("-- Individual Counts of Frames not in Root Tree\n");
printf("------------------------------------------------\n");
for (const auto& counter : mIndiFrameCounts.Values()) {
if (!counter->mHasBeenOutput) {
char* name = ToNewCString(counter->mName);
printf("%s - %p [%d][", name, (void*)counter->mFrame,
counter->mCount);
printf("%d", counter->mCounter.GetTotal());
printf("]\n");
free(name);
}
}
}
}
//------------------------------------------------------------------
void ReflowCountMgr::DoGrandHTMLTotals() {
mCounts.WithEntryHandle(kGrandTotalsStr, [this](auto&& entry) {
if (!entry) {
entry.Insert(MakeUnique<ReflowCounter>(this));
} else {
entry.Data()->ClearTotals();
}
});
static const char* title[] = {"Class", "Reflows"};
fprintf(mFD, "<tr>");
for (uint32_t i = 0; i < ArrayLength(title); i++) {
fprintf(mFD, "<td><center><b>%s<b></center></td>", title[i]);
}
fprintf(mFD, "</tr>\n");
for (const auto& entry : mCounts) {
entry.GetData()->DisplayHTMLTotals(entry.GetKey());
}
}
//------------------------------------
void ReflowCountMgr::DisplayTotals(const char* aStr) {
# ifdef DEBUG_rods
printf("%s\n", aStr ? aStr : "No name");
# endif
if (mDumpFrameCounts) {
DoGrandTotals();
}
if (mDumpFrameByFrameCounts) {
DoIndiTotalsTree();
}
}
//------------------------------------
void ReflowCountMgr::DisplayHTMLTotals(const char* aStr) {
# ifdef WIN32x // XXX NOT XP!
char name[1024];
char* sptr = strrchr(aStr, '/');
if (sptr) {
sptr++;
strcpy(name, sptr);
char* eptr = strrchr(name, '.');
if (eptr) {
*eptr = 0;
}
strcat(name, "_stats.html");
}
mFD = fopen(name, "w");
if (mFD) {
fprintf(mFD, "<html><head><title>Reflow Stats</title></head><body>\n");
const char* title = aStr ? aStr : "No name";
fprintf(mFD,
"<center><b>%s</b><br><table border=1 "
"style=\"background-color:#e0e0e0\">",
title);
DoGrandHTMLTotals();
fprintf(mFD, "</center></table>\n");
fprintf(mFD, "</body></html>\n");
fclose(mFD);
mFD = nullptr;
}
# endif // not XP!
}
//------------------------------------------------------------------
void ReflowCountMgr::ClearTotals() {
for (const auto& data : mCounts.Values()) {
data->ClearTotals();
}
}
//------------------------------------------------------------------
void ReflowCountMgr::ClearGrandTotals() {
mCounts.WithEntryHandle(kGrandTotalsStr, [&](auto&& entry) {
if (!entry) {
entry.Insert(MakeUnique<ReflowCounter>(this));
} else {
entry.Data()->ClearTotals();
entry.Data()->SetTotalsCache();
}
});
}
//------------------------------------------------------------------
void ReflowCountMgr::DisplayDiffsInTotals() {
if (mCycledOnce) {
printf("Differences\n");
for (int32_t i = 0; i < 78; i++) {
printf("-");
}
printf("\n");
ClearGrandTotals();
}
for (const auto& entry : mCounts) {
if (mCycledOnce) {
entry.GetData()->CalcDiffInTotals();
entry.GetData()->DisplayDiffTotals(entry.GetKey());
}
entry.GetData()->SetTotalsCache();
}
mCycledOnce = true;
}
#endif // MOZ_REFLOW_PERF
nsIFrame* PresShell::GetAbsoluteContainingBlock(nsIFrame* aFrame) {
return FrameConstructor()->GetAbsoluteContainingBlock(
aFrame, nsCSSFrameConstructor::ABS_POS);
}
void PresShell::ActivenessMaybeChanged() {
if (!mDocument) {
return;
}
SetIsActive(ComputeActiveness());
}
// A PresShell being active means that it is visible (or close to be visible, if
// the front-end is warming it). That means that when it is active we always
// tick its refresh driver at full speed if needed.
//
// Image documents behave specially in the sense that they are always "active"
// and never "in the active tab". However these documents tick manually so
// there's not much to worry about there.
bool PresShell::ComputeActiveness() const {
MOZ_LOG(gLog, LogLevel::Debug,
("PresShell::ComputeActiveness(%s, %d)\n",
mDocument->GetDocumentURI()
? mDocument->GetDocumentURI()->GetSpecOrDefault().get()
: "(no uri)",
mIsActive));
Document* doc = mDocument;
if (doc->IsBeingUsedAsImage()) {
// Documents used as an image can remain active. They do not tick their
// refresh driver if not painted, and they can't run script or such so they
// can't really observe much else.
//
// Image docs can be displayed in multiple docs at the same time so the "in
// active tab" bool doesn't make much sense for them.
return true;
}
if (Document* displayDoc = doc->GetDisplayDocument()) {
// Ok, we're an external resource document -- we need to use our display
// document's docshell to determine "IsActive" status, since we lack
// a browsing context of our own.
MOZ_ASSERT(!doc->GetBrowsingContext(),
"external resource doc shouldn't have its own BC");
doc = displayDoc;
}
BrowsingContext* bc = doc->GetBrowsingContext();
const bool inActiveTab = bc && bc->IsActive();
MOZ_LOG(gLog, LogLevel::Debug,
(" > BrowsingContext %p active: %d", bc, inActiveTab));
Document* root = nsContentUtils::GetInProcessSubtreeRootDocument(doc);
if (auto* browserChild = BrowserChild::GetFrom(root->GetDocShell())) {
// We might want to activate a tab even though the browsing-context is not
// active if the BrowserChild is considered visible. This serves two
// purposes:
//
// * For top-level tabs, we use this for tab warming. The browsing-context
// might still be inactive, but we want to activate the pres shell and
// the refresh driver.
//
// * For oop iframes, we do want to throttle them if they're not visible.
//
// TODO(emilio): Consider unifying the in-process vs. fission iframe
// throttling code (in-process throttling for non-visible iframes lives
// right now in Document::ShouldThrottleFrameRequests(), but that only
// throttles rAF).
if (!browserChild->IsVisible()) {
MOZ_LOG(gLog, LogLevel::Debug,
(" > BrowserChild %p is not visible", browserChild));
return false;
}
// If the browser is visible but just due to be preserving layers
// artificially, we do want to fall back to the browsing context activeness
// instead. Otherwise we do want to be active for the use cases above.
if (!browserChild->IsPreservingLayers()) {
MOZ_LOG(gLog, LogLevel::Debug,
(" > BrowserChild %p is visible and not preserving layers",
browserChild));
return true;
}
MOZ_LOG(
gLog, LogLevel::Debug,
(" > BrowserChild %p is visible and preserving layers", browserChild));
}
return inActiveTab;
}
void PresShell::SetIsActive(bool aIsActive) {
MOZ_ASSERT(mDocument, "should only be called with a document");
const bool activityChanged = mIsActive != aIsActive;
mIsActive = aIsActive;
nsPresContext* presContext = GetPresContext();
if (presContext &&
presContext->RefreshDriver()->GetPresContext() == presContext) {
presContext->RefreshDriver()->SetActivity(aIsActive);
}
if (activityChanged) {
// Propagate state-change to my resource documents' PresShells and other
// subdocuments.
//
// Note that it is fine to not propagate to fission iframes. Those will
// become active / inactive as needed as a result of they getting painted /
// not painted eventually.
auto recurse = [aIsActive](Document& aSubDoc) {
if (PresShell* presShell = aSubDoc.GetPresShell()) {
presShell->SetIsActive(aIsActive);
}
return CallState::Continue;
};
mDocument->EnumerateExternalResources(recurse);
mDocument->EnumerateSubDocuments(recurse);
}
UpdateImageLockingState();
if (activityChanged) {
#if defined(MOZ_WIDGET_ANDROID)
if (!aIsActive && presContext &&
presContext->IsRootContentDocumentCrossProcess()) {
// Reset the dynamic toolbar offset state.
presContext->UpdateDynamicToolbarOffset(0);
}
#endif
}
if (aIsActive) {
#ifdef ACCESSIBILITY
if (nsAccessibilityService* accService = GetAccService()) {
accService->PresShellActivated(this);
}
#endif
if (nsIFrame* rootFrame = GetRootFrame()) {
rootFrame->SchedulePaint();
}
}
}
RefPtr<MobileViewportManager> PresShell::GetMobileViewportManager() const {
return mMobileViewportManager;
}
Maybe<MobileViewportManager::ManagerType> UseMobileViewportManager(
PresShell* aPresShell, Document* aDocument) {
// If we're not using APZ, we won't be able to zoom, so there is no
// point in having an MVM.
if (nsPresContext* presContext = aPresShell->GetPresContext()) {
if (nsIWidget* widget = presContext->GetNearestWidget()) {
if (!widget->AsyncPanZoomEnabled()) {
return Nothing();
}
}
}
if (nsLayoutUtils::ShouldHandleMetaViewport(aDocument)) {
return Some(MobileViewportManager::ManagerType::VisualAndMetaViewport);
}
if (nsLayoutUtils::AllowZoomingForDocument(aDocument)) {
return Some(MobileViewportManager::ManagerType::VisualViewportOnly);
}
return Nothing();
}
void PresShell::MaybeRecreateMobileViewportManager(bool aAfterInitialization) {
// Determine if we require a MobileViewportManager, and what kind if so. We
// need one any time we allow resolution zooming for a document, and any time
// we want to obey <meta name="viewport"> tags for it.
Maybe<MobileViewportManager::ManagerType> mvmType =
UseMobileViewportManager(this, mDocument);
if (mvmType.isNothing() && !mMobileViewportManager) {
// We don't need one and don't have it. So we're done.
return;
}
if (mvmType && mMobileViewportManager &&
*mvmType == mMobileViewportManager->GetManagerType()) {
// We need one and we have one of the correct type, so we're done.
return;
}
if (!mPresContext->IsRootContentDocumentCrossProcess()) {
MOZ_ASSERT(!mMobileViewportManager, "We never create MVMs for subframes");
return;
}
if (mMobileViewportManager) {
// We have one, but we need to either destroy it completely to replace it
// with another one of the correct type. So either way, let's destroy the
// one we have.
mMobileViewportManager->Destroy();
mMobileViewportManager = nullptr;
mMVMContext = nullptr;
ResetVisualViewportSize();
}
if (mvmType) {
// Let's create the MVM of the type that we need. At this point we shouldn't
// have one.
MOZ_ASSERT(!mMobileViewportManager);
mMVMContext = new GeckoMVMContext(mDocument, this);
mMobileViewportManager = new MobileViewportManager(mMVMContext, *mvmType);
if (MOZ_UNLIKELY(
MOZ_LOG_TEST(MobileViewportManager::gLog, LogLevel::Debug))) {
nsIURI* uri = mDocument->GetDocumentURI();
MOZ_LOG(
MobileViewportManager::gLog, LogLevel::Debug,
("Created MVM %p (type %d) for URI %s", mMobileViewportManager.get(),
(int)*mvmType, uri ? uri->GetSpecOrDefault().get() : "(null)"));
}
}
if (aAfterInitialization) {
// Setting the initial viewport will trigger a reflow.
if (mMobileViewportManager) {
mMobileViewportManager->SetInitialViewport();
} else {
// Force a reflow to our correct view manager size.
ForceResizeReflowWithCurrentDimensions();
}
// After we clear out the MVM and the MVMContext, also reset the
// resolution to 1.
SetResolutionAndScaleTo(1.0f, ResolutionChangeOrigin::MainThreadRestore);
}
}
bool PresShell::UsesMobileViewportSizing() const {
return mMobileViewportManager &&
nsLayoutUtils::ShouldHandleMetaViewport(mDocument);
}
/*
* Determines the current image locking state. Called when one of the
* dependent factors changes.
*/
void PresShell::UpdateImageLockingState() {
// We're locked if we're both thawed and active.
const bool locked = !mFrozen && mIsActive;
auto* tracker = mDocument->ImageTracker();
if (locked == tracker->GetLockingState()) {
return;
}
tracker->SetLockingState(locked);
if (locked) {
// Request decodes for visible image frames; we want to start decoding as
// quickly as possible when we get foregrounded to minimize flashing.
for (const auto& key : mApproximatelyVisibleFrames) {
if (nsImageFrame* imageFrame = do_QueryFrame(key)) {
imageFrame->MaybeDecodeForPredictedSize();
}
}
}
}
PresShell* PresShell::GetRootPresShell() const {
if (mPresContext) {
nsPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext) {
return rootPresContext->PresShell();
}
}
return nullptr;
}
void PresShell::AddSizeOfIncludingThis(nsWindowSizes& aSizes) const {
MallocSizeOf mallocSizeOf = aSizes.mState.mMallocSizeOf;
mFrameArena.AddSizeOfExcludingThis(aSizes, Arena::ArenaKind::PresShell);
aSizes.mLayoutPresShellSize += mallocSizeOf(this);
if (mCaret) {
aSizes.mLayoutPresShellSize += mCaret->SizeOfIncludingThis(mallocSizeOf);
}
aSizes.mLayoutPresShellSize +=
mApproximatelyVisibleFrames.ShallowSizeOfExcludingThis(mallocSizeOf) +
mFramesToDirty.ShallowSizeOfExcludingThis(mallocSizeOf) +
mPendingScrollAnchorSelection.ShallowSizeOfExcludingThis(mallocSizeOf) +
mPendingScrollAnchorAdjustment.ShallowSizeOfExcludingThis(mallocSizeOf);
aSizes.mLayoutTextRunsSize += SizeOfTextRuns(mallocSizeOf);
aSizes.mLayoutPresContextSize +=
mPresContext->SizeOfIncludingThis(mallocSizeOf);
mFrameConstructor->AddSizeOfIncludingThis(aSizes);
}
size_t PresShell::SizeOfTextRuns(MallocSizeOf aMallocSizeOf) const {
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) {
return 0;
}
// clear the TEXT_RUN_MEMORY_ACCOUNTED flags
nsLayoutUtils::SizeOfTextRunsForFrames(rootFrame, nullptr,
/* clear = */ true);
// collect the total memory in use for textruns
return nsLayoutUtils::SizeOfTextRunsForFrames(rootFrame, aMallocSizeOf,
/* clear = */ false);
}
void PresShell::MarkFixedFramesForReflow(IntrinsicDirty aIntrinsicDirty) {
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
const nsFrameList& childList =
rootFrame->GetChildList(FrameChildListID::Fixed);
for (nsIFrame* childFrame : childList) {
FrameNeedsReflow(childFrame, aIntrinsicDirty, NS_FRAME_IS_DIRTY);
}
}
}
static void AppendSubtree(nsIDocShell* aDocShell,
nsTArray<nsCOMPtr<nsIDocumentViewer>>& aArray) {
if (nsCOMPtr<nsIDocumentViewer> viewer = aDocShell->GetDocViewer()) {
aArray.AppendElement(viewer);
}
int32_t n = aDocShell->GetInProcessChildCount();
for (int32_t i = 0; i < n; i++) {
nsCOMPtr<nsIDocShellTreeItem> childItem;
aDocShell->GetInProcessChildAt(i, getter_AddRefs(childItem));
if (childItem) {
nsCOMPtr<nsIDocShell> child(do_QueryInterface(childItem));
AppendSubtree(child, aArray);
}
}
}
void PresShell::MaybeReflowForInflationScreenSizeChange() {
nsPresContext* pc = GetPresContext();
const bool fontInflationWasEnabled = FontSizeInflationEnabled();
RecomputeFontSizeInflationEnabled();
bool changed = false;
if (FontSizeInflationEnabled() && FontSizeInflationMinTwips() != 0) {
pc->ScreenSizeInchesForFontInflation(&changed);
}
changed = changed || fontInflationWasEnabled != FontSizeInflationEnabled();
if (!changed) {
return;
}
if (nsCOMPtr<nsIDocShell> docShell = pc->GetDocShell()) {
nsTArray<nsCOMPtr<nsIDocumentViewer>> array;
AppendSubtree(docShell, array);
for (uint32_t i = 0, iEnd = array.Length(); i < iEnd; ++i) {
nsCOMPtr<nsIDocumentViewer> viewer = array[i];
if (RefPtr<PresShell> descendantPresShell = viewer->GetPresShell()) {
nsIFrame* rootFrame = descendantPresShell->GetRootFrame();
if (rootFrame) {
descendantPresShell->FrameNeedsReflow(
rootFrame, IntrinsicDirty::FrameAncestorsAndDescendants,
NS_FRAME_IS_DIRTY);
}
}
}
}
}
void PresShell::CompleteChangeToVisualViewportSize() {
// This can get called during reflow, if the caller wants to get the latest
// visual viewport size after scrollbars have been added/removed. In such a
// case, we don't need to mark things as dirty because the things that we
// would mark dirty either just got updated (the root scrollframe's
// scrollbars), or will be laid out later during this reflow cycle (fixed-pos
// items). Callers that update the visual viewport during a reflow are
// responsible for maintaining these invariants.
if (!mIsReflowing) {
if (nsIScrollableFrame* rootScrollFrame =
GetRootScrollFrameAsScrollable()) {
rootScrollFrame->MarkScrollbarsDirtyForReflow();
}
MarkFixedFramesForReflow(IntrinsicDirty::None);
}
MaybeReflowForInflationScreenSizeChange();
if (auto* window = nsGlobalWindowInner::Cast(mDocument->GetInnerWindow())) {
window->VisualViewport()->PostResizeEvent();
}
}
void PresShell::SetVisualViewportSize(nscoord aWidth, nscoord aHeight) {
MOZ_ASSERT(aWidth >= 0.0 && aHeight >= 0.0);
if (!mVisualViewportSizeSet || mVisualViewportSize.width != aWidth ||
mVisualViewportSize.height != aHeight) {
mVisualViewportSizeSet = true;
mVisualViewportSize.width = aWidth;
mVisualViewportSize.height = aHeight;
CompleteChangeToVisualViewportSize();
}
}
void PresShell::ResetVisualViewportSize() {
if (mVisualViewportSizeSet) {
mVisualViewportSizeSet = false;
mVisualViewportSize.width = 0;
mVisualViewportSize.height = 0;
CompleteChangeToVisualViewportSize();
}
}
bool PresShell::SetVisualViewportOffset(const nsPoint& aScrollOffset,
const nsPoint& aPrevLayoutScrollPos) {
nsPoint newOffset = aScrollOffset;
nsIScrollableFrame* rootScrollFrame = GetRootScrollFrameAsScrollable();
if (rootScrollFrame) {
// See the comment in nsHTMLScrollFrame::Reflow above the call to
// SetVisualViewportOffset for why we need to do this.
nsRect scrollRange = rootScrollFrame->GetScrollRangeForUserInputEvents();
if (!scrollRange.Contains(newOffset)) {
newOffset.x = std::min(newOffset.x, scrollRange.XMost());
newOffset.x = std::max(newOffset.x, scrollRange.x);
newOffset.y = std::min(newOffset.y, scrollRange.YMost());
newOffset.y = std::max(newOffset.y, scrollRange.y);
}
}
// Careful here not to call GetVisualViewportOffset to get the previous visual
// viewport offset because if mVisualViewportOffset is nothing then we'll get
// the layout scroll position directly from the scroll frame and it has likely
// already been updated.
nsPoint prevOffset = aPrevLayoutScrollPos;
if (mVisualViewportOffset.isSome()) {
prevOffset = *mVisualViewportOffset;
}
if (prevOffset == newOffset) {
return false;
}
mVisualViewportOffset = Some(newOffset);
if (auto* window = nsGlobalWindowInner::Cast(mDocument->GetInnerWindow())) {
window->VisualViewport()->PostScrollEvent(prevOffset, aPrevLayoutScrollPos);
}
if (IsVisualViewportSizeSet() && rootScrollFrame) {
rootScrollFrame->Anchor()->UserScrolled();
}
if (gfxPlatform::UseDesktopZoomingScrollbars()) {
if (nsIScrollableFrame* rootScrollFrame =
GetRootScrollFrameAsScrollable()) {
rootScrollFrame->UpdateScrollbarPosition();
}
}
return true;
}
void PresShell::ResetVisualViewportOffset() { mVisualViewportOffset.reset(); }
void PresShell::ScrollToVisual(const nsPoint& aVisualViewportOffset,
FrameMetrics::ScrollOffsetUpdateType aUpdateType,
ScrollMode aMode) {
MOZ_ASSERT(aMode == ScrollMode::Instant || aMode == ScrollMode::SmoothMsd);
if (aMode == ScrollMode::SmoothMsd) {
if (nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable()) {
if (sf->SmoothScrollVisual(aVisualViewportOffset, aUpdateType)) {
return;
}
}
}
// If the caller asked for instant scroll, or if we failed
// to do a smooth scroll, do an instant scroll.
SetPendingVisualScrollUpdate(aVisualViewportOffset, aUpdateType);
}
void PresShell::SetPendingVisualScrollUpdate(
const nsPoint& aVisualViewportOffset,
FrameMetrics::ScrollOffsetUpdateType aUpdateType) {
mPendingVisualScrollUpdate =
Some(VisualScrollUpdate{aVisualViewportOffset, aUpdateType});
// The pending update is picked up during the next paint.
// Schedule a paint to make sure one will happen.
if (nsIFrame* rootFrame = GetRootFrame()) {
rootFrame->SchedulePaint();
}
}
void PresShell::ClearPendingVisualScrollUpdate() {
if (mPendingVisualScrollUpdate && mPendingVisualScrollUpdate->mAcknowledged) {
mPendingVisualScrollUpdate = mozilla::Nothing();
}
}
void PresShell::AcknowledgePendingVisualScrollUpdate() {
MOZ_ASSERT(mPendingVisualScrollUpdate);
mPendingVisualScrollUpdate->mAcknowledged = true;
}
nsPoint PresShell::GetVisualViewportOffsetRelativeToLayoutViewport() const {
return GetVisualViewportOffset() - GetLayoutViewportOffset();
}
nsPoint PresShell::GetLayoutViewportOffset() const {
nsPoint result;
if (nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable()) {
result = sf->GetScrollPosition();
}
return result;
}
nsSize PresShell::GetLayoutViewportSize() const {
nsSize result;
if (nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable()) {
result = sf->GetScrollPortRect().Size();
}
return result;
}
nsSize PresShell::GetVisualViewportSizeUpdatedByDynamicToolbar() const {
NS_ASSERTION(mVisualViewportSizeSet,
"asking for visual viewport size when its not set?");
if (!mMobileViewportManager) {
return mVisualViewportSize;
}
MOZ_ASSERT(GetDynamicToolbarState() == DynamicToolbarState::InTransition ||
GetDynamicToolbarState() == DynamicToolbarState::Collapsed);
nsSize sizeUpdatedByDynamicToolbar =
mMobileViewportManager->GetVisualViewportSizeUpdatedByDynamicToolbar();
return sizeUpdatedByDynamicToolbar == nsSize() ? mVisualViewportSize
: sizeUpdatedByDynamicToolbar;
}
void PresShell::RecomputeFontSizeInflationEnabled() {
mFontSizeInflationEnabled = DetermineFontSizeInflationState();
}
bool PresShell::DetermineFontSizeInflationState() {
MOZ_ASSERT(mPresContext, "our pres context should not be null");
if (mPresContext->IsChrome()) {
return false;
}
if (FontSizeInflationEmPerLine() == 0 && FontSizeInflationMinTwips() == 0) {
return false;
}
// Force-enabling font inflation always trumps the heuristics here.
if (!FontSizeInflationForceEnabled()) {
if (BrowserChild* tab = BrowserChild::GetFrom(this)) {
// We're in a child process. Cancel inflation if we're not
// async-pan zoomed.
if (!tab->AsyncPanZoomEnabled()) {
return false;
}
} else if (XRE_IsParentProcess()) {
// We're in the master process. Cancel inflation if it's been
// explicitly disabled.
if (FontSizeInflationDisabledInMasterProcess()) {
return false;
}
}
}
Maybe<LayoutDeviceIntSize> displaySize;
// The MVM already caches the top-level content viewer size and is therefore
// the fastest way of getting that data.
if (mPresContext->IsRootContentDocumentCrossProcess()) {
if (mMobileViewportManager) {
displaySize = Some(mMobileViewportManager->DisplaySize());
}
} else if (PresShell* rootPresShell = GetRootPresShell()) {
// With any luck, we can get at the root content document without any cross-
// process shenanigans.
if (auto mvm = rootPresShell->GetMobileViewportManager()) {
displaySize = Some(mvm->DisplaySize());
}
}
if (!displaySize) {
// Unfortunately, it looks like the root content document lives in a
// different process. For consistency's sake it would be best to always use
// the content viewer size of the root content document, but it's not worth
// the effort, because this only makes a difference in the case of pages
// with an explicitly sized viewport (neither "width=device-width" nor a
// completely missing viewport tag) being loaded within a frame, which is
// hopefully a relatively exotic case.
// More to the point, these viewport size and zoom-based calculations don't
// really make sense for frames anyway, so instead of creating a way to
// access the content viewer size of the top level document cross-process,
// we probably rather want frames to simply inherit the font inflation state
// of their top-level parent and should therefore invest any time spent on
// getting things to work cross-process into that (bug 1724311).
// Until we get around to that though, we just use the content viewer size
// of however high we can get within the same process.
// (This also serves as a fallback code path if the MVM isn't available,
// e.g. when debugging in non-e10s mode on Desktop.)
nsPresContext* topContext =
mPresContext->GetInProcessRootContentDocumentPresContext();
LayoutDeviceIntSize result;
if (!nsLayoutUtils::GetDocumentViewerSize(topContext, result)) {
return false;
}
displaySize = Some(result);
}
ScreenIntSize screenSize = ViewAs<ScreenPixel>(
displaySize.value(),
PixelCastJustification::LayoutDeviceIsScreenForBounds);
nsViewportInfo vInf = GetDocument()->GetViewportInfo(screenSize);
CSSToScreenScale defaultScale =
mPresContext->CSSToDevPixelScale() * LayoutDeviceToScreenScale(1.0);
if (vInf.GetDefaultZoom() >= defaultScale || vInf.IsAutoSizeEnabled()) {
return false;
}
return true;
}
static nsIWidget* GetPresContextContainerWidget(nsPresContext* aPresContext) {
nsCOMPtr<nsISupports> container = aPresContext->Document()->GetContainer();
nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(container);
if (!baseWindow) {
return nullptr;
}
nsCOMPtr<nsIWidget> mainWidget;
baseWindow->GetMainWidget(getter_AddRefs(mainWidget));
return mainWidget;
}
static bool IsTopLevelWidget(nsIWidget* aWidget) {
using WindowType = mozilla::widget::WindowType;
auto windowType = aWidget->GetWindowType();
return windowType == WindowType::TopLevel ||
windowType == WindowType::Dialog || windowType == WindowType::Popup;
}
PresShell::WindowSizeConstraints PresShell::GetWindowSizeConstraints() {
nsSize minSize(0, 0);
nsSize maxSize(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
nsIFrame* rootFrame = FrameConstructor()->GetRootElementStyleFrame();
if (!rootFrame || !mPresContext) {
return {minSize, maxSize};
}
const auto* pos = rootFrame->StylePosition();
if (pos->mMinWidth.ConvertsToLength()) {
minSize.width = pos->mMinWidth.ToLength();
}
if (pos->mMinHeight.ConvertsToLength()) {
minSize.height = pos->mMinHeight.ToLength();
}
if (pos->mMaxWidth.ConvertsToLength()) {
maxSize.width = pos->mMaxWidth.ToLength();
}
if (pos->mMaxHeight.ConvertsToLength()) {
maxSize.height = pos->mMaxHeight.ToLength();
}
return {minSize, maxSize};
}
void PresShell::SyncWindowProperties(bool aSync) {
nsView* view = mViewManager->GetRootView();
if (!view || !view->HasWidget()) {
return;
}
RefPtr pc = mPresContext;
if (!pc) {
return;
}
nsCOMPtr<nsIWidget> windowWidget = GetPresContextContainerWidget(pc);
if (!windowWidget || !IsTopLevelWidget(windowWidget)) {
return;
}
nsIFrame* rootFrame = FrameConstructor()->GetRootElementStyleFrame();
if (!rootFrame) {
return;
}
if (!aSync) {
view->SetNeedsWindowPropertiesSync();
return;
}
AutoWeakFrame weak(rootFrame);
if (!GetRootScrollFrame()) {
// Scrollframes use native widgets which don't work well with
// translucent windows, at least in Windows XP. So if the document
// has a root scrollrame it's useless to try to make it transparent,
// we'll just get something broken.
// We can change this to allow translucent toplevel HTML documents
// (e.g. to do something like Dashboard widgets), once we
// have broad support for translucent scrolled documents, but be
// careful because apparently some Firefox extensions expect
// openDialog("something.html") to produce an opaque window
// even if the HTML doesn't have a background-color set.
auto* canvas = GetCanvasFrame();
widget::TransparencyMode mode = nsLayoutUtils::GetFrameTransparency(
canvas ? canvas : rootFrame, rootFrame);
windowWidget->SetTransparencyMode(mode);
// For macOS, apply color scheme to the top level window widget.
windowWidget->SetColorScheme(
Some(LookAndFeel::ColorSchemeForFrame(rootFrame)));
}
if (!weak.IsAlive()) {
return;
}
const auto& constraints = GetWindowSizeConstraints();
nsContainerFrame::SetSizeConstraints(pc, windowWidget, constraints.mMinSize,
constraints.mMaxSize);
}
nsresult PresShell::HasRuleProcessorUsedByMultipleStyleSets(uint32_t aSheetType,
bool* aRetVal) {
*aRetVal = false;
return NS_OK;
}
void PresShell::NotifyStyleSheetServiceSheetAdded(StyleSheet* aSheet,
uint32_t aSheetType) {
switch (aSheetType) {
case nsIStyleSheetService::AGENT_SHEET:
AddAgentSheet(aSheet);
break;
case nsIStyleSheetService::USER_SHEET:
AddUserSheet(aSheet);
break;
case nsIStyleSheetService::AUTHOR_SHEET:
AddAuthorSheet(aSheet);
break;
default:
MOZ_ASSERT_UNREACHABLE("unexpected aSheetType value");
break;
}
}
void PresShell::NotifyStyleSheetServiceSheetRemoved(StyleSheet* aSheet,
uint32_t aSheetType) {
StyleSet()->RemoveStyleSheet(*aSheet);
mDocument->ApplicableStylesChanged();
}
nsIContent* PresShell::EventHandler::GetOverrideClickTarget(
WidgetGUIEvent* aGUIEvent, nsIFrame* aFrame) {
if (aGUIEvent->mMessage != eMouseUp) {
return nullptr;
}
MOZ_ASSERT(aGUIEvent->mClass == eMouseEventClass);
WidgetMouseEvent* mouseEvent = aGUIEvent->AsMouseEvent();
uint32_t flags = 0;
RelativeTo relativeTo{aFrame};
nsPoint eventPoint =
nsLayoutUtils::GetEventCoordinatesRelativeTo(aGUIEvent, relativeTo);
if (mouseEvent->mIgnoreRootScrollFrame) {
flags |= INPUT_IGNORE_ROOT_SCROLL_FRAME;
}
nsIFrame* target =
FindFrameTargetedByInputEvent(aGUIEvent, relativeTo, eventPoint, flags);
if (!target) {
return nullptr;
}
nsIContent* overrideClickTarget = target->GetContent();
while (overrideClickTarget && !overrideClickTarget->IsElement()) {
overrideClickTarget = overrideClickTarget->GetFlattenedTreeParent();
}
return overrideClickTarget;
}
/******************************************************************************
* PresShell::EventHandler::EventTargetData
******************************************************************************/
void PresShell::EventHandler::EventTargetData::SetFrameAndComputePresShell(
nsIFrame* aFrameToHandleEvent) {
if (aFrameToHandleEvent) {
mFrame = aFrameToHandleEvent;
mPresShell = aFrameToHandleEvent->PresShell();
} else {
mFrame = nullptr;
mPresShell = nullptr;
}
}
void PresShell::EventHandler::EventTargetData::
SetFrameAndComputePresShellAndContent(nsIFrame* aFrameToHandleEvent,
WidgetGUIEvent* aGUIEvent) {
MOZ_ASSERT(aFrameToHandleEvent);
MOZ_ASSERT(aGUIEvent);
SetFrameAndComputePresShell(aFrameToHandleEvent);
SetContentForEventFromFrame(aGUIEvent);
}
void PresShell::EventHandler::EventTargetData::SetContentForEventFromFrame(
WidgetGUIEvent* aGUIEvent) {
MOZ_ASSERT(mFrame);
mContent = nullptr;
mFrame->GetContentForEvent(aGUIEvent, getter_AddRefs(mContent));
AssertIfEventTargetContentAndFrameContentMismatch(aGUIEvent);
}
nsIContent* PresShell::EventHandler::EventTargetData::GetFrameContent() const {
return mFrame ? mFrame->GetContent() : nullptr;
}
void PresShell::EventHandler::EventTargetData::
AssertIfEventTargetContentAndFrameContentMismatch(
const WidgetGUIEvent* aGUIEvent) const {
#ifdef DEBUG
if (!mContent || !mFrame || !mFrame->GetContent()) {
return;
}
// If we know the event, we can compute the target correctly.
if (aGUIEvent) {
nsCOMPtr<nsIContent> content;
mFrame->GetContentForEvent(aGUIEvent, getter_AddRefs(content));
MOZ_ASSERT(mContent == content);
return;
}
// Otherwise, we can check only whether mContent is an inclusive ancestor
// element or not.
if (!mContent->IsElement()) {
MOZ_ASSERT(mContent == mFrame->GetContent());
return;
}
const Element* const closestInclusiveAncestorElement =
[&]() -> const Element* {
for (const nsIContent* const content :
mFrame->GetContent()->InclusiveFlatTreeAncestorsOfType<nsIContent>()) {
if (content->IsElement()) {
return content->AsElement();
}
}
return nullptr;
}();
if (closestInclusiveAncestorElement == mContent) {
return;
}
if (closestInclusiveAncestorElement->IsInNativeAnonymousSubtree() &&
(mContent == closestInclusiveAncestorElement
->FindFirstNonChromeOnlyAccessContent())) {
return;
}
NS_WARNING(nsPrintfCString("mContent=%s", ToString(*mContent).c_str()).get());
NS_WARNING(nsPrintfCString("mFrame->GetContent()=%s",
ToString(*mFrame->GetContent()).c_str())
.get());
MOZ_ASSERT(mContent == mFrame->GetContent());
#endif // #ifdef DEBUG
}
bool PresShell::EventHandler::EventTargetData::MaybeRetargetToActiveDocument(
WidgetGUIEvent* aGUIEvent) {
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(mFrame);
MOZ_ASSERT(mPresShell);
MOZ_ASSERT(!mContent, "Doesn't support to retarget the content");
EventStateManager* activeESM =
EventStateManager::GetActiveEventStateManager();
if (!activeESM) {
return false;
}
if (aGUIEvent->mClass != ePointerEventClass &&
!aGUIEvent->HasMouseEventMessage()) {
return false;
}
if (activeESM == GetEventStateManager()) {
return false;
}
nsPresContext* activePresContext = activeESM->GetPresContext();
if (!activePresContext) {
return false;
}
PresShell* activePresShell = activePresContext->GetPresShell();
if (!activePresShell) {
return false;
}
// Note, currently for backwards compatibility we don't forward mouse events
// to the active document when mouse is over some subdocument.
if (!nsContentUtils::ContentIsCrossDocDescendantOf(
activePresShell->GetDocument(), GetDocument())) {
return false;
}
SetFrameAndComputePresShell(activePresShell->GetRootFrame());
return true;
}
bool PresShell::EventHandler::EventTargetData::ComputeElementFromFrame(
WidgetGUIEvent* aGUIEvent) {
MOZ_ASSERT(aGUIEvent);
MOZ_ASSERT(aGUIEvent->IsUsingCoordinates());
MOZ_ASSERT(mPresShell);
MOZ_ASSERT(mFrame);
SetContentForEventFromFrame(aGUIEvent);
// If there is no content for this frame, target it anyway. Some frames can
// be targeted but do not have content, particularly windows with scrolling
// off.
if (!mContent) {
return true;
}
// Bug 103055, bug 185889: mouse events apply to *elements*, not all nodes.
// Thus we get the nearest element parent here.
// XXX we leave the frame the same even if we find an element parent, so that
// the text frame will receive the event (selection and friends are the ones
// who care about that anyway)
//
// We use weak pointers because during this tight loop, the node
// will *not* go away. And this happens on every mousemove.
nsIContent* content = mContent;
while (content && !content->IsElement()) {
content = content->GetFlattenedTreeParent();
}
mContent = content;
// If we found an element, target it. Otherwise, target *nothing*.
return !!mContent;
}
void PresShell::EventHandler::EventTargetData::UpdateWheelEventTarget(
WidgetGUIEvent* aGUIEvent) {
MOZ_ASSERT(aGUIEvent);
if (aGUIEvent->mMessage != eWheel) {
return;
}
// If dom.event.wheel-event-groups.enabled is not set or the stored
// event target is removed, we will not get a event target frame from the
// wheel transaction here.
nsIFrame* groupFrame = WheelTransaction::GetEventTargetFrame();
if (!groupFrame) {
return;
}
// If dom.event.wheel-event-groups.enabled is set and whe have a stored
// event target from the wheel transaction, override the event target.
SetFrameAndComputePresShellAndContent(groupFrame, aGUIEvent);
}
void PresShell::EventHandler::EventTargetData::UpdateTouchEventTarget(
WidgetGUIEvent* aGUIEvent) {
MOZ_ASSERT(aGUIEvent);
if (aGUIEvent->mClass != eTouchEventClass) {
return;
}
if (aGUIEvent->mMessage == eTouchStart) {
WidgetTouchEvent* touchEvent = aGUIEvent->AsTouchEvent();
nsIFrame* newFrame =
TouchManager::SuppressInvalidPointsAndGetTargetedFrame(touchEvent);
if (!newFrame) {
return;
}
SetFrameAndComputePresShellAndContent(newFrame, aGUIEvent);
return;
}
PresShell* newPresShell = PresShell::GetShellForTouchEvent(aGUIEvent);
if (!newPresShell) {
return; // XXX Why don't we stop handling the event in this case?
}
// Touch events (except touchstart) are dispatching to the captured
// element. Get correct shell from it.
mPresShell = newPresShell;
}
/******************************************************************************
* PresShell::EventHandler::HandlingTimeAccumulator
******************************************************************************/
PresShell::EventHandler::HandlingTimeAccumulator::HandlingTimeAccumulator(
const PresShell::EventHandler& aEventHandler, const WidgetEvent* aEvent)
: mEventHandler(aEventHandler),
mEvent(aEvent),
mHandlingStartTime(TimeStamp::Now()) {
MOZ_ASSERT(mEvent);
MOZ_ASSERT(mEvent->IsTrusted());
}
PresShell::EventHandler::HandlingTimeAccumulator::~HandlingTimeAccumulator() {
if (mEvent->mTimeStamp <= mEventHandler.mPresShell->mLastOSWake) {
return;
}
switch (mEvent->mMessage) {
case eKeyPress:
case eKeyDown:
case eKeyUp:
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_HANDLED_KEYBOARD_MS,
mHandlingStartTime);
return;
case eMouseDown:
Telemetry::AccumulateTimeDelta(
Telemetry::INPUT_EVENT_HANDLED_MOUSE_DOWN_MS, mHandlingStartTime);
return;
case eMouseUp:
Telemetry::AccumulateTimeDelta(Telemetry::INPUT_EVENT_HANDLED_MOUSE_UP_MS,
mHandlingStartTime);
return;
case eMouseMove:
if (mEvent->mFlags.mHandledByAPZ) {
Telemetry::AccumulateTimeDelta(
Telemetry::INPUT_EVENT_HANDLED_APZ_MOUSE_MOVE_MS,
mHandlingStartTime);
}
return;
case eWheel:
if (mEvent->mFlags.mHandledByAPZ) {
Telemetry::AccumulateTimeDelta(
Telemetry::INPUT_EVENT_HANDLED_APZ_WHEEL_MS, mHandlingStartTime);
}
return;
case eTouchMove:
if (mEvent->mFlags.mHandledByAPZ) {
Telemetry::AccumulateTimeDelta(
Telemetry::INPUT_EVENT_HANDLED_APZ_TOUCH_MOVE_MS,
mHandlingStartTime);
}
return;
default:
return;
}
}
void PresShell::EndPaint() {
ClearPendingVisualScrollUpdate();
if (mDocument) {
mDocument->EnumerateSubDocuments([](Document& aSubDoc) {
if (PresShell* presShell = aSubDoc.GetPresShell()) {
presShell->EndPaint();
}
return CallState::Continue;
});
if (nsPresContext* presContext = GetPresContext()) {
if (PerformanceMainThread* perf =
presContext->GetPerformanceMainThread()) {
perf->FinalizeLCPEntriesForText();
}
}
}
}
void PresShell::PingPerTickTelemetry(FlushType aFlushType) {
mLayoutTelemetry.PingPerTickTelemetry(aFlushType);
}
bool PresShell::GetZoomableByAPZ() const {
return mZoomConstraintsClient && mZoomConstraintsClient->GetAllowZoom();
}
bool PresShell::ReflowForHiddenContentIfNeeded() {
if (mHiddenContentInForcedLayout.IsEmpty()) {
return false;
}
mDocument->FlushPendingNotifications(FlushType::Layout);
mHiddenContentInForcedLayout.Clear();
return true;
}
void PresShell::UpdateHiddenContentInForcedLayout(nsIFrame* aFrame) {
if (!aFrame || !aFrame->IsSubtreeDirty() ||
!StaticPrefs::layout_css_content_visibility_enabled()) {
return;
}
nsIFrame* topmostFrameWithContentHidden = nullptr;
for (nsIFrame* cur = aFrame->GetInFlowParent(); cur;
cur = cur->GetInFlowParent()) {
if (cur->HidesContent()) {
topmostFrameWithContentHidden = cur;
mHiddenContentInForcedLayout.Insert(cur->GetContent());
}
}
if (mHiddenContentInForcedLayout.IsEmpty()) {
return;
}
// Queue and immediately flush a reflow for this node.
MOZ_ASSERT(topmostFrameWithContentHidden);
FrameNeedsReflow(topmostFrameWithContentHidden, IntrinsicDirty::None,
NS_FRAME_IS_DIRTY);
}
void PresShell::EnsureReflowIfFrameHasHiddenContent(nsIFrame* aFrame) {
MOZ_ASSERT(mHiddenContentInForcedLayout.IsEmpty());
UpdateHiddenContentInForcedLayout(aFrame);
ReflowForHiddenContentIfNeeded();
}
bool PresShell::IsForcingLayoutForHiddenContent(const nsIFrame* aFrame) const {
return mHiddenContentInForcedLayout.Contains(aFrame->GetContent());
}
void PresShell::UpdateRelevancyOfContentVisibilityAutoFrames() {
if (mContentVisibilityRelevancyToUpdate.isEmpty()) {
return;
}
for (nsIFrame* frame : mContentVisibilityAutoFrames) {
frame->UpdateIsRelevantContent(mContentVisibilityRelevancyToUpdate);
}
if (nsPresContext* presContext = GetPresContext()) {
presContext->UpdateHiddenByContentVisibilityForAnimationsIfNeeded();
}
mContentVisibilityRelevancyToUpdate.clear();
}
void PresShell::ScheduleContentRelevancyUpdate(ContentRelevancyReason aReason) {
if (MOZ_UNLIKELY(mIsDestroying)) {
return;
}
mContentVisibilityRelevancyToUpdate += aReason;
SetNeedLayoutFlush();
if (nsPresContext* presContext = GetPresContext()) {
presContext->RefreshDriver()->EnsureContentRelevancyUpdateHappens();
}
}
PresShell::ProximityToViewportResult PresShell::DetermineProximityToViewport() {
ProximityToViewportResult result;
if (mContentVisibilityAutoFrames.IsEmpty()) {
return result;
}
auto margin = LengthPercentage::FromPercentage(
StaticPrefs::layout_css_content_visibility_relevant_content_margin() /
100.0f);
auto rootMargin = StyleRect<LengthPercentage>::WithAllSides(margin);
auto input = DOMIntersectionObserver::ComputeInput(
*mDocument, /* aRoot = */ nullptr, &rootMargin);
for (nsIFrame* frame : mContentVisibilityAutoFrames) {
auto* element = frame->GetContent()->AsElement();
result.mAnyScrollIntoViewFlag |=
element->TemporarilyVisibleForScrolledIntoViewDescendant();
// 14.2.3.1
Maybe<bool> oldVisibility = element->GetVisibleForContentVisibility();
bool checkForInitialDetermination =
oldVisibility.isNothing() &&
(element->GetContentRelevancy().isNothing() ||
element->GetContentRelevancy()->isEmpty());
// 14.2.3.2
bool intersects =
DOMIntersectionObserver::Intersect(
input, *element,
DOMIntersectionObserver::IsForProximityToViewport::Yes)
.Intersects();
element->SetVisibleForContentVisibility(intersects);
if (oldVisibility.isNothing() || *oldVisibility != intersects) {
frame->UpdateIsRelevantContent(ContentRelevancyReason::Visible);
}
// 14.2.3.3
if (checkForInitialDetermination && intersects) {
result.mHadInitialDetermination = true;
}
}
if (nsPresContext* presContext = GetPresContext()) {
presContext->UpdateHiddenByContentVisibilityForAnimationsIfNeeded();
}
return result;
}
void PresShell::ClearTemporarilyVisibleForScrolledIntoViewDescendantFlags()
const {
for (nsIFrame* frame : mContentVisibilityAutoFrames) {
frame->GetContent()
->AsElement()
->SetTemporarilyVisibleForScrolledIntoViewDescendant(false);
}
}
void PresShell::UpdateContentRelevancyImmediately(
ContentRelevancyReason aReason) {
if (MOZ_UNLIKELY(mIsDestroying)) {
return;
}
mContentVisibilityRelevancyToUpdate += aReason;
SetNeedLayoutFlush();
UpdateRelevancyOfContentVisibilityAutoFrames();
}
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