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fune/layout/xul/nsBoxFrame.cpp
Emilio Cobos Álvarez a7401488af Bug 1784265 - Drop support for flex attribute values other than 0 and 1. r=dholbert,mconley,preferences-reviewers 
This makes it easier to get parity between legacy and regular flex
without having to either have tons of arbitrary attribute selectors in
the xul sheet, nor adding attribute lookup hacks to the html flexbox
layout.

Also, reimplement the remaining supported flex attribute-values (0 and 1)
purely in terms of CSS rules in xul.css (regardless of whether
emulate-moz-box-with-flex is enabled).

In practice these are pretty uncommon and the style attribute does the
trick in every case I've tried.

Add a debug-only assertion to ensure we preserve behavior for now.

Add a new test with another behavior difference between flexbox
emulation and old xul layout because the old reftest now passes. Use
replaced elements, which in modern flex are treated differently.

Differential Revision: https://phabricator.services.mozilla.com/D154394
2022-08-12 23:13:41 +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/. */
//
// Eric Vaughan
// Netscape Communications
//
// See documentation in associated header file
//
// How boxes layout
// ----------------
// Boxes layout a bit differently than html. html does a bottom up layout. Where
// boxes do a top down.
//
// 1) First thing a box does it goes out and askes each child for its min, max,
// and preferred sizes.
//
// 2) It then adds them up to determine its size.
//
// 3) If the box was asked to layout it self intrinically it will layout its
// children at their preferred size otherwise it will layout the child at
// the size it was told to. It will squeeze or stretch its children if
// Necessary.
//
// However there is a catch. Some html components like block frames can not
// determine their preferred size. this is their size if they were laid out
// intrinsically. So the box will flow the child to determine this can cache the
// value.
// Boxes and Incremental Reflow
// ----------------------------
// Boxes layout out top down by adding up their children's min, max, and
// preferred sizes. Only problem is if a incremental reflow occurs. The
// preferred size of a child deep in the hierarchy could change. And this could
// change any number of syblings around the box. Basically any children in the
// reflow chain must have their caches cleared so when asked for there current
// size they can relayout themselves.
#include "nsBoxFrame.h"
#include <algorithm>
#include <utility>
#include "gfxUtils.h"
#include "mozilla/ComputedStyle.h"
#include "mozilla/CSSOrderAwareFrameIterator.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/dom/Touch.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/gfxVars.h"
#include "nsBoxLayout.h"
#include "nsBoxLayoutState.h"
#include "nsCOMPtr.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSRendering.h"
#include "nsContainerFrame.h"
#include "nsDisplayList.h"
#include "nsGkAtoms.h"
#include "nsHTMLParts.h"
#include "nsIContent.h"
#include "nsIFrameInlines.h"
#include "nsIScrollableFrame.h"
#include "nsITheme.h"
#include "nsIWidget.h"
#include "nsLayoutUtils.h"
#include "nsNameSpaceManager.h"
#include "nsPlaceholderFrame.h"
#include "nsPresContext.h"
#include "nsSliderFrame.h"
#include "nsSprocketLayout.h"
#include "nsStyleConsts.h"
#include "nsTransform2D.h"
#include "nsView.h"
#include "nsViewManager.h"
#include "nsWidgetsCID.h"
// Needed for Print Preview
#include "mozilla/TouchEvents.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
nsIFrame* NS_NewBoxFrame(PresShell* aPresShell, ComputedStyle* aStyle,
bool aIsRoot, nsBoxLayout* aLayoutManager) {
return new (aPresShell)
nsBoxFrame(aStyle, aPresShell->GetPresContext(), nsBoxFrame::kClassID,
aIsRoot, aLayoutManager);
}
nsIFrame* NS_NewBoxFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
return new (aPresShell) nsBoxFrame(aStyle, aPresShell->GetPresContext());
}
NS_IMPL_FRAMEARENA_HELPERS(nsBoxFrame)
#ifdef DEBUG
NS_QUERYFRAME_HEAD(nsBoxFrame)
NS_QUERYFRAME_ENTRY(nsBoxFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
#endif
nsBoxFrame::nsBoxFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
ClassID aID, bool aIsRoot, nsBoxLayout* aLayoutManager)
: nsContainerFrame(aStyle, aPresContext, aID), mFlex(0), mAscent(0) {
AddStateBits(NS_STATE_IS_HORIZONTAL | NS_STATE_AUTO_STRETCH);
if (aIsRoot) AddStateBits(NS_STATE_IS_ROOT);
mValign = vAlign_Top;
mHalign = hAlign_Left;
// if no layout manager specified us the static sprocket layout
nsCOMPtr<nsBoxLayout> layout = aLayoutManager;
if (layout == nullptr) {
NS_NewSprocketLayout(layout);
}
SetXULLayoutManager(layout);
}
nsBoxFrame::~nsBoxFrame() = default;
nsIFrame* nsBoxFrame::SlowOrdinalGroupAwareSibling(nsIFrame* aBox, bool aNext) {
nsIFrame* parent = aBox->GetParent();
if (!parent) {
return nullptr;
}
CSSOrderAwareFrameIterator iter(
parent, layout::kPrincipalList,
CSSOrderAwareFrameIterator::ChildFilter::IncludeAll,
CSSOrderAwareFrameIterator::OrderState::Unknown,
CSSOrderAwareFrameIterator::OrderingProperty::BoxOrdinalGroup);
nsIFrame* prevSibling = nullptr;
for (; !iter.AtEnd(); iter.Next()) {
nsIFrame* current = iter.get();
if (!aNext && current == aBox) {
return prevSibling;
}
if (aNext && prevSibling == aBox) {
return current;
}
prevSibling = current;
}
return nullptr;
}
void nsBoxFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList) {
nsContainerFrame::SetInitialChildList(aListID, aChildList);
if (aListID == kPrincipalList) {
// initialize our list of infos.
nsBoxLayoutState state(PresContext());
if (mLayoutManager)
mLayoutManager->ChildrenSet(this, state, mFrames.FirstChild());
}
}
/* virtual */
void nsBoxFrame::DidSetComputedStyle(ComputedStyle* aOldComputedStyle) {
nsContainerFrame::DidSetComputedStyle(aOldComputedStyle);
// The values that CacheAttributes() computes depend on our style,
// so we need to recompute them here...
CacheAttributes();
}
/**
* Initialize us. This is a good time to get the alignment of the box
*/
void nsBoxFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
if (HasAnyStateBits(NS_FRAME_FONT_INFLATION_CONTAINER)) {
AddStateBits(NS_FRAME_FONT_INFLATION_FLOW_ROOT);
}
MarkIntrinsicISizesDirty();
CacheAttributes();
}
void nsBoxFrame::CacheAttributes() {
/*
printf("Caching: ");
XULDumpBox(stdout);
printf("\n");
*/
mValign = vAlign_Top;
mHalign = hAlign_Left;
bool orient = false;
GetInitialOrientation(orient);
if (orient)
AddStateBits(NS_STATE_IS_HORIZONTAL);
else
RemoveStateBits(NS_STATE_IS_HORIZONTAL);
bool normal = true;
GetInitialDirection(normal);
if (normal)
AddStateBits(NS_STATE_IS_DIRECTION_NORMAL);
else
RemoveStateBits(NS_STATE_IS_DIRECTION_NORMAL);
GetInitialVAlignment(mValign);
GetInitialHAlignment(mHalign);
bool equalSize = false;
GetInitialEqualSize(equalSize);
if (equalSize)
AddStateBits(NS_STATE_EQUAL_SIZE);
else
RemoveStateBits(NS_STATE_EQUAL_SIZE);
bool autostretch = !!(mState & NS_STATE_AUTO_STRETCH);
GetInitialAutoStretch(autostretch);
if (autostretch)
AddStateBits(NS_STATE_AUTO_STRETCH);
else
RemoveStateBits(NS_STATE_AUTO_STRETCH);
}
bool nsBoxFrame::GetInitialHAlignment(nsBoxFrame::Halignment& aHalign) {
if (!GetContent()) return false;
// For horizontal boxes we're checking PACK. For vertical boxes we are
// checking ALIGN.
const nsStyleXUL* boxInfo = StyleXUL();
if (IsXULHorizontal()) {
switch (boxInfo->mBoxPack) {
case StyleBoxPack::Start:
aHalign = nsBoxFrame::hAlign_Left;
return true;
case StyleBoxPack::Center:
aHalign = nsBoxFrame::hAlign_Center;
return true;
case StyleBoxPack::End:
aHalign = nsBoxFrame::hAlign_Right;
return true;
default: // Nonsensical value. Just bail.
return false;
}
} else {
switch (boxInfo->mBoxAlign) {
case StyleBoxAlign::Start:
aHalign = nsBoxFrame::hAlign_Left;
return true;
case StyleBoxAlign::Center:
aHalign = nsBoxFrame::hAlign_Center;
return true;
case StyleBoxAlign::End:
aHalign = nsBoxFrame::hAlign_Right;
return true;
default: // Nonsensical value. Just bail.
return false;
}
}
}
bool nsBoxFrame::GetInitialVAlignment(nsBoxFrame::Valignment& aValign) {
if (!GetContent()) return false;
// For horizontal boxes we're checking ALIGN. For vertical boxes we are
// checking PACK.
const nsStyleXUL* boxInfo = StyleXUL();
if (IsXULHorizontal()) {
switch (boxInfo->mBoxAlign) {
case StyleBoxAlign::Start:
aValign = nsBoxFrame::vAlign_Top;
return true;
case StyleBoxAlign::Center:
aValign = nsBoxFrame::vAlign_Middle;
return true;
case StyleBoxAlign::Baseline:
aValign = nsBoxFrame::vAlign_BaseLine;
return true;
case StyleBoxAlign::End:
aValign = nsBoxFrame::vAlign_Bottom;
return true;
default: // Nonsensical value. Just bail.
return false;
}
} else {
switch (boxInfo->mBoxPack) {
case StyleBoxPack::Start:
aValign = nsBoxFrame::vAlign_Top;
return true;
case StyleBoxPack::Center:
aValign = nsBoxFrame::vAlign_Middle;
return true;
case StyleBoxPack::End:
aValign = nsBoxFrame::vAlign_Bottom;
return true;
default: // Nonsensical value. Just bail.
return false;
}
}
}
void nsBoxFrame::GetInitialOrientation(bool& aIsHorizontal) {
// see if we are a vertical or horizontal box.
if (!GetContent()) return;
const nsStyleXUL* boxInfo = StyleXUL();
if (boxInfo->mBoxOrient == StyleBoxOrient::Horizontal) {
aIsHorizontal = true;
} else {
aIsHorizontal = false;
}
}
void nsBoxFrame::GetInitialDirection(bool& aIsNormal) {
if (!GetContent()) return;
if (IsXULHorizontal()) {
// For horizontal boxes only, we initialize our value based off the CSS
// 'direction' property. This means that BiDI users will end up with
// horizontally inverted chrome.
//
// If text runs RTL then so do we.
aIsNormal = StyleVisibility()->mDirection == StyleDirection::Ltr;
if (GetContent()->IsElement()) {
Element* element = GetContent()->AsElement();
// Now see if we have an attribute. The attribute overrides
// the style system 'direction' property.
static Element::AttrValuesArray strings[] = {nsGkAtoms::ltr,
nsGkAtoms::rtl, nullptr};
int32_t index = element->FindAttrValueIn(
kNameSpaceID_None, nsGkAtoms::dir, strings, eCaseMatters);
if (index >= 0) {
bool values[] = {true, false};
aIsNormal = values[index];
}
}
} else {
aIsNormal = true; // Assume a normal direction in the vertical case.
}
// Now check the style system to see if we should invert aIsNormal.
const nsStyleXUL* boxInfo = StyleXUL();
if (boxInfo->mBoxDirection == StyleBoxDirection::Reverse) {
aIsNormal = !aIsNormal; // Invert our direction.
}
}
/* Returns true if it was set.
*/
bool nsBoxFrame::GetInitialEqualSize(bool& aEqualSize) {
// see if we are a vertical or horizontal box.
if (!GetContent() || !GetContent()->IsElement()) return false;
if (GetContent()->AsElement()->AttrValueIs(kNameSpaceID_None,
nsGkAtoms::equalsize,
nsGkAtoms::always, eCaseMatters)) {
aEqualSize = true;
return true;
}
return false;
}
/* Returns true if it was set.
*/
bool nsBoxFrame::GetInitialAutoStretch(bool& aStretch) {
if (!GetContent()) return false;
// Check the CSS box-align property.
const nsStyleXUL* boxInfo = StyleXUL();
aStretch = (boxInfo->mBoxAlign == StyleBoxAlign::Stretch);
return true;
}
void nsBoxFrame::DidReflow(nsPresContext* aPresContext,
const ReflowInput* aReflowInput) {
nsFrameState preserveBits =
mState & (NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN);
nsIFrame::DidReflow(aPresContext, aReflowInput);
AddStateBits(preserveBits);
if (preserveBits & NS_FRAME_IS_DIRTY) {
this->MarkSubtreeDirty();
}
}
bool nsBoxFrame::HonorPrintBackgroundSettings() const {
return !mContent->IsInNativeAnonymousSubtree() &&
nsContainerFrame::HonorPrintBackgroundSettings();
}
#ifdef DO_NOISY_REFLOW
static int myCounter = 0;
static void printSize(char* aDesc, nscoord aSize) {
printf(" %s: ", aDesc);
if (aSize == NS_UNCONSTRAINEDSIZE) {
printf("UC");
} else {
printf("%d", aSize);
}
}
#endif
/* virtual */
nscoord nsBoxFrame::GetMinISize(gfxContext* aRenderingContext) {
nscoord result;
DISPLAY_MIN_INLINE_SIZE(this, result);
nsBoxLayoutState state(PresContext(), aRenderingContext);
nsSize minSize = GetXULMinSize(state);
// GetXULMinSize returns border-box width, and we want to return content
// width. Since Reflow uses the reflow input's border and padding, we
// actually just want to subtract what GetXULMinSize added, which is the
// result of GetXULBorderAndPadding.
nsMargin bp;
GetXULBorderAndPadding(bp);
result = minSize.width - bp.LeftRight();
result = std::max(result, 0);
return result;
}
/* virtual */
nscoord nsBoxFrame::GetPrefISize(gfxContext* aRenderingContext) {
nscoord result;
DISPLAY_PREF_INLINE_SIZE(this, result);
nsBoxLayoutState state(PresContext(), aRenderingContext);
nsSize prefSize = GetXULPrefSize(state);
// GetXULPrefSize returns border-box width, and we want to return content
// width. Since Reflow uses the reflow input's border and padding, we
// actually just want to subtract what GetXULPrefSize added, which is the
// result of GetXULBorderAndPadding.
nsMargin bp;
GetXULBorderAndPadding(bp);
result = prefSize.width - bp.LeftRight();
result = std::max(result, 0);
return result;
}
void nsBoxFrame::Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
MarkInReflow();
// If you make changes to this method, please keep nsLeafBoxFrame::Reflow
// in sync, if the changes are applicable there.
DO_GLOBAL_REFLOW_COUNT("nsBoxFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
NS_ASSERTION(
aReflowInput.ComputedWidth() >= 0 && aReflowInput.ComputedHeight() >= 0,
"Computed Size < 0");
#ifdef DO_NOISY_REFLOW
printf(
"\n-------------Starting BoxFrame Reflow ----------------------------\n");
printf("%p ** nsBF::Reflow %d ", this, myCounter++);
printSize("AW", aReflowInput.AvailableWidth());
printSize("AH", aReflowInput.AvailableHeight());
printSize("CW", aReflowInput.ComputedWidth());
printSize("CH", aReflowInput.ComputedHeight());
printf(" *\n");
#endif
// create the layout state
nsBoxLayoutState state(aPresContext, aReflowInput.mRenderingContext,
&aReflowInput, aReflowInput.mReflowDepth);
WritingMode wm = aReflowInput.GetWritingMode();
LogicalSize computedSize = aReflowInput.ComputedSize();
LogicalMargin m = aReflowInput.ComputedLogicalBorderPadding(wm);
// GetXULBorderAndPadding(m);
LogicalSize prefSize(wm);
// if we are told to layout intrinsic then get our preferred size.
NS_ASSERTION(computedSize.ISize(wm) != NS_UNCONSTRAINEDSIZE,
"computed inline size should always be computed");
if (computedSize.BSize(wm) == NS_UNCONSTRAINEDSIZE) {
nsSize physicalPrefSize = GetXULPrefSize(state);
nsSize minSize = GetXULMinSize(state);
nsSize maxSize = GetXULMaxSize(state);
// XXXbz isn't GetXULPrefSize supposed to bounds-check for us?
physicalPrefSize = XULBoundsCheck(minSize, physicalPrefSize, maxSize);
prefSize = LogicalSize(wm, physicalPrefSize);
}
// get our desiredSize
computedSize.ISize(wm) += m.IStart(wm) + m.IEnd(wm);
if (aReflowInput.ComputedBSize() == NS_UNCONSTRAINEDSIZE) {
computedSize.BSize(wm) = prefSize.BSize(wm);
// prefSize is border-box but min/max constraints are content-box.
nscoord blockDirBorderPadding =
aReflowInput.ComputedLogicalBorderPadding(wm).BStartEnd(wm);
nscoord contentBSize = computedSize.BSize(wm) - blockDirBorderPadding;
// Note: contentHeight might be negative, but that's OK because min-height
// is never negative.
computedSize.BSize(wm) =
aReflowInput.ApplyMinMaxHeight(contentBSize) + blockDirBorderPadding;
} else {
computedSize.BSize(wm) += m.BStart(wm) + m.BEnd(wm);
}
nsSize physicalSize = computedSize.GetPhysicalSize(wm);
nsRect r(mRect.x, mRect.y, physicalSize.width, physicalSize.height);
SetXULBounds(state, r);
// layout our children
XULLayout(state);
// ok our child could have gotten bigger. So lets get its bounds
// get the ascent
LogicalSize boxSize = GetLogicalSize(wm);
nscoord ascent = boxSize.BSize(wm);
// getting the ascent could be a lot of work. Don't get it if
// we are the root. The viewport doesn't care about it.
if (!(mState & NS_STATE_IS_ROOT)) {
ascent = GetXULBoxAscent(state);
}
aDesiredSize.SetSize(wm, boxSize);
aDesiredSize.SetBlockStartAscent(ascent);
aDesiredSize.mOverflowAreas = GetOverflowAreas();
#ifdef DO_NOISY_REFLOW
{
printf("%p ** nsBF(done) W:%d H:%d ", this, aDesiredSize.Width(),
aDesiredSize.Height());
if (maxElementSize) {
printf("MW:%d\n", *maxElementWidth);
} else {
printf("MW:?\n");
}
}
#endif
ReflowAbsoluteFrames(aPresContext, aDesiredSize, aReflowInput, aStatus);
}
nsSize nsBoxFrame::GetXULPrefSize(nsBoxLayoutState& aBoxLayoutState) {
NS_ASSERTION(aBoxLayoutState.GetRenderingContext(),
"must have rendering context");
nsSize size(0, 0);
DISPLAY_PREF_SIZE(this, size);
if (!XULNeedsRecalc(mPrefSize)) {
size = mPrefSize;
return size;
}
if (IsXULCollapsed()) return size;
// if the size was not completely redefined in CSS then ask our children
bool widthSet, heightSet;
if (!nsIFrame::AddXULPrefSize(this, size, widthSet, heightSet)) {
if (mLayoutManager) {
nsSize layoutSize = mLayoutManager->GetXULPrefSize(this, aBoxLayoutState);
if (!widthSet) size.width = layoutSize.width;
if (!heightSet) size.height = layoutSize.height;
} else {
size = nsIFrame::GetUncachedXULPrefSize(aBoxLayoutState);
}
}
nsSize minSize = GetXULMinSize(aBoxLayoutState);
nsSize maxSize = GetXULMaxSize(aBoxLayoutState);
mPrefSize = XULBoundsCheck(minSize, size, maxSize);
return mPrefSize;
}
nscoord nsBoxFrame::GetXULBoxAscent(nsBoxLayoutState& aBoxLayoutState) {
if (!XULNeedsRecalc(mAscent)) {
return mAscent;
}
if (IsXULCollapsed()) {
return 0;
}
if (mLayoutManager) {
mAscent = mLayoutManager->GetAscent(this, aBoxLayoutState);
} else {
mAscent = GetXULPrefSize(aBoxLayoutState).height;
}
return mAscent;
}
nsSize nsBoxFrame::GetXULMinSize(nsBoxLayoutState& aBoxLayoutState) {
NS_ASSERTION(aBoxLayoutState.GetRenderingContext(),
"must have rendering context");
nsSize size(0, 0);
DISPLAY_MIN_SIZE(this, size);
if (!XULNeedsRecalc(mMinSize)) {
size = mMinSize;
return size;
}
if (IsXULCollapsed()) return size;
// if the size was not completely redefined in CSS then ask our children
bool widthSet, heightSet;
if (!nsIFrame::AddXULMinSize(this, size, widthSet, heightSet)) {
if (mLayoutManager) {
nsSize layoutSize = mLayoutManager->GetXULMinSize(this, aBoxLayoutState);
if (!widthSet) size.width = layoutSize.width;
if (!heightSet) size.height = layoutSize.height;
} else {
size = nsIFrame::GetUncachedXULMinSize(aBoxLayoutState);
}
}
mMinSize = size;
return size;
}
nsSize nsBoxFrame::GetXULMaxSize(nsBoxLayoutState& aBoxLayoutState) {
NS_ASSERTION(aBoxLayoutState.GetRenderingContext(),
"must have rendering context");
nsSize size(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
DISPLAY_MAX_SIZE(this, size);
if (!XULNeedsRecalc(mMaxSize)) {
size = mMaxSize;
return size;
}
if (IsXULCollapsed()) return size;
// if the size was not completely redefined in CSS then ask our children
bool widthSet, heightSet;
if (!nsIFrame::AddXULMaxSize(this, size, widthSet, heightSet)) {
if (mLayoutManager) {
nsSize layoutSize = mLayoutManager->GetXULMaxSize(this, aBoxLayoutState);
if (!widthSet) size.width = layoutSize.width;
if (!heightSet) size.height = layoutSize.height;
} else {
size = nsIFrame::GetUncachedXULMaxSize(aBoxLayoutState);
}
}
mMaxSize = size;
return size;
}
int32_t nsBoxFrame::GetXULFlex() {
if (XULNeedsRecalc(mFlex)) {
mFlex = nsIFrame::ComputeXULFlex(this);
}
return mFlex;
}
/**
* If subclassing please subclass this method not layout.
* layout will call this method.
*/
NS_IMETHODIMP
nsBoxFrame::DoXULLayout(nsBoxLayoutState& aState) {
ReflowChildFlags oldFlags = aState.LayoutFlags();
aState.SetLayoutFlags(ReflowChildFlags::Default);
nsresult rv = NS_OK;
if (mLayoutManager) {
XULCoordNeedsRecalc(mAscent);
rv = mLayoutManager->XULLayout(this, aState);
}
aState.SetLayoutFlags(oldFlags);
if (HasAbsolutelyPositionedChildren()) {
// Set up a |reflowInput| to pass into ReflowAbsoluteFrames
WritingMode wm = GetWritingMode();
ReflowInput reflowInput(
aState.PresContext(), this, aState.GetRenderingContext(),
LogicalSize(wm, GetLogicalSize().ISize(wm), NS_UNCONSTRAINEDSIZE));
// Set up a |desiredSize| to pass into ReflowAbsoluteFrames
ReflowOutput desiredSize(reflowInput);
desiredSize.Width() = mRect.width;
desiredSize.Height() = mRect.height;
// get the ascent (cribbed from ::Reflow)
nscoord ascent = mRect.height;
// getting the ascent could be a lot of work. Don't get it if
// we are the root. The viewport doesn't care about it.
if (!(mState & NS_STATE_IS_ROOT)) {
ascent = GetXULBoxAscent(aState);
}
desiredSize.SetBlockStartAscent(ascent);
desiredSize.mOverflowAreas = GetOverflowAreas();
AddStateBits(NS_FRAME_IN_REFLOW);
// Set up a |reflowStatus| to pass into ReflowAbsoluteFrames
// (just a dummy value; hopefully that's OK)
nsReflowStatus reflowStatus;
ReflowAbsoluteFrames(aState.PresContext(), desiredSize, reflowInput,
reflowStatus);
RemoveStateBits(NS_FRAME_IN_REFLOW);
}
return rv;
}
void nsBoxFrame::DestroyFrom(nsIFrame* aDestructRoot,
PostDestroyData& aPostDestroyData) {
// clean up the container box's layout manager and child boxes
SetXULLayoutManager(nullptr);
nsContainerFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
}
/* virtual */
void nsBoxFrame::MarkIntrinsicISizesDirty() {
XULSizeNeedsRecalc(mPrefSize);
XULSizeNeedsRecalc(mMinSize);
XULSizeNeedsRecalc(mMaxSize);
XULCoordNeedsRecalc(mFlex);
XULCoordNeedsRecalc(mAscent);
if (mLayoutManager) {
nsBoxLayoutState state(PresContext());
mLayoutManager->IntrinsicISizesDirty(this, state);
}
nsContainerFrame::MarkIntrinsicISizesDirty();
}
void nsBoxFrame::RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) {
MOZ_ASSERT(aListID == kPrincipalList, "We don't support out-of-flow kids");
nsPresContext* presContext = PresContext();
nsBoxLayoutState state(presContext);
// remove the child frame
mFrames.RemoveFrame(aOldFrame);
// notify the layout manager
if (mLayoutManager) mLayoutManager->ChildrenRemoved(this, state, aOldFrame);
// destroy the child frame
aOldFrame->Destroy();
// mark us dirty and generate a reflow command
PresShell()->FrameNeedsReflow(this, IntrinsicDirty::TreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
}
void nsBoxFrame::InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
const nsLineList::iterator* aPrevFrameLine,
nsFrameList& aFrameList) {
NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == this,
"inserting after sibling frame with different parent");
NS_ASSERTION(!aPrevFrame || mFrames.ContainsFrame(aPrevFrame),
"inserting after sibling frame not in our child list");
MOZ_ASSERT(aListID == kPrincipalList, "We don't support out-of-flow kids");
nsBoxLayoutState state(PresContext());
// insert the child frames
const nsFrameList::Slice& newFrames =
mFrames.InsertFrames(this, aPrevFrame, aFrameList);
// notify the layout manager
if (mLayoutManager)
mLayoutManager->ChildrenInserted(this, state, aPrevFrame, newFrames);
PresShell()->FrameNeedsReflow(this, IntrinsicDirty::TreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
}
void nsBoxFrame::AppendFrames(ChildListID aListID, nsFrameList& aFrameList) {
MOZ_ASSERT(aListID == kPrincipalList, "We don't support out-of-flow kids");
nsBoxLayoutState state(PresContext());
// append the new frames
const nsFrameList::Slice& newFrames = mFrames.AppendFrames(this, aFrameList);
// notify the layout manager
if (mLayoutManager) mLayoutManager->ChildrenAppended(this, state, newFrames);
// XXXbz why is this NS_FRAME_FIRST_REFLOW check here?
if (!HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
PresShell()->FrameNeedsReflow(this, IntrinsicDirty::TreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
}
}
/* virtual */
nsContainerFrame* nsBoxFrame::GetContentInsertionFrame() {
if (HasAnyStateBits(NS_STATE_BOX_WRAPS_KIDS_IN_BLOCK)) {
return PrincipalChildList().FirstChild()->GetContentInsertionFrame();
}
return nsContainerFrame::GetContentInsertionFrame();
}
nsresult nsBoxFrame::AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
int32_t aModType) {
nsresult rv =
nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
// Ignore 'width', 'height', 'screenX', 'screenY' and 'sizemode' on a
// <window>.
if (mContent->IsXULElement(nsGkAtoms::window) &&
(nsGkAtoms::width == aAttribute || nsGkAtoms::height == aAttribute ||
nsGkAtoms::screenX == aAttribute || nsGkAtoms::screenY == aAttribute ||
nsGkAtoms::sizemode == aAttribute)) {
return rv;
}
if (aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height ||
aAttribute == nsGkAtoms::align || aAttribute == nsGkAtoms::valign ||
aAttribute == nsGkAtoms::minwidth || aAttribute == nsGkAtoms::maxwidth ||
aAttribute == nsGkAtoms::minheight ||
aAttribute == nsGkAtoms::maxheight || aAttribute == nsGkAtoms::orient ||
aAttribute == nsGkAtoms::pack || aAttribute == nsGkAtoms::dir ||
aAttribute == nsGkAtoms::equalsize) {
if (aAttribute == nsGkAtoms::align || aAttribute == nsGkAtoms::valign ||
aAttribute == nsGkAtoms::orient || aAttribute == nsGkAtoms::pack ||
aAttribute == nsGkAtoms::dir) {
mValign = nsBoxFrame::vAlign_Top;
mHalign = nsBoxFrame::hAlign_Left;
bool orient = true;
GetInitialOrientation(orient);
if (orient)
AddStateBits(NS_STATE_IS_HORIZONTAL);
else
RemoveStateBits(NS_STATE_IS_HORIZONTAL);
bool normal = true;
GetInitialDirection(normal);
if (normal)
AddStateBits(NS_STATE_IS_DIRECTION_NORMAL);
else
RemoveStateBits(NS_STATE_IS_DIRECTION_NORMAL);
GetInitialVAlignment(mValign);
GetInitialHAlignment(mHalign);
bool equalSize = false;
GetInitialEqualSize(equalSize);
if (equalSize)
AddStateBits(NS_STATE_EQUAL_SIZE);
else
RemoveStateBits(NS_STATE_EQUAL_SIZE);
bool autostretch = !!(mState & NS_STATE_AUTO_STRETCH);
GetInitialAutoStretch(autostretch);
if (autostretch)
AddStateBits(NS_STATE_AUTO_STRETCH);
else
RemoveStateBits(NS_STATE_AUTO_STRETCH);
}
PresShell()->FrameNeedsReflow(this, IntrinsicDirty::StyleChange,
NS_FRAME_IS_DIRTY);
} else if (aAttribute == nsGkAtoms::rows &&
mContent->IsXULElement(nsGkAtoms::tree)) {
// Reflow ourselves and all our children if "rows" changes, since
// nsTreeBodyFrame's layout reads this from its parent (this frame).
PresShell()->FrameNeedsReflow(this, IntrinsicDirty::StyleChange,
NS_FRAME_IS_DIRTY);
}
return rv;
}
void nsBoxFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
bool forceLayer = false;
if (GetContent()->IsXULElement()) {
// forcelayer is only supported on XUL elements with box layout
if (GetContent()->AsElement()->HasAttr(kNameSpaceID_None,
nsGkAtoms::layer)) {
forceLayer = true;
}
// Check for frames that are marked as a part of the region used
// in calculating glass margins on Windows.
const nsStyleDisplay* styles = StyleDisplay();
if (styles->EffectiveAppearance() == StyleAppearance::MozWinExcludeGlass) {
aBuilder->AddWindowExcludeGlassRegion(
this, nsRect(aBuilder->ToReferenceFrame(this), GetSize()));
}
nsStaticAtom* windowButtonTypes[] = {nsGkAtoms::min, nsGkAtoms::max,
nsGkAtoms::close, nullptr};
int32_t buttonTypeIndex = mContent->AsElement()->FindAttrValueIn(
kNameSpaceID_None, nsGkAtoms::titlebar_button, windowButtonTypes,
eCaseMatters);
if (buttonTypeIndex >= 0) {
MOZ_ASSERT(buttonTypeIndex < 3);
if (auto* widget = GetNearestWidget()) {
using ButtonType = nsIWidget::WindowButtonType;
auto buttonType = buttonTypeIndex == 0
? ButtonType::Minimize
: (buttonTypeIndex == 1 ? ButtonType::Maximize
: ButtonType::Close);
auto rect = LayoutDevicePixel::FromAppUnitsToNearest(
nsRect(aBuilder->ToReferenceFrame(this), GetSize()),
PresContext()->AppUnitsPerDevPixel());
widget->SetWindowButtonRect(buttonType, rect);
}
}
}
nsDisplayListCollection tempLists(aBuilder);
const nsDisplayListSet& destination = (forceLayer) ? tempLists : aLists;
DisplayBorderBackgroundOutline(aBuilder, destination);
Maybe<nsDisplayListBuilder::AutoContainerASRTracker> contASRTracker;
if (forceLayer) {
contASRTracker.emplace(aBuilder);
}
BuildDisplayListForChildren(aBuilder, destination);
// see if we have to draw a selection frame around this container
DisplaySelectionOverlay(aBuilder, destination.Content());
if (forceLayer) {
// This is a bit of a hack. Collect up all descendant display items
// and merge them into a single Content() list. This can cause us
// to violate CSS stacking order, but forceLayer is a magic
// XUL-only extension anyway.
nsDisplayList masterList(aBuilder);
masterList.AppendToTop(tempLists.BorderBackground());
masterList.AppendToTop(tempLists.BlockBorderBackgrounds());
masterList.AppendToTop(tempLists.Floats());
masterList.AppendToTop(tempLists.Content());
masterList.AppendToTop(tempLists.PositionedDescendants());
masterList.AppendToTop(tempLists.Outlines());
const ActiveScrolledRoot* ownLayerASR = contASRTracker->GetContainerASR();
DisplayListClipState::AutoSaveRestore ownLayerClipState(aBuilder);
// Wrap the list to make it its own layer
aLists.Content()->AppendNewToTopWithIndex<nsDisplayOwnLayer>(
aBuilder, this, /* aIndex = */ nsDisplayOwnLayer::OwnLayerForBoxFrame,
&masterList, ownLayerASR, mozilla::nsDisplayOwnLayerFlags::None,
mozilla::layers::ScrollbarData{}, true, true);
}
}
void nsBoxFrame::BuildDisplayListForChildren(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
// Iterate over the children in CSS order.
auto iter = CSSOrderAwareFrameIterator(
this, mozilla::layout::kPrincipalList,
CSSOrderAwareFrameIterator::ChildFilter::IncludeAll,
CSSOrderAwareFrameIterator::OrderState::Unknown,
CSSOrderAwareFrameIterator::OrderingProperty::BoxOrdinalGroup);
// Put each child's background onto the BlockBorderBackgrounds list
// to emulate the existing two-layer XUL painting scheme.
nsDisplayListSet set(aLists, aLists.BlockBorderBackgrounds());
for (; !iter.AtEnd(); iter.Next()) {
BuildDisplayListForChild(aBuilder, iter.get(), set);
}
}
#ifdef DEBUG_FRAME_DUMP
nsresult nsBoxFrame::GetFrameName(nsAString& aResult) const {
return MakeFrameName(u"Box"_ns, aResult);
}
#endif
void nsBoxFrame::AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) {
if (HasAnyStateBits(NS_STATE_BOX_WRAPS_KIDS_IN_BLOCK)) {
aResult.AppendElement(OwnedAnonBox(PrincipalChildList().FirstChild()));
}
}
nsresult nsBoxFrame::LayoutChildAt(nsBoxLayoutState& aState, nsIFrame* aBox,
const nsRect& aRect) {
// get the current rect
nsRect oldRect(aBox->GetRect());
aBox->SetXULBounds(aState, aRect);
bool layout = aBox->IsSubtreeDirty();
if (layout ||
(oldRect.width != aRect.width || oldRect.height != aRect.height)) {
return aBox->XULLayout(aState);
}
return NS_OK;
}
namespace mozilla {
/**
* This wrapper class lets us redirect mouse hits from descendant frames
* of a menu to the menu itself, if they didn't specify 'allowevents'.
*
* The wrapper simply turns a hit on a descendant element
* into a hit on the menu itself, unless there is an element between the target
* and the menu with the "allowevents" attribute.
*
* This is used by nsMenuFrame and nsTreeColFrame.
*
* Note that turning a hit on a descendant element into nullptr, so events
* could fall through to the menu background, might be an appealing
* simplification but it would mean slightly strange behaviour in some cases,
* because grabber wrappers can be created for many individual lists and items,
* so the exact fallthrough behaviour would be complex. E.g. an element with
* "allowevents" on top of the Content() list could receive the event even if it
* was covered by a PositionedDescenants() element without "allowevents". It is
* best to never convert a non-null hit into null.
*/
// REVIEW: This is roughly of what nsMenuFrame::GetFrameForPoint used to do.
// I've made 'allowevents' affect child elements because that seems the only
// reasonable thing to do.
class nsDisplayXULEventRedirector final : public nsDisplayWrapList {
public:
nsDisplayXULEventRedirector(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
nsDisplayItem* aItem, nsIFrame* aTargetFrame)
: nsDisplayWrapList(aBuilder, aFrame, aItem),
mTargetFrame(aTargetFrame) {}
nsDisplayXULEventRedirector(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
nsDisplayList* aList, nsIFrame* aTargetFrame)
: nsDisplayWrapList(aBuilder, aFrame, aList),
mTargetFrame(aTargetFrame) {}
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) override;
virtual bool ShouldFlattenAway(nsDisplayListBuilder* aBuilder) override {
return false;
}
void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override {
GetChildren()->Paint(aBuilder, aCtx,
mFrame->PresContext()->AppUnitsPerDevPixel());
}
NS_DISPLAY_DECL_NAME("XULEventRedirector", TYPE_XUL_EVENT_REDIRECTOR)
private:
nsIFrame* mTargetFrame;
};
void nsDisplayXULEventRedirector::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
nsTArray<nsIFrame*> outFrames;
mList.HitTest(aBuilder, aRect, aState, &outFrames);
bool topMostAdded = false;
uint32_t localLength = outFrames.Length();
for (uint32_t i = 0; i < localLength; i++) {
for (nsIContent* content = outFrames.ElementAt(i)->GetContent();
content && content != mTargetFrame->GetContent();
content = content->GetParent()) {
if (!content->IsElement() ||
!content->AsElement()->AttrValueIs(kNameSpaceID_None,
nsGkAtoms::allowevents,
nsGkAtoms::_true, eCaseMatters)) {
continue;
}
// Events are allowed on 'frame', so let it go.
aOutFrames->AppendElement(outFrames.ElementAt(i));
topMostAdded = true;
}
// If there was no hit on the topmost frame or its ancestors,
// add the target frame itself as the first candidate (see bug 562554).
if (!topMostAdded) {
topMostAdded = true;
aOutFrames->AppendElement(mTargetFrame);
}
}
}
} // namespace mozilla
class nsXULEventRedirectorWrapper final : public nsDisplayItemWrapper {
public:
explicit nsXULEventRedirectorWrapper(nsIFrame* aTargetFrame)
: mTargetFrame(aTargetFrame) {}
virtual nsDisplayItem* WrapList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aList) override {
return MakeDisplayItem<nsDisplayXULEventRedirector>(aBuilder, aFrame, aList,
mTargetFrame);
}
virtual nsDisplayItem* WrapItem(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem) override {
return MakeDisplayItem<nsDisplayXULEventRedirector>(
aBuilder, aItem->Frame(), aItem, mTargetFrame);
}
private:
nsIFrame* mTargetFrame;
};
void nsBoxFrame::WrapListsInRedirector(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aIn,
const nsDisplayListSet& aOut) {
nsXULEventRedirectorWrapper wrapper(this);
wrapper.WrapLists(aBuilder, this, aIn, aOut);
}
bool nsBoxFrame::GetEventPoint(WidgetGUIEvent* aEvent, nsPoint& aPoint) {
LayoutDeviceIntPoint refPoint;
bool res = GetEventPoint(aEvent, refPoint);
aPoint = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, refPoint,
RelativeTo{this});
return res;
}
bool nsBoxFrame::GetEventPoint(WidgetGUIEvent* aEvent,
LayoutDeviceIntPoint& aPoint) {
NS_ENSURE_TRUE(aEvent, false);
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
if (touchEvent) {
// return false if there is more than one touch on the page, or if
// we can't find a touch point
if (touchEvent->mTouches.Length() != 1) {
return false;
}
dom::Touch* touch = touchEvent->mTouches.SafeElementAt(0);
if (!touch) {
return false;
}
aPoint = touch->mRefPoint;
} else {
aPoint = aEvent->mRefPoint;
}
return true;
}
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