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fune/layout/forms/nsComboboxControlFrame.cpp

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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/. */
#include "nsComboboxControlFrame.h"
#include "gfxContext.h"
#include "gfxUtils.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/PathHelpers.h"
#include "nsCOMPtr.h"
#include "nsDeviceContext.h"
#include "nsFocusManager.h"
#include "nsCheckboxRadioFrame.h"
#include "nsGkAtoms.h"
#include "nsCSSAnonBoxes.h"
#include "nsHTMLParts.h"
#include "nsIFormControl.h"
#include "nsILayoutHistoryState.h"
#include "nsNameSpaceManager.h"
#include "nsListControlFrame.h"
#include "nsPIDOMWindow.h"
#include "mozilla/PresState.h"
#include "nsView.h"
#include "nsViewManager.h"
#include "nsIContentInlines.h"
#include "nsIDOMEventListener.h"
#include "nsISelectControlFrame.h"
#include "nsContentUtils.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/HTMLSelectElement.h"
#include "mozilla/dom/Document.h"
#include "nsIScrollableFrame.h"
#include "mozilla/ServoStyleSet.h"
#include "nsNodeInfoManager.h"
#include "nsContentCreatorFunctions.h"
#include "nsLayoutUtils.h"
#include "nsDisplayList.h"
#include "nsITheme.h"
#include "nsStyleConsts.h"
#include "nsTextFrameUtils.h"
#include "nsTextRunTransformations.h"
#include "HTMLSelectEventListener.h"
#include "mozilla/Likely.h"
#include <algorithm>
#include "nsTextNode.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/EventStates.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/PresShell.h"
#include "mozilla/PresShellInlines.h"
#include "mozilla/Unused.h"
#include "gfx2DGlue.h"
#include "mozilla/widget/nsAutoRollup.h"
using namespace mozilla;
using namespace mozilla::gfx;
NS_IMETHODIMP
nsComboboxControlFrame::RedisplayTextEvent::Run() {
if (mControlFrame) mControlFrame->HandleRedisplayTextEvent();
return NS_OK;
}
// Drop down list event management.
// The combo box uses the following strategy for managing the drop-down list.
// If the combo box or its arrow button is clicked on the drop-down list is
// displayed If mouse exits the combo box with the drop-down list displayed the
// drop-down list is asked to capture events The drop-down list will capture all
// events including mouse down and up and will always return with
// ListWasSelected method call regardless of whether an item in the list was
// actually selected.
// The ListWasSelected code will turn off mouse-capture for the drop-down list.
// The drop-down list does not explicitly set capture when it is in the
// drop-down mode.
nsComboboxControlFrame* NS_NewComboboxControlFrame(PresShell* aPresShell,
ComputedStyle* aStyle,
nsFrameState aStateFlags) {
nsComboboxControlFrame* it = new (aPresShell)
nsComboboxControlFrame(aStyle, aPresShell->GetPresContext());
if (it) {
// set the state flags (if any are provided)
it->AddStateBits(aStateFlags);
}
return it;
}
NS_IMPL_FRAMEARENA_HELPERS(nsComboboxControlFrame)
//-----------------------------------------------------------
// Reflow Debugging Macros
// These let us "see" how many reflow counts are happening
//-----------------------------------------------------------
#ifdef DO_REFLOW_COUNTER
# define MAX_REFLOW_CNT 1024
static int32_t gTotalReqs = 0;
;
static int32_t gTotalReflows = 0;
;
static int32_t gReflowControlCntRQ[MAX_REFLOW_CNT];
static int32_t gReflowControlCnt[MAX_REFLOW_CNT];
static int32_t gReflowInx = -1;
# define REFLOW_COUNTER() \
if (mReflowId > -1) gReflowControlCnt[mReflowId]++;
# define REFLOW_COUNTER_REQUEST() \
if (mReflowId > -1) gReflowControlCntRQ[mReflowId]++;
# define REFLOW_COUNTER_DUMP(__desc) \
if (mReflowId > -1) { \
gTotalReqs += gReflowControlCntRQ[mReflowId]; \
gTotalReflows += gReflowControlCnt[mReflowId]; \
printf("** Id:%5d %s RF: %d RQ: %d %d/%d %5.2f\n", mReflowId, \
(__desc), gReflowControlCnt[mReflowId], \
gReflowControlCntRQ[mReflowId], gTotalReflows, gTotalReqs, \
float(gTotalReflows) / float(gTotalReqs) * 100.0f); \
}
# define REFLOW_COUNTER_INIT() \
if (gReflowInx < MAX_REFLOW_CNT) { \
gReflowInx++; \
mReflowId = gReflowInx; \
gReflowControlCnt[mReflowId] = 0; \
gReflowControlCntRQ[mReflowId] = 0; \
} else { \
mReflowId = -1; \
}
// reflow messages
# define REFLOW_DEBUG_MSG(_msg1) printf((_msg1))
# define REFLOW_DEBUG_MSG2(_msg1, _msg2) printf((_msg1), (_msg2))
# define REFLOW_DEBUG_MSG3(_msg1, _msg2, _msg3) \
printf((_msg1), (_msg2), (_msg3))
# define REFLOW_DEBUG_MSG4(_msg1, _msg2, _msg3, _msg4) \
printf((_msg1), (_msg2), (_msg3), (_msg4))
#else //-------------
# define REFLOW_COUNTER_REQUEST()
# define REFLOW_COUNTER()
# define REFLOW_COUNTER_DUMP(__desc)
# define REFLOW_COUNTER_INIT()
# define REFLOW_DEBUG_MSG(_msg)
# define REFLOW_DEBUG_MSG2(_msg1, _msg2)
# define REFLOW_DEBUG_MSG3(_msg1, _msg2, _msg3)
# define REFLOW_DEBUG_MSG4(_msg1, _msg2, _msg3, _msg4)
#endif
//------------------------------------------
// This is for being VERY noisy
//------------------------------------------
#ifdef DO_VERY_NOISY
# define REFLOW_NOISY_MSG(_msg1) printf((_msg1))
# define REFLOW_NOISY_MSG2(_msg1, _msg2) printf((_msg1), (_msg2))
# define REFLOW_NOISY_MSG3(_msg1, _msg2, _msg3) \
printf((_msg1), (_msg2), (_msg3))
# define REFLOW_NOISY_MSG4(_msg1, _msg2, _msg3, _msg4) \
printf((_msg1), (_msg2), (_msg3), (_msg4))
#else
# define REFLOW_NOISY_MSG(_msg)
# define REFLOW_NOISY_MSG2(_msg1, _msg2)
# define REFLOW_NOISY_MSG3(_msg1, _msg2, _msg3)
# define REFLOW_NOISY_MSG4(_msg1, _msg2, _msg3, _msg4)
#endif
//------------------------------------------
// Displays value in pixels or twips
//------------------------------------------
#ifdef DO_PIXELS
# define PX(__v) __v / 15
#else
# define PX(__v) __v
#endif
//------------------------------------------------------
//-- Done with macros
//------------------------------------------------------
nsComboboxControlFrame::nsComboboxControlFrame(ComputedStyle* aStyle,
nsPresContext* aPresContext)
: nsBlockFrame(aStyle, aPresContext, kClassID),
mDisplayFrame(nullptr),
mButtonFrame(nullptr),
mDisplayISize(0),
mMaxDisplayISize(0),
mRecentSelectedIndex(NS_SKIP_NOTIFY_INDEX),
mDisplayedIndex(-1),
mInRedisplayText(false),
mIsOpenInParentProcess(false){REFLOW_COUNTER_INIT()}
//--------------------------------------------------------------
nsComboboxControlFrame::~nsComboboxControlFrame() {
REFLOW_COUNTER_DUMP("nsCCF");
}
//--------------------------------------------------------------
NS_QUERYFRAME_HEAD(nsComboboxControlFrame)
NS_QUERYFRAME_ENTRY(nsComboboxControlFrame)
NS_QUERYFRAME_ENTRY(nsIFormControlFrame)
NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
NS_QUERYFRAME_ENTRY(nsISelectControlFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsBlockFrame)
#ifdef ACCESSIBILITY
a11y::AccType nsComboboxControlFrame::AccessibleType() {
return a11y::eHTMLComboboxType;
}
#endif
void nsComboboxControlFrame::SetFocus(bool aOn, bool aRepaint) {
// This is needed on a temporary basis. It causes the focus
// rect to be drawn. This is much faster than ReResolvingStyle
// Bug 32920
InvalidateFrame();
}
nsPoint nsComboboxControlFrame::GetCSSTransformTranslation() {
nsIFrame* frame = this;
bool is3DTransform = false;
Matrix transform;
while (frame) {
nsIFrame* parent;
Matrix4x4Flagged ctm = frame->GetTransformMatrix(
ViewportType::Layout, RelativeTo{nullptr}, &parent);
Matrix matrix;
if (ctm.Is2D(&matrix)) {
transform = transform * matrix;
} else {
is3DTransform = true;
break;
}
frame = parent;
}
nsPoint translation;
if (!is3DTransform && !transform.HasNonTranslation()) {
nsPresContext* pc = PresContext();
// To get the translation introduced only by transforms we subtract the
// regular non-transform translation.
nsRootPresContext* rootPC = pc->GetRootPresContext();
if (rootPC) {
int32_t apd = pc->AppUnitsPerDevPixel();
translation.x = NSFloatPixelsToAppUnits(transform._31, apd);
translation.y = NSFloatPixelsToAppUnits(transform._32, apd);
translation -= GetOffsetToCrossDoc(rootPC->PresShell()->GetRootFrame());
}
}
return translation;
}
//----------------------------------------------------------
//
//----------------------------------------------------------
#ifdef DO_REFLOW_DEBUG
static int myCounter = 0;
static void printSize(char* aDesc, nscoord aSize) {
printf(" %s: ", aDesc);
if (aSize == NS_UNCONSTRAINEDSIZE) {
printf("UC");
} else {
printf("%d", PX(aSize));
}
}
#endif
//-------------------------------------------------------------------
//-- Main Reflow for the Combobox
//-------------------------------------------------------------------
bool nsComboboxControlFrame::HasDropDownButton() const {
const nsStyleDisplay* disp = StyleDisplay();
// FIXME(emilio): Blink also shows this for menulist-button and such... Seems
// more similar to our mac / linux implementation.
return disp->EffectiveAppearance() == StyleAppearance::Menulist &&
(!IsThemed(disp) ||
PresContext()->Theme()->ThemeNeedsComboboxDropmarker());
}
nscoord nsComboboxControlFrame::DropDownButtonISize() {
if (!HasDropDownButton()) {
return 0;
}
LayoutDeviceIntSize dropdownButtonSize;
bool canOverride = true;
nsPresContext* presContext = PresContext();
presContext->Theme()->GetMinimumWidgetSize(
presContext, this, StyleAppearance::MozMenulistArrowButton,
&dropdownButtonSize, &canOverride);
return presContext->DevPixelsToAppUnits(dropdownButtonSize.width);
}
int32_t nsComboboxControlFrame::CharCountOfLargestOptionForInflation() const {
uint32_t maxLength = 0;
nsAutoString label;
for (auto i : IntegerRange(Select().Options()->Length())) {
GetOptionText(i, label);
maxLength = std::max(
maxLength,
nsTextFrameUtils::ComputeApproximateLengthWithWhitespaceCompression(
label, StyleText()));
}
if (MOZ_UNLIKELY(maxLength > uint32_t(INT32_MAX))) {
return INT32_MAX;
}
return int32_t(maxLength);
}
nscoord nsComboboxControlFrame::GetIntrinsicISize(gfxContext* aRenderingContext,
IntrinsicISizeType aType) {
nscoord displayISize = mDisplayFrame->IntrinsicISizeOffsets().padding;
if (!StyleDisplay()->GetContainSizeAxes().mIContained &&
!StyleContent()->mContent.IsNone()) {
// Compute the width of each option's (potentially text-transformed) text,
// and use the widest one as part of our intrinsic size.
nscoord maxOptionSize = 0;
nsAutoString label;
nsAutoString transformedLabel;
RefPtr<nsFontMetrics> fm =
nsLayoutUtils::GetInflatedFontMetricsForFrame(this);
auto textTransform = StyleText()->mTextTransform.IsNone()
? Nothing()
: Some(StyleText()->mTextTransform);
nsAtom* language = StyleFont()->mLanguage;
AutoTArray<bool, 50> charsToMergeArray;
AutoTArray<bool, 50> deletedCharsArray;
for (auto i : IntegerRange(Select().Options()->Length())) {
GetOptionText(i, label);
const nsAutoString* stringToUse = &label;
if (textTransform) {
transformedLabel.Truncate();
charsToMergeArray.SetLengthAndRetainStorage(0);
deletedCharsArray.SetLengthAndRetainStorage(0);
nsCaseTransformTextRunFactory::TransformString(
label, transformedLabel, textTransform,
/* aCaseTransformsOnly = */ false, language, charsToMergeArray,
deletedCharsArray);
stringToUse = &transformedLabel;
}
maxOptionSize = std::max(
maxOptionSize, nsLayoutUtils::AppUnitWidthOfStringBidi(
*stringToUse, this, *fm, *aRenderingContext));
}
displayISize += maxOptionSize;
}
// Add room for the dropmarker button (if there is one).
displayISize += DropDownButtonISize();
return displayISize;
}
nscoord nsComboboxControlFrame::GetMinISize(gfxContext* aRenderingContext) {
nscoord minISize;
DISPLAY_MIN_INLINE_SIZE(this, minISize);
minISize = GetIntrinsicISize(aRenderingContext, IntrinsicISizeType::MinISize);
return minISize;
}
nscoord nsComboboxControlFrame::GetPrefISize(gfxContext* aRenderingContext) {
nscoord prefISize;
DISPLAY_PREF_INLINE_SIZE(this, prefISize);
prefISize =
GetIntrinsicISize(aRenderingContext, IntrinsicISizeType::PrefISize);
return prefISize;
}
dom::HTMLSelectElement& nsComboboxControlFrame::Select() const {
return *static_cast<dom::HTMLSelectElement*>(GetContent());
}
void nsComboboxControlFrame::GetOptionText(uint32_t aIndex,
nsAString& aText) const {
aText.Truncate();
if (Element* el = Select().Options()->GetElementAt(aIndex)) {
static_cast<dom::HTMLOptionElement*>(el)->GetRenderedLabel(aText);
}
}
void nsComboboxControlFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
MarkInReflow();
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
// Constraints we try to satisfy:
// 1) Default inline size of button is the vertical scrollbar size
// 2) If the inline size of button is bigger than our inline size, set
// inline size of button to 0.
// 3) Default block size of button is block size of display area
// 4) Inline size of display area is whatever is left over from our
// inline size after allocating inline size for the button.
if (!mDisplayFrame || !mButtonFrame) {
NS_ERROR("Why did the frame constructor allow this to happen? Fix it!!");
return;
}
// Make sure the displayed text is the same as the selected option,
// bug 297389.
mDisplayedIndex = Select().SelectedIndex();
// In dropped down mode the "selected index" is the hovered menu item,
// we want the last selected item which is |mDisplayedIndex| in this case.
RedisplayText();
WritingMode wm = aReflowInput.GetWritingMode();
// Check if the theme specifies a minimum size for the dropdown button
// first.
const nscoord buttonISize = DropDownButtonISize();
const auto borderPadding = aReflowInput.ComputedLogicalBorderPadding(wm);
const auto padding = aReflowInput.ComputedLogicalPadding(wm);
const auto border = borderPadding - padding;
mDisplayISize = aReflowInput.ComputedISize() - buttonISize;
mMaxDisplayISize = mDisplayISize + padding.IEnd(wm);
nsBlockFrame::Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus);
// The button should occupy the same space as a scrollbar, and its position
// starts from the border edge.
LogicalRect buttonRect(wm);
buttonRect.IStart(wm) = borderPadding.IStart(wm) + mMaxDisplayISize;
buttonRect.BStart(wm) = border.BStart(wm);
buttonRect.ISize(wm) = buttonISize;
buttonRect.BSize(wm) = mDisplayFrame->BSize(wm) + padding.BStartEnd(wm);
const nsSize containerSize = aDesiredSize.PhysicalSize();
mButtonFrame->SetRect(buttonRect, containerSize);
if (!aStatus.IsInlineBreakBefore() && !aStatus.IsFullyComplete()) {
// This frame didn't fit inside a fragmentation container. Splitting
// a nsComboboxControlFrame makes no sense, so we override the status here.
aStatus.Reset();
}
}
void nsComboboxControlFrame::Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
nsBlockFrame::Init(aContent, aParent, aPrevInFlow);
mEventListener = new HTMLSelectEventListener(
Select(), HTMLSelectEventListener::SelectType::Combobox);
}
#ifdef DEBUG_FRAME_DUMP
nsresult nsComboboxControlFrame::GetFrameName(nsAString& aResult) const {
return MakeFrameName(u"ComboboxControl"_ns, aResult);
}
#endif
///////////////////////////////////////////////////////////////
nsresult nsComboboxControlFrame::RedisplaySelectedText() {
nsAutoScriptBlocker scriptBlocker;
mDisplayedIndex = Select().SelectedIndex();
return RedisplayText();
}
nsresult nsComboboxControlFrame::RedisplayText() {
nsString previewValue;
nsString previousText(mDisplayedOptionTextOrPreview);
Select().GetPreviewValue(previewValue);
// Get the text to display
if (!previewValue.IsEmpty()) {
mDisplayedOptionTextOrPreview = previewValue;
} else if (mDisplayedIndex != -1 && !StyleContent()->mContent.IsNone()) {
GetOptionText(mDisplayedIndex, mDisplayedOptionTextOrPreview);
} else {
mDisplayedOptionTextOrPreview.Truncate();
}
REFLOW_DEBUG_MSG2(
"RedisplayText \"%s\"\n",
NS_LossyConvertUTF16toASCII(mDisplayedOptionTextOrPreview).get());
// Send reflow command because the new text maybe larger
nsresult rv = NS_OK;
if (mDisplayContent && !previousText.Equals(mDisplayedOptionTextOrPreview)) {
// Don't call ActuallyDisplayText(true) directly here since that
// could cause recursive frame construction. See bug 283117 and the comment
// in HandleRedisplayTextEvent() below.
// Revoke outstanding events to avoid out-of-order events which could mean
// displaying the wrong text.
mRedisplayTextEvent.Revoke();
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"If we happen to run our redisplay event now, we might kill "
"ourselves!");
mRedisplayTextEvent = new RedisplayTextEvent(this);
nsContentUtils::AddScriptRunner(mRedisplayTextEvent.get());
}
return rv;
}
void nsComboboxControlFrame::HandleRedisplayTextEvent() {
// First, make sure that the content model is up to date and we've
// constructed the frames for all our content in the right places.
// Otherwise they'll end up under the wrong insertion frame when we
// ActuallyDisplayText, since that flushes out the content sink by
// calling SetText on a DOM node with aNotify set to true. See bug
// 289730.
AutoWeakFrame weakThis(this);
PresContext()->Document()->FlushPendingNotifications(
FlushType::ContentAndNotify);
if (!weakThis.IsAlive()) return;
// Redirect frame insertions during this method (see
// GetContentInsertionFrame()) so that any reframing that the frame
// constructor forces upon us is inserted into the correct parent
// (mDisplayFrame). See bug 282607.
MOZ_ASSERT(!mInRedisplayText, "Nested RedisplayText");
mInRedisplayText = true;
mRedisplayTextEvent.Forget();
ActuallyDisplayText(true);
if (!weakThis.IsAlive()) {
return;
}
// XXXbz This should perhaps be eResize. Check.
PresShell()->FrameNeedsReflow(mDisplayFrame, IntrinsicDirty::StyleChange,
NS_FRAME_IS_DIRTY);
mInRedisplayText = false;
}
void nsComboboxControlFrame::ActuallyDisplayText(bool aNotify) {
RefPtr<nsTextNode> displayContent = mDisplayContent;
if (mDisplayedOptionTextOrPreview.IsEmpty()) {
// Have to use a space character of some sort for line-block-size
// calculations to be right. Also, the space character must be zero-width
// in order for the the inline-size calculations to be consistent between
// size-contained comboboxes vs. empty comboboxes.
//
// XXXdholbert Does this space need to be "non-breaking"? I'm not sure
// if it matters, but we previously had a comment here (added in 2002)
// saying "Have to use a non-breaking space for line-height calculations
// to be right". So I'll stick with a non-breaking space for now...
static const char16_t space = 0xFEFF;
displayContent->SetText(&space, 1, aNotify);
} else {
displayContent->SetText(mDisplayedOptionTextOrPreview, aNotify);
}
}
int32_t nsComboboxControlFrame::GetIndexOfDisplayArea() {
return mDisplayedIndex;
}
bool nsComboboxControlFrame::IsDroppedDown() const {
return Select().OpenInParentProcess();
}
//----------------------------------------------------------------------
// nsISelectControlFrame
//----------------------------------------------------------------------
NS_IMETHODIMP
nsComboboxControlFrame::DoneAddingChildren(bool aIsDone) { return NS_OK; }
NS_IMETHODIMP
nsComboboxControlFrame::AddOption(int32_t aIndex) {
if (aIndex <= mDisplayedIndex) {
++mDisplayedIndex;
}
return NS_OK;
}
NS_IMETHODIMP
nsComboboxControlFrame::RemoveOption(int32_t aIndex) {
if (Select().Options()->Length()) {
if (aIndex < mDisplayedIndex) {
--mDisplayedIndex;
} else if (aIndex == mDisplayedIndex) {
mDisplayedIndex = 0; // IE6 compat
RedisplayText();
}
} else {
// If we removed the last option, we need to blank things out
mDisplayedIndex = -1;
RedisplayText();
}
return NS_OK;
}
NS_IMETHODIMP_(void)
nsComboboxControlFrame::OnSetSelectedIndex(int32_t aOldIndex,
int32_t aNewIndex) {
nsAutoScriptBlocker scriptBlocker;
mDisplayedIndex = aNewIndex;
RedisplayText();
}
// End nsISelectControlFrame
//----------------------------------------------------------------------
nsresult nsComboboxControlFrame::HandleEvent(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
NS_ENSURE_ARG_POINTER(aEventStatus);
if (nsEventStatus_eConsumeNoDefault == *aEventStatus) {
return NS_OK;
}
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED)) {
return NS_OK;
}
// If we have style that affects how we are selected, feed event down to
// nsIFrame::HandleEvent so that selection takes place when appropriate.
if (IsContentDisabled()) {
return nsBlockFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
return NS_OK;
}
nsContainerFrame* nsComboboxControlFrame::GetContentInsertionFrame() {
return mInRedisplayText ? mDisplayFrame : nullptr;
}
void nsComboboxControlFrame::AppendDirectlyOwnedAnonBoxes(
nsTArray<OwnedAnonBox>& aResult) {
aResult.AppendElement(OwnedAnonBox(mDisplayFrame));
}
nsresult nsComboboxControlFrame::CreateAnonymousContent(
nsTArray<ContentInfo>& aElements) {
// The frames used to display the combo box and the button used to popup the
// dropdown list are created through anonymous content. The dropdown list is
// not created through anonymous content because its frame is initialized
// specifically for the drop-down case and it is placed a special list
// referenced through NS_COMBO_FRAME_POPUP_LIST_INDEX to keep separate from
// the layout of the display and button.
//
// Note: The value attribute of the display content is set when an item is
// selected in the dropdown list. If the content specified below does not
// honor the value attribute than nothing will be displayed.
// For now the content that is created corresponds to two input buttons. It
// would be better to create the tag as something other than input, but then
// there isn't any way to create a button frame since it isn't possible to set
// the display type in CSS2 to create a button frame.
// create content used for display
// nsAtom* tag = NS_Atomize("mozcombodisplay");
// Add a child text content node for the label
nsNodeInfoManager* nimgr = mContent->NodeInfo()->NodeInfoManager();
mDisplayContent = new (nimgr) nsTextNode(nimgr);
// set the value of the text node
mDisplayedIndex = Select().SelectedIndex();
if (mDisplayedIndex != -1) {
GetOptionText(mDisplayedIndex, mDisplayedOptionTextOrPreview);
}
ActuallyDisplayText(false);
// XXX(Bug 1631371) Check if this should use a fallible operation as it
// pretended earlier.
aElements.AppendElement(mDisplayContent);
mButtonContent = mContent->OwnerDoc()->CreateHTMLElement(nsGkAtoms::button);
if (!mButtonContent) return NS_ERROR_OUT_OF_MEMORY;
// make someone to listen to the button.
mButtonContent->SetAttr(kNameSpaceID_None, nsGkAtoms::type, u"button"_ns,
false);
// Set tabindex="-1" so that the button is not tabbable
mButtonContent->SetAttr(kNameSpaceID_None, nsGkAtoms::tabindex, u"-1"_ns,
false);
WritingMode wm = GetWritingMode();
if (wm.IsVertical()) {
mButtonContent->SetAttr(kNameSpaceID_None, nsGkAtoms::orientation,
wm.IsVerticalRL() ? u"left"_ns : u"right"_ns,
false);
}
// XXX(Bug 1631371) Check if this should use a fallible operation as it
// pretended earlier.
aElements.AppendElement(mButtonContent);
return NS_OK;
}
void nsComboboxControlFrame::AppendAnonymousContentTo(
nsTArray<nsIContent*>& aElements, uint32_t aFilter) {
if (mDisplayContent) {
aElements.AppendElement(mDisplayContent);
}
if (mButtonContent) {
aElements.AppendElement(mButtonContent);
}
}
nsIContent* nsComboboxControlFrame::GetDisplayNode() const {
return mDisplayContent;
}
// XXXbz this is a for-now hack. Now that display:inline-block works,
// need to revisit this.
class nsComboboxDisplayFrame final : public nsBlockFrame {
public:
NS_DECL_FRAMEARENA_HELPERS(nsComboboxDisplayFrame)
nsComboboxDisplayFrame(ComputedStyle* aStyle,
nsComboboxControlFrame* aComboBox)
: nsBlockFrame(aStyle, aComboBox->PresContext(), kClassID),
mComboBox(aComboBox) {}
#ifdef DEBUG_FRAME_DUMP
nsresult GetFrameName(nsAString& aResult) const final {
return MakeFrameName(u"ComboboxDisplay"_ns, aResult);
}
#endif
bool IsFrameOfType(uint32_t aFlags) const final {
return nsBlockFrame::IsFrameOfType(aFlags &
~(nsIFrame::eReplacedContainsBlock));
}
void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput, nsReflowStatus& aStatus) final;
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) final;
protected:
nsComboboxControlFrame* mComboBox;
};
NS_IMPL_FRAMEARENA_HELPERS(nsComboboxDisplayFrame)
void nsComboboxDisplayFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
MOZ_ASSERT(aReflowInput.mParentReflowInput &&
aReflowInput.mParentReflowInput->mFrame == mComboBox,
"Combobox's frame tree is wrong!");
ReflowInput state(aReflowInput);
if (state.ComputedBSize() == NS_UNCONSTRAINEDSIZE) {
state.SetLineHeight(state.mParentReflowInput->GetLineHeight());
}
const WritingMode wm = aReflowInput.GetWritingMode();
const LogicalMargin bp = state.ComputedLogicalBorderPadding(wm);
MOZ_ASSERT(bp.BStartEnd(wm) == 0,
"We shouldn't have border and padding in the block axis in UA!");
nscoord inlineBp = bp.IStartEnd(wm);
nscoord computedISize = mComboBox->mDisplayISize - inlineBp;
// Other UAs ignore padding in some (but not all) platforms for (themed only)
// comboboxes. Instead of doing that, we prevent that padding if present from
// clipping the display text, by enforcing the display text minimum size in
// that situation.
const bool shouldHonorMinISize =
mComboBox->StyleDisplay()->EffectiveAppearance() ==
StyleAppearance::Menulist;
if (shouldHonorMinISize) {
computedISize = std::max(state.ComputedMinISize(), computedISize);
// Don't let this size go over mMaxDisplayISize, since that'd be
// observable via clientWidth / scrollWidth.
computedISize =
std::min(computedISize, mComboBox->mMaxDisplayISize - inlineBp);
}
state.SetComputedISize(std::max(0, computedISize));
nsBlockFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
aStatus.Reset(); // this type of frame can't be split
}
void nsComboboxDisplayFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
nsDisplayListCollection set(aBuilder);
nsBlockFrame::BuildDisplayList(aBuilder, set);
// remove background items if parent frame is themed
if (mComboBox->IsThemed()) {
set.BorderBackground()->DeleteAll(aBuilder);
}
set.MoveTo(aLists);
}
nsIFrame* nsComboboxControlFrame::CreateFrameForDisplayNode() {
MOZ_ASSERT(mDisplayContent);
// Get PresShell
mozilla::PresShell* ps = PresShell();
ServoStyleSet* styleSet = ps->StyleSet();
// create the ComputedStyle for the anonymous block frame and text frame
RefPtr<ComputedStyle> computedStyle =
styleSet->ResolveInheritingAnonymousBoxStyle(
PseudoStyleType::mozDisplayComboboxControlFrame, mComputedStyle);
RefPtr<ComputedStyle> textComputedStyle =
styleSet->ResolveStyleForText(mDisplayContent, mComputedStyle);
// Start by creating our anonymous block frame
mDisplayFrame = new (ps) nsComboboxDisplayFrame(computedStyle, this);
mDisplayFrame->Init(mContent, this, nullptr);
// Create a text frame and put it inside the block frame
nsIFrame* textFrame = NS_NewTextFrame(ps, textComputedStyle);
// initialize the text frame
textFrame->Init(mDisplayContent, mDisplayFrame, nullptr);
mDisplayContent->SetPrimaryFrame(textFrame);
nsFrameList textList(textFrame, textFrame);
mDisplayFrame->SetInitialChildList(kPrincipalList, textList);
return mDisplayFrame;
}
void nsComboboxControlFrame::DestroyFrom(nsIFrame* aDestructRoot,
PostDestroyData& aPostDestroyData) {
// Revoke any pending RedisplayTextEvent
mRedisplayTextEvent.Revoke();
mEventListener->Detach();
// Cleanup frames in popup child list
mPopupFrames.DestroyFramesFrom(aDestructRoot, aPostDestroyData);
aPostDestroyData.AddAnonymousContent(mDisplayContent.forget());
aPostDestroyData.AddAnonymousContent(mButtonContent.forget());
nsBlockFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
}
const nsFrameList& nsComboboxControlFrame::GetChildList(
ChildListID aListID) const {
if (kSelectPopupList == aListID) {
return mPopupFrames;
}
return nsBlockFrame::GetChildList(aListID);
}
void nsComboboxControlFrame::GetChildLists(nsTArray<ChildList>* aLists) const {
nsBlockFrame::GetChildLists(aLists);
mPopupFrames.AppendIfNonempty(aLists, kSelectPopupList);
}
void nsComboboxControlFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList) {
#ifdef DEBUG
for (nsIFrame* f : aChildList) {
MOZ_ASSERT(f->GetParent() == this, "Unexpected parent");
}
#endif
if (kSelectPopupList == aListID) {
mPopupFrames.SetFrames(aChildList);
} else {
for (nsFrameList::Enumerator e(aChildList); !e.AtEnd(); e.Next()) {
nsCOMPtr<nsIFormControl> formControl =
do_QueryInterface(e.get()->GetContent());
if (formControl &&
formControl->ControlType() == FormControlType::ButtonButton) {
mButtonFrame = e.get();
break;
}
}
NS_ASSERTION(mButtonFrame, "missing button frame in initial child list");
nsBlockFrame::SetInitialChildList(aListID, aChildList);
}
}
namespace mozilla {
class nsDisplayComboboxFocus : public nsPaintedDisplayItem {
public:
nsDisplayComboboxFocus(nsDisplayListBuilder* aBuilder,
nsComboboxControlFrame* aFrame)
: nsPaintedDisplayItem(aBuilder, aFrame) {
MOZ_COUNT_CTOR(nsDisplayComboboxFocus);
}
MOZ_COUNTED_DTOR_OVERRIDE(nsDisplayComboboxFocus)
void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override;
NS_DISPLAY_DECL_NAME("ComboboxFocus", TYPE_COMBOBOX_FOCUS)
};
void nsDisplayComboboxFocus::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
static_cast<nsComboboxControlFrame*>(mFrame)->PaintFocus(
*aCtx->GetDrawTarget(), ToReferenceFrame());
}
} // namespace mozilla
void nsComboboxControlFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
if (aBuilder->IsForEventDelivery()) {
// Don't allow children to receive events.
// REVIEW: following old GetFrameForPoint
DisplayBorderBackgroundOutline(aBuilder, aLists);
} else {
// REVIEW: Our in-flow child frames are inline-level so they will paint in
// our content list, so we don't need to mess with layers.
nsBlockFrame::BuildDisplayList(aBuilder, aLists);
}
// draw a focus indicator only when focus rings should be drawn
if (mContent->AsElement()->State().HasState(NS_EVENT_STATE_FOCUSRING)) {
nsPresContext* pc = PresContext();
const nsStyleDisplay* disp = StyleDisplay();
if (IsThemed(disp) &&
pc->Theme()->ThemeWantsButtonInnerFocusRing(
this, disp->EffectiveAppearance()) &&
mDisplayFrame && IsVisibleForPainting()) {
aLists.Content()->AppendNewToTop<nsDisplayComboboxFocus>(aBuilder, this);
}
}
DisplaySelectionOverlay(aBuilder, aLists.Content());
}
void nsComboboxControlFrame::PaintFocus(DrawTarget& aDrawTarget, nsPoint aPt) {
/* Do we need to do anything? */
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED) ||
!eventStates.HasState(NS_EVENT_STATE_FOCUS)) {
return;
}
int32_t appUnitsPerDevPixel = PresContext()->AppUnitsPerDevPixel();
nsRect clipRect = mDisplayFrame->GetRect() + aPt;
aDrawTarget.PushClipRect(
NSRectToSnappedRect(clipRect, appUnitsPerDevPixel, aDrawTarget));
StrokeOptions strokeOptions;
nsLayoutUtils::InitDashPattern(strokeOptions, StyleBorderStyle::Dotted);
ColorPattern color(ToDeviceColor(StyleText()->mColor));
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
clipRect.width -= onePixel;
clipRect.height -= onePixel;
Rect r = ToRect(nsLayoutUtils::RectToGfxRect(clipRect, appUnitsPerDevPixel));
StrokeSnappedEdgesOfRect(r, aDrawTarget, color, strokeOptions);
aDrawTarget.PopClip();
}
//---------------------------------------------------------
// gets the content (an option) by index and then set it as
// being selected or not selected
//---------------------------------------------------------
NS_IMETHODIMP
nsComboboxControlFrame::OnOptionSelected(int32_t aIndex, bool aSelected) {
if (aSelected) {
nsAutoScriptBlocker blocker;
mDisplayedIndex = aIndex;
RedisplayText();
} else {
AutoWeakFrame weakFrame(this);
RedisplaySelectedText();
if (weakFrame.IsAlive()) {
FireValueChangeEvent(); // Fire after old option is unselected
}
}
return NS_OK;
}
void nsComboboxControlFrame::FireValueChangeEvent() {
// Fire ValueChange event to indicate data value of combo box has changed
nsContentUtils::AddScriptRunner(new AsyncEventDispatcher(
mContent, u"ValueChange"_ns, CanBubble::eYes, ChromeOnlyDispatch::eNo));
}
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