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nsFrame.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/. */
/* base class of all rendering objects */
#include "nsFrame.h"
#include <stdarg.h>
#include <algorithm>
#include "gfx2DGlue.h"
#include "gfxUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/ComputedStyle.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/dom/ElementInlines.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/gfxVars.h"
#include "mozilla/gfx/PathHelpers.h"
#include "mozilla/PresShell.h"
#include "mozilla/PresShellInlines.h"
#include "mozilla/Sprintf.h"
#include "mozilla/StaticPrefs_layout.h"
#include "nsCOMPtr.h"
#include "nsFlexContainerFrame.h"
#include "nsFrameList.h"
#include "nsPlaceholderFrame.h"
#include "nsPluginFrame.h"
#include "nsIBaseWindow.h"
#include "nsIContent.h"
#include "nsIContentInlines.h"
#include "nsContentUtils.h"
#include "nsCSSFrameConstructor.h"
#include "nsCSSProps.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSRendering.h"
#include "nsAtom.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsTableWrapperFrame.h"
#include "nsView.h"
#include "nsViewManager.h"
#include "nsIScrollableFrame.h"
#include "nsPresContext.h"
#include "nsPresContextInlines.h"
#include "nsStyleConsts.h"
#include "mozilla/Logging.h"
#include "nsLayoutUtils.h"
#include "LayoutLogging.h"
#include "mozilla/RestyleManager.h"
#include "nsInlineFrame.h"
#include "nsFrameSelection.h"
#include "nsGkAtoms.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSClipPathInstance.h"
#include "nsFrameTraversal.h"
#include "nsRange.h"
#include "nsITextControlFrame.h"
#include "nsNameSpaceManager.h"
#include "nsIPercentBSizeObserver.h"
#include "nsStyleStructInlines.h"
#include "FrameLayerBuilder.h"
#include "ImageLayers.h"
#include "nsBidiPresUtils.h"
#include "RubyUtils.h"
#include "nsAnimationManager.h"
// For triple-click pref
#include "imgIContainer.h"
#include "imgIRequest.h"
#include "nsError.h"
#include "nsContainerFrame.h"
#include "nsBoxLayoutState.h"
#include "nsBlockFrame.h"
#include "nsDisplayList.h"
#include "nsSVGIntegrationUtils.h"
#include "SVGObserverUtils.h"
#include "nsSVGMaskFrame.h"
#include "nsChangeHint.h"
#include "nsDeckFrame.h"
#include "nsSubDocumentFrame.h"
#include "SVGTextFrame.h"
#include "RetainedDisplayListBuilder.h"
#include "gfxContext.h"
#include "nsAbsoluteContainingBlock.h"
#include "StickyScrollContainer.h"
#include "nsFontInflationData.h"
#include "nsRegion.h"
#include "nsIFrameInlines.h"
#include "nsStyleChangeList.h"
#include "nsWindowSizes.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/EffectCompositor.h"
#include "mozilla/EffectSet.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/EventStates.h"
#include "mozilla/Preferences.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/ServoStyleSet.h"
#include "mozilla/ServoStyleSetInlines.h"
#include "mozilla/css/ImageLoader.h"
#include "mozilla/dom/TouchEvent.h"
#include "mozilla/gfx/Tools.h"
#include "mozilla/layers/WebRenderUserData.h"
#include "mozilla/layout/ScrollAnchorContainer.h"
#include "nsPrintfCString.h"
#include "ActiveLayerTracker.h"
#include "nsITheme.h"
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::layers;
using namespace mozilla::layout;
typedef nsAbsoluteContainingBlock::AbsPosReflowFlags AbsPosReflowFlags;
class nsImageFrame;
const mozilla::LayoutFrameType nsIFrame::sLayoutFrameTypes[
#define FRAME_ID(...) 1 +
#define ABSTRACT_FRAME_ID(...)
#include "mozilla/FrameIdList.h"
#undef FRAME_ID
#undef ABSTRACT_FRAME_ID
0] = {
#define FRAME_ID(class_, type_, ...) mozilla::LayoutFrameType::type_,
#define ABSTRACT_FRAME_ID(...)
#include "mozilla/FrameIdList.h"
#undef FRAME_ID
#undef ABSTRACT_FRAME_ID
};
const nsIFrame::FrameClassBits nsIFrame::sFrameClassBits[
#define FRAME_ID(...) 1 +
#define ABSTRACT_FRAME_ID(...)
#include "mozilla/FrameIdList.h"
#undef FRAME_ID
#undef ABSTRACT_FRAME_ID
0] = {
#define Leaf eFrameClassBitsLeaf
#define NotLeaf eFrameClassBitsNone
#define DynamicLeaf eFrameClassBitsDynamicLeaf
#define FRAME_ID(class_, type_, leaf_, ...) leaf_,
#define ABSTRACT_FRAME_ID(...)
#include "mozilla/FrameIdList.h"
#undef Leaf
#undef NotLeaf
#undef DynamicLeaf
#undef FRAME_ID
#undef ABSTRACT_FRAME_ID
};
// Struct containing cached metrics for box-wrapped frames.
struct nsBoxLayoutMetrics {
nsSize mPrefSize;
nsSize mMinSize;
nsSize mMaxSize;
nsSize mBlockMinSize;
nsSize mBlockPrefSize;
nscoord mBlockAscent;
nscoord mFlex;
nscoord mAscent;
nsSize mLastSize;
};
struct nsContentAndOffset {
nsIContent* mContent;
int32_t mOffset;
};
// Some Misc #defines
#define SELECTION_DEBUG 0
#define FORCE_SELECTION_UPDATE 1
#define CALC_DEBUG 0
// This is faster than nsBidiPresUtils::IsFrameInParagraphDirection,
// because it uses the frame pointer passed in without drilling down to
// the leaf frame.
static bool IsReversedDirectionFrame(nsIFrame* aFrame) {
FrameBidiData bidiData = aFrame->GetBidiData();
return !IS_SAME_DIRECTION(bidiData.embeddingLevel, bidiData.baseLevel);
}
#include "nsILineIterator.h"
#include "prenv.h"
NS_DECLARE_FRAME_PROPERTY_DELETABLE(BoxMetricsProperty, nsBoxLayoutMetrics)
static void InitBoxMetrics(nsIFrame* aFrame, bool aClear) {
if (aClear) {
aFrame->DeleteProperty(BoxMetricsProperty());
}
nsBoxLayoutMetrics* metrics = new nsBoxLayoutMetrics();
aFrame->SetProperty(BoxMetricsProperty(), metrics);
static_cast<nsFrame*>(aFrame)->nsFrame::MarkIntrinsicISizesDirty();
metrics->mBlockAscent = 0;
metrics->mLastSize.SizeTo(0, 0);
}
// Utility function to set a nsRect-valued property table entry on aFrame,
// reusing the existing storage if the property happens to be already set.
template <typename T>
static void SetOrUpdateRectValuedProperty(
nsIFrame* aFrame, FrameProperties::Descriptor<T> aProperty,
const nsRect& aNewValue) {
bool found;
nsRect* rectStorage = aFrame->GetProperty(aProperty, &found);
if (!found) {
rectStorage = new nsRect(aNewValue);
aFrame->AddProperty(aProperty, rectStorage);
} else {
*rectStorage = aNewValue;
}
}
static bool IsXULBoxWrapped(const nsIFrame* aFrame) {
return aFrame->GetParent() && aFrame->GetParent()->IsXULBoxFrame() &&
!aFrame->IsXULBoxFrame();
}
void nsReflowStatus::UpdateTruncated(const ReflowInput& aReflowInput,
const ReflowOutput& aMetrics) {
const WritingMode containerWM = aMetrics.GetWritingMode();
if (aReflowInput.GetWritingMode().IsOrthogonalTo(containerWM)) {
// Orthogonal flows are always reflowed with an unconstrained dimension,
// so should never end up truncated (see ReflowInput::Init()).
mTruncated = false;
} else if (aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE &&
aReflowInput.AvailableBSize() < aMetrics.BSize(containerWM) &&
!aReflowInput.mFlags.mIsTopOfPage) {
mTruncated = true;
} else {
mTruncated = false;
}
}
/* static */
void nsIFrame::DestroyAnonymousContent(
nsPresContext* aPresContext, already_AddRefed<nsIContent>&& aContent) {
if (nsCOMPtr<nsIContent> content = aContent) {
aPresContext->EventStateManager()->NativeAnonymousContentRemoved(content);
aPresContext->PresShell()->NativeAnonymousContentRemoved(content);
content->UnbindFromTree();
}
}
// Formerly the nsIFrameDebug interface
std::ostream& operator<<(std::ostream& aStream, const nsReflowStatus& aStatus) {
char complete = 'Y';
if (aStatus.IsIncomplete()) {
complete = 'N';
} else if (aStatus.IsOverflowIncomplete()) {
complete = 'O';
}
char brk = 'N';
if (aStatus.IsInlineBreakBefore()) {
brk = 'B';
} else if (aStatus.IsInlineBreakAfter()) {
brk = 'A';
}
aStream << "["
<< "Complete=" << complete << ","
<< "NIF=" << (aStatus.NextInFlowNeedsReflow() ? 'Y' : 'N') << ","
<< "Truncated=" << (aStatus.IsTruncated() ? 'Y' : 'N') << ","
<< "Break=" << brk << ","
<< "FirstLetter=" << (aStatus.FirstLetterComplete() ? 'Y' : 'N')
<< "]";
return aStream;
}
#ifdef DEBUG
static bool gShowFrameBorders = false;
void nsFrame::ShowFrameBorders(bool aEnable) { gShowFrameBorders = aEnable; }
bool nsFrame::GetShowFrameBorders() { return gShowFrameBorders; }
static bool gShowEventTargetFrameBorder = false;
void nsFrame::ShowEventTargetFrameBorder(bool aEnable) {
gShowEventTargetFrameBorder = aEnable;
}
bool nsFrame::GetShowEventTargetFrameBorder() {
return gShowEventTargetFrameBorder;
}
/**
* Note: the log module is created during library initialization which
* means that you cannot perform logging before then.
*/
mozilla::LazyLogModule nsFrame::sFrameLogModule("frame");
#endif
NS_DECLARE_FRAME_PROPERTY_DELETABLE(AbsoluteContainingBlockProperty,
nsAbsoluteContainingBlock)
bool nsIFrame::HasAbsolutelyPositionedChildren() const {
return IsAbsoluteContainer() &&
GetAbsoluteContainingBlock()->HasAbsoluteFrames();
}
nsAbsoluteContainingBlock* nsIFrame::GetAbsoluteContainingBlock() const {
NS_ASSERTION(IsAbsoluteContainer(),
"The frame is not marked as an abspos container correctly");
nsAbsoluteContainingBlock* absCB =
GetProperty(AbsoluteContainingBlockProperty());
NS_ASSERTION(absCB,
"The frame is marked as an abspos container but doesn't have "
"the property");
return absCB;
}
void nsIFrame::MarkAsAbsoluteContainingBlock() {
MOZ_ASSERT(GetStateBits() & NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN);
NS_ASSERTION(!GetProperty(AbsoluteContainingBlockProperty()),
"Already has an abs-pos containing block property?");
NS_ASSERTION(!HasAnyStateBits(NS_FRAME_HAS_ABSPOS_CHILDREN),
"Already has NS_FRAME_HAS_ABSPOS_CHILDREN state bit?");
AddStateBits(NS_FRAME_HAS_ABSPOS_CHILDREN);
SetProperty(AbsoluteContainingBlockProperty(),
new nsAbsoluteContainingBlock(GetAbsoluteListID()));
}
void nsIFrame::MarkAsNotAbsoluteContainingBlock() {
NS_ASSERTION(!HasAbsolutelyPositionedChildren(), "Think of the children!");
NS_ASSERTION(GetProperty(AbsoluteContainingBlockProperty()),
"Should have an abs-pos containing block property");
NS_ASSERTION(HasAnyStateBits(NS_FRAME_HAS_ABSPOS_CHILDREN),
"Should have NS_FRAME_HAS_ABSPOS_CHILDREN state bit");
MOZ_ASSERT(HasAnyStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN));
RemoveStateBits(NS_FRAME_HAS_ABSPOS_CHILDREN);
DeleteProperty(AbsoluteContainingBlockProperty());
}
bool nsIFrame::CheckAndClearPaintedState() {
bool result = (GetStateBits() & NS_FRAME_PAINTED_THEBES);
RemoveStateBits(NS_FRAME_PAINTED_THEBES);
nsIFrame::ChildListIterator lists(this);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* child = childFrames.get();
if (child->CheckAndClearPaintedState()) {
result = true;
}
}
}
return result;
}
bool nsIFrame::CheckAndClearDisplayListState() {
bool result = BuiltDisplayList();
SetBuiltDisplayList(false);
nsIFrame::ChildListIterator lists(this);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* child = childFrames.get();
if (child->CheckAndClearDisplayListState()) {
result = true;
}
}
}
return result;
}
bool nsIFrame::IsVisibleConsideringAncestors(uint32_t aFlags) const {
if (!StyleVisibility()->IsVisible()) {
return false;
}
if (PresShell()->IsUnderHiddenEmbedderElement()) {
return false;
}
const nsIFrame* frame = this;
while (frame) {
nsView* view = frame->GetView();
if (view && view->GetVisibility() == nsViewVisibility_kHide) return false;
nsIFrame* parent = frame->GetParent();
nsDeckFrame* deck = do_QueryFrame(parent);
if (deck) {
if (deck->GetSelectedBox() != frame) return false;
}
if (parent) {
frame = parent;
} else {
parent = nsLayoutUtils::GetCrossDocParentFrame(frame);
if (!parent) break;
if ((aFlags & nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY) == 0 &&
parent->PresContext()->IsChrome() &&
!frame->PresContext()->IsChrome()) {
break;
}
frame = parent;
}
}
return true;
}
void nsIFrame::FindCloserFrameForSelection(
const nsPoint& aPoint, FrameWithDistance* aCurrentBestFrame) {
if (nsLayoutUtils::PointIsCloserToRect(aPoint, mRect,
aCurrentBestFrame->mXDistance,
aCurrentBestFrame->mYDistance)) {
aCurrentBestFrame->mFrame = this;
}
}
void nsIFrame::ContentStatesChanged(mozilla::EventStates aStates) {}
AutoWeakFrame::AutoWeakFrame(const WeakFrame& aOther)
: mPrev(nullptr), mFrame(nullptr) {
Init(aOther.GetFrame());
}
void AutoWeakFrame::Init(nsIFrame* aFrame) {
Clear(mFrame ? mFrame->PresContext()->GetPresShell() : nullptr);
mFrame = aFrame;
if (mFrame) {
mozilla::PresShell* presShell = mFrame->PresContext()->GetPresShell();
NS_WARNING_ASSERTION(presShell, "Null PresShell in AutoWeakFrame!");
if (presShell) {
presShell->AddAutoWeakFrame(this);
} else {
mFrame = nullptr;
}
}
}
void WeakFrame::Init(nsIFrame* aFrame) {
Clear(mFrame ? mFrame->PresContext()->GetPresShell() : nullptr);
mFrame = aFrame;
if (mFrame) {
mozilla::PresShell* presShell = mFrame->PresContext()->GetPresShell();
MOZ_ASSERT(presShell, "Null PresShell in WeakFrame!");
if (presShell) {
presShell->AddWeakFrame(this);
} else {
mFrame = nullptr;
}
}
}
nsIFrame* NS_NewEmptyFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
return new (aPresShell) nsFrame(aStyle, aPresShell->GetPresContext());
}
nsFrame::nsFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
ClassID aID)
: nsBox(aStyle, aPresContext, aID) {
MOZ_COUNT_CTOR(nsFrame);
}
nsFrame::~nsFrame() {
MOZ_COUNT_DTOR(nsFrame);
MOZ_ASSERT(GetVisibility() != Visibility::ApproximatelyVisible,
"Visible nsFrame is being destroyed");
}
NS_IMPL_FRAMEARENA_HELPERS(nsFrame)
// Dummy operator delete. Will never be called, but must be defined
// to satisfy some C++ ABIs.
void nsFrame::operator delete(void*, size_t) {
MOZ_CRASH("nsFrame::operator delete should never be called");
}
NS_QUERYFRAME_HEAD(nsFrame)
NS_QUERYFRAME_ENTRY(nsIFrame)
NS_QUERYFRAME_TAIL_INHERITANCE_ROOT
/////////////////////////////////////////////////////////////////////////////
// nsIFrame
static bool IsFontSizeInflationContainer(nsIFrame* aFrame,
const nsStyleDisplay* aStyleDisplay) {
/*
* Font size inflation is built around the idea that we're inflating
* the fonts for a pan-and-zoom UI so that when the user scales up a
* block or other container to fill the width of the device, the fonts
* will be readable. To do this, we need to pick what counts as a
* container.
*
* From a code perspective, the only hard requirement is that frames
* that are line participants
* (nsIFrame::IsFrameOfType(nsIFrame::eLineParticipant)) are never
* containers, since line layout assumes that the inflation is
* consistent within a line.
*
* This is not an imposition, since we obviously want a bunch of text
* (possibly with inline elements) flowing within a block to count the
* block (or higher) as its container.
*
* We also want form controls, including the text in the anonymous
* content inside of them, to match each other and the text next to
* them, so they and their anonymous content should also not be a
* container.
*
* However, because we can't reliably compute sizes across XUL during
* reflow, any XUL frame with a XUL parent is always a container.
*
* There are contexts where it would be nice if some blocks didn't
* count as a container, so that, for example, an indented quotation
* didn't end up with a smaller font size. However, it's hard to
* distinguish these situations where we really do want the indented
* thing to count as a container, so we don't try, and blocks are
* always containers.
*/
// The root frame should always be an inflation container.
if (!aFrame->GetParent()) {
return true;
}
nsIContent* content = aFrame->GetContent();
LayoutFrameType frameType = aFrame->Type();
bool isInline =
(nsStyleDisplay::DisplayInside(aFrame->GetDisplay()) ==
StyleDisplayInside::Inline ||
RubyUtils::IsRubyBox(frameType) ||
(aFrame->IsFloating() && frameType == LayoutFrameType::Letter) ||
// Given multiple frames for the same node, only the
// outer one should be considered a container.
// (Important, e.g., for nsSelectsAreaFrame.)
(aFrame->GetParent()->GetContent() == content) ||
(content &&
(content->IsAnyOfHTMLElements(nsGkAtoms::option, nsGkAtoms::optgroup,
nsGkAtoms::select) ||
content->IsInNativeAnonymousSubtree()))) &&
!(aFrame->IsXULBoxFrame() && aFrame->GetParent()->IsXULBoxFrame());
NS_ASSERTION(!aFrame->IsFrameOfType(nsIFrame::eLineParticipant) || isInline ||
// br frames and mathml frames report being line
// participants even when their position or display is
// set
aFrame->IsBrFrame() ||
aFrame->IsFrameOfType(nsIFrame::eMathML),
"line participants must not be containers");
NS_ASSERTION(!aFrame->IsBulletFrame() || isInline,
"bullets should not be containers");
return !isInline;
}
static void MaybeScheduleReflowSVGNonDisplayText(nsFrame* aFrame) {
if (!nsSVGUtils::IsInSVGTextSubtree(aFrame)) {
return;
}
// We need to ensure that any non-display SVGTextFrames get reflowed when a
// child text frame gets new style. Thus we need to schedule a reflow in
// |DidSetComputedStyle|. We also need to call it from |DestroyFrom|,
// because otherwise we won't get notified when style changes to
// "display:none".
SVGTextFrame* svgTextFrame = static_cast<SVGTextFrame*>(
nsLayoutUtils::GetClosestFrameOfType(aFrame, LayoutFrameType::SVGText));
nsIFrame* anonBlock = svgTextFrame->PrincipalChildList().FirstChild();
// Note that we must check NS_FRAME_FIRST_REFLOW on our SVGTextFrame's
// anonymous block frame rather than our aFrame, since NS_FRAME_FIRST_REFLOW
// may be set on us if we're a new frame that has been inserted after the
// document's first reflow. (In which case this DidSetComputedStyle call may
// be happening under frame construction under a Reflow() call.)
if (!anonBlock || anonBlock->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
return;
}
if (!svgTextFrame->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY) ||
svgTextFrame->HasAnyStateBits(NS_STATE_SVG_TEXT_IN_REFLOW)) {
return;
}
svgTextFrame->ScheduleReflowSVGNonDisplayText(IntrinsicDirty::StyleChange);
}
void nsFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
MOZ_ASSERT(nsQueryFrame::FrameIID(mClass) == GetFrameId());
MOZ_ASSERT(!mContent, "Double-initing a frame?");
NS_ASSERTION(IsFrameOfType(eDEBUGAllFrames) && !IsFrameOfType(eDEBUGNoFrames),
"IsFrameOfType implementation that doesn't call base class");
mContent = aContent;
mParent = aParent;
MOZ_DIAGNOSTIC_ASSERT(!mParent || PresShell() == mParent->PresShell());
if (aPrevInFlow) {
mWritingMode = aPrevInFlow->GetWritingMode();
// Copy some state bits from prev-in-flow (the bits that should apply
// throughout a continuation chain). The bits are sorted according to their
// order in nsFrameStateBits.h.
// clang-format off
AddStateBits(aPrevInFlow->GetStateBits() &
(NS_FRAME_ANONYMOUSCONTENTCREATOR_CONTENT |
NS_FRAME_GENERATED_CONTENT |
NS_FRAME_OUT_OF_FLOW |
NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN |
NS_FRAME_INDEPENDENT_SELECTION |
NS_FRAME_PART_OF_IBSPLIT |
NS_FRAME_MAY_BE_TRANSFORMED |
NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR));
// clang-format on
// Copy other bits in nsIFrame from prev-in-flow.
mHasColumnSpanSiblings = aPrevInFlow->HasColumnSpanSiblings();
} else {
PresContext()->ConstructedFrame();
}
if (GetParent()) {
// Copy some state bits from our parent (the bits that should apply
// recursively throughout a subtree). The bits are sorted according to their
// order in nsFrameStateBits.h.
// clang-format off
AddStateBits(GetParent()->GetStateBits() &
(NS_FRAME_GENERATED_CONTENT |
NS_FRAME_INDEPENDENT_SELECTION |
NS_FRAME_IS_SVG_TEXT |
NS_FRAME_IN_POPUP |
NS_FRAME_IS_NONDISPLAY));
// clang-format on
if (HasAnyStateBits(NS_FRAME_IN_POPUP) && TrackingVisibility()) {
// Assume all frames in popups are visible.
IncApproximateVisibleCount();
}
}
if (aPrevInFlow) {
mMayHaveOpacityAnimation = aPrevInFlow->MayHaveOpacityAnimation();
mMayHaveTransformAnimation = aPrevInFlow->MayHaveTransformAnimation();
} else if (mContent) {
// It's fine to fetch the EffectSet for the style frame here because in the
// following code we take care of the case where animations may target
// a different frame.
EffectSet* effectSet = EffectSet::GetEffectSetForStyleFrame(this);
if (effectSet) {
mMayHaveOpacityAnimation = effectSet->MayHaveOpacityAnimation();
if (effectSet->MayHaveTransformAnimation()) {
// If we are the inner table frame for display:table content, then
// transform animations should go on our parent frame (the table wrapper
// frame).
//
// We do this when initializing the child frame (table inner frame),
// because when initializng the table wrapper frame, we don't yet have
// access to its children so we can't tell if we have transform
// animations or not.
if (IsFrameOfType(eSupportsCSSTransforms)) {
mMayHaveTransformAnimation = true;
AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED);
} else if (aParent && nsLayoutUtils::GetStyleFrame(aParent) == this) {
MOZ_ASSERT(
aParent->IsFrameOfType(eSupportsCSSTransforms),
"Style frames that don't support transforms should have parents"
" that do");
aParent->mMayHaveTransformAnimation = true;
aParent->AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED);
}
}
}
}
const nsStyleDisplay* disp = StyleDisplay();
if (disp->HasTransform(this)) {
// The frame gets reconstructed if we toggle the transform
// property, so we can set this bit here and then ignore it.
AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED);
}
if (disp->mPosition == NS_STYLE_POSITION_STICKY && !aPrevInFlow &&
!(mState & NS_FRAME_IS_NONDISPLAY)) {
// Note that we only add first continuations, but we really only
// want to add first continuation-or-ib-split-siblings. But since we
// don't yet know if we're a later part of a block-in-inline split,
// we'll just add later members of a block-in-inline split here, and
// then StickyScrollContainer will remove them later.
StickyScrollContainer* ssc =
StickyScrollContainer::GetStickyScrollContainerForFrame(this);
if (ssc) {
ssc->AddFrame(this);
}
}
if (disp->IsContainLayout() && disp->IsContainSize() &&
// All frames that support contain:layout also support contain:size.
IsFrameOfType(eSupportsContainLayoutAndPaint) && !IsTableWrapperFrame()) {
// In general, frames that have contain:layout+size can be reflow roots.
// (One exception: table-wrapper frames don't work well as reflow roots,
// because their inner-table ReflowInput init path tries to reuse & deref
// the wrapper's containing block reflow input, which may be null if we
// initiate reflow from the table-wrapper itself.)
//
// Changes to `contain` force frame reconstructions, so this bit can be set
// for the whole lifetime of this frame.
AddStateBits(NS_FRAME_REFLOW_ROOT);
}
if (nsLayoutUtils::FontSizeInflationEnabled(PresContext()) ||
!GetParent()
#ifdef DEBUG
// We have assertions that check inflation invariants even when
// font size inflation is not enabled.
|| true
#endif
) {
if (IsFontSizeInflationContainer(this, disp)) {
AddStateBits(NS_FRAME_FONT_INFLATION_CONTAINER);
if (!GetParent() ||
// I'd use NS_FRAME_OUT_OF_FLOW, but it's not set yet.
disp->IsFloating(this) || disp->IsAbsolutelyPositioned(this) ||
GetParent()->IsFlexContainerFrame() ||
GetParent()->IsGridContainerFrame()) {
AddStateBits(NS_FRAME_FONT_INFLATION_FLOW_ROOT);
}
}
NS_ASSERTION(
GetParent() || (GetStateBits() & NS_FRAME_FONT_INFLATION_CONTAINER),
"root frame should always be a container");
}
if (PresShell()->AssumeAllFramesVisible() && TrackingVisibility()) {
IncApproximateVisibleCount();
}
DidSetComputedStyle(nullptr);
if (::IsXULBoxWrapped(this)) ::InitBoxMetrics(this, false);
// For a newly created frame, we need to update this frame's visibility state.
// Usually we update the state when the frame is restyled and has a
// VisibilityChange change hint but we don't generate any change hints for
// newly created frames.
// Note: We don't need to do this for placeholders since placeholders have
// different styles so that the styles don't have visibility:hidden even if
// the parent has visibility:hidden style. We also don't need to update the
// state when creating continuations because its visibility is the same as its
// prev-in-flow, and the animation code cares only primary frames.
if (!IsPlaceholderFrame() && !aPrevInFlow) {
UpdateVisibleDescendantsState();
}
}
void nsFrame::DestroyFrom(nsIFrame* aDestructRoot,
PostDestroyData& aPostDestroyData) {
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"destroy called on frame while scripts not blocked");
NS_ASSERTION(!GetNextSibling() && !GetPrevSibling(),
"Frames should be removed before destruction.");
NS_ASSERTION(aDestructRoot, "Must specify destruct root");
MOZ_ASSERT(!HasAbsolutelyPositionedChildren());
MOZ_ASSERT(!HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT),
"NS_FRAME_PART_OF_IBSPLIT set on non-nsContainerFrame?");
MaybeScheduleReflowSVGNonDisplayText(this);
SVGObserverUtils::InvalidateDirectRenderingObservers(this);
if (StyleDisplay()->mPosition == NS_STYLE_POSITION_STICKY) {
StickyScrollContainer* ssc =
StickyScrollContainer::GetStickyScrollContainerForFrame(this);
if (ssc) {
ssc->RemoveFrame(this);
}
}
nsPresContext* presContext = PresContext();
mozilla::PresShell* presShell = presContext->GetPresShell();
if (mState & NS_FRAME_OUT_OF_FLOW) {
nsPlaceholderFrame* placeholder = GetPlaceholderFrame();
NS_ASSERTION(
!placeholder || (aDestructRoot != this),
"Don't call Destroy() on OOFs, call Destroy() on the placeholder.");
NS_ASSERTION(!placeholder || nsLayoutUtils::IsProperAncestorFrame(
aDestructRoot, placeholder),
"Placeholder relationship should have been torn down already; "
"this might mean we have a stray placeholder in the tree.");
if (placeholder) {
placeholder->SetOutOfFlowFrame(nullptr);
}
}
if (IsPrimaryFrame()) {
// This needs to happen before we clear our Properties() table.
ActiveLayerTracker::TransferActivityToContent(this, mContent);
}
ScrollAnchorContainer* anchor = nullptr;
if (IsScrollAnchor(&anchor)) {
anchor->InvalidateAnchor();
}
if (HasCSSAnimations() || HasCSSTransitions() ||
// It's fine to look up the style frame here since if we're destroying the
// frames for display:table content we should be destroying both wrapper
// and inner frame.
EffectSet::GetEffectSetForStyleFrame(this)) {
// If no new frame for this element is created by the end of the
// restyling process, stop animations and transitions for this frame
RestyleManager::AnimationsWithDestroyedFrame* adf =
presContext->RestyleManager()->GetAnimationsWithDestroyedFrame();
// AnimationsWithDestroyedFrame only lives during the restyling process.
if (adf) {
adf->Put(mContent, mComputedStyle);
}
}
// Disable visibility tracking. Note that we have to do this before we clear
// frame properties and lose track of whether we were previously visible.
// XXX(seth): It'd be ideal to assert that we're already marked nonvisible
// here, but it's unfortunately tricky to guarantee in the face of things like
// frame reconstruction induced by style changes.
DisableVisibilityTracking();
// Ensure that we're not in the approximately visible list anymore.
PresContext()->GetPresShell()->RemoveFrameFromApproximatelyVisibleList(this);
presShell->NotifyDestroyingFrame(this);
if (mState & NS_FRAME_EXTERNAL_REFERENCE) {
presShell->ClearFrameRefs(this);
}
nsView* view = GetView();
if (view) {
view->SetFrame(nullptr);
view->Destroy();
}
// Make sure that our deleted frame can't be returned from GetPrimaryFrame()
if (IsPrimaryFrame()) {
mContent->SetPrimaryFrame(nullptr);
// Pass the root of a generated content subtree (e.g. ::after/::before) to
// aPostDestroyData to unbind it after frame destruction is done.
if (HasAnyStateBits(NS_FRAME_GENERATED_CONTENT) &&
mContent->IsRootOfNativeAnonymousSubtree()) {
aPostDestroyData.AddAnonymousContent(mContent.forget());
}
}
// Delete all properties attached to the frame, to ensure any property
// destructors that need the frame pointer are handled properly.
DeleteAllProperties();
// Must retrieve the object ID before calling destructors, so the
// vtable is still valid.
//
// Note to future tweakers: having the method that returns the
// object size call the destructor will not avoid an indirect call;
// the compiler cannot devirtualize the call to the destructor even
// if it's from a method defined in the same class.
nsQueryFrame::FrameIID id = GetFrameId();
this->~nsFrame();
#ifdef DEBUG
{
nsIFrame* rootFrame = presShell->GetRootFrame();
MOZ_ASSERT(rootFrame);
if (this != rootFrame) {
const RetainedDisplayListData* data =
GetRetainedDisplayListData(rootFrame);
const bool inModifiedList =
data && (data->GetFlags(this) &
RetainedDisplayListData::FrameFlags::Modified);
MOZ_ASSERT(!inModifiedList,
"A dtor added this frame to modified frames list!");
}
}
#endif
// Now that we're totally cleaned out, we need to add ourselves to
// the presshell's recycler.
presShell->FreeFrame(id, this);
}
nsresult nsFrame::GetOffsets(int32_t& aStart, int32_t& aEnd) const {
aStart = 0;
aEnd = 0;
return NS_OK;
}
static void CompareLayers(
const nsStyleImageLayers* aFirstLayers,
const nsStyleImageLayers* aSecondLayers,
const std::function<void(imgRequestProxy* aReq)>& aCallback) {
NS_FOR_VISIBLE_IMAGE_LAYERS_BACK_TO_FRONT(i, (*aFirstLayers)) {
const nsStyleImage& image = aFirstLayers->mLayers[i].mImage;
if (image.GetType() != eStyleImageType_Image || !image.IsResolved()) {
continue;
}
// aCallback is called when the style image in aFirstLayers is thought to
// be different with the corresponded one in aSecondLayers
if (!aSecondLayers || i >= aSecondLayers->mImageCount ||
(!aSecondLayers->mLayers[i].mImage.IsResolved() ||
!image.ImageDataEquals(aSecondLayers->mLayers[i].mImage))) {
if (imgRequestProxy* req = image.GetImageData()) {
aCallback(req);
}
}
}
}
static void AddAndRemoveImageAssociations(
ImageLoader& aImageLoader, nsFrame* aFrame,
const nsStyleImageLayers* aOldLayers,
const nsStyleImageLayers* aNewLayers) {
// If the old context had a background-image image, or mask-image image,
// and new context does not have the same image, clear the image load
// notifier (which keeps the image loading, if it still is) for the frame.
// We want to do this conservatively because some frames paint their
// backgrounds from some other frame's style data, and we don't want
// to clear those notifiers unless we have to. (They'll be reset
// when we paint, although we could miss a notification in that
// interval.)
if (aOldLayers && aFrame->HasImageRequest()) {
CompareLayers(aOldLayers, aNewLayers, [&](imgRequestProxy* aReq) {
aImageLoader.DisassociateRequestFromFrame(aReq, aFrame);
});
}
CompareLayers(aNewLayers, aOldLayers, [&](imgRequestProxy* aReq) {
aImageLoader.AssociateRequestToFrame(aReq, aFrame, 0);
});
}
void nsIFrame::AddDisplayItem(nsDisplayItemBase* aItem) {
DisplayItemArray* items = GetProperty(DisplayItems());
if (!items) {
items = new DisplayItemArray();
AddProperty(DisplayItems(), items);
}
MOZ_DIAGNOSTIC_ASSERT(!items->Contains(aItem));
items->AppendElement(aItem);
}
bool nsIFrame::RemoveDisplayItem(nsDisplayItemBase* aItem) {
DisplayItemArray* items = GetProperty(DisplayItems());
if (!items) {
return false;
}
bool result = items->RemoveElement(aItem);
if (items->IsEmpty()) {
DeleteProperty(DisplayItems());
}
return result;
}
bool nsIFrame::HasDisplayItems() {
DisplayItemArray* items = GetProperty(DisplayItems());
return items != nullptr;
}
bool nsIFrame::HasDisplayItem(nsDisplayItemBase* aItem) {
DisplayItemArray* items = GetProperty(DisplayItems());
if (!items) {
return false;
}
return items->Contains(aItem);
}
bool nsIFrame::HasDisplayItem(uint32_t aKey) {
DisplayItemArray* items = GetProperty(DisplayItems());
if (!items) {
return false;
}