/* -*- 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/Sprintf.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 "nsStyleConsts.h"
#include "nsIPresShell.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 "gfxPrefs.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 "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;
const mozilla::LayoutFrameType nsIFrame::sLayoutFrameTypes[
#define FRAME_ID(...) 1 +
#define ABSTRACT_FRAME_ID(...)
#include "nsFrameIdList.h"
#undef FRAME_ID
#undef ABSTRACT_FRAME_ID
0] = {
#define FRAME_ID(class_, type_, ...) mozilla::LayoutFrameType::type_,
#define ABSTRACT_FRAME_ID(...)
#include "nsFrameIdList.h"
#undef FRAME_ID
#undef ABSTRACT_FRAME_ID
};
const nsIFrame::FrameClassBits nsIFrame::sFrameClassBits[
#define FRAME_ID(...) 1 +
#define ABSTRACT_FRAME_ID(...)
#include "nsFrameIdList.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 "nsFrameIdList.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;
}
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;
}
if (!parent->StyleVisibility()->IsVisible()) return false;
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) {
nsIPresShell* shell = mFrame->PresContext()->GetPresShell();
NS_WARNING_ASSERTION(shell, "Null PresShell in AutoWeakFrame!");
if (shell) {
shell->AddAutoWeakFrame(this);
} else {
mFrame = nullptr;
}
}
}
void WeakFrame::Init(nsIFrame* aFrame) {
Clear(mFrame ? mFrame->PresContext()->GetPresShell() : nullptr);
mFrame = aFrame;
if (mFrame) {
nsIPresShell* shell = mFrame->PresContext()->GetPresShell();
MOZ_ASSERT(shell, "Null PresShell in WeakFrame!");
if (shell) {
shell->AddWeakFrame(this);
} else {
mFrame = nullptr;
}
}
}
nsIFrame* NS_NewEmptyFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle) {
return new (aPresShell) nsFrame(aStyle);
}
nsFrame::nsFrame(ComputedStyle* aStyle, ClassID aID) : nsBox(aID) {
MOZ_COUNT_CTOR(nsFrame);
mComputedStyle = aStyle;
mWritingMode = WritingMode(mComputedStyle);
}
nsFrame::~nsFrame() {
MOZ_COUNT_DTOR(nsFrame);
MOZ_ASSERT(GetVisibility() != Visibility::APPROXIMATELY_VISIBLE,
"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 =
(aFrame->GetDisplay() == StyleDisplay::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;
}
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();
// Make sure the general flags bits are the same
nsFrameState state = aPrevInFlow->GetStateBits();
// Make bits that are currently off (see constructor) the same:
AddStateBits(state &
(NS_FRAME_INDEPENDENT_SELECTION | NS_FRAME_PART_OF_IBSPLIT |
NS_FRAME_MAY_BE_TRANSFORMED |
NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN));
} else {
PresContext()->ConstructedFrame();
}
if (GetParent()) {
nsFrameState state = GetParent()->GetStateBits();
// Make bits that are currently off (see constructor) the same:
AddStateBits(state & (NS_FRAME_INDEPENDENT_SELECTION |
NS_FRAME_GENERATED_CONTENT | NS_FRAME_IS_SVG_TEXT |
NS_FRAME_IN_POPUP | NS_FRAME_IS_NONDISPLAY));
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) {
EffectSet* effectSet = EffectSet::GetEffectSet(this);
if (effectSet) {
mMayHaveOpacityAnimation = effectSet->MayHaveOpacityAnimation();
mMayHaveTransformAnimation = effectSet->MayHaveTransformAnimation();
}
}
const nsStyleDisplay* disp = StyleDisplay();
if (disp->HasTransform(this) ||
(IsFrameOfType(eSupportsCSSTransforms) &&
nsLayoutUtils::HasAnimationOfProperty(this, eCSSProperty_transform))) {
// The frame gets reconstructed if we toggle the -moz-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)) {
// Frames that have contain:layout+size can be reflow roots.
// 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)) {
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.
if (!IsPlaceholderFrame()) {
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?");
SVGObserverUtils::InvalidateDirectRenderingObservers(this);
if (StyleDisplay()->mPosition == NS_STYLE_POSITION_STICKY) {
StickyScrollContainer* ssc =
StickyScrollContainer::GetStickyScrollContainerForFrame(this);
if (ssc) {
ssc->RemoveFrame(this);
}
}
nsPresContext* presContext = PresContext();
nsIPresShell* shell = 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);
}
if (HasCSSAnimations() || HasCSSTransitions() ||
EffectSet::GetEffectSet(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);
shell->NotifyDestroyingFrame(this);
if (mState & NS_FRAME_EXTERNAL_REFERENCE) {
shell->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 = shell->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.
shell->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(
nsFrame* aFrame, const nsStyleImageLayers* aOldLayers,
const nsStyleImageLayers* aNewLayers) {
ImageLoader* imageLoader =
aFrame->PresContext()->Document()->StyleImageLoader();
// 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,
[&imageLoader, aFrame](imgRequestProxy* aReq) {
imageLoader->DisassociateRequestFromFrame(aReq, aFrame);
});
}
CompareLayers(aNewLayers, aOldLayers,
[&imageLoader, aFrame](imgRequestProxy* aReq) {
imageLoader->AssociateRequestToFrame(aReq, aFrame, 0);
});
}
void nsIFrame::AddDisplayItem(nsDisplayItem* 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(nsDisplayItem* 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(nsDisplayItem* aItem) {
DisplayItemArray* items = GetProperty(DisplayItems());
if (!items) {
return false;
}
return items->Contains(aItem);
}
void nsIFrame::RemoveDisplayItemDataForDeletion() {
FrameLayerBuilder::RemoveFrameFromLayerManager(this, DisplayItemData());
DisplayItemData().Clear();
DisplayItemArray* items = RemoveProperty(DisplayItems());
if (items) {
for (nsDisplayItem* i : *items) {
if (i->GetDependentFrame() == this && !i->HasDeletedFrame()) {
i->Frame()->MarkNeedsDisplayItemRebuild();
}
i->RemoveFrame(this);
}
delete items;
}
if (!nsLayoutUtils::AreRetainedDisplayListsEnabled()) {
// Retained display lists are disabled, no need to update
// RetainedDisplayListData.
return;
}
const bool updateData = IsFrameModified() || HasOverrideDirtyRegion() ||
MayHaveWillChangeBudget();
if (!updateData) {
// No RetainedDisplayListData to update.
return;
}
nsIFrame* rootFrame = PresShell()->GetRootFrame();
MOZ_ASSERT(rootFrame);
RetainedDisplayListData* data = GetOrSetRetainedDisplayListData(rootFrame);
if (MayHaveWillChangeBudget()) {
// Keep the frame in list, so it can be removed from the will-change budget.
data->Flags(this) = RetainedDisplayListData::FrameFlags::HadWillChange;
return;
}
if (IsFrameModified() || HasOverrideDirtyRegion()) {
// Remove deleted frames from RetainedDisplayListData.
DebugOnly<bool> removed = data->Remove(this);
MOZ_ASSERT(removed,
"Frame had flags set, but it was not found in DisplayListData!");
}
}
void nsIFrame::MarkNeedsDisplayItemRebuild() {
if (!nsLayoutUtils::AreRetainedDisplayListsEnabled() || IsFrameModified() ||
HasAnyStateBits(NS_FRAME_IN_POPUP)) {
// Skip frames that are already marked modified.
return;
}
if (Type() == LayoutFrameType::Placeholder) {
nsIFrame* oof = static_cast<nsPlaceholderFrame*>(this)->GetOutOfFlowFrame();
if (oof) {
oof->MarkNeedsDisplayItemRebuild();
}
// Do not mark placeholder frames modified.
return;
}
if (!nsLayoutUtils::DisplayRootHasRetainedDisplayListBuilder(this)) {
return;
}
nsIFrame* rootFrame = PresShell()->GetRootFrame();
MOZ_ASSERT(rootFrame);
if (rootFrame->IsFrameModified()) {
return;
}
RetainedDisplayListData* data = GetOrSetRetainedDisplayListData(rootFrame);
if (data->ModifiedFramesCount() > gfxPrefs::LayoutRebuildFrameLimit()) {
// If the modified frames count is above the rebuild limit, mark the root
// frame modified, and stop marking additional frames modified.
data->AddModifiedFrame(rootFrame);
rootFrame->SetFrameIsModified(true);
return;
}
data->AddModifiedFrame(this);
SetFrameIsModified(true);
MOZ_ASSERT(
PresContext()->LayoutPhaseCount(eLayoutPhase_DisplayListBuilding) == 0);
// Hopefully this is cheap, but we could use a frame state bit to note
// the presence of dependencies to speed it up.
DisplayItemArray* items = GetProperty(DisplayItems());
if (items) {
for (nsDisplayItem* i : *items) {
if (i->HasDeletedFrame() || i->Frame() == this) {
// Ignore the items with deleted frames, and the items with |this| as
// the primary frame.
continue;
}
if (i->GetDependentFrame() == this) {
// For items with |this| as a dependent frame, mark the primary frame
// for rebuild.
i->Frame()->MarkNeedsDisplayItemRebuild();
}
}
}
}
// Subclass hook for style post processing
/* virtual */ void nsFrame::DidSetComputedStyle(
ComputedStyle* aOldComputedStyle) {
if (nsSVGUtils::IsInSVGTextSubtree(this)) {
SVGTextFrame* svgTextFrame = static_cast<SVGTextFrame*>(
nsLayoutUtils::GetClosestFrameOfType(this, LayoutFrameType::SVGText));
nsIFrame* anonBlock = svgTextFrame->PrincipalChildList().FirstChild();
// Just as in SVGTextFrame::DidSetComputedStyle, we need to ensure that
// any non-display SVGTextFrames get reflowed when a child text frame
// gets new style.
//
// Note that we must check NS_FRAME_FIRST_REFLOW on our SVGTextFrame's
// anonymous block frame rather than our self, 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->GetStateBits() & NS_FRAME_FIRST_REFLOW) &&
(svgTextFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY) &&
!(svgTextFrame->GetStateBits() & NS_STATE_SVG_TEXT_IN_REFLOW)) {
svgTextFrame->ScheduleReflowSVGNonDisplayText(nsIPresShell::eStyleChange);
}
}
const nsStyleImageLayers* oldLayers =
aOldComputedStyle ? &aOldComputedStyle->StyleBackground()->mImage
: nullptr;
const nsStyleImageLayers* newLayers = &StyleBackground()->mImage;
AddAndRemoveImageAssociations(this, oldLayers, newLayers);
oldLayers =
aOldComputedStyle ? &aOldComputedStyle->StyleSVGReset()->mMask : nullptr;
newLayers = &StyleSVGReset()->mMask;
AddAndRemoveImageAssociations(this, oldLayers, newLayers);
if (aOldComputedStyle) {
// If we detect a change on margin, padding or border, we store the old
// values on the frame itself between now and reflow, so if someone
// calls GetUsed(Margin|Border|Padding)() before the next reflow, we
// can give an accurate answer.
// We don't want to set the property if one already exists.
nsMargin oldValue(0, 0, 0, 0);
nsMargin newValue(0, 0, 0, 0);
const nsStyleMargin* oldMargin = aOldComputedStyle->PeekStyleMargin();
if (oldMargin && oldMargin->GetMargin(oldValue)) {
if ((!StyleMargin()->GetMargin(newValue) || oldValue != newValue) &&
!HasProperty(UsedMarginProperty())) {
AddProperty(UsedMarginProperty(), new nsMargin(oldValue));
}
}
const nsStylePadding* oldPadding = aOldComputedStyle->PeekStylePadding();
if (oldPadding && oldPadding->GetPadding(oldValue)) {
if ((!StylePadding()->GetPadding(newValue) || oldValue != newValue) &&
!HasProperty(UsedPaddingProperty())) {
AddProperty(UsedPaddingProperty(), new nsMargin(oldValue));
}
}
const nsStyleBorder* oldBorder = aOldComputedStyle->PeekStyleBorder();
if (oldBorder) {
oldValue = oldBorder->GetComputedBorder();
newValue = StyleBorder()->GetComputedBorder();
if (oldValue != newValue && !HasProperty(UsedBorderProperty())) {
AddProperty(UsedBorderProperty(), new nsMargin(oldValue));
}
}
}
ImageLoader* imageLoader = PresContext()->Document()->StyleImageLoader();
imgIRequest* oldBorderImage =
aOldComputedStyle
? aOldComputedStyle->StyleBorder()->GetBorderImageRequest()
: nullptr;
imgIRequest* newBorderImage = StyleBorder()->GetBorderImageRequest();
// FIXME (Bug 759996): The following is no longer true.
// For border-images, we can't be as conservative (we need to set the
// new loaders if there has been any change) since the CalcDifference
// call depended on the result of GetComputedBorder() and that result
// depends on whether the image has loaded, start the image load now
// so that we'll get notified when it completes loading and can do a
// restyle. Otherwise, the image might finish loading from the
// network before we start listening to its notifications, and then
// we'll never know that it's finished loading. Likewise, we want to
// do this for freshly-created frames to prevent a similar race if the
// image loads between reflow (which can depend on whether the image
// is loaded) and paint. We also don't really care about any callers who try
// to paint borders with a different style, because they won't have the
// correct size for the border either.
if (oldBorderImage != newBorderImage) {
// stop and restart the image loading/notification
if (oldBorderImage && HasImageRequest()) {
imageLoader->DisassociateRequestFromFrame(oldBorderImage, this);
}
if (newBorderImage) {
imageLoader->AssociateRequestToFrame(newBorderImage, this, 0);
}
}
imgIRequest* oldShapeImage =
aOldComputedStyle
? aOldComputedStyle->StyleDisplay()->mShapeOutside.GetShapeImageData()
: nullptr;
imgIRequest* newShapeImage =
StyleDisplay()->mShapeOutside.GetShapeImageData();
if (oldShapeImage != newShapeImage) {
if (oldShapeImage && HasImageRequest()) {
imageLoader->DisassociateRequestFromFrame(oldShapeImage, this);
}
if (newShapeImage) {
imageLoader->AssociateRequestToFrame(
newShapeImage, this, ImageLoader::REQUEST_REQUIRES_REFLOW);
}
}
// SVGObserverUtils::GetEffectProperties() asserts that we only invoke it with
// the first continuation so we need to check that in advance. Continuing text
// frame doesn't initialize its continuation pointer before reaching here for
// the first time, so we have to exclude text frames. This doesn't affect
// correctness because text nodes themselves shouldn't have effects applied.
if (!IsTextFrame() && !GetPrevContinuation()) {
// Kick off loading of external SVG resources referenced from properties if
// any. This currently includes filter, clip-path, and mask.
SVGObserverUtils::InitiateResourceDocLoads(this);
}
// If the page contains markup that overrides text direction, and
// does not contain any characters that would activate the Unicode
// bidi algorithm, we need to call |SetBidiEnabled| on the pres
// context before reflow starts. See bug 115921.
if (StyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
PresContext()->SetBidiEnabled();
}
RemoveStateBits(NS_FRAME_SIMPLE_EVENT_REGIONS | NS_FRAME_SIMPLE_DISPLAYLIST);
mMayHaveRoundedCorners = true;
}
#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
void nsIFrame::AssertNewStyleIsSane(ComputedStyle& aNewStyle) {
MOZ_DIAGNOSTIC_ASSERT(PresShell() ==
aNewStyle.PresContextForFrame()->PresShell());
MOZ_DIAGNOSTIC_ASSERT(
aNewStyle.GetPseudo() == mComputedStyle->GetPseudo() ||
// ::first-line continuations are weird, this should probably be fixed via
// bug 1465474.
(mComputedStyle->GetPseudo() == nsCSSPseudoElements::firstLine() &&
aNewStyle.GetPseudo() == nsCSSAnonBoxes::mozLineFrame()) ||
// ::first-letter continuations are broken, in particular floating ones,
// see bug 1490281. The construction code tries to fix this up after the
// fact, then restyling undoes it...
(mComputedStyle->GetPseudo() == nsCSSAnonBoxes::mozText() &&
aNewStyle.GetPseudo() == nsCSSAnonBoxes::firstLetterContinuation()) ||
(mComputedStyle->GetPseudo() ==
nsCSSAnonBoxes::firstLetterContinuation() &&
aNewStyle.GetPseudo() == nsCSSAnonBoxes::mozText()));
}
#endif
void nsIFrame::ReparentFrameViewTo(nsViewManager* aViewManager,
nsView* aNewParentView,
nsView* aOldParentView) {
if (HasView()) {
#ifdef MOZ_XUL
if (IsMenuPopupFrame()) {
// This view must be parented by the root view, don't reparent it.
return;
}
#endif
nsView* view = GetView();
// Verify that the current parent view is what we think it is
// nsView* parentView;
// NS_ASSERTION(parentView == aOldParentView, "unexpected parent view");
aViewManager->RemoveChild(view);
// The view will remember the Z-order and other attributes that have been
// set on it.
nsView* insertBefore =
nsLayoutUtils::FindSiblingViewFor(aNewParentView, this);
aViewManager->InsertChild(aNewParentView, view, insertBefore,
insertBefore != nullptr);
} else if (GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW) {
nsIFrame::ChildListIterator lists(this);
for (; !lists.IsDone(); lists.Next()) {
// Iterate the child frames, and check each child frame to see if it has
// a view
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
childFrames.get()->ReparentFrameViewTo(aViewManager, aNewParentView,
aOldParentView);
}
}
}
}
void nsIFrame::SyncFrameViewProperties(nsView* aView) {
if (!aView) {
aView = GetView();
if (!aView) {
return;
}
}
nsViewManager* vm = aView->GetViewManager();
// Make sure visibility is correct. This only affects nsSubDocumentFrame.
if (!SupportsVisibilityHidden()) {
// See if the view should be hidden or visible
ComputedStyle* sc = Style();
vm->SetViewVisibility(aView, sc->StyleVisibility()->IsVisible()
? nsViewVisibility_kShow
: nsViewVisibility_kHide);
}
int32_t zIndex = 0;
bool autoZIndex = false;
if (IsAbsPosContainingBlock()) {
// Make sure z-index is correct
ComputedStyle* sc = Style();
const nsStylePosition* position = sc->StylePosition();
if (position->mZIndex.GetUnit() == eStyleUnit_Integer) {
zIndex = position->mZIndex.GetIntValue();
} else if (position->mZIndex.GetUnit() == eStyleUnit_Auto) {
autoZIndex = true;
}
} else {
autoZIndex = true;
}
vm->SetViewZIndex(aView, autoZIndex, zIndex);
}
void nsFrame::CreateView() {
MOZ_ASSERT(!HasView());
nsView* parentView = GetParent()->GetClosestView();
MOZ_ASSERT(parentView, "no parent with view");
nsViewManager* viewManager = parentView->GetViewManager();
MOZ_ASSERT(viewManager, "null view manager");
nsView* view = viewManager->CreateView(GetRect(), parentView);
SyncFrameViewProperties(view);
nsView* insertBefore = nsLayoutUtils::FindSiblingViewFor(parentView, this);
// we insert this view 'above' the insertBefore view, unless insertBefore is
// null, in which case we want to call with aAbove == false to insert at the
// beginning in document order
viewManager->InsertChild(parentView, view, insertBefore,
insertBefore != nullptr);
// REVIEW: Don't create a widget for fixed-pos elements anymore.
// ComputeRepaintRegionForCopy will calculate the right area to repaint
// when we scroll.
// Reparent views on any child frames (or their descendants) to this
// view. We can just call ReparentFrameViewTo on this frame because
// we know this frame has no view, so it will crawl the children. Also,
// we know that any descendants with views must have 'parentView' as their
// parent view.
ReparentFrameViewTo(viewManager, view, parentView);
// Remember our view
SetView(view);
NS_FRAME_LOG(NS_FRAME_TRACE_CALLS,
("nsFrame::CreateView: frame=%p view=%p", this, view));
}
// MSVC fails with link error "one or more multiply defined symbols found",
// gcc fails with "hidden symbol `nsIFrame::kPrincipalList' isn't defined"
// etc if they are not defined.
#ifndef _MSC_VER
// static nsIFrame constants; initialized in the header file.
const nsIFrame::ChildListID nsIFrame::kPrincipalList;
const nsIFrame::ChildListID nsIFrame::kAbsoluteList;
const nsIFrame::ChildListID nsIFrame::kBulletList;
const nsIFrame::ChildListID nsIFrame::kCaptionList;
const nsIFrame::ChildListID nsIFrame::kColGroupList;
const nsIFrame::ChildListID nsIFrame::kExcessOverflowContainersList;
const nsIFrame::ChildListID nsIFrame::kFixedList;
const nsIFrame::ChildListID nsIFrame::kFloatList;
const nsIFrame::ChildListID nsIFrame::kOverflowContainersList;
const nsIFrame::ChildListID nsIFrame::kOverflowList;
const nsIFrame::ChildListID nsIFrame::kOverflowOutOfFlowList;
const nsIFrame::ChildListID nsIFrame::kPopupList;
const nsIFrame::ChildListID nsIFrame::kPushedFloatsList;
const nsIFrame::ChildListID nsIFrame::kSelectPopupList;
const nsIFrame::ChildListID nsIFrame::kNoReflowPrincipalList;
#endif
/* virtual */ nsMargin nsIFrame::GetUsedMargin() const {
nsMargin margin(0, 0, 0, 0);
if (((mState & NS_FRAME_FIRST_REFLOW) && !(mState & NS_FRAME_IN_REFLOW)) ||
nsSVGUtils::IsInSVGTextSubtree(this))
return margin;
nsMargin* m = GetProperty(UsedMarginProperty());
if (m) {
margin = *m;
} else {
if (!StyleMargin()->GetMargin(margin)) {
// If we get here, our caller probably shouldn't be calling us...
NS_ERROR(
"Returning bogus 0-sized margin, because this margin "
"depends on layout & isn't cached!");
}
}
return margin;
}
/* virtual */ nsMargin nsIFrame::GetUsedBorder() const {
nsMargin border(0, 0, 0, 0);
if (((mState & NS_FRAME_FIRST_REFLOW) && !(mState & NS_FRAME_IN_REFLOW)) ||
nsSVGUtils::IsInSVGTextSubtree(this))
return border;
// Theme methods don't use const-ness.
nsIFrame* mutable_this = const_cast<nsIFrame*>(this);
const nsStyleDisplay* disp = StyleDisplay();
if (mutable_this->IsThemed(disp)) {
nsPresContext* pc = PresContext();
LayoutDeviceIntMargin widgetBorder = pc->GetTheme()->GetWidgetBorder(
pc->DeviceContext(), mutable_this, disp->mAppearance);
border =
LayoutDevicePixel::ToAppUnits(widgetBorder, pc->AppUnitsPerDevPixel());
return border;
}
nsMargin* b = GetProperty(UsedBorderProperty());
if (b) {
border = *b;
} else {
border = StyleBorder()->GetComputedBorder();
}
return border;
}
/* virtual */ nsMargin nsIFrame::GetUsedPadding() const {
nsMargin padding(0, 0, 0, 0);
if (((mState & NS_FRAME_FIRST_REFLOW) && !(mState & NS_FRAME_IN_REFLOW)) ||
nsSVGUtils::IsInSVGTextSubtree(this))
return padding;
// Theme methods don't use const-ness.
nsIFrame* mutable_this = const_cast<nsIFrame*>(this);
const nsStyleDisplay* disp = StyleDisplay();
if (mutable_this->IsThemed(disp)) {
nsPresContext* pc = PresContext();
LayoutDeviceIntMargin widgetPadding;
if (pc->GetTheme()->GetWidgetPadding(pc->DeviceContext(), mutable_this,
disp->mAppearance, &widgetPadding)) {
return LayoutDevicePixel::ToAppUnits(widgetPadding,
pc->AppUnitsPerDevPixel());
}
}
nsMargin* p = GetProperty(UsedPaddingProperty());
if (p) {
padding = *p;
} else {
if (!StylePadding()->GetPadding(padding)) {
// If we get here, our caller probably shouldn't be calling us...
NS_ERROR(
"Returning bogus 0-sized padding, because this padding "
"depends on layout & isn't cached!");
}
}
return padding;
}
nsIFrame::Sides nsIFrame::GetSkipSides(const ReflowInput* aReflowInput) const {
if (MOZ_UNLIKELY(StyleBorder()->mBoxDecorationBreak ==
StyleBoxDecorationBreak::Clone) &&
!(GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
return Sides();
}
// Convert the logical skip sides to physical sides using the frame's
// writing mode
WritingMode writingMode = GetWritingMode();
LogicalSides logicalSkip = GetLogicalSkipSides(aReflowInput);
Sides skip;
if (logicalSkip.BStart()) {
if (writingMode.IsVertical()) {
skip |= writingMode.IsVerticalLR() ? eSideBitsLeft : eSideBitsRight;
} else {
skip |= eSideBitsTop;
}
}
if (logicalSkip.BEnd()) {
if (writingMode.IsVertical()) {
skip |= writingMode.IsVerticalLR() ? eSideBitsRight : eSideBitsLeft;
} else {
skip |= eSideBitsBottom;
}
}
if (logicalSkip.IStart()) {
if (writingMode.IsVertical()) {
skip |= eSideBitsTop;
} else {
skip |= writingMode.IsBidiLTR() ? eSideBitsLeft : eSideBitsRight;
}
}
if (logicalSkip.IEnd()) {
if (writingMode.IsVertical()) {
skip |= eSideBitsBottom;
} else {
skip |= writingMode.IsBidiLTR() ? eSideBitsRight : eSideBitsLeft;
}
}
return skip;
}
nsRect nsIFrame::GetPaddingRectRelativeToSelf() const {
nsMargin border(GetUsedBorder());
border.ApplySkipSides(GetSkipSides());
nsRect r(0, 0, mRect.width, mRect.height);
r.Deflate(border);
return r;
}
nsRect nsIFrame::GetPaddingRect() const {
return GetPaddingRectRelativeToSelf() + GetPosition();
}
WritingMode nsIFrame::WritingModeForLine(WritingMode aSelfWM,
nsIFrame* aSubFrame) const {
MOZ_ASSERT(aSelfWM == GetWritingMode());
WritingMode writingMode = aSelfWM;
if (StyleTextReset()->mUnicodeBidi & NS_STYLE_UNICODE_BIDI_PLAINTEXT) {
nsBidiLevel frameLevel = nsBidiPresUtils::GetFrameBaseLevel(aSubFrame);
writingMode.SetDirectionFromBidiLevel(frameLevel);
}
return writingMode;
}
nsRect nsIFrame::GetMarginRectRelativeToSelf() const {
nsMargin m = GetUsedMargin();
m.ApplySkipSides(GetSkipSides());
nsRect r(0, 0, mRect.width, mRect.height);
r.Inflate(m);
return r;
}
bool nsIFrame::IsTransformed(const nsStyleDisplay* aStyleDisplay) const {
return IsCSSTransformed(aStyleDisplay) || IsSVGTransformed();
}
bool nsIFrame::IsCSSTransformed(const nsStyleDisplay* aStyleDisplay) const {
MOZ_ASSERT(aStyleDisplay == StyleDisplay());
return ((mState & NS_FRAME_MAY_BE_TRANSFORMED) &&
(aStyleDisplay->HasTransform(this) || HasAnimationOfTransform()));
}
bool nsIFrame::HasAnimationOfTransform() const {
return IsPrimaryFrame() &&
nsLayoutUtils::HasAnimationOfProperty(this, eCSSProperty_transform) &&
IsFrameOfType(eSupportsCSSTransforms);
}
bool nsIFrame::ChildrenHavePerspective(
const nsStyleDisplay* aStyleDisplay) const {
MOZ_ASSERT(aStyleDisplay == StyleDisplay());
return aStyleDisplay->HasPerspective(this);
}
bool nsIFrame::HasOpacityInternal(float aThreshold,
const nsStyleDisplay* aStyleDisplay,
const nsStyleEffects* aStyleEffects,
EffectSet* aEffectSet) const {
MOZ_ASSERT(0.0 <= aThreshold && aThreshold <= 1.0, "Invalid argument");
if (aStyleEffects->mOpacity < aThreshold ||
(aStyleDisplay->mWillChangeBitField & NS_STYLE_WILL_CHANGE_OPACITY)) {
return true;
}
if (!mMayHaveOpacityAnimation) {
return false;
}
EffectSet* effects = aEffectSet ? aEffectSet : EffectSet::GetEffectSet(this);
if (!effects) {
return false;
}
return ((IsPrimaryFrame() ||
nsLayoutUtils::FirstContinuationOrIBSplitSibling(this)
->IsPrimaryFrame()) &&
nsLayoutUtils::HasAnimationOfProperty(effects, eCSSProperty_opacity));
}
bool nsIFrame::IsSVGTransformed(gfx::Matrix* aOwnTransforms,
gfx::Matrix* aFromParentTransforms) const {
return false;
}
bool nsIFrame::Extend3DContext(const nsStyleDisplay* aStyleDisplay,
const nsStyleEffects* aStyleEffects,
mozilla::EffectSet* aEffectSet) const {
if (!(mState & NS_FRAME_MAY_BE_TRANSFORMED)) {
return false;
}
const nsStyleDisplay* disp = StyleDisplayWithOptionalParam(aStyleDisplay);
if (disp->mTransformStyle != NS_STYLE_TRANSFORM_STYLE_PRESERVE_3D ||
!IsFrameOfType(nsIFrame::eSupportsCSSTransforms)) {
return false;
}
// If we're all scroll frame, then all descendants will be clipped, so we
// can't preserve 3d.
if (IsScrollFrame()) {
return false;
}
const nsStyleEffects* effects = StyleEffectsWithOptionalParam(aStyleEffects);
if (HasOpacity(disp, effects, aEffectSet)) {
return false;
}
return !nsFrame::ShouldApplyOverflowClipping(this, disp) &&
!GetClipPropClipRect(disp, effects, GetSize()) &&
!nsSVGIntegrationUtils::UsingEffectsForFrame(this);
}
bool nsIFrame::Combines3DTransformWithAncestors(
const nsStyleDisplay* aStyleDisplay) const {
MOZ_ASSERT(aStyleDisplay == StyleDisplay());
nsIFrame* parent = GetClosestFlattenedTreeAncestorPrimaryFrame();
if (!parent || !parent->Extend3DContext()) {
return false;
}
return IsCSSTransformed(aStyleDisplay) || BackfaceIsHidden(aStyleDisplay);
}
bool nsIFrame::In3DContextAndBackfaceIsHidden() const {
// While both tests fail most of the time, test BackfaceIsHidden()
// first since it's likely to fail faster.
const nsStyleDisplay* disp = StyleDisplay();
return BackfaceIsHidden(disp) && Combines3DTransformWithAncestors(disp);
}
bool nsIFrame::HasPerspective(const nsStyleDisplay* aStyleDisplay) const {
MOZ_ASSERT(aStyleDisplay == StyleDisplay());
if (!IsTransformed(aStyleDisplay)) {
return false;
}
nsIFrame* containingBlock =
GetContainingBlock(SKIP_SCROLLED_FRAME, aStyleDisplay);
if (!containingBlock) {
return false;
}
return containingBlock->ChildrenHavePerspective();
}
nsRect nsIFrame::GetContentRectRelativeToSelf() const {
nsMargin bp(GetUsedBorderAndPadding());
bp.ApplySkipSides(GetSkipSides());
nsRect r(0, 0, mRect.width, mRect.height);
r.Deflate(bp);
return r;
}
nsRect nsIFrame::GetContentRect() const {
return GetContentRectRelativeToSelf() + GetPosition();
}
bool nsIFrame::ComputeBorderRadii(const nsStyleCorners& aBorderRadius,
const nsSize& aFrameSize,
const nsSize& aBorderArea, Sides aSkipSides,
nscoord aRadii[8]) {
// Percentages are relative to whichever side they're on.
NS_FOR_CSS_HALF_CORNERS(i) {
const nsStyleCoord c = aBorderRadius.Get(i);
nscoord axis = HalfCornerIsX(i) ? aFrameSize.width : aFrameSize.height;
if (c.IsCoordPercentCalcUnit()) {
aRadii[i] = c.ComputeCoordPercentCalc(axis);
if (aRadii[i] < 0) {
// clamp calc()
aRadii[i] = 0;
}
} else {
MOZ_ASSERT_UNREACHABLE("ComputeBorderRadii: bad unit");
aRadii[i] = 0;
}
}
if (aSkipSides.Top()) {
aRadii[eCornerTopLeftX] = 0;
aRadii[eCornerTopLeftY] = 0;
aRadii[eCornerTopRightX] = 0;
aRadii[eCornerTopRightY] = 0;
}
if (aSkipSides.Right()) {
aRadii[eCornerTopRightX] = 0;
aRadii[eCornerTopRightY] = 0;
aRadii[eCornerBottomRightX] = 0;
aRadii[eCornerBottomRightY] = 0;
}
if (aSkipSides.Bottom()) {
aRadii[eCornerBottomRightX] = 0;
aRadii[eCornerBottomRightY] = 0;
aRadii[eCornerBottomLeftX] = 0;
aRadii[eCornerBottomLeftY] = 0;
}
if (aSkipSides.Left()) {
aRadii[eCornerBottomLeftX] = 0;
aRadii[eCornerBottomLeftY] = 0;
aRadii[eCornerTopLeftX] = 0;
aRadii[eCornerTopLeftY] = 0;
}
// css3-background specifies this algorithm for reducing
// corner radii when they are too big.
bool haveRadius = false;
double ratio = 1.0f;
NS_FOR_CSS_SIDES(side) {
uint32_t hc1 = SideToHalfCorner(side, false, true);
uint32_t hc2 = SideToHalfCorner(side, true, true);
nscoord length =
SideIsVertical(side) ? aBorderArea.height : aBorderArea.width;
nscoord sum = aRadii[hc1] + aRadii[hc2];
if (sum) haveRadius = true;
// avoid floating point division in the normal case
if (length < sum) ratio = std::min(ratio, double(length) / sum);
}
if (ratio < 1.0) {
NS_FOR_CSS_HALF_CORNERS(corner) { aRadii[corner] *= ratio; }
}
return haveRadius;
}
/* static */ void nsIFrame::InsetBorderRadii(nscoord aRadii[8],
const nsMargin& aOffsets) {
NS_FOR_CSS_SIDES(side) {
nscoord offset = aOffsets.Side(side);
uint32_t hc1 = SideToHalfCorner(side, false, false);
uint32_t hc2 = SideToHalfCorner(side, true, false);
aRadii[hc1] = std::max(0, aRadii[hc1] - offset);
aRadii[hc2] = std::max(0, aRadii[hc2] - offset);
}
}
/* static */ void nsIFrame::OutsetBorderRadii(nscoord aRadii[8],
const nsMargin& aOffsets) {
auto AdjustOffset = [](const uint32_t aRadius, const nscoord aOffset) {
// Implement the cubic formula to adjust offset when aOffset > 0 and
// aRadius / aOffset < 1.
// https://drafts.csswg.org/css-shapes/#valdef-shape-box-margin-box
if (aOffset > 0) {
const double ratio = aRadius / double(aOffset);
if (ratio < 1.0) {
return nscoord(aOffset * (1.0 + std::pow(ratio - 1, 3)));
}
}
return aOffset;
};
NS_FOR_CSS_SIDES(side) {
const nscoord offset = aOffsets.Side(side);
const uint32_t hc1 = SideToHalfCorner(side, false, false);
const uint32_t hc2 = SideToHalfCorner(side, true, false);
if (aRadii[hc1] > 0) {
const nscoord offset1 = AdjustOffset(aRadii[hc1], offset);
aRadii[hc1] = std::max(0, aRadii[hc1] + offset1);
}
if (aRadii[hc2] > 0) {
const nscoord offset2 = AdjustOffset(aRadii[hc2], offset);
aRadii[hc2] = std::max(0, aRadii[hc2] + offset2);
}
}
}
/* virtual */ bool nsIFrame::GetBorderRadii(const nsSize& aFrameSize,
const nsSize& aBorderArea,
Sides aSkipSides,
nscoord aRadii[8]) const {
if (!mMayHaveRoundedCorners) {
memset(aRadii, 0, sizeof(nscoord) * 8);
return false;
}
if (IsThemed()) {
// When we're themed, the native theme code draws the border and
// background, and therefore it doesn't make sense to tell other
// code that's interested in border-radius that we have any radii.
//
// In an ideal world, we might have a way for the them to tell us an
// border radius, but since we don't, we're better off assuming
// zero.
NS_FOR_CSS_HALF_CORNERS(corner) { aRadii[corner] = 0; }
return false;
}
const_cast<nsIFrame*>(this)->mMayHaveRoundedCorners =
ComputeBorderRadii(StyleBorder()->mBorderRadius, aFrameSize, aBorderArea,
aSkipSides, aRadii);
return mMayHaveRoundedCorners;
}
bool nsIFrame::GetBorderRadii(nscoord aRadii[8]) const {
nsSize sz = GetSize();
return GetBorderRadii(sz, sz, GetSkipSides(), aRadii);
}
bool nsIFrame::GetMarginBoxBorderRadii(nscoord aRadii[8]) const {
return GetBoxBorderRadii(aRadii, GetUsedMargin(), true);
}
bool nsIFrame::GetPaddingBoxBorderRadii(nscoord aRadii[8]) const {
return GetBoxBorderRadii(aRadii, GetUsedBorder(), false);
}
bool nsIFrame::GetContentBoxBorderRadii(nscoord aRadii[8]) const {
return GetBoxBorderRadii(aRadii, GetUsedBorderAndPadding(), false);
}
bool nsIFrame::GetBoxBorderRadii(nscoord aRadii[8], nsMargin aOffset,
bool aIsOutset) const {
if (!GetBorderRadii(aRadii)) return false;
if (aIsOutset) {
OutsetBorderRadii(aRadii, aOffset);
} else {
InsetBorderRadii(aRadii, aOffset);
}
NS_FOR_CSS_HALF_CORNERS(corner) {
if (aRadii[corner]) return true;
}
return false;
}
bool nsIFrame::GetShapeBoxBorderRadii(nscoord aRadii[8]) const {
switch (StyleDisplay()->mShapeOutside.GetReferenceBox()) {
case StyleGeometryBox::NoBox:
return false;
case StyleGeometryBox::ContentBox:
return GetContentBoxBorderRadii(aRadii);
case StyleGeometryBox::PaddingBox:
return GetPaddingBoxBorderRadii(aRadii);
case StyleGeometryBox::BorderBox:
return GetBorderRadii(aRadii);
case StyleGeometryBox::MarginBox:
return GetMarginBoxBorderRadii(aRadii);
default:
MOZ_ASSERT_UNREACHABLE("Unexpected box value");
return false;
}
}
ComputedStyle* nsFrame::GetAdditionalComputedStyle(int32_t aIndex) const {
MOZ_ASSERT(aIndex >= 0, "invalid index number");
return nullptr;
}
void nsFrame::SetAdditionalComputedStyle(int32_t aIndex,
ComputedStyle* aComputedStyle) {
MOZ_ASSERT(aIndex >= 0, "invalid index number");
}
nscoord nsFrame::GetLogicalBaseline(WritingMode aWritingMode) const {
NS_ASSERTION(!NS_SUBTREE_DIRTY(this), "frame must not be dirty");
// Baseline for inverted line content is the top (block-start) margin edge,
// as the frame is in effect "flipped" for alignment purposes.
if (aWritingMode.IsLineInverted()) {
return -GetLogicalUsedMargin(aWritingMode).BStart(aWritingMode);
}
// Otherwise, the bottom margin edge, per CSS2.1's definition of the
// 'baseline' value of 'vertical-align'.
return BSize(aWritingMode) +
GetLogicalUsedMargin(aWritingMode).BEnd(aWritingMode);
}
const nsFrameList& nsFrame::GetChildList(ChildListID aListID) const {
if (IsAbsoluteContainer() && aListID == GetAbsoluteListID()) {
return GetAbsoluteContainingBlock()->GetChildList();
} else {
return nsFrameList::EmptyList();
}
}
void nsFrame::GetChildLists(nsTArray<ChildList>* aLists) const {
if (IsAbsoluteContainer()) {
nsFrameList absoluteList = GetAbsoluteContainingBlock()->GetChildList();
absoluteList.AppendIfNonempty(aLists, GetAbsoluteListID());
}
}
void nsIFrame::GetCrossDocChildLists(nsTArray<ChildList>* aLists) {
nsSubDocumentFrame* subdocumentFrame = do_QueryFrame(this);
if (subdocumentFrame) {
// Descend into the subdocument
nsIFrame* root = subdocumentFrame->GetSubdocumentRootFrame();
if (root) {
aLists->AppendElement(nsIFrame::ChildList(
nsFrameList(root, nsLayoutUtils::GetLastSibling(root)),
nsIFrame::kPrincipalList));
}
}
GetChildLists(aLists);
}
Visibility nsIFrame::GetVisibility() const {
if (!(GetStateBits() & NS_FRAME_VISIBILITY_IS_TRACKED)) {
return Visibility::UNTRACKED;
}
bool isSet = false;
uint32_t visibleCount = GetProperty(VisibilityStateProperty(), &isSet);
MOZ_ASSERT(isSet,
"Should have a VisibilityStateProperty value "
"if NS_FRAME_VISIBILITY_IS_TRACKED is set");
return visibleCount > 0 ? Visibility::APPROXIMATELY_VISIBLE
: Visibility::APPROXIMATELY_NONVISIBLE;
}
void nsIFrame::UpdateVisibilitySynchronously() {
nsIPresShell* presShell = PresShell();
if (!presShell) {
return;
}
if (presShell->AssumeAllFramesVisible()) {
presShell->EnsureFrameInApproximatelyVisibleList(this);
return;
}
bool visible = StyleVisibility()->IsVisible();
nsIFrame* f = GetParent();
nsRect rect = GetRectRelativeToSelf();
nsIFrame* rectFrame = this;
while (f && visible) {
nsIScrollableFrame* sf = do_QueryFrame(f);
if (sf) {
nsRect transformedRect =
nsLayoutUtils::TransformFrameRectToAncestor(rectFrame, rect, f);
if (!sf->IsRectNearlyVisible(transformedRect)) {
visible = false;
break;
}
// In this code we're trying to synchronously update *approximate*
// visibility. (In the future we may update precise visibility here as
// well, which is why the method name does not contain 'approximate'.) The
// IsRectNearlyVisible() check above tells us that the rect we're checking
// is approximately visible within the scrollframe, but we still need to
// ensure that, even if it was scrolled into view, it'd be visible when we
// consider the rest of the document. To do that, we move transformedRect
// to be contained in the scrollport as best we can (it might not fit) to
// pretend that it was scrolled into view.
rect = transformedRect.MoveInsideAndClamp(sf->GetScrollPortRect());
rectFrame = f;
}
nsIFrame* parent = f->GetParent();
if (!parent) {
parent = nsLayoutUtils::GetCrossDocParentFrame(f);
if (parent && parent->PresContext()->IsChrome()) {
break;
}
}
f = parent;
}
if (visible) {
presShell->EnsureFrameInApproximatelyVisibleList(this);
} else {
presShell->RemoveFrameFromApproximatelyVisibleList(this);
}
}
void nsIFrame::EnableVisibilityTracking() {
if (GetStateBits() & NS_FRAME_VISIBILITY_IS_TRACKED) {
return; // Nothing to do.
}
MOZ_ASSERT(!HasProperty(VisibilityStateProperty()),
"Shouldn't have a VisibilityStateProperty value "
"if NS_FRAME_VISIBILITY_IS_TRACKED is not set");
// Add the state bit so we know to track visibility for this frame, and
// initialize the frame property.
AddStateBits(NS_FRAME_VISIBILITY_IS_TRACKED);
SetProperty(VisibilityStateProperty(), 0);
nsIPresShell* presShell = PresShell();
if (!presShell) {
return;
}
// Schedule a visibility update. This method will virtually always be called
// when layout has changed anyway, so it's very unlikely that any additional
// visibility updates will be triggered by this, but this way we guarantee
// that if this frame is currently visible we'll eventually find out.
presShell->ScheduleApproximateFrameVisibilityUpdateSoon();
}
void nsIFrame::DisableVisibilityTracking() {
if (!(GetStateBits() & NS_FRAME_VISIBILITY_IS_TRACKED)) {
return; // Nothing to do.
}
bool isSet = false;
uint32_t visibleCount = RemoveProperty(VisibilityStateProperty(), &isSet);
MOZ_ASSERT(isSet,
"Should have a VisibilityStateProperty value "
"if NS_FRAME_VISIBILITY_IS_TRACKED is set");
RemoveStateBits(NS_FRAME_VISIBILITY_IS_TRACKED);
if (visibleCount == 0) {
return; // We were nonvisible.
}
// We were visible, so send an OnVisibilityChange() notification.
OnVisibilityChange(Visibility::APPROXIMATELY_NONVISIBLE);
}
void nsIFrame::DecApproximateVisibleCount(
const Maybe<OnNonvisible>& aNonvisibleAction
/* = Nothing() */) {
MOZ_ASSERT(GetStateBits() & NS_FRAME_VISIBILITY_IS_TRACKED);
bool isSet = false;
uint32_t visibleCount = GetProperty(VisibilityStateProperty(), &isSet);
MOZ_ASSERT(isSet,
"Should have a VisibilityStateProperty value "
"if NS_FRAME_VISIBILITY_IS_TRACKED is set");
MOZ_ASSERT(visibleCount > 0,
"Frame is already nonvisible and we're "
"decrementing its visible count?");
visibleCount--;
SetProperty(VisibilityStateProperty(), visibleCount);
if (visibleCount > 0) {
return;
}
// We just became nonvisible, so send an OnVisibilityChange() notification.
OnVisibilityChange(Visibility::APPROXIMATELY_NONVISIBLE, aNonvisibleAction);
}
void nsIFrame::IncApproximateVisibleCount() {
MOZ_ASSERT(GetStateBits() & NS_FRAME_VISIBILITY_IS_TRACKED);
bool isSet = false;
uint32_t visibleCount = GetProperty(VisibilityStateProperty(), &isSet);
MOZ_ASSERT(isSet,
"Should have a VisibilityStateProperty value "
"if NS_FRAME_VISIBILITY_IS_TRACKED is set");
visibleCount++;
SetProperty(VisibilityStateProperty(), visibleCount);
if (visibleCount > 1) {
return;
}
// We just became visible, so send an OnVisibilityChange() notification.
OnVisibilityChange(Visibility::APPROXIMATELY_VISIBLE);
}
void nsIFrame::OnVisibilityChange(Visibility aNewVisibility,
const Maybe<OnNonvisible>& aNonvisibleAction
/* = Nothing() */) {
// XXX(seth): In bug 1218990 we'll implement visibility tracking for CSS
// images here.
}
static nsIFrame* GetActiveSelectionFrame(nsPresContext* aPresContext,
nsIFrame* aFrame) {
nsIContent* capturingContent = nsIPresShell::GetCapturingContent();
if (capturingContent) {
nsIFrame* activeFrame = aPresContext->GetPrimaryFrameFor(capturingContent);
return activeFrame ? activeFrame : aFrame;
}
return aFrame;
}
int16_t nsFrame::DisplaySelection(nsPresContext* aPresContext,
bool isOkToTurnOn) {
int16_t selType = nsISelectionController::SELECTION_OFF;
nsCOMPtr<nsISelectionController> selCon;
nsresult result =
GetSelectionController(aPresContext, getter_AddRefs(selCon));
if (NS_SUCCEEDED(result) && selCon) {
result = selCon->GetDisplaySelection(&selType);
if (NS_SUCCEEDED(result) &&
(selType != nsISelectionController::SELECTION_OFF)) {
// Check whether style allows selection.
if (!IsSelectable(nullptr)) {
selType = nsISelectionController::SELECTION_OFF;
isOkToTurnOn = false;
}
}
if (isOkToTurnOn && (selType == nsISelectionController::SELECTION_OFF)) {
selCon->SetDisplaySelection(nsISelectionController::SELECTION_ON);
selType = nsISelectionController::SELECTION_ON;
}
}
return selType;
}
class nsDisplaySelectionOverlay : public nsDisplayItem {
public:
nsDisplaySelectionOverlay(nsDisplayListBuilder* aBuilder, nsFrame* aFrame,
int16_t aSelectionValue)
: nsDisplayItem(aBuilder, aFrame), mSelectionValue(aSelectionValue) {
MOZ_COUNT_CTOR(nsDisplaySelectionOverlay);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplaySelectionOverlay() {
MOZ_COUNT_DTOR(nsDisplaySelectionOverlay);
}
#endif
virtual void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override;
bool CreateWebRenderCommands(
mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc,
mozilla::layers::WebRenderLayerManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) override;
NS_DISPLAY_DECL_NAME("SelectionOverlay", TYPE_SELECTION_OVERLAY)
private:
Color ComputeColor() const;
static Color ComputeColorFromSelectionStyle(ComputedStyle&);
static Color ApplyTransparencyIfNecessary(nscolor);
int16_t mSelectionValue;
};
Color nsDisplaySelectionOverlay::ApplyTransparencyIfNecessary(nscolor aColor) {
// If it has already alpha, leave it like that.
if (NS_GET_A(aColor) != 255) {
return ToDeviceColor(aColor);
}
// NOTE(emilio): Blink and WebKit do something slightly different here, and
// blend the color with white instead, both for overlays and text backgrounds.
auto color = Color::FromABGR(aColor);
color.a = 0.5;
return ToDeviceColor(color);
}
Color nsDisplaySelectionOverlay::ComputeColorFromSelectionStyle(
ComputedStyle& aStyle) {
return ApplyTransparencyIfNecessary(
aStyle.GetVisitedDependentColor(&nsStyleBackground::mBackgroundColor));
}
Color nsDisplaySelectionOverlay::ComputeColor() const {
LookAndFeel::ColorID colorID;
if (mSelectionValue == nsISelectionController::SELECTION_ON) {
if (RefPtr<ComputedStyle> style = mFrame->ComputeSelectionStyle()) {
return ComputeColorFromSelectionStyle(*style);
}
colorID = LookAndFeel::eColorID_TextSelectBackground;
} else if (mSelectionValue == nsISelectionController::SELECTION_ATTENTION) {
colorID = LookAndFeel::eColorID_TextSelectBackgroundAttention;
} else {
colorID = LookAndFeel::eColorID_TextSelectBackgroundDisabled;
}
return ApplyTransparencyIfNecessary(
LookAndFeel::GetColor(colorID, NS_RGB(255, 255, 255)));
}
void nsDisplaySelectionOverlay::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
DrawTarget& aDrawTarget = *aCtx->GetDrawTarget();
ColorPattern color(ComputeColor());
nsIntRect pxRect = GetPaintRect().ToOutsidePixels(
mFrame->PresContext()->AppUnitsPerDevPixel());
Rect rect(pxRect.x, pxRect.y, pxRect.width, pxRect.height);
MaybeSnapToDevicePixels(rect, aDrawTarget, true);
aDrawTarget.FillRect(rect, color);
}
bool nsDisplaySelectionOverlay::CreateWebRenderCommands(
mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc,
mozilla::layers::WebRenderLayerManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
wr::LayoutRect bounds =
wr::ToRoundedLayoutRect(LayoutDeviceRect::FromAppUnits(
nsRect(ToReferenceFrame(), Frame()->GetSize()),
mFrame->PresContext()->AppUnitsPerDevPixel()));
aBuilder.PushRect(bounds, bounds, !BackfaceIsHidden(),
wr::ToColorF(ComputeColor()));
return true;
}
static Element* FindElementAncestorForMozSelection(nsIContent* aContent) {
NS_ENSURE_TRUE(aContent, nullptr);
while (aContent && aContent->IsInNativeAnonymousSubtree()) {
aContent = aContent->GetBindingParent();
}
NS_ASSERTION(aContent, "aContent isn't in non-anonymous tree?");
while (aContent && !aContent->IsElement()) {
aContent = aContent->GetParent();
}
return aContent ? aContent->AsElement() : nullptr;
}
already_AddRefed<ComputedStyle> nsIFrame::ComputeSelectionStyle() const {
Element* element = FindElementAncestorForMozSelection(GetContent());
if (!element) {
return nullptr;
}
RefPtr<ComputedStyle> sc = PresContext()->StyleSet()->ProbePseudoElementStyle(
*element, CSSPseudoElementType::selection, Style());
return sc.forget();
}
/********************************************************
* Refreshes each content's frame
*********************************************************/
void nsFrame::DisplaySelectionOverlay(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList,
uint16_t aContentType) {
if (!IsSelected() || !IsVisibleForPainting()) {
return;
}
int16_t displaySelection = PresShell()->GetSelectionFlags();
if (!(displaySelection & aContentType)) {
return;
}
const nsFrameSelection* frameSelection = GetConstFrameSelection();
int16_t selectionValue = frameSelection->GetDisplaySelection();
if (selectionValue <= nsISelectionController::SELECTION_HIDDEN) {
return; // selection is hidden or off
}
nsIContent* newContent = mContent->GetParent();
// check to see if we are anonymous content
int32_t offset = 0;
if (newContent) {
// XXXbz there has GOT to be a better way of determining this!
offset = newContent->ComputeIndexOf(mContent);
}
// look up to see what selection(s) are on this frame
UniquePtr<SelectionDetails> details =
frameSelection->LookUpSelection(newContent, offset, 1, false);
if (!details) return;
bool normal = false;
for (SelectionDetails* sd = details.get(); sd; sd = sd->mNext.get()) {
if (sd->mSelectionType == SelectionType::eNormal) {
normal = true;
}
}
if (!normal && aContentType == nsISelectionDisplay::DISPLAY_IMAGES) {
// Don't overlay an image if it's not in the primary selection.
return;
}
aList->AppendToTop(MakeDisplayItem<nsDisplaySelectionOverlay>(
aBuilder, this, selectionValue));
}
void nsFrame::DisplayOutlineUnconditional(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
if (!StyleOutline()->ShouldPaintOutline()) {
return;
}
aLists.Outlines()->AppendToTop(
MakeDisplayItem<nsDisplayOutline>(aBuilder, this));
}
void nsFrame::DisplayOutline(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
if (!IsVisibleForPainting()) return;
DisplayOutlineUnconditional(aBuilder, aLists);
}
void nsIFrame::DisplayCaret(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList) {
if (!IsVisibleForPainting()) return;
aList->AppendToTop(MakeDisplayItem<nsDisplayCaret>(aBuilder, this));
}
nscolor nsIFrame::GetCaretColorAt(int32_t aOffset) {
return nsLayoutUtils::GetColor(this, &nsStyleUI::mCaretColor);
}
bool nsFrame::DisplayBackgroundUnconditional(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists,
bool aForceBackground) {
// Here we don't try to detect background propagation. Frames that might
// receive a propagated background should just set aForceBackground to
// true.
if (aBuilder->IsForEventDelivery() || aForceBackground ||
!StyleBackground()->IsTransparent(this) ||
StyleDisplay()->HasAppearance()) {
return nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
aBuilder, this, GetRectRelativeToSelf(), aLists.BorderBackground());
}
return false;
}
void nsFrame::DisplayBorderBackgroundOutline(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists,
bool aForceBackground) {
// The visibility check belongs here since child elements have the
// opportunity to override the visibility property and display even if
// their parent is hidden.
if (!IsVisibleForPainting()) {
return;
}
nsCSSShadowArray* shadows = StyleEffects()->mBoxShadow;
if (shadows && shadows->HasShadowWithInset(false)) {
aLists.BorderBackground()->AppendToTop(
MakeDisplayItem<nsDisplayBoxShadowOuter>(aBuilder, this));
}
bool bgIsThemed =
DisplayBackgroundUnconditional(aBuilder, aLists, aForceBackground);
if (shadows && shadows->HasShadowWithInset(true)) {
aLists.BorderBackground()->AppendToTop(
MakeDisplayItem<nsDisplayBoxShadowInner>(aBuilder, this));
}
// If there's a themed background, we should not create a border item.
// It won't be rendered.
if (!bgIsThemed && StyleBorder()->HasBorder()) {
aLists.BorderBackground()->AppendToTop(
MakeDisplayItem<nsDisplayBorder>(aBuilder, this));
}
DisplayOutlineUnconditional(aBuilder, aLists);
}
inline static bool IsSVGContentWithCSSClip(const nsIFrame* aFrame) {
// The CSS spec says that the 'clip' property only applies to absolutely
// positioned elements, whereas the SVG spec says that it applies to SVG
// elements regardless of the value of the 'position' property. Here we obey
// the CSS spec for outer-<svg> (since that's what we generally do), but
// obey the SVG spec for other SVG elements to which 'clip' applies.
return (aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) &&
aFrame->GetContent()->IsAnyOfSVGElements(nsGkAtoms::svg,
nsGkAtoms::foreignObject);
}
Maybe<nsRect> nsIFrame::GetClipPropClipRect(const nsStyleDisplay* aDisp,
const nsStyleEffects* aEffects,
const nsSize& aSize) const {
if (!(aEffects->mClipFlags & NS_STYLE_CLIP_RECT) ||
!(aDisp->IsAbsolutelyPositioned(this) || IsSVGContentWithCSSClip(this))) {
return Nothing();
}
nsRect rect = aEffects->mClip;
if (MOZ_LIKELY(StyleBorder()->mBoxDecorationBreak ==
StyleBoxDecorationBreak::Slice)) {
// The clip applies to the joined boxes so it's relative the first
// continuation.
nscoord y = 0;
for (nsIFrame* f = GetPrevContinuation(); f; f = f->GetPrevContinuation()) {
y += f->GetRect().height;
}
rect.MoveBy(nsPoint(0, -y));
}
if (NS_STYLE_CLIP_RIGHT_AUTO & aEffects->mClipFlags) {
rect.width = aSize.width - rect.x;
}
if (NS_STYLE_CLIP_BOTTOM_AUTO & aEffects->mClipFlags) {
rect.height = aSize.height - rect.y;
}
return Some(rect);
}
/**
* If the CSS 'overflow' property applies to this frame, and is not
* handled by constructing a dedicated nsHTML/XULScrollFrame, set up clipping
* for that overflow in aBuilder->ClipState() to clip all containing-block
* descendants.
*
* Return true if clipping was applied.
*/
static bool ApplyOverflowClipping(
nsDisplayListBuilder* aBuilder, const nsIFrame* aFrame,
const nsStyleDisplay* aDisp,
DisplayListClipState::AutoClipMultiple& aClipState) {
// Only -moz-hidden-unscrollable is handled here (and 'hidden' for table
// frames, and any non-visible value for blocks in a paginated context).
// We allow -moz-hidden-unscrollable to apply to any kind of frame. This
// is required by comboboxes which make their display text (an inline frame)
// have clipping.
if (!nsFrame::ShouldApplyOverflowClipping(aFrame, aDisp)) {
return false;
}
nsRect clipRect;
bool haveRadii = false;
nscoord radii[8];
auto* disp = aFrame->StyleDisplay();
// Only deflate the padding if we clip to the content-box in that axis.
auto wm = aFrame->GetWritingMode();
bool cbH = (wm.IsVertical() ? disp->mOverflowClipBoxBlock
: disp->mOverflowClipBoxInline) ==
StyleOverflowClipBox::ContentBox;
bool cbV = (wm.IsVertical() ? disp->mOverflowClipBoxInline
: disp->mOverflowClipBoxBlock) ==
StyleOverflowClipBox::ContentBox;
nsMargin bp = aFrame->GetUsedPadding();
if (!cbH) {
bp.left = bp.right = nscoord(0);
}
if (!cbV) {
bp.top = bp.bottom = nscoord(0);
}
bp += aFrame->GetUsedBorder();
bp.ApplySkipSides(aFrame->GetSkipSides());
nsRect rect(nsPoint(0, 0), aFrame->GetSize());
rect.Deflate(bp);
clipRect = rect + aBuilder->ToReferenceFrame(aFrame);
haveRadii = aFrame->GetBoxBorderRadii(radii, bp, false);
aClipState.ClipContainingBlockDescendantsExtra(clipRect,
haveRadii ? radii : nullptr);
return true;
}
#ifdef DEBUG
static void PaintDebugBorder(nsIFrame* aFrame, DrawTarget* aDrawTarget,
const nsRect& aDirtyRect, nsPoint aPt) {
nsRect r(aPt, aFrame->GetSize());
int32_t appUnitsPerDevPixel = aFrame->PresContext()->AppUnitsPerDevPixel();
Color blueOrRed(aFrame->HasView() ? Color(0.f, 0.f, 1.f, 1.f)
: Color(1.f, 0.f, 0.f, 1.f));
aDrawTarget->StrokeRect(NSRectToRect(r, appUnitsPerDevPixel),
ColorPattern(ToDeviceColor(blueOrRed)));
}
static void PaintEventTargetBorder(nsIFrame* aFrame, DrawTarget* aDrawTarget,
const nsRect& aDirtyRect, nsPoint aPt) {
nsRect r(aPt, aFrame->GetSize());
int32_t appUnitsPerDevPixel = aFrame->PresContext()->AppUnitsPerDevPixel();
ColorPattern purple(ToDeviceColor(Color(.5f, 0.f, .5f, 1.f)));
aDrawTarget->StrokeRect(NSRectToRect(r, appUnitsPerDevPixel), purple);
}
static void DisplayDebugBorders(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
const nsDisplayListSet& aLists) {
// Draw a border around the child
// REVIEW: From nsContainerFrame::PaintChild
if (nsFrame::GetShowFrameBorders() && !aFrame->GetRect().IsEmpty()) {
aLists.Outlines()->AppendToTop(MakeDisplayItem<nsDisplayGeneric>(
aBuilder, aFrame, PaintDebugBorder, "DebugBorder",
DisplayItemType::TYPE_DEBUG_BORDER));
}
// Draw a border around the current event target
if (nsFrame::GetShowEventTargetFrameBorder() &&
aFrame->PresShell()->GetDrawEventTargetFrame() == aFrame) {
aLists.Outlines()->AppendToTop(MakeDisplayItem<nsDisplayGeneric>(
aBuilder, aFrame, PaintEventTargetBorder, "EventTargetBorder",
DisplayItemType::TYPE_EVENT_TARGET_BORDER));
}
}
#endif
static bool IsScrollFrameActive(nsDisplayListBuilder* aBuilder,
nsIScrollableFrame* aScrollableFrame) {
return aScrollableFrame && aScrollableFrame->IsScrollingActive(aBuilder);
}
/**
* Returns whether a display item that gets created with the builder's current
* state will have a scrolled clip, i.e. a clip that is scrolled by a scroll
* frame which does not move the item itself.
*/
static bool BuilderHasScrolledClip(nsDisplayListBuilder* aBuilder) {
const DisplayItemClipChain* currentClip =
aBuilder->ClipState().GetCurrentCombinedClipChain(aBuilder);
if (!currentClip) {
return false;
}
const ActiveScrolledRoot* currentClipASR = currentClip->mASR;
const ActiveScrolledRoot* currentASR = aBuilder->CurrentActiveScrolledRoot();
return ActiveScrolledRoot::PickDescendant(currentClipASR, currentASR) !=
currentASR;
}
class AutoSaveRestoreContainsBlendMode {
nsDisplayListBuilder& mBuilder;
bool mSavedContainsBlendMode;
public:
explicit AutoSaveRestoreContainsBlendMode(nsDisplayListBuilder& aBuilder)
: mBuilder(aBuilder),
mSavedContainsBlendMode(aBuilder.ContainsBlendMode()) {}
~AutoSaveRestoreContainsBlendMode() {
mBuilder.SetContainsBlendMode(mSavedContainsBlendMode);
}
};
static void CheckForApzAwareEventHandlers(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame) {
if (aBuilder->GetAncestorHasApzAwareEventHandler()) {
return;
}
nsIContent* content = aFrame->GetContent();
if (!content) {
return;
}
if (content->IsNodeApzAware()) {
aBuilder->SetAncestorHasApzAwareEventHandler(true);
}
}
/**
* True if aDescendant participates the context aAncestor participating.
*/
static bool FrameParticipatesIn3DContext(nsIFrame* aAncestor,
nsIFrame* aDescendant) {
MOZ_ASSERT(aAncestor != aDescendant);
MOZ_ASSERT(aAncestor->GetContent() != aDescendant->GetContent());
MOZ_ASSERT(aAncestor->Extend3DContext());
nsIFrame* ancestor = aAncestor->FirstContinuation();
MOZ_ASSERT(ancestor->IsPrimaryFrame());
nsIFrame* frame;
for (frame = aDescendant->GetClosestFlattenedTreeAncestorPrimaryFrame();
frame && ancestor != frame;
frame = frame->GetClosestFlattenedTreeAncestorPrimaryFrame()) {
if (!frame->Extend3DContext()) {
return false;
}
}
MOZ_ASSERT(frame == ancestor);
return true;
}
static bool ItemParticipatesIn3DContext(nsIFrame* aAncestor,
nsDisplayItem* aItem) {
auto type = aItem->GetType();
if (type != DisplayItemType::TYPE_TRANSFORM &&
type != DisplayItemType::TYPE_PERSPECTIVE) {
return false;
}
nsIFrame* transformFrame = aItem->Frame();
if (aAncestor->GetContent() == transformFrame->GetContent()) {
return true;
}
return FrameParticipatesIn3DContext(aAncestor, transformFrame);
}
static void WrapSeparatorTransform(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aNonParticipants,
nsDisplayList* aParticipants, int aIndex,
nsDisplayItem** aSeparator) {
if (aNonParticipants->IsEmpty()) {
return;
}
nsDisplayTransform* item = MakeDisplayItem<nsDisplayTransform>(
aBuilder, aFrame, aNonParticipants, aBuilder->GetVisibleRect(),
Matrix4x4(), aIndex);
item->SetNoExtendContext();
if (*aSeparator == nullptr) {
*aSeparator = item;
}
aParticipants->AppendToTop(item);
}
// Try to compute a clip rect to bound the contents of the mask item
// that will be built for |aMaskedFrame|. If we're not able to compute
// one, return an empty Maybe.
// The returned clip rect, if there is one, is relative to |aMaskedFrame|.
static Maybe<nsRect> ComputeClipForMaskItem(nsDisplayListBuilder* aBuilder,
nsIFrame* aMaskedFrame) {
const nsStyleSVGReset* svgReset = aMaskedFrame->StyleSVGReset();
nsSVGUtils::MaskUsage maskUsage;
nsSVGUtils::DetermineMaskUsage(aMaskedFrame, false, maskUsage);
nsPoint offsetToUserSpace =
nsLayoutUtils::ComputeOffsetToUserSpace(aBuilder, aMaskedFrame);
int32_t devPixelRatio = aMaskedFrame->PresContext()->AppUnitsPerDevPixel();
gfxPoint devPixelOffsetToUserSpace =
nsLayoutUtils::PointToGfxPoint(offsetToUserSpace, devPixelRatio);
gfxMatrix cssToDevMatrix = nsSVGUtils::GetCSSPxToDevPxMatrix(aMaskedFrame);
nsPoint toReferenceFrame;
aBuilder->FindReferenceFrameFor(aMaskedFrame, &toReferenceFrame);
Maybe<gfxRect> combinedClip;
if (maskUsage.shouldApplyBasicShapeOrPath) {
Rect result = nsCSSClipPathInstance::GetBoundingRectForBasicShapeOrPathClip(
aMaskedFrame, svgReset->mClipPath);
combinedClip = Some(ThebesRect(result));
} else if (maskUsage.shouldApplyClipPath) {
gfxRect result = nsSVGUtils::GetBBox(
aMaskedFrame,
nsSVGUtils::eBBoxIncludeClipped | nsSVGUtils::eBBoxIncludeFill |
nsSVGUtils::eBBoxIncludeMarkers | nsSVGUtils::eBBoxIncludeStroke |
nsSVGUtils::eDoNotClipToBBoxOfContentInsideClipPath);
combinedClip = Some(cssToDevMatrix.TransformBounds(result));
} else {
// The code for this case is adapted from ComputeMaskGeometry().
nsRect borderArea(toReferenceFrame, aMaskedFrame->GetSize());
borderArea -= offsetToUserSpace;
// Use an infinite dirty rect to pass into nsCSSRendering::
// GetImageLayerClip() because we don't have an actual dirty rect to
// pass in. This is fine because the only time GetImageLayerClip() will
// not intersect the incoming dirty rect with something is in the "NoClip"
// case, and we handle that specially.
nsRect dirtyRect(nscoord_MIN / 2, nscoord_MIN / 2, nscoord_MAX,
nscoord_MAX);
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aMaskedFrame);
nsTArray<nsSVGMaskFrame*> maskFrames;
// XXX check return value?
SVGObserverUtils::GetAndObserveMasks(firstFrame, &maskFrames);
for (uint32_t i = 0; i < maskFrames.Length(); ++i) {
gfxRect clipArea;
if (maskFrames[i]) {
clipArea = maskFrames[i]->GetMaskArea(aMaskedFrame);
clipArea = cssToDevMatrix.TransformBounds(clipArea);
} else {
const auto& layer = svgReset->mMask.mLayers[i];
if (layer.mClip == StyleGeometryBox::NoClip) {
return Nothing();
}
nsCSSRendering::ImageLayerClipState clipState;
nsCSSRendering::GetImageLayerClip(
layer, aMaskedFrame, *aMaskedFrame->StyleBorder(), borderArea,
dirtyRect, false /* aWillPaintBorder */, devPixelRatio, &clipState);
clipArea = clipState.mDirtyRectInDevPx;
}
combinedClip = UnionMaybeRects(combinedClip, Some(clipArea));
}
}
if (combinedClip) {
if (combinedClip->IsEmpty()) {
// *clipForMask might be empty if all mask references are not resolvable
// or the size of them are empty. We still need to create a transparent
// mask before bug 1276834 fixed, so don't clip ctx by an empty rectangle
// for for now.
return Nothing();
}
// Convert to user space.
*combinedClip += devPixelOffsetToUserSpace;
// Round the clip out. In FrameLayerBuilder we round clips to nearest
// pixels, and if we have a really thin clip here, that can cause the
// clip to become empty if we didn't round out here.
// The rounding happens in coordinates that are relative to the reference
// frame, which matches what FrameLayerBuilder does.
combinedClip->RoundOut();
// Convert to app units.
nsRect result =
nsLayoutUtils::RoundGfxRectToAppRect(*combinedClip, devPixelRatio);
// The resulting clip is relative to the reference frame, but the caller
// expects it to be relative to the masked frame, so adjust it.
result -= toReferenceFrame;
return Some(result);
}
return Nothing();
}
struct AutoCheckBuilder {
explicit AutoCheckBuilder(nsDisplayListBuilder* aBuilder)
: mBuilder(aBuilder) {
aBuilder->Check();
}
~AutoCheckBuilder() { mBuilder->Check(); }
nsDisplayListBuilder* mBuilder;
};
/**
* Helper class to track container creation. Stores the first tracked container.
* Used to find the innermost container for hit test information, and to notify
* callers whether a container item was created or not.
*/
struct ContainerTracker {
void TrackContainer(nsDisplayItem* aContainer) {
MOZ_ASSERT(aContainer);
if (!mContainer) {
mContainer = aContainer;
}
mCreatedContainer = true;
}
void ResetCreatedContainer() { mCreatedContainer = false; }
nsDisplayItem* mContainer = nullptr;
bool mCreatedContainer = false;
};
/**
* Adds hit test information |aHitTestInfo| on the container item |aContainer|,
* or if the container item is null, creates a separate hit test item that is
* added to the bottom of the display list |aList|.
*/
static void AddHitTestInfo(nsDisplayListBuilder* aBuilder, nsDisplayList* aList,
nsDisplayItem* aContainer, nsIFrame* aFrame,
mozilla::UniquePtr<HitTestInfo>&& aHitTestInfo) {
nsDisplayHitTestInfoItem* hitTestItem;
if (aContainer) {
MOZ_ASSERT(aContainer->IsHitTestItem());
hitTestItem = static_cast<nsDisplayHitTestInfoItem*>(aContainer);
hitTestItem->SetHitTestInfo(std::move(aHitTestInfo));
} else {
// No container item was created for this frame. Create a separate
// nsDisplayCompositorHitTestInfo item instead.
hitTestItem = MakeDisplayItem<nsDisplayCompositorHitTestInfo>(
aBuilder, aFrame, std::move(aHitTestInfo));
aList->AppendToBottom(hitTestItem);
}
}
void nsIFrame::BuildDisplayListForStackingContext(
nsDisplayListBuilder* aBuilder, nsDisplayList* aList,
bool* aCreatedContainerItem) {
AutoCheckBuilder check(aBuilder);
if (GetStateBits() & NS_FRAME_TOO_DEEP_IN_FRAME_TREE) return;
// Replaced elements have their visibility handled here, because
// they're visually atomic
if (IsFrameOfType(eReplaced) && !IsVisibleForPainting()) return;
const nsStyleDisplay* disp = StyleDisplay();
const nsStyleEffects* effects = StyleEffects();
EffectSet* effectSet = EffectSet::GetEffectSet(this);
// We can stop right away if this is a zero-opacity stacking context and
// we're painting, and we're not animating opacity. Don't do this
// if we're going to compute plugin geometry, since opacity-0 plugins
// need to have display items built for them.
bool needHitTestInfo = aBuilder->BuildCompositorHitTestInfo() &&
StyleUI()->GetEffectivePointerEvents(this) !=
NS_STYLE_POINTER_EVENTS_NONE;
bool opacityItemForEventsAndPluginsOnly = false;
if (effects->mOpacity == 0.0 && aBuilder->IsForPainting() &&
!(disp->mWillChangeBitField & NS_STYLE_WILL_CHANGE_OPACITY) &&
!nsLayoutUtils::HasAnimationOfProperty(effectSet, eCSSProperty_opacity)) {
if (needHitTestInfo || aBuilder->WillComputePluginGeometry()) {
opacityItemForEventsAndPluginsOnly = true;
} else {
return;
}
}
if (disp->mWillChangeBitField != 0) {
aBuilder->AddToWillChangeBudget(this, GetSize());
}
// For preserves3d, use the dirty rect already installed on the
// builder, since aDirtyRect maybe distorted for transforms along
// the chain.
nsRect visibleRect = aBuilder->GetVisibleRect();
nsRect dirtyRect = aBuilder->GetDirtyRect();
// We build an opacity item if it's not going to be drawn by SVG content.
// We could in principle skip creating an nsDisplayOpacity item if
// nsDisplayOpacity::NeedsActiveLayer returns false and usingSVGEffects is
// true (the nsDisplayFilter/nsDisplayMasksAndClipPaths could handle the
// opacity). Since SVG has perf issues where we sometimes spend a lot of
// time creating display list items that might be helpful. We'd need to
// restore our mechanism to do that (changed in bug 1482403), and we'd
// need to invalidate the frame if the value that would be return from
// NeedsActiveLayer was to change, which we don't currently do.
const bool useOpacity = HasVisualOpacity(disp, effects, effectSet) &&
!nsSVGUtils::CanOptimizeOpacity(this);
const bool isTransformed = IsTransformed(disp);
const bool hasPerspective = isTransformed && HasPerspective(disp);
const bool extend3DContext = Extend3DContext(disp, effects, effectSet);
const bool combines3DTransformWithAncestors =
(extend3DContext || isTransformed) &&
Combines3DTransformWithAncestors(disp);
Maybe<nsDisplayListBuilder::AutoPreserves3DContext> autoPreserves3DContext;
if (extend3DContext && !combines3DTransformWithAncestors) {
// Start a new preserves3d context to keep informations on
// nsDisplayListBuilder.
autoPreserves3DContext.emplace(aBuilder);
// Save dirty rect on the builder to avoid being distorted for
// multiple transforms along the chain.
aBuilder->SavePreserves3DRect();
// We rebuild everything within preserve-3d and don't try
// to retain, so override the dirty rect now.
if (aBuilder->IsRetainingDisplayList()) {
dirtyRect = visibleRect;
aBuilder->SetDisablePartialUpdates(true);
}
}
const bool useBlendMode = effects->mMixBlendMode != NS_STYLE_BLEND_NORMAL;
if (useBlendMode) {
aBuilder->SetContainsBlendMode(true);
}
// reset blend mode so we can keep track if this stacking context needs have
// a nsDisplayBlendContainer. Set the blend mode back when the routine exits
// so we keep track if the parent stacking context needs a container too.
AutoSaveRestoreContainsBlendMode autoRestoreBlendMode(*aBuilder);
aBuilder->SetContainsBlendMode(false);
nsRect visibleRectOutsideTransform = visibleRect;
bool allowAsyncAnimation = false;
bool inTransform = aBuilder->IsInTransform();
if (isTransformed) {
const nsRect overflow = GetVisualOverflowRectRelativeToSelf();
nsDisplayTransform::PrerenderDecision decision =
nsDisplayTransform::ShouldPrerenderTransformedContent(aBuilder, this,
&dirtyRect);
switch (decision) {
case nsDisplayTransform::FullPrerender:
allowAsyncAnimation = true;
visibleRect = dirtyRect;
break;
case nsDisplayTransform::PartialPrerender:
allowAsyncAnimation = true;
visibleRect = dirtyRect;
MOZ_FALLTHROUGH;
// fall through to the NoPrerender case
case nsDisplayTransform::NoPrerender:
if (overflow.IsEmpty() && !extend3DContext) {
return;
}
// If we're in preserve-3d then grab the dirty rect that was given to
// the root and transform using the combined transform.
if (combines3DTransformWithAncestors) {
visibleRect = dirtyRect = aBuilder->GetPreserves3DRect();
}
nsRect untransformedDirtyRect;
if (nsDisplayTransform::UntransformRect(dirtyRect, overflow, this,
&untransformedDirtyRect)) {
dirtyRect = untransformedDirtyRect;
nsDisplayTransform::UntransformRect(visibleRect, overflow, this,
&visibleRect);
} else {
// This should only happen if the transform is singular, in which case
// nothing is visible anyway
dirtyRect.SetEmpty();
visibleRect.SetEmpty();
}
}
inTransform = true;
} else if (IsFixedPosContainingBlock()) {
// Restict the building area to the overflow rect for these frames, since
// RetainedDisplayListBuilder uses it to know if the size of the stacking
// context changed.
visibleRect.IntersectRect(visibleRect, GetVisualOverflowRect());
dirtyRect.IntersectRect(dirtyRect, GetVisualOverflowRect());
}
bool hasOverrideDirtyRect = false;
// If we have an override dirty region, and neither us nor our ancestors are
// modified, then use it.
if (HasOverrideDirtyRegion() && !aBuilder->InInvalidSubtree() &&
!IsFrameModified()) {
nsDisplayListBuilder::DisplayListBuildingData* data =
GetProperty(nsDisplayListBuilder::DisplayListBuildingRect());
if (data) {
dirtyRect = data->mDirtyRect.Intersect(visibleRect);
hasOverrideDirtyRect = true;
}
}
bool usingFilter = StyleEffects()->HasFilters();
bool usingMask = nsSVGIntegrationUtils::UsingMaskOrClipPathForFrame(this);
bool usingSVGEffects = usingFilter || usingMask;
nsRect visibleRectOutsideSVGEffects = visibleRect;
nsDisplayList hoistedScrollInfoItemsStorage;
if (usingSVGEffects) {
dirtyRect =
nsSVGIntegrationUtils::GetRequiredSourceForInvalidArea(this, dirtyRect);
visibleRect = nsSVGIntegrationUtils::GetRequiredSourceForInvalidArea(
this, visibleRect);
aBuilder->EnterSVGEffectsContents(&hoistedScrollInfoItemsStorage);
}
bool useStickyPosition =
disp->mPosition == NS_STYLE_POSITION_STICKY &&
IsScrollFrameActive(
aBuilder,
nsLayoutUtils::GetNearestScrollableFrame(
GetParent(), nsLayoutUtils::SCROLLABLE_SAME_DOC |
nsLayoutUtils::SCROLLABLE_INCLUDE_HIDDEN));
bool useFixedPosition = disp->mPosition == NS_STYLE_POSITION_FIXED &&
(nsLayoutUtils::IsFixedPosFrameInDisplayPort(this) ||
BuilderHasScrolledClip(aBuilder));
nsDisplayListBuilder::AutoBuildingDisplayList buildingDisplayList(
aBuilder, this, visibleRect, dirtyRect, true);
// Depending on the effects that are applied to this frame, we can create
// multiple container display items and wrap them around our contents.
// This enum lists all the potential container display items, in the order
// outside to inside.
enum class ContainerItemType : uint8_t {
eNone = 0,
eOwnLayerIfNeeded,
eBlendMode,
eFixedPosition,
eOwnLayerForTransformWithRoundedClip,
ePerspective,
eTransform,
eSeparatorTransforms,
eOpacity,
eFilter,
eBlendContainer
};
nsDisplayListBuilder::AutoContainerASRTracker contASRTracker(aBuilder);
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
// If there is a current clip, then depending on the container items we
// create, different things can happen to it. Some container items simply
// propagate the clip to their children and aren't clipped themselves.
// But other container items, especially those that establish a different
// geometry for their contents (e.g. transforms), capture the clip on
// themselves and unset the clip for their contents. If we create more than
// one of those container items, the clip will be captured on the outermost
// one and the inner container items will be unclipped.
ContainerItemType clipCapturedBy = ContainerItemType::eNone;
if (useFixedPosition) {
clipCapturedBy = ContainerItemType::eFixedPosition;
} else if (isTransformed) {
const DisplayItemClipChain* currentClip =
aBuilder->ClipState().GetCurrentCombinedClipChain(aBuilder);
if ((hasPerspective || extend3DContext) &&
(currentClip && currentClip->HasRoundedCorners())) {
// If we're creating an nsDisplayTransform item that is going to combine
// its transform with its children (preserve-3d or perspective), then we
// can't have an intermediate surface. Mask layers force an intermediate
// surface, so if we're going to need both then create a separate
// wrapping layer for the mask.
clipCapturedBy = ContainerItemType::eOwnLayerForTransformWithRoundedClip;
} else if (hasPerspective) {
clipCapturedBy = ContainerItemType::ePerspective;
} else {
clipCapturedBy = ContainerItemType::eTransform;
}
} else if (usingFilter) {
clipCapturedBy = ContainerItemType::eFilter;
}
if (clipCapturedBy != ContainerItemType::eNone) {
clipState.Clear();
}
Maybe<nsRect> clipForMask;
if (usingMask) {
clipForMask = ComputeClipForMaskItem(aBuilder, this);
}
mozilla::UniquePtr<HitTestInfo> hitTestInfo;
nsDisplayListCollection set(aBuilder);
{
DisplayListClipState::AutoSaveRestore nestedClipState(aBuilder);
nsDisplayListBuilder::AutoInTransformSetter inTransformSetter(aBuilder,
inTransform);
nsDisplayListBuilder::AutoEnterFilter filterASRSetter(aBuilder,
usingFilter);
CheckForApzAwareEventHandlers(aBuilder, this);
Maybe<nsRect> contentClip = GetClipPropClipRect(disp, effects, GetSize());
if (usingMask) {
contentClip = IntersectMaybeRects(contentClip, clipForMask);
}
if (contentClip) {
aBuilder->IntersectDirtyRect(*contentClip);
aBuilder->IntersectVisibleRect(*contentClip);
nestedClipState.ClipContentDescendants(*contentClip +
aBuilder->ToReferenceFrame(this));
}
// extend3DContext also guarantees that applyAbsPosClipping and
// usingSVGEffects are false We only modify the preserve-3d rect if we are
// the top of a preserve-3d heirarchy
if (extend3DContext) {
// Mark these first so MarkAbsoluteFramesForDisplayList knows if we are
// going to be forced to descend into frames.
aBuilder->MarkPreserve3DFramesForDisplayList(this);
}
aBuilder->AdjustWindowDraggingRegion(this);
if (gfxVars::UseWebRender()) {
aBuilder->BuildCompositorHitTestInfoIfNeeded(this, set.BorderBackground(),
true);
} else {
CompositorHitTestInfo info = aBuilder->BuildCompositorHitTestInfo()
? GetCompositorHitTestInfo(aBuilder)
: CompositorHitTestInvisibleToHit;
if (info != CompositorHitTestInvisibleToHit) {
// Frame has hit test flags set, initialize the hit test info structure.
hitTestInfo = mozilla::MakeUnique<HitTestInfo>(aBuilder, this, info);
// Let child frames know the current hit test area and hit test flags.
aBuilder->SetCompositorHitTestInfo(hitTestInfo->mArea,
hitTestInfo->mFlags);
}
}
MarkAbsoluteFramesForDisplayList(aBuilder);
aBuilder->Check();
BuildDisplayList(aBuilder, set);
aBuilder->Check();
aBuilder->DisplayCaret(this, set.Content());
// Blend modes are a real pain for retained display lists. We build a blend
// container item if the built list contains any blend mode items within
// the current stacking context. This can change without an invalidation
// to the stacking context frame, or the blend mode frame (e.g. by moving
// an intermediate frame).
// When we gain/remove a blend container item, we need to mark this frame
// as invalid and have the full display list for merging to track
// the change correctly.
// It seems really hard to track this in advance, as the bookkeeping
// required to note which stacking contexts have blend descendants
// is complex and likely to be buggy.
// Instead we're doing the sad thing, detecting it afterwards, and just
// repeating display list building if it changed.
// We have to repeat building for the entire display list (or at least
// the outer stacking context), since we need to mark this frame as invalid
// to remove any existing content that isn't wrapped in the blend container,
// and then we need to build content infront/behind the blend container
// to get correct positioning during merging.
if (aBuilder->ContainsBlendMode() && aBuilder->IsRetainingDisplayList()) {
if (!aBuilder->GetDirtyRect().Contains(aBuilder->GetVisibleRect())) {
aBuilder->SetPartialBuildFailed(true);
} else {
aBuilder->SetDisablePartialUpdates(true);
}
}
}
if (aBuilder->IsBackgroundOnly()) {
set.BlockBorderBackgrounds()->DeleteAll(aBuilder);
set.Floats()->DeleteAll(aBuilder);
set.Content()->DeleteAll(aBuilder);
set.PositionedDescendants()->DeleteAll(aBuilder);
set.Outlines()->DeleteAll(aBuilder);
}
if (hasOverrideDirtyRect && gfxPrefs::LayoutDisplayListShowArea()) {
nsDisplaySolidColor* color = MakeDisplayItem<nsDisplaySolidColor>(
aBuilder, this,
dirtyRect + aBuilder->GetCurrentFrameOffsetToReferenceFrame(),
NS_RGBA(255, 0, 0, 64), false);
color->SetOverrideZIndex(INT32_MAX);
set.PositionedDescendants()->AppendToTop(color);
}
// Sort PositionedDescendants() in CSS 'z-order' order. The list is already
// in content document order and SortByZOrder is a stable sort which
// guarantees that boxes produced by the same element are placed together
// in the sort. Consider a position:relative inline element that breaks
// across lines and has absolutely positioned children; all the abs-pos
// children should be z-ordered after all the boxes for the position:relative
// element itself.
set.PositionedDescendants()->SortByZOrder();
nsDisplayList resultList;
// Now follow the rules of http://www.w3.org/TR/CSS21/zindex.html
// 1,2: backgrounds and borders
resultList.AppendToTop(set.BorderBackground());
// 3: negative z-index children.
for (;;) {
nsDisplayItem* item = set.PositionedDescendants()->GetBottom();
if (item && item->ZIndex() < 0) {
set.PositionedDescendants()->RemoveBottom();
resultList.AppendToTop(item);
continue;
}
break;
}
// 4: block backgrounds
resultList.AppendToTop(set.BlockBorderBackgrounds());
// 5: floats
resultList.AppendToTop(set.Floats());
// 7: general content
resultList.AppendToTop(set.Content());
// 7.5: outlines, in content tree order. We need to sort by content order
// because an element with outline that breaks and has children with outline
// might have placed child outline items between its own outline items.
// The element's outline items need to all come before any child outline
// items.
nsIContent* content = GetContent();
if (!content) {
content = PresContext()->Document()->GetRootElement();
}
if (content) {
set.Outlines()->SortByContentOrder(content);
}
#ifdef DEBUG
DisplayDebugBorders(aBuilder, this, set);
#endif
resultList.AppendToTop(set.Outlines());
// 8, 9: non-negative z-index children
resultList.AppendToTop(set.PositionedDescendants());
// Get the ASR to use for the container items that we create here.
const ActiveScrolledRoot* containerItemASR = contASRTracker.GetContainerASR();
ContainerTracker ct;
/* If adding both a nsDisplayBlendContainer and a nsDisplayBlendMode to the
* same list, the nsDisplayBlendContainer should be added first. This only
* happens when the element creating this stacking context has mix-blend-mode
* and also contains a child which has mix-blend-mode.
* The nsDisplayBlendContainer must be added to the list first, so it does not
* isolate the containing element blending as well.
*/
if (aBuilder->ContainsBlendMode()) {
DisplayListClipState::AutoSaveRestore blendContainerClipState(aBuilder);
resultList.AppendToTop(nsDisplayBlendContainer::CreateForMixBlendMode(
aBuilder, this, &resultList, containerItemASR));
ct.TrackContainer(resultList.GetTop());
}
/* If there are any SVG effects, wrap the list up in an SVG effects item
* (which also handles CSS group opacity). Note that we create an SVG effects
* item even if resultList is empty, since a filter can produce graphical
* output even if the element being filtered wouldn't otherwise do so.
*/
if (usingSVGEffects) {
MOZ_ASSERT(usingFilter || usingMask,
"Beside filter & mask/clip-path, what else effect do we have?");
if (clipCapturedBy == ContainerItemType::eFilter) {
clipState.Restore();
}
// Revert to the post-filter dirty rect.
aBuilder->SetVisibleRect(visibleRectOutsideSVGEffects);
// Skip all filter effects while generating glyph mask.
if (usingFilter && !aBuilder->IsForGenerateGlyphMask()) {
/* List now emptied, so add the new list to the top. */
resultList.AppendToTop(
MakeDisplayItem<nsDisplayFilters>(aBuilder, this, &resultList));
ct.TrackContainer(resultList.GetTop());
}
if (usingMask) {
DisplayListClipState::AutoSaveRestore maskClipState(aBuilder);
// The mask should move with aBuilder->CurrentActiveScrolledRoot(), so
// that's the ASR we prefer to use for the mask item. However, we can
// only do this if the mask if clipped with respect to that ASR, because
// an item always needs to have finite bounds with respect to its ASR.
// If we weren't able to compute a clip for the mask, we fall back to
// using containerItemASR, which is the lowest common ancestor clip of
// the mask's contents. That's not entirely correct, but it satisfies
// the base requirement of the ASR system (that items have finite bounds
// wrt. their ASR).
const ActiveScrolledRoot* maskASR =
clipForMask.isSome() ? aBuilder->CurrentActiveScrolledRoot()
: containerItemASR;
/* List now emptied, so add the new list to the top. */
resultList.AppendToTop(MakeDisplayItem<nsDisplayMasksAndClipPaths>(
aBuilder, this, &resultList, maskASR));
ct.TrackContainer(resultList.GetTop());
}
// TODO(miko): We could probably create a wraplist here and avoid creating
// it later in |BuildDisplayListForChild()|.
ct.ResetCreatedContainer();
// Also add the hoisted scroll info items. We need those for APZ scrolling
// because nsDisplayMasksAndClipPaths items can't build active layers.
aBuilder->ExitSVGEffectsContents();
resultList.AppendToTop(&hoistedScrollInfoItemsStorage);
}
/* If the list is non-empty and there is CSS group opacity without SVG
* effects, wrap it up in an opacity item.
*/
if (useOpacity) {
// Don't clip nsDisplayOpacity items. We clip their descendants instead.
// The clip we would set on an element with opacity would clip
// all descendant content, but some should not be clipped.
DisplayListClipState::AutoSaveRestore opacityClipState(aBuilder);
const bool needsActiveOpacityLayer =
nsDisplayOpacity::NeedsActiveLayer(aBuilder, this);
resultList.AppendToTop(MakeDisplayItem<nsDisplayOpacity>(
aBuilder, this, &resultList, containerItemASR,
opacityItemForEventsAndPluginsOnly, needsActiveOpacityLayer));
ct.TrackContainer(resultList.GetTop());
}
/* If we're going to apply a transformation and don't have preserve-3d set,
* wrap everything in an nsDisplayTransform. If there's nothing in the list,
* don't add anything.
*
* For the preserve-3d case we want to individually wrap every child in the
* list with a separate nsDisplayTransform instead. When the child is already
* an nsDisplayTransform, we can skip this step, as the computed transform
* will already include our own.
*
* We also traverse into sublists created by nsDisplayWrapList, so that we
* find all the correct children.
*/
if (isTransformed && extend3DContext) {
// Install dummy nsDisplayTransform as a leaf containing
// descendants not participating this 3D rendering context.
nsDisplayList nonparticipants;
nsDisplayList participants;
int index = 1;
nsDisplayItem* separator = nullptr;
while (nsDisplayItem* item = resultList.RemoveBottom()) {
if (ItemParticipatesIn3DContext(this, item) &&
!item->GetClip().HasClip()) {
// The frame of this item participates the same 3D context.
WrapSeparatorTransform(aBuilder, this, &nonparticipants, &participants,
index++, &separator);
participants.AppendToTop(item);
} else {
// The frame of the item doesn't participate the current
// context, or has no transform.
//
// For items participating but not transformed, they are add
// to nonparticipants to get a separator layer for handling
// clips, if there is, on an intermediate surface.
// \see ContainerLayer::DefaultComputeEffectiveTransforms().
nonparticipants.AppendToTop(item);
}
}
WrapSeparatorTransform(aBuilder, this, &nonparticipants, &participants,
index++, &separator);
if (separator) {
ct.TrackContainer(separator);
}
resultList.AppendToTop(&participants);
}
if (isTransformed) {
if (clipCapturedBy == ContainerItemType::eTransform) {
// Restore clip state now so nsDisplayTransform is clipped properly.
clipState.Restore();
}
// Revert to the dirtyrect coming in from the parent, without our transform
// taken into account.
aBuilder->SetVisibleRect(visibleRectOutsideTransform);
// Revert to the outer reference frame and offset because all display
// items we create from now on are outside the transform.
nsPoint toOuterReferenceFrame;
const nsIFrame* outerReferenceFrame = this;
if (this != aBuilder->RootReferenceFrame()) {
outerReferenceFrame =
aBuilder->FindReferenceFrameFor(GetParent(), &toOuterReferenceFrame);
}
buildingDisplayList.SetReferenceFrameAndCurrentOffset(
outerReferenceFrame, GetOffsetToCrossDoc(outerReferenceFrame));
nsDisplayTransform* transformItem = MakeDisplayItem<nsDisplayTransform>(
aBuilder, this, &resultList, visibleRect, 0, allowAsyncAnimation);
resultList.AppendToTop(transformItem);
ct.TrackContainer(transformItem);
if (hasPerspective) {
if (clipCapturedBy == ContainerItemType::ePerspective) {
clipState.Restore();
}
resultList.AppendToTop(
MakeDisplayItem<nsDisplayPerspective>(aBuilder, this, &resultList));
ct.TrackContainer(resultList.GetTop());
}
}
if (clipCapturedBy ==
ContainerItemType::eOwnLayerForTransformWithRoundedClip) {
clipState.Restore();
resultList.AppendToTop(MakeDisplayItem<nsDisplayOwnLayer>(
aBuilder, this, &resultList, aBuilder->CurrentActiveScrolledRoot(),
nsDisplayOwnLayerFlags::eNone, ScrollbarData{},
/* aForceActive = */ false));
ct.TrackContainer(resultList.GetTop());
}
/* If we have sticky positioning, wrap it in a sticky position item.
*/
if (useFixedPosition) {
if (clipCapturedBy == ContainerItemType::eFixedPosition) {
clipState.Restore();
}
// The ASR for the fixed item should be the ASR of our containing block,
// which has been set as the builder's current ASR, unless this frame is
// invisible and we hadn't saved display item data for it. In that case,
// we need to take the containerItemASR since we might have fixed children.
// For WebRender, we want to the know what |containerItemASR| is for the
// case where the fixed-pos item is not a "real" fixed-pos item (e.g. it's
// nested inside a scrolling transform), so we stash that on the display
// item as well.
const ActiveScrolledRoot* fixedASR = ActiveScrolledRoot::PickAncestor(
containerItemASR, aBuilder->CurrentActiveScrolledRoot());
resultList.AppendToTop(MakeDisplayItem<nsDisplayFixedPosition>(
aBuilder, this, &resultList, fixedASR, containerItemASR));
ct.TrackContainer(resultList.GetTop());
} else if (useStickyPosition) {
// For position:sticky, the clip needs to be applied both to the sticky
// container item and to the contents. The container item needs the clip
// because a scrolled clip needs to move independently from the sticky
// contents, and the contents need the clip so that they have finite
// clipped bounds with respect to the container item's ASR. The latter is
// a little tricky in the case where the sticky item has both fixed and
// non-fixed descendants, because that means that the sticky container
// item's ASR is the ASR of the fixed descendant.
// For WebRender display list building, though, we still want to know the
// the ASR that the sticky container item would normally have, so we stash
// that on the display item as the "container ASR" (i.e. the normal ASR of
// the container item, excluding the special behaviour induced by fixed
// descendants).
const ActiveScrolledRoot* stickyASR = ActiveScrolledRoot::PickAncestor(
containerItemASR, aBuilder->CurrentActiveScrolledRoot());
resultList.AppendToTop(MakeDisplayItem<nsDisplayStickyPosition>(
aBuilder, this, &resultList, stickyASR,
aBuilder->CurrentActiveScrolledRoot()));
ct.TrackContainer(resultList.GetTop());
}
/* If there's blending, wrap up the list in a blend-mode item. Note
* that opacity can be applied before blending as the blend color is
* not affected by foreground opacity (only background alpha).
*/
if (useBlendMode) {
DisplayListClipState::AutoSaveRestore blendModeClipState(aBuilder);
resultList.AppendToTop(MakeDisplayItem<nsDisplayBlendMode>(
aBuilder, this, &resultList, effects->mMixBlendMode, containerItemASR));
ct.TrackContainer(resultList.GetTop());
}
bool createdOwnLayer = false;
CreateOwnLayerIfNeeded(aBuilder, &resultList, &createdOwnLayer);
if (createdOwnLayer) {
ct.TrackContainer(resultList.GetTop());
}
if (aCreatedContainerItem) {
*aCreatedContainerItem = ct.mCreatedContainer;
}
if (hitTestInfo) {
// WebRender support is not yet implemented.
MOZ_ASSERT(!gfxVars::UseWebRender());
AddHitTestInfo(aBuilder, &resultList, ct.mContainer, this,
std::move(hitTestInfo));
}
aList->AppendToTop(&resultList);
}
static nsDisplayItem* WrapInWrapList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
const ActiveScrolledRoot* aContainerASR,
bool aCanSkipWrapList = false) {
nsDisplayItem* item = aList->GetBottom();
if (!item) {
return nullptr;
}
if (aCanSkipWrapList) {
MOZ_ASSERT(!item->GetAbove());
aList->RemoveBottom();
return item;
}
// Clear clip rect for the construction of the items below. Since we're
// clipping all their contents, they themselves don't need to be clipped.
return MakeDisplayItem<nsDisplayWrapList>(aBuilder, aFrame, aList,
aContainerASR, true);
}
/**
* Check if a frame should be visited for building display list.
*/
static bool DescendIntoChild(nsDisplayListBuilder* aBuilder,
const nsIFrame* aChild, const nsRect& aVisible,
const nsRect& aDirty) {
if (aChild->GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO) {
return true;
}
// If the child is a scrollframe that we want to ignore, then we need
// to descend into it because its scrolled child may intersect the dirty
// area even if the scrollframe itself doesn't.
if (aChild == aBuilder->GetIgnoreScrollFrame()) {
return true;
}
// There are cases where the "ignore scroll frame" on the builder is not set
// correctly, and so we additionally want to catch cases where the child is
// a root scrollframe and we are ignoring scrolling on the viewport.
if (aChild == aBuilder->GetPresShellIgnoreScrollFrame()) {
return true;
}
const nsRect overflow = aChild->GetVisualOverflowRect();
if (aDirty.Intersects(overflow)) {
return true;
}
if (aChild->ForceDescendIntoIfVisible() && aVisible.Intersects(overflow)) {
return true;
}
return false;
}
void nsIFrame::BuildDisplayListForSimpleChild(nsDisplayListBuilder* aBuilder,
nsIFrame* aChild,
const nsDisplayListSet& aLists) {
// This is the shortcut for frames been handled along the common
// path, the most common one of THE COMMON CASE mentioned later.
MOZ_ASSERT(aChild->Type() != LayoutFrameType::Placeholder);
MOZ_ASSERT(!aBuilder->GetSelectedFramesOnly() &&
!aBuilder->GetIncludeAllOutOfFlows(),
"It should be held for painting to window");
MOZ_ASSERT(aChild->GetStateBits() & NS_FRAME_SIMPLE_DISPLAYLIST);
const nsPoint offset = aChild->GetOffsetTo(this);
const nsRect visible = aBuilder->GetVisibleRect() - offset;
const nsRect dirty = aBuilder->GetDirtyRect() - offset;
if (!DescendIntoChild(aBuilder, aChild, visible, dirty)) {
return;
}
nsDisplayListBuilder::AutoBuildingDisplayList buildingForChild(
aBuilder, aChild, visible, dirty, false);
CheckForApzAwareEventHandlers(aBuilder, aChild);
aBuilder->BuildCompositorHitTestInfoIfNeeded(
aChild, aLists.BorderBackground(), false);
aChild->MarkAbsoluteFramesForDisplayList(aBuilder);
aBuilder->AdjustWindowDraggingRegion(aChild);
aBuilder->Check();
aChild->BuildDisplayList(aBuilder, aLists);
aBuilder->Check();
aBuilder->DisplayCaret(aChild, aLists.Content());
#ifdef DEBUG
DisplayDebugBorders(aBuilder, aChild, aLists);
#endif
}
static bool ShouldSkipFrame(nsDisplayListBuilder* aBuilder,
const nsIFrame* aFrame) {
// If painting is restricted to just the background of the top level frame,
// then we have nothing to do here.
if (aBuilder->IsBackgroundOnly()) {
return true;
}
if ((aBuilder->IsForGenerateGlyphMask() ||
aBuilder->IsForPaintingSelectionBG()) &&
(!aFrame->IsTextFrame() && aFrame->IsLeaf())) {
return true;
}
// The placeholder frame should have the same content as the OOF frame.
if (aBuilder->GetSelectedFramesOnly() &&
(aFrame->IsLeaf() && !aFrame->IsSelected())) {
return true;
}
static const nsFrameState skipFlags =
(NS_FRAME_TOO_DEEP_IN_FRAME_TREE | NS_FRAME_IS_NONDISPLAY);
return (aFrame->GetStateBits() & skipFlags);
}
void nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
nsIFrame* aChild,
const nsDisplayListSet& aLists,
uint32_t aFlags) {
AutoCheckBuilder check(aBuilder);
if (ShouldSkipFrame(aBuilder, aChild)) {
return;
}
nsIFrame* child = aChild;
aBuilder->RemoveFromWillChangeBudget(child);
const bool isPaintingToWindow = aBuilder->IsPaintingToWindow();
const bool doingShortcut =
isPaintingToWindow &&
(child->GetStateBits() & NS_FRAME_SIMPLE_DISPLAYLIST) &&
// Animations may change the stacking context state.
!(child->MayHaveTransformAnimation() || child->MayHaveOpacityAnimation());
if (doingShortcut) {
BuildDisplayListForSimpleChild(aBuilder, child, aLists);
return;
}
// dirty rect in child-relative coordinates
NS_ASSERTION(aBuilder->GetCurrentFrame() == this, "Wrong coord space!");
const nsPoint offset = child->GetOffsetTo(this);
nsRect visible = aBuilder->GetVisibleRect() - offset;
nsRect dirty = aBuilder->GetDirtyRect() - offset;
nsDisplayListBuilder::OutOfFlowDisplayData* savedOutOfFlowData = nullptr;
const bool isPlaceholder = child->IsPlaceholderFrame();
if (isPlaceholder) {
nsPlaceholderFrame* placeholder = static_cast<nsPlaceholderFrame*>(child);
if (placeholder->GetStateBits() & PLACEHOLDER_FOR_TOPLAYER) {
// If the out-of-flow frame is in the top layer, the viewport frame
// will paint it. Skip it here. Note that, only out-of-flow frames
// with this property should be skipped, because non-HTML elements
// may stop their children from being out-of-flow. Those frames
// should still be handled in the normal in-flow path.
return;
}
child = placeholder->GetOutOfFlowFrame();
NS_ASSERTION(child, "No out of flow frame?");
if (child) {
aBuilder->RemoveFromWillChangeBudget(child);
}
// If 'child' is a pushed float then it's owned by a block that's not an
// ancestor of the placeholder, and it will be painted by that block and
// should not be painted through the placeholder. Also recheck
// NS_FRAME_TOO_DEEP_IN_FRAME_TREE and NS_FRAME_IS_NONDISPLAY.
static const nsFrameState skipFlags =
(NS_FRAME_IS_PUSHED_FLOAT | NS_FRAME_TOO_DEEP_IN_FRAME_TREE |
NS_FRAME_IS_NONDISPLAY);
if (!child || (child->GetStateBits() & skipFlags) ||
nsLayoutUtils::IsPopup(child)) {
return;
}
MOZ_ASSERT(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW);
savedOutOfFlowData = nsDisplayListBuilder::GetOutOfFlowData(child);
if (aBuilder->GetIncludeAllOutOfFlows()) {
visible = child->GetVisualOverflowRect();
dirty = child->GetVisualOverflowRect();
} else if (savedOutOfFlowData) {
visible =
savedOutOfFlowData->GetVisibleRectForFrame(aBuilder, child, &dirty);
} else {
// The out-of-flow frame did not intersect the dirty area. We may still
// need to traverse into it, since it may contain placeholders we need
// to enter to reach other out-of-flow frames that are visible.
visible.SetEmpty();
dirty.SetEmpty();
}
}
NS_ASSERTION(!child->IsPlaceholderFrame(),
"Should have dealt with placeholders already");
if (!DescendIntoChild(aBuilder, child, visible, dirty)) {
return;
}
const bool isSVG = child->GetStateBits() & NS_FRAME_SVG_LAYOUT;
// This flag is raised if the control flow strays off the common path.
// The common path is the most common one of THE COMMON CASE mentioned later.
bool awayFromCommonPath = !isPaintingToWindow;
// true if this is a real or pseudo stacking context
bool pseudoStackingContext =
(aFlags & DISPLAY_CHILD_FORCE_PSEUDO_STACKING_CONTEXT) != 0;
if (!pseudoStackingContext && !isSVG && (aFlags & DISPLAY_CHILD_INLINE) &&
!child->IsFrameOfType(eLineParticipant)) {
// child is a non-inline frame in an inline context, i.e.,
// it acts like inline-block or inline-table. Therefore it is a
// pseudo-stacking-context.
pseudoStackingContext = true;
}
const nsStyleDisplay* ourDisp = StyleDisplay();
// REVIEW: Taken from nsBoxFrame::Paint
// Don't paint our children if the theme object is a leaf.
if (IsThemed(ourDisp) &&
!PresContext()->GetTheme()->WidgetIsContainer(ourDisp->mAppearance))
return;
// Since we're now sure that we're adding this frame to the display list
// (which means we're painting it, modulo occlusion), mark it as visible
// within the displayport.
if (isPaintingToWindow && child->TrackingVisibility()) {
child->PresShell()->EnsureFrameInApproximatelyVisibleList(child);
awayFromCommonPath = true;
}
child->SetBuiltDisplayList(true);
// Child is composited if it's transformed, partially transparent, or has
// SVG effects or a blend mode..
const nsStyleDisplay* disp = child->StyleDisplay();
const nsStyleEffects* effects = child->StyleEffects();
const nsStylePosition* pos = child->StylePosition();
const bool isPositioned = disp->IsAbsPosContainingBlock(child);
const bool isStackingContext =
child->IsStackingContext(disp, pos, effects, isPositioned) ||
(aFlags & DISPLAY_CHILD_FORCE_STACKING_CONTEXT);
if (pseudoStackingContext || isStackingContext || isPositioned ||
isPlaceholder || (!isSVG && disp->IsFloating(child)) ||
(isSVG && (effects->mClipFlags & NS_STYLE_CLIP_RECT) &&
IsSVGContentWithCSSClip(child))) {
pseudoStackingContext = true;
awayFromCommonPath = true;
}
NS_ASSERTION(!isStackingContext || pseudoStackingContext,
"Stacking contexts must also be pseudo-stacking-contexts");
nsDisplayListBuilder::AutoBuildingDisplayList buildingForChild(
aBuilder, child, visible, dirty, pseudoStackingContext);
DisplayListClipState::AutoClipMultiple clipState(aBuilder);
nsDisplayListBuilder::AutoCurrentActiveScrolledRootSetter asrSetter(aBuilder);
CheckForApzAwareEventHandlers(aBuilder, child);
if (savedOutOfFlowData) {
aBuilder->SetBuildingInvisibleItems(false);
clipState.SetClipChainForContainingBlockDescendants(
savedOutOfFlowData->mContainingBlockClipChain);
asrSetter.SetCurrentActiveScrolledRoot(
savedOutOfFlowData->mContainingBlockActiveScrolledRoot);
MOZ_ASSERT(awayFromCommonPath,
"It is impossible when savedOutOfFlowData is true");
} else if (GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO &&
isPlaceholder) {
NS_ASSERTION(visible.IsEmpty(), "should have empty visible rect");
// Every item we build from now until we descent into an out of flow that
// does have saved out of flow data should be invisible. This state gets
// restored when AutoBuildingDisplayList gets out of scope.
aBuilder->SetBuildingInvisibleItems(true);
// If we have nested out-of-flow frames and the outer one isn't visible
// then we won't have stored clip data for it. We can just clear the clip
// instead since we know we won't render anything, and the inner out-of-flow
// frame will setup the correct clip for itself.
clipState.SetClipChainForContainingBlockDescendants(nullptr);
}
// Setup clipping for the parent's overflow:-moz-hidden-unscrollable,
// or overflow:hidden on elements that don't support scrolling (and therefore
// don't create nsHTML/XULScrollFrame). This clipping needs to not clip
// anything directly rendered by the parent, only the rendering of its
// children.
// Don't use overflowClip to restrict the dirty rect, since some of the
// descendants may not be clipped by it. Even if we end up with unnecessary
// display items, they'll be pruned during ComputeVisibility.
nsIFrame* parent = child->GetParent();
const nsStyleDisplay* parentDisp =
parent == this ? ourDisp : parent->StyleDisplay();
if (ApplyOverflowClipping(aBuilder, parent, parentDisp, clipState)) {
awayFromCommonPath = true;
}
nsDisplayList list;
nsDisplayList extraPositionedDescendants;
const ActiveScrolledRoot* wrapListASR;
bool canSkipWrapList = false;
if (isStackingContext) {
// True stacking context.
// For stacking contexts, BuildDisplayListForStackingContext handles
// clipping and MarkAbsoluteFramesForDisplayList.
nsDisplayListBuilder::AutoContainerASRTracker contASRTracker(aBuilder);
child->BuildDisplayListForStackingContext(aBuilder, &list,
&canSkipWrapList);
wrapListASR = contASRTracker.GetContainerASR();
if (aBuilder->GetCaretFrame() == child) {
canSkipWrapList = false;
}
} else {
Maybe<nsRect> clipPropClip =
child->GetClipPropClipRect(disp, effects, child->GetSize());
if (clipPropClip) {
aBuilder->IntersectVisibleRect(*clipPropClip);
aBuilder->IntersectDirtyRect(*clipPropClip);
clipState.ClipContentDescendants(*clipPropClip +
aBuilder->ToReferenceFrame(child));
awayFromCommonPath = true;
}
child->MarkAbsoluteFramesForDisplayList(aBuilder);
const bool differentAGR =
buildingForChild.IsAnimatedGeometryRoot() || isPositioned;
if (!awayFromCommonPath && !differentAGR &&
!buildingForChild.MaybeAnimatedGeometryRoot()) {
// The shortcut is available for the child for next time.
child->AddStateBits(NS_FRAME_SIMPLE_DISPLAYLIST);
}
if (!pseudoStackingContext) {
// THIS IS THE COMMON CASE.
// Not a pseudo or real stacking context. Do the simple thing and
// return early.
aBuilder->BuildCompositorHitTestInfoIfNeeded(
child, aLists.BorderBackground(), differentAGR);
aBuilder->AdjustWindowDraggingRegion(child);
aBuilder->Check();
child->BuildDisplayList(aBuilder, aLists);
aBuilder->Check();
aBuilder->DisplayCaret(child, aLists.Content());
#ifdef DEBUG
DisplayDebugBorders(aBuilder, child, aLists);
#endif
return;
}
// A pseudo-stacking context (e.g., a positioned element with z-index auto).
// We allow positioned descendants of the child to escape to our parent
// stacking context's positioned descendant list, because they might be
// z-index:non-auto
nsDisplayListCollection pseudoStack(aBuilder);
aBuilder->BuildCompositorHitTestInfoIfNeeded(
child, pseudoStack.BorderBackground(), differentAGR);
aBuilder->AdjustWindowDraggingRegion(child);
nsDisplayListBuilder::AutoContainerASRTracker contASRTracker(aBuilder);
aBuilder->Check();
child->BuildDisplayList(aBuilder, pseudoStack);
aBuilder->Check();
if (aBuilder->DisplayCaret(child, pseudoStack.Content())) {
canSkipWrapList = false;
}
wrapListASR = contASRTracker.GetContainerASR();
list.AppendToTop(pseudoStack.BorderBackground());
list.AppendToTop(pseudoStack.BlockBorderBackgrounds());
list.AppendToTop(pseudoStack.Floats());
list.AppendToTop(pseudoStack.Content());
list.AppendToTop(pseudoStack.Outlines());
extraPositionedDescendants.AppendToTop(pseudoStack.PositionedDescendants());
#ifdef DEBUG
DisplayDebugBorders(aBuilder, child, aLists);
#endif
}
buildingForChild.RestoreBuildingInvisibleItemsValue();
if (isPositioned || isStackingContext ||
(aFlags & DISPLAY_CHILD_FORCE_STACKING_CONTEXT)) {
// Genuine stacking contexts, and positioned pseudo-stacking-contexts,
// go in this level.
if (!list.IsEmpty()) {
nsDisplayItem* item =
WrapInWrapList(aBuilder, child, &list, wrapListASR, canSkipWrapList);
if (isSVG) {
aLists.Content()->AppendToTop(item);
} else {
aLists.PositionedDescendants()->AppendToTop(item);
}
}
} else if (!isSVG && disp->IsFloating(child)) {
if (!list.IsEmpty()) {
aLists.Floats()->AppendToTop(
WrapInWrapList(aBuilder, child, &list, wrapListASR));
}
} else {
aLists.Content()->AppendToTop(&list);
}
// We delay placing the positioned descendants of positioned frames to here,
// because in the absence of z-index this is the correct order for them.
// This doesn't affect correctness because the positioned descendants list
// is sorted by z-order and content in BuildDisplayListForStackingContext,
// but it means that sort routine needs to do less work.
aLists.PositionedDescendants()->AppendToTop(&extraPositionedDescendants);
}
void nsIFrame::MarkAbsoluteFramesForDisplayList(
nsDisplayListBuilder* aBuilder) {
if (IsAbsoluteContainer()) {
aBuilder->MarkFramesForDisplayList(
this, GetAbsoluteContainingBlock()->GetChildList());
}
}
nsresult nsFrame::GetContentForEvent(WidgetEvent* aEvent,
nsIContent** aContent) {
nsIFrame* f = nsLayoutUtils::GetNonGeneratedAncestor(this);
*aContent = f->GetContent();
NS_IF_ADDREF(*aContent);
return NS_OK;
}
void nsFrame::FireDOMEvent(const nsAString& aDOMEventName,
nsIContent* aContent) {
nsIContent* target = aContent ? aContent : GetContent();
if (target) {
RefPtr<AsyncEventDispatcher> asyncDispatcher = new AsyncEventDispatcher(
target, aDOMEventName, CanBubble::eYes, ChromeOnlyDispatch::eNo);
DebugOnly<nsresult> rv = asyncDispatcher->PostDOMEvent();
NS_ASSERTION(NS_SUCCEEDED(rv), "AsyncEventDispatcher failed to dispatch");
}
}
nsresult nsFrame::HandleEvent(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
if (aEvent->mMessage == eMouseMove) {
// XXX If the second argument of HandleDrag() is WidgetMouseEvent,
// the implementation becomes simpler.
return HandleDrag(aPresContext, aEvent, aEventStatus);
}
if ((aEvent->mClass == eMouseEventClass &&
aEvent->AsMouseEvent()->button == WidgetMouseEvent::eLeftButton) ||
aEvent->mClass == eTouchEventClass) {
if (aEvent->mMessage == eMouseDown || aEvent->mMessage == eTouchStart) {
HandlePress(aPresContext, aEvent, aEventStatus);
} else if (aEvent->mMessage == eMouseUp || aEvent->mMessage == eTouchEnd) {
HandleRelease(aPresContext, aEvent, aEventStatus);
}
}
return NS_OK;
}
nsresult nsFrame::GetDataForTableSelection(
const nsFrameSelection* aFrameSelection, nsIPresShell* aPresShell,
WidgetMouseEvent* aMouseEvent, nsIContent** aParentContent,
int32_t* aContentOffset, TableSelection* aTarget) {
if (!aFrameSelection || !aPresShell || !aMouseEvent || !aParentContent ||
!aContentOffset || !aTarget)
return NS_ERROR_NULL_POINTER;
*aParentContent = nullptr;
*aContentOffset = 0;
*aTarget = TableSelection::None;
int16_t displaySelection = aPresShell->GetSelectionFlags();
bool selectingTableCells = aFrameSelection->GetTableCellSelection();
// DISPLAY_ALL means we're in an editor.
// If already in cell selection mode,
// continue selecting with mouse drag or end on mouse up,
// or when using shift key to extend block of cells
// (Mouse down does normal selection unless Ctrl/Cmd is pressed)
bool doTableSelection =
displaySelection == nsISelectionDisplay::DISPLAY_ALL &&
selectingTableCells &&
(aMouseEvent->mMessage == eMouseMove ||
(aMouseEvent->mMessage == eMouseUp &&
aMouseEvent->button == WidgetMouseEvent::eLeftButton) ||
aMouseEvent->IsShift());
if (!doTableSelection) {
// In Browser, special 'table selection' key must be pressed for table
// selection or when just Shift is pressed and we're already in table/cell
// selection mode
#ifdef XP_MACOSX
doTableSelection = aMouseEvent->IsMeta() ||
(aMouseEvent->IsShift() && selectingTableCells);
#else
doTableSelection = aMouseEvent->IsControl() ||
(aMouseEvent->IsShift() && selectingTableCells);
#endif
}
if (!doTableSelection) return NS_OK;
// Get the cell frame or table frame (or parent) of the current content node
nsIFrame* frame = this;
bool foundCell = false;
bool foundTable = false;
// Get the limiting node to stop parent frame search
nsIContent* limiter = aFrameSelection->GetLimiter();
// If our content node is an ancestor of the limiting node,
// we should stop the search right now.
if (limiter && nsContentUtils::ContentIsDescendantOf(limiter, GetContent()))
return NS_OK;
// We don't initiate row/col selection from here now,
// but we may in future
// bool selectColumn = false;
// bool selectRow = false;
while (frame) {
// Check for a table cell by querying to a known CellFrame interface
nsITableCellLayout* cellElement = do_QueryFrame(frame);
if (cellElement) {
foundCell = true;
// TODO: If we want to use proximity to top or left border
// for row and column selection, this is the place to do it
break;
} else {
// If not a cell, check for table
// This will happen when starting frame is the table or child of a table,
// such as a row (we were inbetween cells or in table border)
nsTableWrapperFrame* tableFrame = do_QueryFrame(frame);
if (tableFrame) {
foundTable = true;
// TODO: How can we select row when along left table edge
// or select column when along top edge?
break;
} else {
frame = frame->GetParent();
// Stop if we have hit the selection's limiting content node
if (frame && frame->GetContent() == limiter) break;
}
}
}
// We aren't in a cell or table
if (!foundCell && !foundTable) return NS_OK;
nsIContent* tableOrCellContent = frame->GetContent();
if (!tableOrCellContent) return NS_ERROR_FAILURE;
nsCOMPtr<nsIContent> parentContent = tableOrCellContent->GetParent();
if (!parentContent) return NS_ERROR_FAILURE;
int32_t offset = parentContent->ComputeIndexOf(tableOrCellContent);
// Not likely?
if (offset < 0) return NS_ERROR_FAILURE;
// Everything is OK -- set the return values
parentContent.forget(aParentContent);
*aContentOffset = offset;
#if 0
if (selectRow)
*aTarget = TableSelection::Row;
else if (selectColumn)
*aTarget = TableSelection::Column;
else
#endif
if (foundCell)
*aTarget = TableSelection::Cell;
else if (foundTable)
*aTarget = TableSelection::Table;
return NS_OK;
}
static StyleUserSelect UsedUserSelect(const nsIFrame* aFrame) {
if (aFrame->HasAnyStateBits(NS_FRAME_GENERATED_CONTENT)) {
return StyleUserSelect::None;
}
auto style = aFrame->StyleUIReset()->mUserSelect;
if (style != StyleUserSelect::Auto) {
return style;
}
auto* parent = nsLayoutUtils::GetParentOrPlaceholderFor(aFrame);
return parent ? UsedUserSelect(parent) : StyleUserSelect::Text;
}
bool nsIFrame::IsSelectable(StyleUserSelect* aSelectStyle) const {
auto style = UsedUserSelect(this);
if (aSelectStyle) {
*aSelectStyle = style;
}
return style != StyleUserSelect::None;
}
/**
* Handles the Mouse Press Event for the frame
*/
NS_IMETHODIMP
nsFrame::HandlePress(nsPresContext* aPresContext, WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
NS_ENSURE_ARG_POINTER(aEventStatus);
if (nsEventStatus_eConsumeNoDefault == *aEventStatus) {
return NS_OK;
}
NS_ENSURE_ARG_POINTER(aEvent);
if (aEvent->mClass == eTouchEventClass) {
return NS_OK;
}
// We often get out of sync state issues with mousedown events that
// get interrupted by alerts/dialogs.
// Check with the ESM to see if we should process this one
if (!aPresContext->EventStateManager()->EventStatusOK(aEvent)) return NS_OK;
nsIPresShell* shell = aPresContext->GetPresShell();
if (!shell) return NS_ERROR_FAILURE;
// if we are in Navigator and the click is in a draggable node, we don't want
// to start selection because we don't want to interfere with a potential
// drag of said node and steal all its glory.
int16_t isEditor = shell->GetSelectionFlags();
// weaaak. only the editor can display frame selection not just text and
// images
isEditor = isEditor == nsISelectionDisplay::DISPLAY_ALL;
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (!mouseEvent->IsAlt()) {
for (nsIContent* content = mContent; content;
content = content->GetParent()) {
if (nsContentUtils::ContentIsDraggable(content) &&
!content->IsEditable()) {
// coordinate stuff is the fix for bug #55921
if ((mRect - GetPosition())
.Contains(nsLayoutUtils::GetEventCoordinatesRelativeTo(
mouseEvent, this))) {
return NS_OK;
}
}
}
}
// check whether style allows selection
// if not, don't tell selection the mouse event even occurred.
StyleUserSelect selectStyle;
// check for select: none
if (!IsSelectable(&selectStyle)) {
return NS_OK;
}
bool useFrameSelection = (selectStyle == StyleUserSelect::Text);
// If the mouse is dragged outside the nearest enclosing scrollable area
// while making a selection, the area will be scrolled. To do this, capture
// the mouse on the nearest scrollable frame. If there isn't a scrollable
// frame, or something else is already capturing the mouse, there's no
// reason to capture.
if (!nsIPresShell::GetCapturingContent()) {
nsIScrollableFrame* scrollFrame = nsLayoutUtils::GetNearestScrollableFrame(
this, nsLayoutUtils::SCROLLABLE_SAME_DOC |
nsLayoutUtils::SCROLLABLE_INCLUDE_HIDDEN);
if (scrollFrame) {
nsIFrame* capturingFrame = do_QueryFrame(scrollFrame);
nsIPresShell::SetCapturingContent(capturingFrame->GetContent(),
CAPTURE_IGNOREALLOWED);
}
}
// XXX This is screwy; it really should use the selection frame, not the
// event frame
const nsFrameSelection* frameselection = nullptr;
if (useFrameSelection)
frameselection = GetConstFrameSelection();
else
frameselection = shell->ConstFrameSelection();
if (!frameselection || frameselection->GetDisplaySelection() ==
nsISelectionController::SELECTION_OFF)
return NS_OK; // nothing to do we cannot affect selection from here
#ifdef XP_MACOSX
if (mouseEvent->IsControl())
return NS_OK; // short circuit. hard coded for mac due to time restraints.
bool control = mouseEvent->IsMeta();
#else
bool control = mouseEvent->IsControl();
#endif
RefPtr<nsFrameSelection> fc = const_cast<nsFrameSelection*>(frameselection);
if (mouseEvent->mClickCount > 1) {
// These methods aren't const but can't actually delete anything,
// so no need for AutoWeakFrame.
fc->SetDragState(true);
fc->SetMouseDoubleDown(true);
return HandleMultiplePress(aPresContext, mouseEvent, aEventStatus, control);
}
nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(mouseEvent, this);
ContentOffsets offsets = GetContentOffsetsFromPoint(pt, SKIP_HIDDEN);
if (!offsets.content) return NS_ERROR_FAILURE;
// Let Ctrl/Cmd+mouse down do table selection instead of drag initiation
nsCOMPtr<nsIContent> parentContent;
int32_t contentOffset;
TableSelection target;
nsresult rv;
rv = GetDataForTableSelection(frameselection, shell, mouseEvent,
getter_AddRefs(parentContent), &contentOffset,
&target);
if (NS_SUCCEEDED(rv) && parentContent) {
fc->SetDragState(true);
return fc->HandleTableSelection(parentContent, contentOffset, target,
mouseEvent);
}
fc->SetDelayedCaretData(0);
// Check if any part of this frame is selected, and if the
// user clicked inside the selected region. If so, we delay
// starting a new selection since the user may be trying to
// drag the selected region to some other app.
if (GetContent() && GetContent()->IsSelectionDescendant()) {
bool inSelection = false;
UniquePtr<SelectionDetails> details = frameselection->LookUpSelection(
offsets.content, 0, offsets.EndOffset(), false);
//
// If there are any details, check to see if the user clicked
// within any selected region of the frame.
//
for (SelectionDetails* curDetail = details.get(); curDetail;
curDetail = curDetail->mNext.get()) {
//
// If the user clicked inside a selection, then just
// return without doing anything. We will handle placing
// the caret later on when the mouse is released. We ignore
// the spellcheck, find and url formatting selections.
//
if (curDetail->mSelectionType != SelectionType::eSpellCheck &&
curDetail->mSelectionType != SelectionType::eFind &&
curDetail->mSelectionType != SelectionType::eURLSecondary &&
curDetail->mSelectionType != SelectionType::eURLStrikeout &&
curDetail->mStart <= offsets.StartOffset() &&
offsets.EndOffset() <= curDetail->mEnd) {
inSelection = true;
}
}
if (inSelection) {
fc->SetDragState(false);
fc->SetDelayedCaretData(mouseEvent);
return NS_OK;
}
}
fc->SetDragState(true);
// Do not touch any nsFrame members after this point without adding
// weakFrame checks.
rv = fc->HandleClick(offsets.content, offsets.StartOffset(),
offsets.EndOffset(), mouseEvent->IsShift(), control,
offsets.associate);
if (NS_FAILED(rv)) return rv;
if (offsets.offset != offsets.secondaryOffset) fc->MaintainSelection();
if (isEditor && !mouseEvent->IsShift() &&
(offsets.EndOffset() - offsets.StartOffset()) == 1) {
// A single node is selected and we aren't extending an existing
// selection, which means the user clicked directly on an object (either
// -moz-user-select: all or a non-text node without children).
// Therefore, disable selection extension during mouse moves.
// XXX This is a bit hacky; shouldn't editor be able to deal with this?
fc->SetDragState(false);
}
return rv;
}
/*
* SelectByTypeAtPoint
*
* Search for selectable content at point and attempt to select
* based on the start and end selection behaviours.
*
* @param aPresContext Presentation context
* @param aPoint Point at which selection will occur. Coordinates
* should be relaitve to this frame.
* @param aBeginAmountType, aEndAmountType Selection behavior, see
* nsIFrame for definitions.
* @param aSelectFlags Selection flags defined in nsFame.h.
* @return success or failure at finding suitable content to select.
*/
nsresult nsFrame::SelectByTypeAtPoint(nsPresContext* aPresContext,
const nsPoint& aPoint,
nsSelectionAmount aBeginAmountType,
nsSelectionAmount aEndAmountType,
uint32_t aSelectFlags) {
NS_ENSURE_ARG_POINTER(aPresContext);
// No point in selecting if selection is turned off
if (DisplaySelection(aPresContext) == nsISelectionController::SELECTION_OFF)
return NS_OK;
ContentOffsets offsets = GetContentOffsetsFromPoint(aPoint, SKIP_HIDDEN);
if (!offsets.content) return NS_ERROR_FAILURE;
int32_t offset;
const nsFrameSelection* frameSelection =
PresContext()->GetPresShell()->ConstFrameSelection();
nsIFrame* theFrame = frameSelection->GetFrameForNodeOffset(
offsets.content, offsets.offset, offsets.associate, &offset);
if (!theFrame) return NS_ERROR_FAILURE;
nsFrame* frame = static_cast<nsFrame*>(theFrame);
return frame->PeekBackwardAndForward(aBeginAmountType, aEndAmountType, offset,
aBeginAmountType != eSelectWord,
aSelectFlags);
}
/**
* Multiple Mouse Press -- line or paragraph selection -- for the frame.
* Wouldn't it be nice if this didn't have to be hardwired into Frame code?
*/
NS_IMETHODIMP
nsFrame::HandleMultiplePress(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus, bool aControlHeld) {
NS_ENSURE_ARG_POINTER(aEvent);
NS_ENSURE_ARG_POINTER(aEventStatus);
if (nsEventStatus_eConsumeNoDefault == *aEventStatus ||
DisplaySelection(aPresContext) == nsISelectionController::SELECTION_OFF) {
return NS_OK;
}
// Find out whether we're doing line or paragraph selection.
// If browser.triple_click_selects_paragraph is true, triple-click selects
// paragraph. Otherwise, triple-click selects line, and quadruple-click
// selects paragraph (on platforms that support quadruple-click).
nsSelectionAmount beginAmount, endAmount;
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (!mouseEvent) {
return NS_OK;
}
if (mouseEvent->mClickCount == 4) {
beginAmount = endAmount = eSelectParagraph;
} else if (mouseEvent->mClickCount == 3) {
if (Preferences::GetBool("browser.triple_click_selects_paragraph")) {
beginAmount = endAmount = eSelectParagraph;
} else {
beginAmount = eSelectBeginLine;
endAmount = eSelectEndLine;
}
} else if (mouseEvent->mClickCount == 2) {
// We only want inline frames; PeekBackwardAndForward dislikes blocks
beginAmount = endAmount = eSelectWord;
} else {
return NS_OK;
}
nsPoint relPoint =
nsLayoutUtils::GetEventCoordinatesRelativeTo(mouseEvent, this);
return SelectByTypeAtPoint(aPresContext, relPoint, beginAmount, endAmount,
(aControlHeld ? SELECT_ACCUMULATE : 0));
}
nsresult nsFrame::PeekBackwardAndForward(nsSelectionAmount aAmountBack,
nsSelectionAmount aAmountForward,
int32_t aStartPos, bool aJumpLines,
uint32_t aSelectFlags) {
nsIFrame* baseFrame = this;
int32_t baseOffset = aStartPos;
nsresult rv;
if (aAmountBack == eSelectWord) {
// To avoid selecting the previous word when at start of word,
// first move one character forward.
nsPeekOffsetStruct pos(eSelectCharacter, eDirNext, aStartPos, nsPoint(0, 0),
aJumpLines,
true, // limit on scrolled views
false, false, false);
rv = PeekOffset(&pos);
if (NS_SUCCEEDED(rv)) {
baseFrame = pos.mResultFrame;
baseOffset = pos.mContentOffset;
}
}
// Use peek offset one way then the other:
nsPeekOffsetStruct startpos(aAmountBack, eDirPrevious, baseOffset,
nsPoint(0, 0), aJumpLines,
true, // limit on scrolled views
false, false, false);
rv = baseFrame->PeekOffset(&startpos);
if (NS_FAILED(rv)) return rv;
nsPeekOffsetStruct endpos(aAmountForward, eDirNext, aStartPos, nsPoint(0, 0),
aJumpLines,
true, // limit on scrolled views
false, false, false);
rv = PeekOffset(&endpos);
if (NS_FAILED(rv)) return rv;
// Keep frameSelection alive.
RefPtr<nsFrameSelection> frameSelection = GetFrameSelection();
rv = frameSelection->HandleClick(
startpos.mResultContent, startpos.mContentOffset, startpos.mContentOffset,
false, (aSelectFlags & SELECT_ACCUMULATE), CARET_ASSOCIATE_AFTER);
if (NS_FAILED(rv)) return rv;
rv = frameSelection->HandleClick(endpos.mResultContent, endpos.mContentOffset,
endpos.mContentOffset, true, false,
CARET_ASSOCIATE_BEFORE);
if (NS_FAILED(rv)) return rv;
// maintain selection
return frameSelection->MaintainSelection(aAmountBack);
}
NS_IMETHODIMP nsFrame::HandleDrag(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
MOZ_ASSERT(aEvent->mClass == eMouseEventClass,
"HandleDrag can only handle mouse event");
RefPtr<nsFrameSelection> frameselection = GetFrameSelection();
bool mouseDown = frameselection->GetDragState();
if (!mouseDown) {
return NS_OK;
}
nsIFrame* scrollbar =
nsLayoutUtils::GetClosestFrameOfType(this, LayoutFrameType::Scrollbar);
if (!scrollbar) {
// XXX Do we really need to exclude non-selectable content here?
// GetContentOffsetsFromPoint can handle it just fine, although some
// other stuff might not like it.
// NOTE: DisplaySelection() returns SELECTION_OFF for non-selectable frames.
if (DisplaySelection(aPresContext) ==
nsISelectionController::SELECTION_OFF) {
return NS_OK;
}
}
frameselection->StopAutoScrollTimer();
// Check if we are dragging in a table cell
nsCOMPtr<nsIContent> parentContent;
int32_t contentOffset;
TableSelection target;
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
nsCOMPtr<nsIPresShell> presShell = aPresContext->PresShell();
nsresult result;
result = GetDataForTableSelection(frameselection, presShell, mouseEvent,
getter_AddRefs(parentContent),
&contentOffset, &target);
AutoWeakFrame weakThis = this;
if (NS_SUCCEEDED(result) && parentContent) {
frameselection->HandleTableSelection(parentContent, contentOffset, target,
mouseEvent);
} else {
nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(mouseEvent, this);
frameselection->HandleDrag(this, pt);
}
// The frameselection object notifies selection listeners synchronously above
// which might have killed us.
if (!weakThis.IsAlive()) {
return NS_OK;
}
// get the nearest scrollframe
nsIScrollableFrame* scrollFrame = nsLayoutUtils::GetNearestScrollableFrame(
this, nsLayoutUtils::SCROLLABLE_SAME_DOC |
nsLayoutUtils::SCROLLABLE_INCLUDE_HIDDEN);
if (scrollFrame) {
nsIFrame* capturingFrame = scrollFrame->GetScrolledFrame();
if (capturingFrame) {
nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(mouseEvent,
capturingFrame);
frameselection->StartAutoScrollTimer(capturingFrame, pt, 30);
}
}
return NS_OK;
}
/**
* This static method handles part of the nsFrame::HandleRelease in a way
* which doesn't rely on the nsFrame object to stay alive.
*/
static nsresult HandleFrameSelection(
nsFrameSelection* aFrameSelection, nsIFrame::ContentOffsets& aOffsets,
bool aHandleTableSel, int32_t aContentOffsetForTableSel,
TableSelection aTargetForTableSel, nsIContent* aParentContentForTableSel,
WidgetGUIEvent* aEvent, nsEventStatus* aEventStatus) {
if (!aFrameSelection) {
return NS_OK;
}
nsresult rv = NS_OK;
if (nsEventStatus_eConsumeNoDefault != *aEventStatus) {
if (!aHandleTableSel) {
if (!aOffsets.content || !aFrameSelection->HasDelayedCaretData()) {
return NS_ERROR_FAILURE;
}
// We are doing this to simulate what we would have done on HandlePress.
// We didn't do it there to give the user an opportunity to drag
// the text, but since they didn't drag, we want to place the
// caret.
// However, we'll use the mouse position from the release, since:
// * it's easier
// * that's the normal click position to use (although really, in
// the normal case, small movements that don't count as a drag
// can do selection)
aFrameSelection->SetDragState(true);
rv = aFrameSelection->HandleClick(
aOffsets.content, aOffsets.StartOffset(), aOffsets.EndOffset(),
aFrameSelection->IsShiftDownInDelayedCaretData(), false,
aOffsets.associate);
if (NS_FAILED(rv)) {
return rv;
}
} else if (aParentContentForTableSel) {
aFrameSelection->SetDragState(false);
rv = aFrameSelection->HandleTableSelection(
aParentContentForTableSel, aContentOffsetForTableSel,
aTargetForTableSel, aEvent->AsMouseEvent());
if (NS_FAILED(rv)) {
return rv;
}
}
aFrameSelection->SetDelayedCaretData(0);
}
aFrameSelection->SetDragState(false);
aFrameSelection->StopAutoScrollTimer();
return NS_OK;
}
NS_IMETHODIMP nsFrame::HandleRelease(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
if (aEvent->mClass != eMouseEventClass) {
return NS_OK;
}
nsIFrame* activeFrame = GetActiveSelectionFrame(aPresContext, this);
nsCOMPtr<nsIContent> captureContent = nsIPresShell::GetCapturingContent();
// We can unconditionally stop capturing because
// we should never be capturing when the mouse button is up
nsIPresShell::SetCapturingContent(nullptr, 0);
bool selectionOff =
(DisplaySelection(aPresContext) == nsISelectionController::SELECTION_OFF);
RefPtr<nsFrameSelection> frameselection;
ContentOffsets offsets;
nsCOMPtr<nsIContent> parentContent;
int32_t contentOffsetForTableSel = 0;
TableSelection targetForTableSel = TableSelection::None;
bool handleTableSelection = true;
if (!selectionOff) {
frameselection = GetFrameSelection();
if (nsEventStatus_eConsumeNoDefault != *aEventStatus && frameselection) {
// Check if the frameselection recorded the mouse going down.
// If not, the user must have clicked in a part of the selection.
// Place the caret before continuing!
if (frameselection->MouseDownRecorded()) {
nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, this);
offsets = GetContentOffsetsFromPoint(pt, SKIP_HIDDEN);
handleTableSelection = false;
} else {
GetDataForTableSelection(frameselection, PresShell(),
aEvent->AsMouseEvent(),
getter_AddRefs(parentContent),
&contentOffsetForTableSel, &targetForTableSel);
}
}
}
// We might be capturing in some other document and the event just happened to
// trickle down here. Make sure that document's frame selection is notified.
// Note, this may cause the current nsFrame object to be deleted, bug 336592.
RefPtr<nsFrameSelection> frameSelection;
if (activeFrame != this &&
static_cast<nsFrame*>(activeFrame)
->DisplaySelection(activeFrame->PresContext()) !=
nsISelectionController::SELECTION_OFF) {
frameSelection = activeFrame->GetFrameSelection();
}
// Also check the selection of the capturing content which might be in a
// different document.
if (!frameSelection && captureContent) {
Document* doc = captureContent->GetUncomposedDoc();
if (doc) {
nsIPresShell* capturingShell = doc->GetShell();
if (capturingShell && capturingShell != PresContext()->GetPresShell()) {
frameSelection = capturingShell->FrameSelection();
}
}
}
if (frameSelection) {
frameSelection->SetDragState(false);
frameSelection->StopAutoScrollTimer();
nsIScrollableFrame* scrollFrame = nsLayoutUtils::GetNearestScrollableFrame(
this, nsLayoutUtils::SCROLLABLE_SAME_DOC |
nsLayoutUtils::SCROLLABLE_INCLUDE_HIDDEN);
if (scrollFrame) {
// Perform any additional scrolling needed to maintain CSS snap point
// requirements when autoscrolling is over.
scrollFrame->ScrollSnap();
}
}
// Do not call any methods of the current object after this point!!!
// The object is perhaps dead!
return selectionOff ? NS_OK
: HandleFrameSelection(
frameselection, offsets, handleTableSelection,
contentOffsetForTableSel, targetForTableSel,
parentContent, aEvent, aEventStatus);
}
struct MOZ_STACK_CLASS FrameContentRange {
FrameContentRange(nsIContent* aContent, int32_t aStart, int32_t aEnd)
: content(aContent), start(aStart), end(aEnd) {}
nsCOMPtr<nsIContent> content;
int32_t start;
int32_t end;
};
// Retrieve the content offsets of a frame
static FrameContentRange GetRangeForFrame(nsIFrame* aFrame) {
nsIContent* content = aFrame->GetContent();
if (!content) {
NS_WARNING("Frame has no content");
return FrameContentRange(nullptr, -1, -1);
}
LayoutFrameType type = aFrame->Type();
if (type == LayoutFrameType::Text) {
int32_t offset, offsetEnd;
aFrame->GetOffsets(offset, offsetEnd);
return FrameContentRange(content, offset, offsetEnd);
}
if (type == LayoutFrameType::Br) {
nsIContent* parent = content->GetParent();
int32_t beginOffset = parent->ComputeIndexOf(content);
return FrameContentRange(parent, beginOffset, beginOffset);
}
while (content->IsRootOfAnonymousSubtree()) {
content = content->GetParent();
}
nsIContent* parent = content->GetParent();
if (nsLayoutUtils::GetAsBlock(aFrame) || !parent) {
return FrameContentRange(content, 0, content->GetChildCount());
}
// TODO(emilio): Revise this in presence of Shadow DOM / display: contents,
// it's likely that we don't want to just walk the light tree, and we need to
// change the representation of FrameContentRange.
int32_t index = parent->ComputeIndexOf(content);
MOZ_ASSERT(index >= 0);
return FrameContentRange(parent, index, index + 1);
}
// The FrameTarget represents the closest frame to a point that can be selected
// The frame is the frame represented, frameEdge says whether one end of the
// frame is the result (in which case different handling is needed), and
// afterFrame says which end is repersented if frameEdge is true
struct FrameTarget {
FrameTarget(nsIFrame* aFrame, bool aFrameEdge, bool aAfterFrame)
: frame(aFrame), frameEdge(aFrameEdge), afterFrame(aAfterFrame) {}
static FrameTarget Null() { return FrameTarget(nullptr, false, false); }
bool IsNull() { return !frame; }
nsIFrame* frame;
bool frameEdge;
bool afterFrame;
};
// See function implementation for information
static FrameTarget GetSelectionClosestFrame(nsIFrame* aFrame,
const nsPoint& aPoint,
uint32_t aFlags);
static bool SelfIsSelectable(nsIFrame* aFrame, uint32_t aFlags) {
if ((aFlags & nsIFrame::SKIP_HIDDEN) &&
!aFrame->StyleVisibility()->IsVisible()) {
return false;
}
return !aFrame->IsGeneratedContentFrame() &&
aFrame->StyleUIReset()->mUserSelect != StyleUserSelect::None;
}
static bool SelectionDescendToKids(nsIFrame* aFrame) {
StyleUserSelect style = aFrame->StyleUIReset()->mUserSelect;
nsIFrame* parent = aFrame->GetParent();
// If we are only near (not directly over) then don't traverse
// frames with independent selection (e.g. text and list controls)
// unless we're already inside such a frame (see bug 268497). Note that this
// prevents any of the users of this method from entering form controls.
// XXX We might want some way to allow using the up-arrow to go into a form
// control, but the focus didn't work right anyway; it'd probably be enough
// if the left and right arrows could enter textboxes (which I don't believe
// they can at the moment)
return !aFrame->IsGeneratedContentFrame() && style != StyleUserSelect::All &&
style != StyleUserSelect::None &&
((parent->GetStateBits() & NS_FRAME_INDEPENDENT_SELECTION) ||
!(aFrame->GetStateBits() & NS_FRAME_INDEPENDENT_SELECTION));
}
static FrameTarget GetSelectionClosestFrameForChild(nsIFrame* aChild,
const nsPoint& aPoint,
uint32_t aFlags) {
nsIFrame* parent = aChild->GetParent();
if (SelectionDescendToKids(aChild)) {
nsPoint pt = aPoint - aChild->GetOffsetTo(parent);
return GetSelectionClosestFrame(aChild, pt, aFlags);
}
return FrameTarget(aChild, false, false);
}
// When the cursor needs to be at the beginning of a block, it shouldn't be
// before the first child. A click on a block whose first child is a block
// should put the cursor in the child. The cursor shouldn't be between the
// blocks, because that's not where it's expected.
// Note that this method is guaranteed to succeed.
static FrameTarget DrillDownToSelectionFrame(nsIFrame* aFrame, bool aEndFrame,
uint32_t aFlags) {
if (SelectionDescendToKids(aFrame)) {
nsIFrame* result = nullptr;
nsIFrame* frame = aFrame->PrincipalChildList().FirstChild();
if (!aEndFrame) {
while (frame && (!SelfIsSelectable(frame, aFlags) || frame->IsEmpty()))
frame = frame->GetNextSibling();
if (frame) result = frame;
} else {
// Because the frame tree is singly linked, to find the last frame,
// we have to iterate through all the frames
// XXX I have a feeling this could be slow for long blocks, although
// I can't find any slowdowns
while (frame) {
if (!frame->IsEmpty() && SelfIsSelectable(frame, aFlags))
result = frame;
frame = frame->GetNextSibling();
}
}
if (result) return DrillDownToSelectionFrame(result, aEndFrame, aFlags);
}
// If the current frame has no targetable children, target the current frame
return FrameTarget(aFrame, true, aEndFrame);
}
// This method finds the closest valid FrameTarget on a given line; if there is
// no valid FrameTarget on the line, it returns a null FrameTarget
static FrameTarget GetSelectionClosestFrameForLine(
nsBlockFrame* aParent, nsBlockFrame::LineIterator aLine,
const nsPoint& aPoint, uint32_t aFlags) {
// Account for end of lines (any iterator from the block is valid)
if (aLine == aParent->LinesEnd())
return DrillDownToSelectionFrame(aParent, true, aFlags);
nsIFrame* frame = aLine->mFirstChild;
nsIFrame* closestFromIStart = nullptr;
nsIFrame* closestFromIEnd = nullptr;
nscoord closestIStart = aLine->IStart(), closestIEnd = aLine->IEnd();
WritingMode wm = aLine->mWritingMode;
LogicalPoint pt(wm, aPoint, aLine->mContainerSize);
bool canSkipBr = false;
bool lastFrameWasEditable = false;
for (int32_t n = aLine->GetChildCount(); n;
--n, frame = frame->GetNextSibling()) {
// Skip brFrames. Can only skip if the line contains at least
// one selectable and non-empty frame before. Also, avoid skipping brs if
// the previous thing had a different editableness than us, since then we
// may end up not being able to select after it if the br is the last thing
// on the line.
if (!SelfIsSelectable(frame, aFlags) || frame->IsEmpty() ||
(canSkipBr && frame->IsBrFrame() &&
lastFrameWasEditable == frame->GetContent()->IsEditable())) {
continue;
}
canSkipBr = true;
lastFrameWasEditable =
frame->GetContent() && frame->GetContent()->IsEditable();
LogicalRect frameRect =
LogicalRect(wm, frame->GetRect(), aLine->mContainerSize);
if (pt.I(wm) >= frameRect.IStart(wm)) {
if (pt.I(wm) < frameRect.IEnd(wm)) {
return GetSelectionClosestFrameForChild(frame, aPoint, aFlags);
}
if (frameRect.IEnd(wm) >= closestIStart) {
closestFromIStart = frame;
closestIStart = frameRect.IEnd(wm);
}
} else {
if (frameRect.IStart(wm) <= closestIEnd) {
closestFromIEnd = frame;
closestIEnd = frameRect.IStart(wm);
}
}
}
if (!closestFromIStart && !closestFromIEnd) {
// We should only get here if there are no selectable frames on a line
// XXX Do we need more elaborate handling here?
return FrameTarget::Null();
}
if (closestFromIStart &&
(!closestFromIEnd ||
(abs(pt.I(wm) - closestIStart) <= abs(pt.I(wm) - closestIEnd)))) {
return GetSelectionClosestFrameForChild(closestFromIStart, aPoint, aFlags);
}
return GetSelectionClosestFrameForChild(closestFromIEnd, aPoint, aFlags);
}
// This method is for the special handling we do for block frames; they're
// special because they represent paragraphs and because they are organized
// into lines, which have bounds that are not stored elsewhere in the
// frame tree. Returns a null FrameTarget for frames which are not
// blocks or blocks with no lines except editable one.
static FrameTarget GetSelectionClosestFrameForBlock(nsIFrame* aFrame,
const nsPoint& aPoint,
uint32_t aFlags) {
nsBlockFrame* bf = nsLayoutUtils::GetAsBlock(aFrame); // used only for QI
if (!bf) return FrameTarget::Null();
// This code searches for the correct line
nsBlockFrame::LineIterator end = bf->LinesEnd();
nsBlockFrame::LineIterator curLine = bf->LinesBegin();
nsBlockFrame::LineIterator closestLine = end;
if (curLine != end) {
// Convert aPoint into a LogicalPoint in the writing-mode of this block
WritingMode wm = curLine->mWritingMode;
LogicalPoint pt(wm, aPoint, curLine->mContainerSize);
do {
// Check to see if our point lies within the line's block-direction bounds
nscoord BCoord = pt.B(wm) - curLine->BStart();
nscoord BSize = curLine->BSize();
if (BCoord >= 0 && BCoord < BSize) {
closestLine = curLine;
break; // We found the line; stop looking
}
if (BCoord < 0) break;
++curLine;
} while (curLine != end);
if (closestLine == end) {
nsBlockFrame::LineIterator prevLine = curLine.prev();
nsBlockFrame::LineIterator nextLine = curLine;
// Avoid empty lines
while (nextLine != end && nextLine->IsEmpty()) ++nextLine;
while (prevLine != end && prevLine->IsEmpty()) --prevLine;
// This hidden pref dictates whether a point above or below all lines
// comes up with a line or the beginning or end of the frame; 0 on
// Windows, 1 on other platforms by default at the writing of this code
int32_t dragOutOfFrame =
Preferences::GetInt("browser.drag_out_of_frame_style");
if (prevLine == end) {
if (dragOutOfFrame == 1 || nextLine == end)
return DrillDownToSelectionFrame(aFrame, false, aFlags);
closestLine = nextLine;
} else if (nextLine == end) {
if (dragOutOfFrame == 1)
return DrillDownToSelectionFrame(aFrame, true, aFlags);
closestLine = prevLine;
} else { // Figure out which line is closer
if (pt.B(wm) - prevLine->BEnd() < nextLine->BStart() - pt.B(wm))
closestLine = prevLine;
else
closestLine = nextLine;
}
}
}
do {
FrameTarget target =
GetSelectionClosestFrameForLine(bf, closestLine, aPoint, aFlags);
if (!target.IsNull()) return target;
++closestLine;
} while (closestLine != end);
// Fall back to just targeting the last targetable place
return DrillDownToSelectionFrame(aFrame, true, aFlags);
}
// GetSelectionClosestFrame is the helper function that calculates the closest
// frame to the given point.
// It doesn't completely account for offset styles, so needs to be used in
// restricted environments.
// Cannot handle overlapping frames correctly, so it should receive the output
// of GetFrameForPoint
// Guaranteed to return a valid FrameTarget
static FrameTarget GetSelectionClosestFrame(nsIFrame* aFrame,
const nsPoint& aPoint,
uint32_t aFlags) {
{
// Handle blocks; if the frame isn't a block, the method fails
FrameTarget target =
GetSelectionClosestFrameForBlock(aFrame, aPoint, aFlags);
if (!target.IsNull()) return target;
}
nsIFrame* kid = aFrame->PrincipalChildList().FirstChild();
if (kid) {
// Go through all the child frames to find the closest one
nsIFrame::FrameWithDistance closest = {nullptr, nscoord_MAX, nscoord_MAX};
for (; kid; kid = kid->GetNextSibling()) {
if (!SelfIsSelectable(kid, aFlags) || kid->IsEmpty()) continue;
kid->FindCloserFrameForSelection(aPoint, &closest);
}
if (closest.mFrame) {
if (nsSVGUtils::IsInSVGTextSubtree(closest.mFrame))
return FrameTarget(closest.mFrame, false, false);
return GetSelectionClosestFrameForChild(closest.mFrame, aPoint, aFlags);
}
}
return FrameTarget(aFrame, false, false);
}
static nsIFrame::ContentOffsets OffsetsForSingleFrame(nsIFrame* aFrame,
const nsPoint& aPoint) {
nsIFrame::ContentOffsets offsets;
FrameContentRange range = GetRangeForFrame(aFrame);
offsets.content = range.content;
// If there are continuations (meaning it's not one rectangle), this is the
// best this function can do
if (aFrame->GetNextContinuation() || aFrame->GetPrevContinuation()) {
offsets.offset = range.start;
offsets.secondaryOffset = range.end;
offsets.associate = CARET_ASSOCIATE_AFTER;
return offsets;
}
// Figure out whether the offsets should be over, after, or before the frame
nsRect rect(nsPoint(0, 0), aFrame->GetSize());
bool isBlock = aFrame->GetDisplay() != StyleDisplay::Inline;
bool isRtl =
(aFrame->StyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL);
if ((isBlock && rect.y < aPoint.y) ||
(!isBlock && ((isRtl && rect.x + rect.width / 2 > aPoint.x) ||
(!isRtl && rect.x + rect.width / 2 < aPoint.x)))) {
offsets.offset = range.end;
if (rect.Contains(aPoint))
offsets.secondaryOffset = range.start;
else
offsets.secondaryOffset = range.end;
} else {
offsets.offset = range.start;
if (rect.Contains(aPoint))
offsets.secondaryOffset = range.end;
else
offsets.secondaryOffset = range.start;
}
offsets.associate = offsets.offset == range.start ? CARET_ASSOCIATE_AFTER
: CARET_ASSOCIATE_BEFORE;
return offsets;
}
static nsIFrame* AdjustFrameForSelectionStyles(nsIFrame* aFrame) {
nsIFrame* adjustedFrame = aFrame;
for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) {
// These are the conditions that make all children not able to handle
// a cursor.
StyleUserSelect userSelect = frame->StyleUIReset()->mUserSelect;
if (userSelect != StyleUserSelect::Auto &&
userSelect != StyleUserSelect::All) {
break;
}
if (userSelect == StyleUserSelect::All ||
frame->IsGeneratedContentFrame()) {
adjustedFrame = frame;
}
}
return adjustedFrame;
}
nsIFrame::ContentOffsets nsIFrame::GetContentOffsetsFromPoint(
const nsPoint& aPoint, uint32_t aFlags) {
nsIFrame* adjustedFrame;
if (aFlags & IGNORE_SELECTION_STYLE) {
adjustedFrame = this;
} else {
// This section of code deals with special selection styles. Note that
// -moz-all exists, even though it doesn't need to be explicitly handled.
//
// The offset is forced not to end up in generated content; content offsets
// cannot represent content outside of the document's content tree.
adjustedFrame = AdjustFrameForSelectionStyles(this);
// -moz-user-select: all needs special handling, because clicking on it
// should lead to the whole frame being selected
if (adjustedFrame->StyleUIReset()->mUserSelect == StyleUserSelect::All) {
nsPoint adjustedPoint = aPoint + this->GetOffsetTo(adjustedFrame);
return OffsetsForSingleFrame(adjustedFrame, adjustedPoint);
}
// For other cases, try to find a closest frame starting from the parent of
// the unselectable frame
if (adjustedFrame != this) adjustedFrame = adjustedFrame->GetParent();
}
nsPoint adjustedPoint = aPoint + this->GetOffsetTo(adjustedFrame);
FrameTarget closest =
GetSelectionClosestFrame(adjustedFrame, adjustedPoint, aFlags);
// If the correct offset is at one end of a frame, use offset-based
// calculation method
if (closest.frameEdge) {
ContentOffsets offsets;
FrameContentRange range = GetRangeForFrame(closest.frame);
offsets.content = range.content;
if (closest.afterFrame)
offsets.offset = range.end;
else
offsets.offset = range.start;
offsets.secondaryOffset = offsets.offset;
offsets.associate = offsets.offset == range.start ? CARET_ASSOCIATE_AFTER
: CARET_ASSOCIATE_BEFORE;
return offsets;
}
nsPoint pt;
if (closest.frame != this) {
if (nsSVGUtils::IsInSVGTextSubtree(closest.frame)) {
pt = nsLayoutUtils::TransformAncestorPointToFrame(closest.frame, aPoint,
this);
} else {
pt = aPoint - closest.frame->GetOffsetTo(this);
}
} else {
pt = aPoint;
}
return static_cast<nsFrame*>(closest.frame)
->CalcContentOffsetsFromFramePoint(pt);
// XXX should I add some kind of offset standardization?
// consider <b>xxxxx</b><i>zzzzz</i>; should any click between the last
// x and first z put the cursor in the same logical position in addition
// to the same visual position?
}
nsIFrame::ContentOffsets nsFrame::CalcContentOffsetsFromFramePoint(
const nsPoint& aPoint) {
return OffsetsForSingleFrame(this, aPoint);
}
void nsIFrame::AssociateImage(const nsStyleImage& aImage,
nsPresContext* aPresContext,
uint32_t aImageLoaderFlags) {
if (aImage.GetType() != eStyleImageType_Image) {
return;
}
imgRequestProxy* req = aImage.GetImageData();
if (!req) {
return;
}
mozilla::css::ImageLoader* loader =
aPresContext->Document()->StyleImageLoader();
// If this fails there's not much we can do ...
loader->AssociateRequestToFrame(req, this, aImageLoaderFlags);
}
nsresult nsFrame::GetCursor(const nsPoint& aPoint, nsIFrame::Cursor& aCursor) {
FillCursorInformationFromStyle(StyleUI(), aCursor);
if (NS_STYLE_CURSOR_AUTO == aCursor.mCursor) {
// If this is editable, I-beam cursor is better for most elements.
aCursor.mCursor = (mContent && mContent->IsEditable())
? NS_STYLE_CURSOR_TEXT
: NS_STYLE_CURSOR_DEFAULT;
}
if (NS_STYLE_CURSOR_TEXT == aCursor.mCursor &&
GetWritingMode().IsVertical()) {
// Per CSS UI spec, UA may treat value 'text' as
// 'vertical-text' for vertical text.
aCursor.mCursor = NS_STYLE_CURSOR_VERTICAL_TEXT;
}
return NS_OK;
}
// Resize and incremental reflow
/* virtual */ void nsFrame::MarkIntrinsicISizesDirty() {
// This version is meant only for what used to be box-to-block adaptors.
// It should not be called by other derived classes.
if (::IsXULBoxWrapped(this)) {
nsBoxLayoutMetrics* metrics = BoxMetrics();
SizeNeedsRecalc(metrics->mPrefSize);
SizeNeedsRecalc(metrics->mMinSize);
SizeNeedsRecalc(metrics->mMaxSize);
SizeNeedsRecalc(metrics->mBlockPrefSize);
SizeNeedsRecalc(metrics->mBlockMinSize);
CoordNeedsRecalc(metrics->mFlex);
CoordNeedsRecalc(metrics->mAscent);
}
// If we're a flex item, clear our flex-item-specific cached measurements
// (which likely depended on our now-stale intrinsic isize).
auto* parentFrame = GetParent();
if (parentFrame && parentFrame->IsFlexContainerFrame()) {
nsFlexContainerFrame::MarkCachedFlexMeasurementsDirty(this);
}
if (GetStateBits() & NS_FRAME_FONT_INFLATION_FLOW_ROOT) {
nsFontInflationData::MarkFontInflationDataTextDirty(this);
}
}
/* virtual */ nscoord nsFrame::GetMinISize(gfxContext* aRenderingContext) {
nscoord result = 0;
DISPLAY_MIN_INLINE_SIZE(this, result);
return result;
}
/* virtual */ nscoord nsFrame::GetPrefISize(gfxContext* aRenderingContext) {
nscoord result = 0;
DISPLAY_PREF_INLINE_SIZE(this, result);
return result;
}
/* virtual */ void nsFrame::AddInlineMinISize(
gfxContext* aRenderingContext, nsIFrame::InlineMinISizeData* aData) {
nscoord isize = nsLayoutUtils::IntrinsicForContainer(
aRenderingContext, this, nsLayoutUtils::MIN_ISIZE);
aData->DefaultAddInlineMinISize(this, isize);
}
/* virtual */ void nsFrame::AddInlinePrefISize(
gfxContext* aRenderingContext, nsIFrame::InlinePrefISizeData* aData) {
nscoord isize = nsLayoutUtils::IntrinsicForContainer(
aRenderingContext, this, nsLayoutUtils::PREF_ISIZE);
aData->DefaultAddInlinePrefISize(isize);
}
void nsIFrame::InlineMinISizeData::DefaultAddInlineMinISize(nsIFrame* aFrame,
nscoord aISize,
bool aAllowBreak) {
auto parent = aFrame->GetParent();
MOZ_ASSERT(parent, "Must have a parent if we get here!");
const bool mayBreak = aAllowBreak && !aFrame->CanContinueTextRun() &&
!parent->Style()->ShouldSuppressLineBreak() &&
parent->StyleText()->WhiteSpaceCanWrap(parent);
if (mayBreak) {
OptionallyBreak();
}
mTrailingWhitespace = 0;
mSkipWhitespace = false;
mCurrentLine += aISize;
mAtStartOfLine = false;
if (mayBreak) {
OptionallyBreak();
}
}
void nsIFrame::InlinePrefISizeData::DefaultAddInlinePrefISize(nscoord aISize) {
mCurrentLine = NSCoordSaturatingAdd(mCurrentLine, aISize);
mTrailingWhitespace = 0;
mSkipWhitespace = false;
mLineIsEmpty = false;
}
void nsIFrame::InlineMinISizeData::ForceBreak() {
mCurrentLine -= mTrailingWhitespace;
mPrevLines = std::max(mPrevLines, mCurrentLine);
mCurrentLine = mTrailingWhitespace = 0;
for (uint32_t i = 0, i_end = mFloats.Length(); i != i_end; ++i) {
nscoord float_min = mFloats[i].Width();
if (float_min > mPrevLines) mPrevLines = float_min;
}
mFloats.Clear();
mSkipWhitespace = true;
}
void nsIFrame::InlineMinISizeData::OptionallyBreak(nscoord aHyphenWidth) {
// If we can fit more content into a smaller width by staying on this
// line (because we're still at a negative offset due to negative
// text-indent or negative margin), don't break. Otherwise, do the
// same as ForceBreak. it doesn't really matter when we accumulate
// floats.
if (mCurrentLine + aHyphenWidth < 0 || mAtStartOfLine) return;
mCurrentLine += aHyphenWidth;
ForceBreak();
}
void nsIFrame::InlinePrefISizeData::ForceBreak(StyleClear aBreakType) {
MOZ_ASSERT(aBreakType == StyleClear::None || aBreakType == StyleClear::Both ||
aBreakType == StyleClear::Left ||
aBreakType == StyleClear::Right,
"Must be a physical break type");
// If this force break is not clearing any float, we can leave all the
// floats to the next force break.
if (mFloats.Length() != 0 && aBreakType != StyleClear::None) {
// preferred widths accumulated for floats that have already
// been cleared past
nscoord floats_done = 0,
// preferred widths accumulated for floats that have not yet
// been cleared past
floats_cur_left = 0, floats_cur_right = 0;
for (uint32_t i = 0, i_end = mFloats.Length(); i != i_end; ++i) {
const FloatInfo& floatInfo = mFloats[i];
const nsStyleDisplay* floatDisp = floatInfo.Frame()->StyleDisplay();
StyleClear breakType = floatDisp->mBreakType;
if (breakType == StyleClear::Left || breakType == StyleClear::Right ||
breakType == StyleClear::Both) {
nscoord floats_cur =
NSCoordSaturatingAdd(floats_cur_left, floats_cur_right);
if (floats_cur > floats_done) {
floats_done = floats_cur;
}
if (breakType != StyleClear::Right) {
floats_cur_left = 0;
}
if (breakType != StyleClear::Left) {
floats_cur_right = 0;
}
}
StyleFloat floatStyle = floatDisp->mFloat;
nscoord& floats_cur =
floatStyle == StyleFloat::Left ? floats_cur_left : floats_cur_right;
nscoord floatWidth = floatInfo.Width();
// Negative-width floats don't change the available space so they
// shouldn't change our intrinsic line width either.
floats_cur = NSCoordSaturatingAdd(floats_cur, std::max(0, floatWidth));
}
nscoord floats_cur =
NSCoordSaturatingAdd(floats_cur_left, floats_cur_right);
if (floats_cur > floats_done) floats_done = floats_cur;
mCurrentLine = NSCoordSaturatingAdd(mCurrentLine, floats_done);
if (aBreakType == StyleClear::Both) {
mFloats.Clear();
} else {
// If the break type does not clear all floats, it means there may
// be some floats whose isize should contribute to the intrinsic
// isize of the next line. The code here scans the current mFloats
// and keeps floats which are not cleared by this break. Note that
// floats may be cleared directly or indirectly. See below.
nsTArray<FloatInfo> newFloats;
MOZ_ASSERT(
aBreakType == StyleClear::Left || aBreakType == StyleClear::Right,
"Other values should have been handled in other branches");
StyleFloat clearFloatType =
aBreakType == StyleClear::Left ? StyleFloat::Left : StyleFloat::Right;
// Iterate the array in reverse so that we can stop when there are
// no longer any floats we need to keep. See below.
for (FloatInfo& floatInfo : Reversed(mFloats)) {
const nsStyleDisplay* floatDisp = floatInfo.Frame()->StyleDisplay();
if (floatDisp->mFloat != clearFloatType) {
newFloats.AppendElement(floatInfo);
} else {
// This is a float on the side that this break directly clears
// which means we're not keeping it in mFloats. However, if
// this float clears floats on the opposite side (via a value
// of either 'both' or one of 'left'/'right'), any remaining
// (earlier) floats on that side would be indirectly cleared
// as well. Thus, we should break out of this loop and stop
// considering earlier floats to be kept in mFloats.
StyleClear floatBreakType = floatDisp->mBreakType;
if (floatBreakType != aBreakType &&
floatBreakType != StyleClear::None) {
break;
}
}
}
newFloats.Reverse();
mFloats = std::move(newFloats);
}
}
mCurrentLine =
NSCoordSaturatingSubtract(mCurrentLine, mTrailingWhitespace, nscoord_MAX);
mPrevLines = std::max(mPrevLines, mCurrentLine);
mCurrentLine = mTrailingWhitespace = 0;
mSkipWhitespace = true;
mLineIsEmpty = true;
}
static nscoord ResolveMargin(const nsStyleCoord& aStyle,
nscoord aPercentageBasis) {
if (aStyle.GetUnit() == eStyleUnit_Auto) {
return nscoord(0);
}
return nsLayoutUtils::ResolveToLength<false>(aStyle, aPercentageBasis);
}
static nscoord ResolvePadding(const nsStyleCoord& aStyle,
nscoord aPercentageBasis) {
return nsLayoutUtils::ResolveToLength<true>(aStyle, aPercentageBasis);
}
static nsIFrame::IntrinsicISizeOffsetData IntrinsicSizeOffsets(
nsIFrame* aFrame, nscoord aPercentageBasis, bool aForISize) {
nsIFrame::IntrinsicISizeOffsetData result;
WritingMode wm = aFrame->GetWritingMode();
const auto& margin = aFrame->StyleMargin()->mMargin;
bool verticalAxis = aForISize == wm.IsVertical();
if (verticalAxis) {
result.hMargin += ResolveMargin(margin.GetTop(), aPercentageBasis);
result.hMargin += ResolveMargin(margin.GetBottom(), aPercentageBasis);
} else {
result.hMargin += ResolveMargin(margin.GetLeft(), aPercentageBasis);
result.hMargin += ResolveMargin(margin.GetRight(), aPercentageBasis);
}
const auto& padding = aFrame->StylePadding()->mPadding;
if (verticalAxis) {
result.hPadding += ResolvePadding(padding.GetTop(), aPercentageBasis);
result.hPadding += ResolvePadding(padding.GetBottom(), aPercentageBasis);
} else {
result.hPadding += ResolvePadding(padding.GetLeft(), aPercentageBasis);
result.hPadding += ResolvePadding(padding.GetRight(), aPercentageBasis);
}
const nsStyleBorder* styleBorder = aFrame->StyleBorder();
if (verticalAxis) {
result.hBorder += styleBorder->GetComputedBorderWidth(eSideTop);
result.hBorder += styleBorder->GetComputedBorderWidth(eSideBottom);
} else {
result.hBorder += styleBorder->GetComputedBorderWidth(eSideLeft);
result.hBorder += styleBorder->GetComputedBorderWidth(eSideRight);
}
const nsStyleDisplay* disp = aFrame->StyleDisplay();
if (aFrame->IsThemed(disp)) {
nsPresContext* presContext = aFrame->PresContext();
LayoutDeviceIntMargin border = presContext->GetTheme()->GetWidgetBorder(
presContext->DeviceContext(), aFrame, disp->mAppearance);
result.hBorder = presContext->DevPixelsToAppUnits(
verticalAxis ? border.TopBottom() : border.LeftRight());
LayoutDeviceIntMargin padding;
if (presContext->GetTheme()->GetWidgetPadding(presContext->DeviceContext(),
aFrame, disp->mAppearance,
&padding)) {
result.hPadding = presContext->DevPixelsToAppUnits(
verticalAxis ? padding.TopBottom() : padding.LeftRight());
}
}
return result;
}
/* virtual */ nsIFrame::IntrinsicISizeOffsetData nsFrame::IntrinsicISizeOffsets(
nscoord aPercentageBasis) {
return IntrinsicSizeOffsets(this, aPercentageBasis, true);
}
nsIFrame::IntrinsicISizeOffsetData nsIFrame::IntrinsicBSizeOffsets(
nscoord aPercentageBasis) {
return IntrinsicSizeOffsets(this, aPercentageBasis, false);
}
/* virtual */ IntrinsicSize nsFrame::GetIntrinsicSize() {
return IntrinsicSize(); // default is width/height set to eStyleUnit_None
}
/* virtual */ nsSize nsFrame::GetIntrinsicRatio() { return nsSize(0, 0); }
/* virtual */
LogicalSize nsFrame::ComputeSize(gfxContext* aRenderingContext, WritingMode aWM,
const LogicalSize& aCBSize,
nscoord aAvailableISize,
const LogicalSize& aMargin,
const LogicalSize& aBorder,
const LogicalSize& aPadding,
ComputeSizeFlags aFlags) {
MOZ_ASSERT(GetIntrinsicRatio() == nsSize(0, 0),
"Please override this method and call "
"nsFrame::ComputeSizeWithIntrinsicDimensions instead.");
LogicalSize result =
ComputeAutoSize(aRenderingContext, aWM, aCBSize, aAvailableISize, aMargin,
aBorder, aPadding, aFlags);
const nsStylePosition* stylePos = StylePosition();
LogicalSize boxSizingAdjust(aWM);
if (stylePos->mBoxSizing == StyleBoxSizing::Border) {
boxSizingAdjust = aBorder + aPadding;
}
nscoord boxSizingToMarginEdgeISize = aMargin.ISize(aWM) + aBorder.ISize(aWM) +
aPadding.ISize(aWM) -
boxSizingAdjust.ISize(aWM);
const nsStyleCoord* inlineStyleCoord = &stylePos->ISize(aWM);
const nsStyleCoord* blockStyleCoord = &stylePos->BSize(aWM);
auto parentFrame = GetParent();
auto alignCB = parentFrame;
bool isGridItem = parentFrame && parentFrame->IsGridContainerFrame() &&
!HasAnyStateBits(NS_FRAME_OUT_OF_FLOW);
if (parentFrame && parentFrame->IsTableWrapperFrame() && IsTableFrame()) {
// An inner table frame is sized as a grid item if its table wrapper is,
// because they actually have the same CB (the wrapper's CB).
// @see ReflowInput::InitCBReflowInput
auto tableWrapper = GetParent();
auto grandParent = tableWrapper->GetParent();
isGridItem = (grandParent->IsGridContainerFrame() &&
!(tableWrapper->GetStateBits() & NS_FRAME_OUT_OF_FLOW));
if (isGridItem) {
// When resolving justify/align-self below, we want to use the grid
// container's justify/align-items value and WritingMode.
alignCB = grandParent;
}
}
bool isFlexItem =
parentFrame && parentFrame->IsFlexContainerFrame() &&
!parentFrame->HasAnyStateBits(NS_STATE_FLEX_IS_EMULATING_LEGACY_BOX) &&
!HasAnyStateBits(NS_FRAME_OUT_OF_FLOW);
// This variable only gets set (and used) if isFlexItem is true. It
// indicates which axis (in this frame's own WM) corresponds to its
// flex container's main axis.
LogicalAxis flexMainAxis =
eLogicalAxisInline; // (init to make valgrind happy)
if (isFlexItem) {
// Flex items use their "flex-basis" property in place of their main-size
// property for sizing purposes, *unless* they have "flex-basis:auto", in
// which case they use their main-size property after all.
flexMainAxis = nsFlexContainerFrame::IsItemInlineAxisMainAxis(this)
? eLogicalAxisInline
: eLogicalAxisBlock;
// NOTE: The logic here should match the similar chunk for updating
// mainAxisCoord in nsFrame::ComputeSizeWithIntrinsicDimensions() (aside
// from using a different dummy value in the IsUsedFlexBasisContent() case).
const nsStyleCoord* flexBasis = &(stylePos->mFlexBasis);
auto& mainAxisCoord =
(flexMainAxis == eLogicalAxisInline ? inlineStyleCoord
: blockStyleCoord);
// NOTE: If we're a table-wrapper frame, we skip this clause and just stick
// with 'main-size:auto' behavior (which -- unlike 'content'
// i.e. 'max-content' -- will give us the ability to honor percent sizes on
// our table-box child when resolving the flex base size). The flexbox spec
// doesn't call for this special case, but webcompat & regression-avoidance
// seems to require it, for the time being... Tables sure are special.
if (nsFlexContainerFrame::IsUsedFlexBasisContent(flexBasis,
mainAxisCoord) &&
MOZ_LIKELY(!IsTableWrapperFrame())) {
static const nsStyleCoord maxContStyleCoord(NS_STYLE_WIDTH_MAX_CONTENT,
eStyleUnit_Enumerated);
mainAxisCoord = &maxContStyleCoord;
// (Note: if our main axis is the block axis, then this 'max-content'
// value will be treated like 'auto', via the IsAutoBSize() call below.)
} else if (flexBasis->GetUnit() != eStyleUnit_Auto) {
// For all other non-'auto' flex-basis values, we just swap in the
// flex-basis itself for the main-size property.
mainAxisCoord = flexBasis;
} // else: flex-basis is 'auto', which is deferring to some explicit value
// in mainAxisCoord. So we proceed w/o touching mainAxisCoord.
}
// Compute inline-axis size
if (inlineStyleCoord->GetUnit() != eStyleUnit_Auto) {
result.ISize(aWM) = ComputeISizeValue(
aRenderingContext, aCBSize.ISize(aWM), boxSizingAdjust.ISize(aWM),
boxSizingToMarginEdgeISize, *inlineStyleCoord, aFlags);
} else if (MOZ_UNLIKELY(isGridItem) && !IS_TRUE_OVERFLOW_CONTAINER(this)) {
// 'auto' inline-size for grid-level box - fill the CB for 'stretch' /
// 'normal' and clamp it to the CB if requested:
bool stretch = false;
if (!(aFlags & nsIFrame::eShrinkWrap) &&
!StyleMargin()->HasInlineAxisAuto(aWM)) {
auto inlineAxisAlignment =
aWM.IsOrthogonalTo(alignCB->GetWritingMode())
? StylePosition()->UsedAlignSelf(alignCB->Style())
: StylePosition()->UsedJustifySelf(alignCB->Style());
stretch = inlineAxisAlignment == NS_STYLE_ALIGN_NORMAL ||
inlineAxisAlignment == NS_STYLE_ALIGN_STRETCH;
}
if (stretch || (aFlags & ComputeSizeFlags::eIClampMarginBoxMinSize)) {
auto iSizeToFillCB =
std::max(nscoord(0), aCBSize.ISize(aWM) - aPadding.ISize(aWM) -
aBorder.ISize(aWM) - aMargin.ISize(aWM));
if (stretch || result.ISize(aWM) > iSizeToFillCB) {
result.ISize(aWM) = iSizeToFillCB;
}
}
}
// Flex items ignore their min & max sizing properties in their
// flex container's main-axis. (Those properties get applied later in
// the flexbox algorithm.)
const nsStyleCoord& maxISizeCoord = stylePos->MaxISize(aWM);
nscoord maxISize = NS_UNCONSTRAINEDSIZE;
if (maxISizeCoord.GetUnit() != eStyleUnit_None &&
!(isFlexItem && flexMainAxis == eLogicalAxisInline)) {
maxISize = ComputeISizeValue(
aRenderingContext, aCBSize.ISize(aWM), boxSizingAdjust.ISize(aWM),
boxSizingToMarginEdgeISize, maxISizeCoord, aFlags);
result.ISize(aWM) = std::min(maxISize, result.ISize(aWM));
}
const nsStyleCoord& minISizeCoord = stylePos->MinISize(aWM);
nscoord minISize;
if (minISizeCoord.GetUnit() != eStyleUnit_Auto &&
!(isFlexItem && flexMainAxis == eLogicalAxisInline)) {
minISize = ComputeISizeValue(
aRenderingContext, aCBSize.ISize(aWM), boxSizingAdjust.ISize(aWM),
boxSizingToMarginEdgeISize, minISizeCoord, aFlags);
} else if (MOZ_UNLIKELY(aFlags & eIApplyAutoMinSize)) {
// This implements "Implied Minimum Size of Grid Items".
// https://drafts.csswg.org/css-grid/#min-size-auto
minISize = std::min(maxISize, GetMinISize(aRenderingContext));
if (inlineStyleCoord->IsCoordPercentCalcUnit()) {
minISize = std::min(minISize, result.ISize(aWM));
} else if (aFlags & eIClampMarginBoxMinSize) {
// "if the grid item spans only grid tracks that have a fixed max track
// sizing function, its automatic minimum size in that dimension is
// further clamped to less than or equal to the size necessary to fit
// its margin box within the resulting grid area (flooring at zero)"
// https://drafts.csswg.org/css-grid/#min-size-auto
auto maxMinISize =
std::max(nscoord(0), aCBSize.ISize(aWM) - aPadding.ISize(aWM) -
aBorder.ISize(aWM) - aMargin.ISize(aWM));
minISize = std::min(minISize, maxMinISize);
}
} else {
// Treat "min-width: auto" as 0.
// NOTE: Technically, "auto" is supposed to behave like "min-content" on
// flex items. However, we don't need to worry about that here, because
// flex items' min-sizes are intentionally ignored until the flex
// container explicitly considers them during space distribution.
minISize = 0;
}
result.ISize(aWM) = std::max(minISize, result.ISize(aWM));
// Compute block-axis size
// (but not if we have auto bsize or if we received the "eUseAutoBSize"
// flag -- then, we'll just stick with the bsize that we already calculated
// in the initial ComputeAutoSize() call.)
if (!(aFlags & nsIFrame::eUseAutoBSize)) {
if (!nsLayoutUtils::IsAutoBSize(*blockStyleCoord, aCBSize.BSize(aWM))) {
result.BSize(aWM) = nsLayoutUtils::ComputeBSizeValue(
aCBSize.BSize(aWM), boxSizingAdjust.BSize(aWM), *blockStyleCoord);
} else if (MOZ_UNLIKELY(isGridItem) && blockStyleCoord->IsAutoOrEnum() &&
!IS_TRUE_OVERFLOW_CONTAINER(this)) {
auto cbSize = aCBSize.BSize(aWM);
if (cbSize != NS_AUTOHEIGHT) {
// 'auto' block-size for grid-level box - fill the CB for 'stretch' /
// 'normal' and clamp it to the CB if requested:
bool stretch = false;
if (!StyleMargin()->HasBlockAxisAuto(aWM)) {
auto blockAxisAlignment =
!aWM.IsOrthogonalTo(alignCB->GetWritingMode())
? StylePosition()->UsedAlignSelf(alignCB->Style())
: StylePosition()->UsedJustifySelf(alignCB->Style());
stretch = blockAxisAlignment == NS_STYLE_ALIGN_NORMAL ||
blockAxisAlignment == NS_STYLE_ALIGN_STRETCH;
}
if (stretch || (aFlags & ComputeSizeFlags::eBClampMarginBoxMinSize)) {
auto bSizeToFillCB =
std::max(nscoord(0), cbSize - aPadding.BSize(aWM) -
aBorder.BSize(aWM) - aMargin.BSize(aWM));
if (stretch || (result.BSize(aWM) != NS_AUTOHEIGHT &&
result.BSize(aWM) > bSizeToFillCB)) {
result.BSize(aWM) = bSizeToFillCB;
}
}
}
}
}
const nsStyleCoord& maxBSizeCoord = stylePos->MaxBSize(aWM);
if (result.BSize(aWM) != NS_UNCONSTRAINEDSIZE) {
if (!nsLayoutUtils::IsAutoBSize(maxBSizeCoord, aCBSize.BSize(aWM)) &&
!(isFlexItem && flexMainAxis == eLogicalAxisBlock)) {
nscoord maxBSize = nsLayoutUtils::ComputeBSizeValue(
aCBSize.BSize(aWM), boxSizingAdjust.BSize(aWM), maxBSizeCoord);
result.BSize(aWM) = std::min(maxBSize, result.BSize(aWM));
}
const nsStyleCoord& minBSizeCoord = stylePos->MinBSize(aWM);
if (!nsLayoutUtils::IsAutoBSize(minBSizeCoord, aCBSize.BSize(aWM)) &&
!(isFlexItem && flexMainAxis == eLogicalAxisBlock)) {
nscoord minBSize = nsLayoutUtils::ComputeBSizeValue(
aCBSize.BSize(aWM), boxSizingAdjust.BSize(aWM), minBSizeCoord);
result.BSize(aWM) = std::max(minBSize, result.BSize(aWM));
}
}
const nsStyleDisplay* disp = StyleDisplay();
if (IsThemed(disp)) {
LayoutDeviceIntSize widget;
bool canOverride = true;
nsPresContext* presContext = PresContext();
presContext->GetTheme()->GetMinimumWidgetSize(
presContext, this, disp->mAppearance, &widget, &canOverride);
// Convert themed widget's physical dimensions to logical coords
LogicalSize size(aWM,
nsSize(presContext->DevPixelsToAppUnits(widget.width),
presContext->DevPixelsToAppUnits(widget.height)));
// GMWS() returns border-box; we need content-box
size.ISize(aWM) -= aBorder.ISize(aWM) + aPadding.ISize(aWM);
size.BSize(aWM) -= aBorder.BSize(aWM) + aPadding.BSize(aWM);
if (size.BSize(aWM) > result.BSize(aWM) || !canOverride) {
result.BSize(aWM) = size.BSize(aWM);
}
if (size.ISize(aWM) > result.ISize(aWM) || !canOverride) {
result.ISize(aWM) = size.ISize(aWM);
}
}
result.ISize(aWM) = std::max(0, result.ISize(aWM));
result.BSize(aWM) = std::max(0, result.BSize(aWM));
return result;
}
LogicalSize nsFrame::ComputeSizeWithIntrinsicDimensions(
gfxContext* aRenderingContext, WritingMode aWM,
const IntrinsicSize& aIntrinsicSize, nsSize aIntrinsicRatio,
const LogicalSize& aCBSize, const LogicalSize& aMargin,
const LogicalSize& aBorder, const LogicalSize& aPadding,
ComputeSizeFlags aFlags) {
const nsStylePosition* stylePos = StylePosition();
const nsStyleCoord* inlineStyleCoord = &stylePos->ISize(aWM);
const nsStyleCoord* blockStyleCoord = &stylePos->BSize(aWM);
auto* parentFrame = GetParent();
const bool isGridItem = parentFrame && parentFrame->IsGridContainerFrame() &&
!HasAnyStateBits(NS_FRAME_OUT_OF_FLOW);
const bool isFlexItem =
parentFrame && parentFrame->IsFlexContainerFrame() &&
!parentFrame->HasAnyStateBits(NS_STATE_FLEX_IS_EMULATING_LEGACY_BOX) &&
!HasAnyStateBits(NS_FRAME_OUT_OF_FLOW);
// This variable only gets set (and used) if isFlexItem is true. It
// indicates which axis (in this frame's own WM) corresponds to its
// flex container's main axis.
LogicalAxis flexMainAxis =
eLogicalAxisInline; // (init to make valgrind happy)
Maybe<nsStyleCoord> imposedMainSizeStyleCoord;
// If this is a flex item, and we're measuring its cross size after flexing
// to resolve its main size, then we need to use the resolved main size
// that the container provides to us *instead of* the main-size coordinate
// from our style struct. (Otherwise, we'll be using an irrelevant value in
// the aspect-ratio calculations below.)
if (isFlexItem) {
flexMainAxis = nsFlexContainerFrame::IsItemInlineAxisMainAxis(this)
? eLogicalAxisInline
: eLogicalAxisBlock;
// If FlexItemMainSizeOverride frame-property is set, then that means the
// flex container is imposing a main-size on this flex item for it to use
// as its size in the container's main axis.
bool didImposeMainSize;
nscoord imposedMainSize =
GetProperty(nsIFrame::FlexItemMainSizeOverride(), &didImposeMainSize);
if (didImposeMainSize) {
imposedMainSizeStyleCoord.emplace(imposedMainSize,
nsStyleCoord::CoordConstructor);
if (flexMainAxis == eLogicalAxisInline) {
inlineStyleCoord = imposedMainSizeStyleCoord.ptr();
} else {
blockStyleCoord = imposedMainSizeStyleCoord.ptr();
}
} else {
// Flex items use their "flex-basis" property in place of their main-size
// property (e.g. "width") for sizing purposes, *unless* they have
// "flex-basis:auto", in which case they use their main-size property
// after all.
// NOTE: The logic here should match the similar chunk for updating
// mainAxisCoord in nsFrame::ComputeSize() (aside from using a different
// dummy value in the IsUsedFlexBasisContent() case).
const nsStyleCoord* flexBasis = &(stylePos->mFlexBasis);
auto& mainAxisCoord =
(flexMainAxis == eLogicalAxisInline ? inlineStyleCoord
: blockStyleCoord);
if (nsFlexContainerFrame::IsUsedFlexBasisContent(flexBasis,
mainAxisCoord)) {
// If we get here, we're resolving the flex base size for a flex item,
// and we fall into the flexbox spec section 9.2 step 3, substep C (if
// we have a definite cross size) or E (if not). And specifically:
//
// * If we have a definite cross size, we're supposed to resolve our
// main-size based on that and our intrinsic ratio.
// * Otherwise, we're supposed to produce our max-content size.
//
// Conveniently, we can handle both of those scenarios (regardless of
// which substep we fall into) by using the 'auto' keyword for our
// main-axis coordinate here. (This makes sense, because the spec is
// effectively trying to produce the 'auto' sizing behavior).
static const nsStyleCoord autoStyleCoord(eStyleUnit_Auto);
mainAxisCoord = &autoStyleCoord;
} else if (flexBasis->GetUnit() != eStyleUnit_Auto) {
// For all other non-'auto' flex-basis values, we just swap in the
// flex-basis itself for the main-size property.
mainAxisCoord = flexBasis;
} // else: flex-basis is 'auto', which is deferring to some explicit
// value in mainAxisCoord. So we proceed w/o touching mainAxisCoord.
}
}
// Handle intrinsic sizes and their interaction with
// {min-,max-,}{width,height} according to the rules in
// http://www.w3.org/TR/CSS21/visudet.html#min-max-widths
// Note: throughout the following section of the function, I avoid
// a * (b / c) because of its reduced accuracy relative to a * b / c
// or (a * b) / c (which are equivalent).
const bool isAutoISize = inlineStyleCoord->GetUnit() == eStyleUnit_Auto;
const bool isAutoBSize =
nsLayoutUtils::IsAutoBSize(*blockStyleCoord, aCBSize.BSize(aWM));
LogicalSize boxSizingAdjust(aWM);
if (stylePos->mBoxSizing == StyleBoxSizing::Border) {
boxSizingAdjust = aBorder + aPadding;
}
nscoord boxSizingToMarginEdgeISize = aMargin.ISize(aWM) + aBorder.ISize(aWM) +
aPadding.ISize(aWM) -
boxSizingAdjust.ISize(aWM);
nscoord iSize, minISize, maxISize, bSize, minBSize, maxBSize;
enum class Stretch {
// stretch to fill the CB (preserving intrinsic ratio) in the relevant axis
eStretchPreservingRatio, // XXX not used yet
// stretch to fill the CB in the relevant axis
eStretch,
// no stretching in the relevant axis
eNoStretch,
};
// just to avoid having to type these out everywhere:
const auto eStretchPreservingRatio = Stretch::eStretchPreservingRatio;
const auto eStretch = Stretch::eStretch;
const auto eNoStretch = Stretch::eNoStretch;
Stretch stretchI = eNoStretch; // stretch behavior in the inline axis
Stretch stretchB = eNoStretch; // stretch behavior in the block axis
const bool isVertical = aWM.IsVertical();
const nsStyleCoord& isizeCoord =
isVertical ? aIntrinsicSize.height : aIntrinsicSize.width;
const bool hasIntrinsicISize = isizeCoord.GetUnit() == eStyleUnit_Coord;
nscoord intrinsicISize;
if (hasIntrinsicISize) {
intrinsicISize = std::max(nscoord(0), isizeCoord.GetCoordValue());
} else {
NS_ASSERTION(isizeCoord.GetUnit() == eStyleUnit_None, "unexpected unit");
intrinsicISize = 0;
}
const nsStyleCoord& bsizeCoord =
isVertical ? aIntrinsicSize.width : aIntrinsicSize.height;
const bool hasIntrinsicBSize = bsizeCoord.GetUnit() == eStyleUnit_Coord;
nscoord intrinsicBSize;
if (hasIntrinsicBSize) {
intrinsicBSize = std::max(nscoord(0), bsizeCoord.GetCoordValue());
} else {
NS_ASSERTION(bsizeCoord.GetUnit() == eStyleUnit_None, "unexpected unit");
intrinsicBSize = 0;
}
NS_ASSERTION(aIntrinsicRatio.width >= 0 && aIntrinsicRatio.height >= 0,
"Intrinsic ratio has a negative component!");
LogicalSize logicalRatio(aWM, aIntrinsicRatio);
if (!isAutoISize) {
iSize = ComputeISizeValue(
aRenderingContext, aCBSize.ISize(aWM), boxSizingAdjust.ISize(aWM),
boxSizingToMarginEdgeISize, *inlineStyleCoord, aFlags);
} else if (MOZ_UNLIKELY(isGridItem)) {
MOZ_ASSERT(!IS_TRUE_OVERFLOW_CONTAINER(this));
// 'auto' inline-size for grid-level box - apply 'stretch' as needed:
auto cbSize = aCBSize.ISize(aWM);
if (cbSize != NS_UNCONSTRAINEDSIZE) {
if (!StyleMargin()->HasInlineAxisAuto(aWM)) {
auto inlineAxisAlignment =
aWM.IsOrthogonalTo(GetParent()->GetWritingMode())
? stylePos->UsedAlignSelf(GetParent()->Style())
: stylePos->UsedJustifySelf(GetParent()->Style());
// Note: 'normal' means 'start' for elements with an intrinsic size
// or ratio in the relevant dimension, otherwise 'stretch'.
// https://drafts.csswg.org/css-grid/#grid-item-sizing
if ((inlineAxisAlignment == NS_STYLE_ALIGN_NORMAL &&
!hasIntrinsicISize && !(logicalRatio.ISize(aWM) > 0)) ||
inlineAxisAlignment == NS_STYLE_ALIGN_STRETCH) {
stretchI = eStretch;
}
}
if (stretchI != eNoStretch ||
(aFlags & ComputeSizeFlags::eIClampMarginBoxMinSize)) {
iSize =
