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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* Copyright (C) 2003-2022 Apple Inc. All rights reserved.
* Copyright (C) 2010, 2012 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#pragma once
#include "HitTestRequest.h"
#include "LengthFunctions.h"
#include "RenderObject.h"
#include <wtf/Packed.h>
namespace WebCore {
class Animation;
class ContentData;
class BlendingKeyframes;
class ReferencedSVGResources;
class RenderBlock;
class RenderStyle;
class RenderTreeBuilder;
struct MarginRect {
LayoutRect marginRect;
LayoutRect anchorRect;
};
namespace Layout {
class ElementBox;
}
class RenderElement : public RenderObject {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED(RenderElement);
WTF_OVERRIDE_DELETE_FOR_CHECKED_PTR(RenderElement);
public:
virtual ~RenderElement();
static bool isContentDataSupported(const ContentData&);
enum class ConstructBlockLevelRendererFor {
Inline = 1 << 0,
ListItem = 1 << 1,
TableOrTablePart = 1 << 2
};
static RenderPtr<RenderElement> createFor(Element&, RenderStyle&&, OptionSet<ConstructBlockLevelRendererFor> = { });
bool hasInitializedStyle() const { return m_hasInitializedStyle; }
const RenderStyle& style() const { return m_style; }
const RenderStyle* parentStyle() const { return !m_parent ? nullptr : &m_parent->style(); }
const RenderStyle& firstLineStyle() const;
// FIXME: Style shouldn't be mutated.
RenderStyle& mutableStyle() { return m_style; }
void initializeStyle();
// Calling with minimalStyleDifference > StyleDifference::Equal indicates that
// out-of-band state (e.g. animations) requires that styleDidChange processing
// continue even if the style isn't different from the current style.
void setStyle(RenderStyle&&, StyleDifference minimalStyleDifference = StyleDifference::Equal);
// The pseudo element style can be cached or uncached. Use the uncached method if the pseudo element
// has the concept of changing state (like ::-webkit-scrollbar-thumb:hover), or if it takes additional
// parameters (like ::highlight(name)).
const RenderStyle* getCachedPseudoStyle(const Style::PseudoElementIdentifier&, const RenderStyle* parentStyle = nullptr) const;
std::unique_ptr<RenderStyle> getUncachedPseudoStyle(const Style::PseudoElementRequest&, const RenderStyle* parentStyle = nullptr, const RenderStyle* ownStyle = nullptr) const;
// This is null for anonymous renderers.
Element* element() const { return downcast<Element>(RenderObject::node()); }
RefPtr<Element> protectedElement() const { return element(); }
Element* nonPseudoElement() const { return downcast<Element>(RenderObject::nonPseudoNode()); }
RefPtr<Element> protectedNonPseudoElement() const { return nonPseudoElement(); }
Element* generatingElement() const;
RenderObject* firstChild() const { return m_firstChild.get(); }
RenderObject* lastChild() const { return m_lastChild.get(); }
RenderObject* firstInFlowChild() const;
RenderObject* lastInFlowChild() const;
Layout::ElementBox* layoutBox();
const Layout::ElementBox* layoutBox() const;
// Note that even if these 2 "canContain" functions return true for a particular renderer, it does not necessarily mean the renderer is the containing block (see containingBlockForAbsolute(Fixed)Position).
inline bool canContainFixedPositionObjects() const;
inline bool canContainAbsolutelyPositionedObjects() const;
bool canEstablishContainingBlockWithTransform() const;
inline bool shouldApplyLayoutContainment() const;
inline bool shouldApplySizeContainment() const;
inline bool shouldApplyInlineSizeContainment() const;
inline bool shouldApplySizeOrInlineSizeContainment() const;
inline bool shouldApplyStyleContainment() const;
inline bool shouldApplyPaintContainment() const;
inline bool shouldApplyAnyContainment() const;
bool hasEligibleContainmentForSizeQuery() const;
Color selectionColor(CSSPropertyID) const;
std::unique_ptr<RenderStyle> selectionPseudoStyle() const;
// Obtains the selection colors that should be used when painting a selection.
Color selectionBackgroundColor() const;
Color selectionForegroundColor() const;
Color selectionEmphasisMarkColor() const;
const RenderStyle* spellingErrorPseudoStyle() const;
const RenderStyle* grammarErrorPseudoStyle() const;
const RenderStyle* targetTextPseudoStyle() const;
virtual bool isChildAllowed(const RenderObject&, const RenderStyle&) const { return true; }
void didAttachChild(RenderObject& child, RenderObject* beforeChild);
// The following functions are used when the render tree hierarchy changes to make sure layers get
// properly added and removed. Since containership can be implemented by any subclass, and since a hierarchy
// can contain a mixture of boxes and other object types, these functions need to be in the base class.
RenderLayer* layerParent() const;
RenderLayer* layerNextSibling(RenderLayer& parentLayer) const;
void removeLayers();
void moveLayers(RenderLayer& newParent);
virtual void dirtyLineFromChangedChild() { }
void setChildNeedsLayout(MarkingBehavior = MarkContainingBlockChain);
void setOutOfFlowChildNeedsStaticPositionLayout();
void clearChildNeedsLayout();
void setNeedsPositionedMovementLayout(const RenderStyle* oldStyle);
void setNeedsLayoutForStyleDifference(StyleDifference, const RenderStyle* oldStyle);
void setNeedsLayoutForOverflowChange();
// paintOffset is the offset from the origin of the GraphicsContext at which to paint the current object.
virtual void paint(PaintInfo&, const LayoutPoint& paintOffset) = 0;
// inline-block elements paint all phases atomically. This function ensures that. Certain other elements
// (grid items, flex items) require this behavior as well, and this function exists as a helper for them.
// It is expected that the caller will call this function independent of the value of paintInfo.phase.
void paintAsInlineBlock(PaintInfo&, const LayoutPoint&);
// Recursive function that computes the size and position of this object and all its descendants.
virtual void layout();
/* This function performs a layout only if one is needed. */
void layoutIfNeeded();
// Updates only the local style ptr of the object. Does not update the state of the object,
// and so only should be called when the style is known not to have changed (or from setStyle).
void setStyleInternal(RenderStyle&& style) { m_style = WTFMove(style); }
// Repaint only if our old bounds and new bounds are different. The caller may pass in newBounds and newOutlineBox if they are known.
bool repaintAfterLayoutIfNeeded(SingleThreadWeakPtr<const RenderLayerModelObject>&& repaintContainer, RequiresFullRepaint, const RepaintRects& oldRects, const RepaintRects& newRects);
void repaintClientsOfReferencedSVGResources() const;
void repaintRendererOrClientsOfReferencedSVGResources() const;
void repaintOldAndNewPositionsForSVGRenderer() const;
bool borderImageIsLoadedAndCanBeRendered() const;
bool isVisibleIgnoringGeometry() const;
bool mayCauseRepaintInsideViewport(const IntRect* visibleRect = nullptr) const;
bool isVisibleInDocumentRect(const IntRect& documentRect) const;
bool isInsideEntirelyHiddenLayer() const;
// Returns true if this renderer requires a new stacking context.
static bool createsGroupForStyle(const RenderStyle&);
bool createsGroup() const { return createsGroupForStyle(style()); }
inline bool isTransparent() const; // FIXME: This function is incorrectly named. It's isNotOpaque, sometimes called hasOpacity, not isEntirelyTransparent.
inline float opacity() const;
inline bool visibleToHitTesting(const std::optional<HitTestRequest>& = std::nullopt) const;
inline bool hasBackground() const;
inline bool hasMask() const;
inline bool hasClip() const;
inline bool hasClipOrNonVisibleOverflow() const;
inline bool hasClipPath() const;
inline bool hasHiddenBackface() const;
bool hasViewTransitionName() const;
bool isViewTransitionRoot() const;
bool requiresRenderingConsolidationForViewTransition() const;
bool hasOutlineAnnotation() const;
inline bool hasOutline() const;
bool hasSelfPaintingLayer() const;
bool checkForRepaintDuringLayout() const;
// absoluteAnchorRect() is conceptually similar to absoluteBoundingBoxRect(), but is intended for scrolling to an
// anchor. For inline renderers, this gets the logical top left of the first leaf child and the logical bottom
// right of the last leaf child, converts them to absolute coordinates, and makes a box out of them.
LayoutRect absoluteAnchorRect(bool* insideFixed = nullptr) const;
// absoluteAnchorRectWithScrollMargin() is similar to absoluteAnchorRect, but it also takes into account any
// CSS scroll-margin that is set in the style of this RenderElement.
MarginRect absoluteAnchorRectWithScrollMargin(bool* insideFixed = nullptr) const;
inline bool hasFilter() const;
inline bool hasBackdropFilter() const;
inline bool hasBlendMode() const;
inline bool hasShapeOutside() const;
#if HAVE(CORE_MATERIAL)
inline bool hasAppleVisualEffect() const;
inline bool hasAppleVisualEffectRequiringBackdropFilter() const;
#endif
void registerForVisibleInViewportCallback();
void unregisterForVisibleInViewportCallback();
VisibleInViewportState visibleInViewportState() const { return static_cast<VisibleInViewportState>(m_visibleInViewportState); }
void setVisibleInViewportState(VisibleInViewportState);
virtual void visibleInViewportStateChanged();
bool didContibuteToVisuallyNonEmptyPixelCount() const { return m_didContributeToVisuallyNonEmptyPixelCount; }
void setDidContibuteToVisuallyNonEmptyPixelCount() { m_didContributeToVisuallyNonEmptyPixelCount = true; }
bool allowsAnimation() const final;
bool repaintForPausedImageAnimationsIfNeeded(const IntRect& visibleRect, CachedImage&);
bool hasPausedImageAnimations() const { return m_hasPausedImageAnimations; }
void setHasPausedImageAnimations(bool b) { m_hasPausedImageAnimations = b; }
bool hasCounterNodeMap() const { return m_hasCounterNodeMap; }
void setHasCounterNodeMap(bool f) { m_hasCounterNodeMap = f; }
#if ENABLE(TEXT_AUTOSIZING)
void adjustComputedFontSizesOnBlocks(float size, float visibleWidth);
WEBCORE_EXPORT void resetTextAutosizing();
#endif
WEBCORE_EXPORT ImageOrientation imageOrientation() const;
void removeFromRenderFragmentedFlow();
virtual void resetEnclosingFragmentedFlowAndChildInfoIncludingDescendants(RenderFragmentedFlow*);
// Called before anonymousChild.setStyle(). Override to set custom styles for
// the child.
virtual void updateAnonymousChildStyle(RenderStyle&) const { };
bool hasContinuationChainNode() const { return m_hasContinuationChainNode; }
bool isContinuation() const { return m_isContinuation; }
void setIsContinuation() { m_isContinuation = true; }
bool isFirstLetter() const { return m_isFirstLetter; }
void setIsFirstLetter() { m_isFirstLetter = true; }
RenderObject* attachRendererInternal(RenderPtr<RenderObject> child, RenderObject* beforeChild);
RenderPtr<RenderObject> detachRendererInternal(RenderObject&);
virtual bool startAnimation(double /* timeOffset */, const Animation&, const BlendingKeyframes&) { return false; }
virtual void animationPaused(double /* timeOffset */, const String& /* name */) { }
virtual void animationFinished(const String& /* name */) { }
virtual void transformRelatedPropertyDidChange() { }
// https://www.w3.org/TR/css-transforms-1/#transform-box
inline FloatRect transformReferenceBoxRect(const RenderStyle&) const;
inline FloatRect transformReferenceBoxRect() const;
// https://www.w3.org/TR/css-transforms-1/#reference-box
virtual FloatRect referenceBoxRect(CSSBoxType) const;
virtual void suspendAnimations(MonotonicTime = MonotonicTime()) { }
std::unique_ptr<RenderStyle> animatedStyle();
SingleThreadWeakPtr<RenderBlockFlow> backdropRenderer() const;
void setBackdropRenderer(RenderBlockFlow&);
ReferencedSVGResources& ensureReferencedSVGResources();
Overflow effectiveOverflowX() const;
Overflow effectiveOverflowY() const;
inline Overflow effectiveOverflowInlineDirection() const;
inline Overflow effectiveOverflowBlockDirection() const;
bool isWritingModeRoot() const { return !parent() || parent()->style().writingMode().computedWritingMode() != style().writingMode().computedWritingMode(); }
bool isDeprecatedFlexItem() const { return !isInline() && !isFloatingOrOutOfFlowPositioned() && parent() && parent()->isRenderDeprecatedFlexibleBox(); }
bool isFlexItemIncludingDeprecated() const { return !isInline() && !isFloatingOrOutOfFlowPositioned() && parent() && parent()->isFlexibleBoxIncludingDeprecated(); }
virtual LayoutRect paintRectToClipOutFromBorder(const LayoutRect&) { return { }; }
void paintFocusRing(const PaintInfo&, const RenderStyle&, const Vector<LayoutRect>& focusRingRects) const;
static void markRendererDirtyAfterTopLayerChange(RenderElement* renderer, RenderBlock* containingBlockBeforeStyleResolution);
void clearNeedsLayoutForSkippedContent();
void setRenderBoxHasShapeOutsideInfo(bool b) { m_renderBoxHasShapeOutsideInfo = b; }
void setHasCachedSVGResource(bool b) { m_hasCachedSVGResource = b; }
bool renderBoxHasShapeOutsideInfo() const { return m_renderBoxHasShapeOutsideInfo; }
bool hasCachedSVGResource() const { return m_hasCachedSVGResource; }
virtual bool overflowChangesMayAffectLayout() const { return false; }
protected:
RenderElement(Type, Element&, RenderStyle&&, OptionSet<TypeFlag>, TypeSpecificFlags);
RenderElement(Type, Document&, RenderStyle&&, OptionSet<TypeFlag>, TypeSpecificFlags);
bool layerCreationAllowedForSubtree() const;
enum class StylePropagationType {
AllChildren,
BlockAndRubyChildren
};
void propagateStyleToAnonymousChildren(StylePropagationType);
bool repaintBeforeStyleChange(StyleDifference, const RenderStyle& oldStyle, const RenderStyle& newStyle);
virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle);
virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
void insertedIntoTree() override;
void willBeRemovedFromTree() override;
void willBeDestroyed() override;
void notifyFinished(CachedResource&, const NetworkLoadMetrics&, LoadWillContinueInAnotherProcess) override;
void setHasContinuationChainNode(bool b) { m_hasContinuationChainNode = b; }
void setRenderBlockHasMarginBeforeQuirk(bool b) { m_renderBlockHasMarginBeforeQuirk = b; }
void setRenderBlockHasMarginAfterQuirk(bool b) { m_renderBlockHasMarginAfterQuirk = b; }
void setRenderBlockShouldForceRelayoutChildren(bool b) { m_renderBlockShouldForceRelayoutChildren = b; }
void setRenderBlockHasRareData(bool b) { m_renderBlockHasRareData = b; }
bool renderBlockHasMarginBeforeQuirk() const { return m_renderBlockHasMarginBeforeQuirk; }
bool renderBlockHasMarginAfterQuirk() const { return m_renderBlockHasMarginAfterQuirk; }
bool renderBlockShouldForceRelayoutChildren() const { return m_renderBlockShouldForceRelayoutChildren; }
bool renderBlockHasRareData() const { return m_renderBlockHasRareData; }
void setRenderBlockFlowLineLayoutPath(unsigned u) { m_renderBlockFlowLineLayoutPath = u; }
unsigned renderBlockFlowLineLayoutPath() const { return m_renderBlockFlowLineLayoutPath; }
void paintOutline(PaintInfo&, const LayoutRect&);
void updateOutlineAutoAncestor(bool hasOutlineAuto);
void removeFromRenderFragmentedFlowIncludingDescendants(bool shouldUpdateState);
void adjustFragmentedFlowStateOnContainingBlockChangeIfNeeded(const RenderStyle& oldStyle, const RenderStyle& newStyle);
bool isVisibleInViewport() const;
bool shouldApplyLayoutOrPaintContainment(bool) const;
inline bool shouldApplySizeOrStyleContainment(bool) const;
const Element* defaultAnchor() const;
const RenderElement* defaultAnchorRenderer() const;
private:
RenderElement(Type, ContainerNode&, RenderStyle&&, OptionSet<TypeFlag>, TypeSpecificFlags);
void node() const = delete;
void nonPseudoNode() const = delete;
void generatingNode() const = delete;
void isRenderText() const = delete;
void isRenderElement() const = delete;
RenderObject* firstChildSlow() const final { return firstChild(); }
RenderObject* lastChildSlow() const final { return lastChild(); }
RenderElement* rendererForPseudoStyleAcrossShadowBoundary() const;
// Called when an object that was floating or positioned becomes a normal flow object
// again. We have to make sure the render tree updates as needed to accommodate the new
// normal flow object.
void handleDynamicFloatPositionChange();
bool shouldRepaintForStyleDifference(StyleDifference) const;
void updateFillImages(const FillLayer*, const FillLayer*);
void updateImage(StyleImage*, StyleImage*);
void updateShapeImage(const ShapeValue*, const ShapeValue*);
StyleDifference adjustStyleDifference(StyleDifference, OptionSet<StyleDifferenceContextSensitiveProperty>) const;
bool canDestroyDecodedData() const final { return !isVisibleInViewport(); }
VisibleInViewportState imageFrameAvailable(CachedImage&, ImageAnimatingState, const IntRect* changeRect) final;
VisibleInViewportState imageVisibleInViewport(const Document&) const final;
void didRemoveCachedImageClient(CachedImage&) final;
void scheduleRenderingUpdateForImage(CachedImage&) final;
bool getLeadingCorner(FloatPoint& output, bool& insideFixed) const;
bool getTrailingCorner(FloatPoint& output, bool& insideFixed) const;
void clearSubtreeLayoutRootIfNeeded() const;
bool shouldWillChangeCreateStackingContext() const;
void issueRepaintForOutlineAuto(float outlineSize);
void updateReferencedSVGResources();
void clearReferencedSVGResources();
const RenderStyle* textSegmentPseudoStyle(PseudoId) const;
SingleThreadPackedWeakPtr<RenderObject> m_firstChild;
unsigned m_hasInitializedStyle : 1;
unsigned m_hasPausedImageAnimations : 1;
unsigned m_hasCounterNodeMap : 1;
unsigned m_hasContinuationChainNode : 1;
unsigned m_isContinuation : 1;
unsigned m_isFirstLetter : 1;
unsigned m_renderBlockHasMarginBeforeQuirk : 1;
unsigned m_renderBlockHasMarginAfterQuirk : 1;
unsigned m_renderBlockShouldForceRelayoutChildren : 1;
unsigned m_renderBlockHasRareData : 1 { false };
unsigned m_renderBoxHasShapeOutsideInfo : 1 { false };
unsigned m_hasCachedSVGResource : 1 { false };
unsigned m_renderBlockFlowLineLayoutPath : 3;
SingleThreadPackedWeakPtr<RenderObject> m_lastChild;
unsigned m_isRegisteredForVisibleInViewportCallback : 1;
unsigned m_visibleInViewportState : 2;
unsigned m_didContributeToVisuallyNonEmptyPixelCount : 1;
RenderStyle m_style;
};
inline int adjustForAbsoluteZoom(int, const RenderElement&);
inline LayoutUnit adjustLayoutUnitForAbsoluteZoom(LayoutUnit, const RenderElement&);
inline LayoutSize adjustLayoutSizeForAbsoluteZoom(LayoutSize, const RenderElement&);
inline bool isSkippedContentRoot(const RenderElement&);
inline void RenderElement::setChildNeedsLayout(MarkingBehavior markParents)
{
ASSERT(!isSetNeedsLayoutForbidden());
if (normalChildNeedsLayout())
return;
setNormalChildNeedsLayoutBit(true);
if (markParents == MarkContainingBlockChain)
scheduleLayout(markContainingBlocksForLayout());
}
inline Element* RenderElement::generatingElement() const
{
return downcast<Element>(RenderObject::generatingNode());
}
inline bool RenderElement::canEstablishContainingBlockWithTransform() const
{
return isRenderBlock() || (isTablePart() && !isRenderTableCol());
}
inline const RenderStyle& RenderObject::style() const
{
if (isRenderText())
return m_parent->style();
return downcast<RenderElement>(*this).style();
}
inline const RenderStyle& RenderObject::firstLineStyle() const
{
if (isRenderText())
return m_parent->firstLineStyle();
return downcast<RenderElement>(*this).firstLineStyle();
}
inline RenderElement* ContainerNode::renderer() const
{
return downcast<RenderElement>(Node::renderer());
}
inline CheckedPtr<RenderElement> ContainerNode::checkedRenderer() const
{
return renderer();
}
inline RenderObject* RenderElement::firstInFlowChild() const
{
if (auto* firstChild = this->firstChild()) {
if (firstChild->isInFlow())
return firstChild;
return firstChild->nextInFlowSibling();
}
return nullptr;
}
inline RenderObject* RenderElement::lastInFlowChild() const
{
if (auto* lastChild = this->lastChild()) {
if (lastChild->isInFlow())
return lastChild;
return lastChild->previousInFlowSibling();
}
return nullptr;
}
inline RenderElement* RenderObject::parent() const
{
return m_parent.get();
}
inline CheckedPtr<RenderElement> RenderObject::checkedParent() const
{
return m_parent.get();
}
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderElement, isRenderElement())
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