| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * Copyright (C) 2003, 2006, 2007, 2015 Apple 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 "FrameView.h" |
| #include "RenderBoxModelObject.h" |
| #include "RenderOverflow.h" |
| #include "ScrollTypes.h" |
| #include "ShapeOutsideInfo.h" |
| |
| namespace WebCore { |
| |
| class InlineElementBox; |
| class RenderBlockFlow; |
| class RenderBoxFragmentInfo; |
| class RenderFragmentContainer; |
| struct PaintInfo; |
| |
| enum SizeType { MainOrPreferredSize, MinSize, MaxSize }; |
| enum AvailableLogicalHeightType { ExcludeMarginBorderPadding, IncludeMarginBorderPadding }; |
| enum OverlayScrollbarSizeRelevancy { IgnoreOverlayScrollbarSize, IncludeOverlayScrollbarSize }; |
| |
| enum ShouldComputePreferred { ComputeActual, ComputePreferred }; |
| |
| class RenderBox : public RenderBoxModelObject { |
| WTF_MAKE_ISO_ALLOCATED(RenderBox); |
| public: |
| virtual ~RenderBox(); |
| |
| // hasAutoZIndex only returns true if the element is positioned or a flex-item since |
| // position:static elements that are not flex-items get their z-index coerced to auto. |
| bool requiresLayer() const override |
| { |
| return isDocumentElementRenderer() || isPositioned() || createsGroup() || hasClipPath() || hasOverflowClip() |
| || hasTransformRelatedProperty() || hasHiddenBackface() || hasReflection() || style().specifiesColumns() |
| || !style().hasAutoZIndex() || hasRunningAcceleratedAnimations(); |
| } |
| |
| bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const final; |
| |
| // Returns false for the body renderer if its background is propagated to the root. |
| bool paintsOwnBackground() const; |
| |
| LayoutUnit x() const { return m_frameRect.x(); } |
| LayoutUnit y() const { return m_frameRect.y(); } |
| LayoutUnit width() const { return m_frameRect.width(); } |
| LayoutUnit height() const { return m_frameRect.height(); } |
| |
| // These represent your location relative to your container as a physical offset. |
| // In layout related methods you almost always want the logical location (e.g. x() and y()). |
| LayoutUnit top() const { return topLeftLocation().y(); } |
| LayoutUnit left() const { return topLeftLocation().x(); } |
| |
| template<typename T> void setX(T x) { m_frameRect.setX(x); } |
| template<typename T> void setY(T y) { m_frameRect.setY(y); } |
| template<typename T> void setWidth(T width) { m_frameRect.setWidth(width); } |
| template<typename T> void setHeight(T height) { m_frameRect.setHeight(height); } |
| |
| LayoutUnit logicalLeft() const { return style().isHorizontalWritingMode() ? x() : y(); } |
| LayoutUnit logicalRight() const { return logicalLeft() + logicalWidth(); } |
| LayoutUnit logicalTop() const { return style().isHorizontalWritingMode() ? y() : x(); } |
| LayoutUnit logicalBottom() const { return logicalTop() + logicalHeight(); } |
| LayoutUnit logicalWidth() const { return style().isHorizontalWritingMode() ? width() : height(); } |
| LayoutUnit logicalHeight() const { return style().isHorizontalWritingMode() ? height() : width(); } |
| |
| LayoutUnit constrainLogicalWidthInFragmentByMinMax(LayoutUnit, LayoutUnit, RenderBlock&, RenderFragmentContainer* = nullptr) const; |
| LayoutUnit constrainLogicalHeightByMinMax(LayoutUnit logicalHeight, Optional<LayoutUnit> intrinsicContentHeight) const; |
| LayoutUnit constrainContentBoxLogicalHeightByMinMax(LayoutUnit logicalHeight, Optional<LayoutUnit> intrinsicContentHeight) const; |
| |
| void setLogicalLeft(LayoutUnit left) |
| { |
| if (style().isHorizontalWritingMode()) |
| setX(left); |
| else |
| setY(left); |
| } |
| void setLogicalTop(LayoutUnit top) |
| { |
| if (style().isHorizontalWritingMode()) |
| setY(top); |
| else |
| setX(top); |
| } |
| void setLogicalLocation(const LayoutPoint& location) |
| { |
| if (style().isHorizontalWritingMode()) |
| setLocation(location); |
| else |
| setLocation(location.transposedPoint()); |
| } |
| void setLogicalWidth(LayoutUnit size) |
| { |
| if (style().isHorizontalWritingMode()) |
| setWidth(size); |
| else |
| setHeight(size); |
| } |
| void setLogicalHeight(LayoutUnit size) |
| { |
| if (style().isHorizontalWritingMode()) |
| setHeight(size); |
| else |
| setWidth(size); |
| } |
| void setLogicalSize(const LayoutSize& size) |
| { |
| if (style().isHorizontalWritingMode()) |
| setSize(size); |
| else |
| setSize(size.transposedSize()); |
| } |
| |
| LayoutPoint location() const { return m_frameRect.location(); } |
| LayoutSize locationOffset() const { return LayoutSize(x(), y()); } |
| LayoutSize size() const { return m_frameRect.size(); } |
| |
| void setLocation(const LayoutPoint& location) { m_frameRect.setLocation(location); } |
| |
| void setSize(const LayoutSize& size) { m_frameRect.setSize(size); } |
| void move(LayoutUnit dx, LayoutUnit dy) { m_frameRect.move(dx, dy); } |
| |
| LayoutRect frameRect() const { return m_frameRect; } |
| void setFrameRect(const LayoutRect& rect) { m_frameRect = rect; } |
| |
| LayoutRect marginBoxRect() const |
| { |
| auto marginLeft = computedCSSPadding(style().marginLeft()); |
| auto marginRight = computedCSSPadding(style().marginRight()); |
| auto marginTop = computedCSSPadding(style().marginTop()); |
| auto marginBottom = computedCSSPadding(style().marginBottom()); |
| return LayoutRect(-marginLeft, -marginTop, size().width() + marginLeft + marginRight, size().height() + marginTop + marginBottom); |
| } |
| LayoutRect borderBoxRect() const { return LayoutRect(LayoutPoint(), size()); } |
| LayoutRect borderBoundingBox() const final { return borderBoxRect(); } |
| |
| WEBCORE_EXPORT RoundedRect::Radii borderRadii() const; |
| |
| // The content area of the box (excludes padding - and intrinsic padding for table cells, etc... - and border). |
| LayoutRect contentBoxRect() const; |
| LayoutPoint contentBoxLocation() const; |
| |
| // The content box in absolute coords. Ignores transforms. |
| IntRect absoluteContentBox() const; |
| // The content box converted to absolute coords (taking transforms into account). |
| WEBCORE_EXPORT FloatQuad absoluteContentQuad() const; |
| |
| // This returns the content area of the box (excluding padding and border). The only difference with contentBoxRect is that computedCSSContentBoxRect |
| // does include the intrinsic padding in the content box as this is what some callers expect (like getComputedStyle). |
| LayoutRect computedCSSContentBoxRect() const { return LayoutRect(borderLeft() + computedCSSPaddingLeft(), borderTop() + computedCSSPaddingTop(), paddingBoxWidth() - computedCSSPaddingLeft() - computedCSSPaddingRight(), paddingBoxHeight() - computedCSSPaddingTop() - computedCSSPaddingBottom()); } |
| |
| // Bounds of the outline box in absolute coords. Respects transforms |
| LayoutRect outlineBoundsForRepaint(const RenderLayerModelObject* /*repaintContainer*/, const RenderGeometryMap*) const final; |
| void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer = nullptr) override; |
| |
| FloatRect repaintRectInLocalCoordinates() const override { return borderBoxRect(); } |
| FloatRect objectBoundingBox() const override { return borderBoxRect(); } |
| |
| // Note these functions are not equivalent of childrenOfType<RenderBox> |
| RenderBox* parentBox() const; |
| RenderBox* firstChildBox() const; |
| RenderBox* lastChildBox() const; |
| RenderBox* previousSiblingBox() const; |
| RenderBox* nextSiblingBox() const; |
| |
| // Visual and layout overflow are in the coordinate space of the box. This means that they aren't purely physical directions. |
| // For horizontal-tb and vertical-lr they will match physical directions, but for horizontal-bt and vertical-rl, the top/bottom and left/right |
| // respectively are flipped when compared to their physical counterparts. For example minX is on the left in vertical-lr, |
| // but it is on the right in vertical-rl. |
| WEBCORE_EXPORT LayoutRect flippedClientBoxRect() const; |
| LayoutRect layoutOverflowRect() const { return m_overflow ? m_overflow->layoutOverflowRect() : flippedClientBoxRect(); } |
| LayoutUnit logicalLeftLayoutOverflow() const { return style().isHorizontalWritingMode() ? layoutOverflowRect().x() : layoutOverflowRect().y(); } |
| LayoutUnit logicalRightLayoutOverflow() const { return style().isHorizontalWritingMode() ? layoutOverflowRect().maxX() : layoutOverflowRect().maxY(); } |
| |
| LayoutRect visualOverflowRect() const { return m_overflow ? m_overflow->visualOverflowRect() : borderBoxRect(); } |
| LayoutUnit logicalLeftVisualOverflow() const { return style().isHorizontalWritingMode() ? visualOverflowRect().x() : visualOverflowRect().y(); } |
| LayoutUnit logicalRightVisualOverflow() const { return style().isHorizontalWritingMode() ? visualOverflowRect().maxX() : visualOverflowRect().maxY(); } |
| |
| LayoutRect overflowRectForPaintRejection() const; |
| |
| void addLayoutOverflow(const LayoutRect&); |
| void addVisualOverflow(const LayoutRect&); |
| void clearOverflow(); |
| |
| virtual bool isTopLayoutOverflowAllowed() const { return !style().isLeftToRightDirection() && !isHorizontalWritingMode(); } |
| virtual bool isLeftLayoutOverflowAllowed() const { return !style().isLeftToRightDirection() && isHorizontalWritingMode(); } |
| |
| void addVisualEffectOverflow(); |
| LayoutRect applyVisualEffectOverflow(const LayoutRect&) const; |
| void addOverflowFromChild(const RenderBox* child) { addOverflowFromChild(child, child->locationOffset()); } |
| void addOverflowFromChild(const RenderBox* child, const LayoutSize& delta); |
| |
| void updateLayerTransform(); |
| |
| LayoutSize contentSize() const { return { contentWidth(), contentHeight() }; } |
| LayoutUnit contentWidth() const { return paddingBoxWidth() - paddingLeft() - paddingRight(); } |
| LayoutUnit contentHeight() const { return paddingBoxHeight() - paddingTop() - paddingBottom(); } |
| LayoutUnit contentLogicalWidth() const { return style().isHorizontalWritingMode() ? contentWidth() : contentHeight(); } |
| LayoutUnit contentLogicalHeight() const { return style().isHorizontalWritingMode() ? contentHeight() : contentWidth(); } |
| |
| LayoutUnit paddingBoxWidth() const { return width() - borderLeft() - borderRight() - verticalScrollbarWidth(); } |
| LayoutUnit paddingBoxHeight() const { return height() - borderTop() - borderBottom() - horizontalScrollbarHeight(); } |
| LayoutRect paddingBoxRect() const; |
| LayoutRect paddingBoxRectIncludingScrollbar() const { return LayoutRect(borderLeft(), borderTop(), width() - borderLeft() - borderRight(), height() - borderTop() - borderBottom()); } |
| |
| // IE extensions. Used to calculate offsetWidth/Height. Overridden by inlines (RenderFlow) |
| // to return the remaining width on a given line (and the height of a single line). |
| LayoutUnit offsetWidth() const override { return width(); } |
| LayoutUnit offsetHeight() const override { return height(); } |
| |
| // More IE extensions. clientWidth and clientHeight represent the interior of an object |
| // excluding border and scrollbar. clientLeft/Top are just the borderLeftWidth and borderTopWidth. |
| LayoutUnit clientLeft() const { return borderLeft(); } |
| LayoutUnit clientTop() const { return borderTop(); } |
| WEBCORE_EXPORT LayoutUnit clientWidth() const; |
| WEBCORE_EXPORT LayoutUnit clientHeight() const; |
| LayoutUnit clientLogicalWidth() const { return style().isHorizontalWritingMode() ? clientWidth() : clientHeight(); } |
| LayoutUnit clientLogicalHeight() const { return style().isHorizontalWritingMode() ? clientHeight() : clientWidth(); } |
| LayoutUnit clientLogicalBottom() const { return borderBefore() + clientLogicalHeight(); } |
| LayoutRect clientBoxRect() const { return LayoutRect(clientLeft(), clientTop(), clientWidth(), clientHeight()); } |
| |
| // scrollWidth/scrollHeight will be the same as clientWidth/clientHeight unless the |
| // object has overflow:hidden/scroll/auto specified and also has overflow. |
| // scrollLeft/Top return the current scroll position. These methods are virtual so that objects like |
| // textareas can scroll shadow content (but pretend that they are the objects that are |
| // scrolling). |
| virtual int scrollLeft() const; |
| virtual int scrollTop() const; |
| virtual int scrollWidth() const; |
| virtual int scrollHeight() const; |
| virtual void setScrollLeft(int, ScrollType, ScrollClamping = ScrollClamping::Clamped); |
| virtual void setScrollTop(int, ScrollType, ScrollClamping = ScrollClamping::Clamped); |
| |
| LayoutUnit marginTop() const override { return m_marginBox.top(); } |
| LayoutUnit marginBottom() const override { return m_marginBox.bottom(); } |
| LayoutUnit marginLeft() const override { return m_marginBox.left(); } |
| LayoutUnit marginRight() const override { return m_marginBox.right(); } |
| void setMarginTop(LayoutUnit margin) { m_marginBox.setTop(margin); } |
| void setMarginBottom(LayoutUnit margin) { m_marginBox.setBottom(margin); } |
| void setMarginLeft(LayoutUnit margin) { m_marginBox.setLeft(margin); } |
| void setMarginRight(LayoutUnit margin) { m_marginBox.setRight(margin); } |
| |
| LayoutUnit marginLogicalLeft() const { return m_marginBox.start(style().writingMode()); } |
| LayoutUnit marginLogicalRight() const { return m_marginBox.end(style().writingMode()); } |
| |
| LayoutUnit marginBefore(const RenderStyle* overrideStyle = nullptr) const final { return m_marginBox.before((overrideStyle ? overrideStyle : &style())->writingMode()); } |
| LayoutUnit marginAfter(const RenderStyle* overrideStyle = nullptr) const final { return m_marginBox.after((overrideStyle ? overrideStyle : &style())->writingMode()); } |
| LayoutUnit marginStart(const RenderStyle* overrideStyle = nullptr) const final |
| { |
| const RenderStyle* styleToUse = overrideStyle ? overrideStyle : &style(); |
| return m_marginBox.start(styleToUse->writingMode(), styleToUse->direction()); |
| } |
| LayoutUnit marginEnd(const RenderStyle* overrideStyle = nullptr) const final |
| { |
| const RenderStyle* styleToUse = overrideStyle ? overrideStyle : &style(); |
| return m_marginBox.end(styleToUse->writingMode(), styleToUse->direction()); |
| } |
| void setMarginBefore(LayoutUnit value, const RenderStyle* overrideStyle = nullptr) { m_marginBox.setBefore(value, (overrideStyle ? overrideStyle : &style())->writingMode()); } |
| void setMarginAfter(LayoutUnit value, const RenderStyle* overrideStyle = nullptr) { m_marginBox.setAfter(value, (overrideStyle ? overrideStyle : &style())->writingMode()); } |
| void setMarginStart(LayoutUnit value, const RenderStyle* overrideStyle = nullptr) |
| { |
| const RenderStyle* styleToUse = overrideStyle ? overrideStyle : &style(); |
| m_marginBox.setStart(value, styleToUse->writingMode(), styleToUse->direction()); |
| } |
| void setMarginEnd(LayoutUnit value, const RenderStyle* overrideStyle = nullptr) |
| { |
| const RenderStyle* styleToUse = overrideStyle ? overrideStyle : &style(); |
| m_marginBox.setEnd(value, styleToUse->writingMode(), styleToUse->direction()); |
| } |
| |
| virtual bool isSelfCollapsingBlock() const { return false; } |
| virtual LayoutUnit collapsedMarginBefore() const { return marginBefore(); } |
| virtual LayoutUnit collapsedMarginAfter() const { return marginAfter(); } |
| |
| void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const override; |
| void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const override; |
| |
| int reflectionOffset() const; |
| // Given a rect in the object's coordinate space, returns the corresponding rect in the reflection. |
| LayoutRect reflectedRect(const LayoutRect&) const; |
| |
| void layout() override; |
| bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) override; |
| |
| LayoutUnit minPreferredLogicalWidth() const override; |
| LayoutUnit maxPreferredLogicalWidth() const override; |
| |
| // FIXME: We should rename these back to overrideLogicalHeight/Width and have them store |
| // the border-box height/width like the regular height/width accessors on RenderBox. |
| // Right now, these are different than contentHeight/contentWidth because they still |
| // include the scrollbar height/width. |
| LayoutUnit overrideContentLogicalWidth() const; |
| LayoutUnit overrideContentLogicalHeight() const; |
| bool hasOverrideContentLogicalHeight() const; |
| bool hasOverrideContentLogicalWidth() const; |
| void setOverrideContentLogicalHeight(LayoutUnit); |
| void setOverrideContentLogicalWidth(LayoutUnit); |
| void clearOverrideContentSize(); |
| void clearOverrideContentLogicalHeight(); |
| void clearOverrideContentLogicalWidth(); |
| |
| Optional<LayoutUnit> overrideContainingBlockContentWidth() const override; |
| Optional<LayoutUnit> overrideContainingBlockContentHeight() const override; |
| bool hasOverrideContainingBlockContentWidth() const override; |
| bool hasOverrideContainingBlockContentHeight() const override; |
| Optional<LayoutUnit> overrideContainingBlockContentLogicalWidth() const; |
| Optional<LayoutUnit> overrideContainingBlockContentLogicalHeight() const; |
| bool hasOverrideContainingBlockContentLogicalWidth() const; |
| bool hasOverrideContainingBlockContentLogicalHeight() const; |
| void setOverrideContainingBlockContentLogicalWidth(Optional<LayoutUnit>); |
| void setOverrideContainingBlockContentLogicalHeight(Optional<LayoutUnit>); |
| void clearOverrideContainingBlockContentSize(); |
| void clearOverrideContainingBlockContentLogicalHeight(); |
| |
| LayoutSize offsetFromContainer(RenderElement&, const LayoutPoint&, bool* offsetDependsOnPoint = nullptr) const override; |
| |
| LayoutUnit adjustBorderBoxLogicalWidthForBoxSizing(LayoutUnit width) const; |
| LayoutUnit adjustContentBoxLogicalWidthForBoxSizing(LayoutUnit width) const; |
| |
| template<typename T> LayoutUnit adjustBorderBoxLogicalWidthForBoxSizing(T width) const { return adjustBorderBoxLogicalWidthForBoxSizing(LayoutUnit(width)); } |
| template<typename T> LayoutUnit adjustContentBoxLogicalWidthForBoxSizing(T width) const { return adjustContentBoxLogicalWidthForBoxSizing(LayoutUnit(width)); } |
| |
| // Overridden by fieldsets to subtract out the intrinsic border. |
| virtual LayoutUnit adjustBorderBoxLogicalHeightForBoxSizing(LayoutUnit height) const; |
| virtual LayoutUnit adjustContentBoxLogicalHeightForBoxSizing(Optional<LayoutUnit> height) const; |
| |
| struct ComputedMarginValues { |
| LayoutUnit m_before; |
| LayoutUnit m_after; |
| LayoutUnit m_start; |
| LayoutUnit m_end; |
| }; |
| struct LogicalExtentComputedValues { |
| LayoutUnit m_extent; |
| LayoutUnit m_position; |
| ComputedMarginValues m_margins; |
| }; |
| // Resolve auto margins in the inline direction of the containing block so that objects can be pushed to the start, middle or end |
| // of the containing block. |
| void computeInlineDirectionMargins(const RenderBlock& containingBlock, LayoutUnit containerWidth, LayoutUnit childWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const; |
| |
| // Used to resolve margins in the containing block's block-flow direction. |
| void computeBlockDirectionMargins(const RenderBlock& containingBlock, LayoutUnit& marginBefore, LayoutUnit& marginAfter) const; |
| void computeAndSetBlockDirectionMargins(const RenderBlock& containingBlock); |
| |
| enum RenderBoxFragmentInfoFlags { CacheRenderBoxFragmentInfo, DoNotCacheRenderBoxFragmentInfo }; |
| LayoutRect borderBoxRectInFragment(RenderFragmentContainer*, RenderBoxFragmentInfoFlags = CacheRenderBoxFragmentInfo) const; |
| LayoutRect clientBoxRectInFragment(RenderFragmentContainer*) const; |
| RenderFragmentContainer* clampToStartAndEndFragments(RenderFragmentContainer*) const; |
| bool hasFragmentRangeInFragmentedFlow() const; |
| virtual LayoutUnit offsetFromLogicalTopOfFirstPage() const; |
| |
| void positionLineBox(InlineElementBox&); |
| |
| virtual std::unique_ptr<InlineElementBox> createInlineBox(); |
| void dirtyLineBoxes(bool fullLayout); |
| |
| // For inline replaced elements, this function returns the inline box that owns us. Enables |
| // the replaced RenderObject to quickly determine what line it is contained on and to easily |
| // iterate over structures on the line. |
| InlineElementBox* inlineBoxWrapper() const { return m_inlineBoxWrapper; } |
| void setInlineBoxWrapper(InlineElementBox*); |
| void deleteLineBoxWrapper(); |
| |
| LayoutRect clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const override; |
| Optional<LayoutRect> computeVisibleRectInContainer(const LayoutRect&, const RenderLayerModelObject* container, VisibleRectContext) const |
| override; |
| void repaintDuringLayoutIfMoved(const LayoutRect&); |
| virtual void repaintOverhangingFloats(bool paintAllDescendants); |
| |
| LayoutUnit containingBlockLogicalWidthForContent() const override; |
| LayoutUnit containingBlockLogicalHeightForContent(AvailableLogicalHeightType) const; |
| LayoutUnit containingBlockLogicalWidthForPositioned(const RenderBoxModelObject& containingBlock, RenderFragmentContainer* = nullptr, bool checkForPerpendicularWritingMode = true) const; |
| LayoutUnit containingBlockLogicalHeightForPositioned(const RenderBoxModelObject& containingBlock, bool checkForPerpendicularWritingMode = true) const; |
| LayoutUnit containingBlockLogicalWidthForContentInFragment(RenderFragmentContainer*) const; |
| LayoutUnit containingBlockAvailableLineWidthInFragment(RenderFragmentContainer*) const; |
| LayoutUnit perpendicularContainingBlockLogicalHeight() const; |
| |
| virtual void updateLogicalWidth(); |
| virtual void updateLogicalHeight(); |
| virtual LogicalExtentComputedValues computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop) const; |
| |
| void cacheIntrinsicContentLogicalHeightForFlexItem(LayoutUnit) const; |
| |
| // This function will compute the logical border-box height, without laying |
| // out the box. This means that the result is only "correct" when the height |
| // is explicitly specified. This function exists so that intrinsic width |
| // calculations have a way to deal with children that have orthogonal writing modes. |
| // When there is no explicit height, this function assumes a content height of |
| // zero (and returns just border + padding). |
| LayoutUnit computeLogicalHeightWithoutLayout() const; |
| |
| RenderBoxFragmentInfo* renderBoxFragmentInfo(RenderFragmentContainer*, RenderBoxFragmentInfoFlags = CacheRenderBoxFragmentInfo) const; |
| void computeLogicalWidthInFragment(LogicalExtentComputedValues&, RenderFragmentContainer* = nullptr) const; |
| |
| bool stretchesToViewport() const |
| { |
| return document().inQuirksMode() && style().logicalHeight().isAuto() && !isFloatingOrOutOfFlowPositioned() && (isDocumentElementRenderer() || isBody()) && !isInline(); |
| } |
| |
| virtual LayoutSize intrinsicSize() const { return LayoutSize(); } |
| LayoutUnit intrinsicLogicalWidth() const { return style().isHorizontalWritingMode() ? intrinsicSize().width() : intrinsicSize().height(); } |
| LayoutUnit intrinsicLogicalHeight() const { return style().isHorizontalWritingMode() ? intrinsicSize().height() : intrinsicSize().width(); } |
| |
| // Whether or not the element shrinks to its intrinsic width (rather than filling the width |
| // of a containing block). HTML4 buttons, <select>s, <input>s, legends, and floating/compact elements do this. |
| bool sizesLogicalWidthToFitContent(SizeType) const; |
| |
| bool hasStretchedLogicalWidth() const; |
| bool isStretchingColumnFlexItem() const; |
| bool columnFlexItemHasStretchAlignment() const; |
| |
| LayoutUnit shrinkLogicalWidthToAvoidFloats(LayoutUnit childMarginStart, LayoutUnit childMarginEnd, const RenderBlock& cb, RenderFragmentContainer*) const; |
| |
| LayoutUnit computeLogicalWidthInFragmentUsing(SizeType, Length logicalWidth, LayoutUnit availableLogicalWidth, const RenderBlock& containingBlock, RenderFragmentContainer*) const; |
| Optional<LayoutUnit> computeLogicalHeightUsing(SizeType, const Length& height, Optional<LayoutUnit> intrinsicContentHeight) const; |
| Optional<LayoutUnit> computeContentLogicalHeight(SizeType, const Length& height, Optional<LayoutUnit> intrinsicContentHeight) const; |
| Optional<LayoutUnit> computeContentAndScrollbarLogicalHeightUsing(SizeType, const Length& height, Optional<LayoutUnit> intrinsicContentHeight) const; |
| LayoutUnit computeReplacedLogicalWidthUsing(SizeType, Length width) const; |
| LayoutUnit computeReplacedLogicalWidthRespectingMinMaxWidth(LayoutUnit logicalWidth, ShouldComputePreferred = ComputeActual) const; |
| LayoutUnit computeReplacedLogicalHeightUsing(SizeType, Length height) const; |
| LayoutUnit computeReplacedLogicalHeightRespectingMinMaxHeight(LayoutUnit logicalHeight) const; |
| |
| template<typename T> LayoutUnit computeReplacedLogicalWidthRespectingMinMaxWidth(T logicalWidth, ShouldComputePreferred shouldComputePreferred = ComputeActual) const { return computeReplacedLogicalWidthRespectingMinMaxWidth(LayoutUnit(logicalWidth), shouldComputePreferred); } |
| template<typename T> LayoutUnit computeReplacedLogicalHeightRespectingMinMaxHeight(T logicalHeight) const { return computeReplacedLogicalHeightRespectingMinMaxHeight(LayoutUnit(logicalHeight)); } |
| |
| virtual LayoutUnit computeReplacedLogicalWidth(ShouldComputePreferred = ComputeActual) const; |
| virtual LayoutUnit computeReplacedLogicalHeight(Optional<LayoutUnit> estimatedUsedWidth = WTF::nullopt) const; |
| |
| Optional<LayoutUnit> computePercentageLogicalHeight(const Length& height) const; |
| |
| virtual LayoutUnit availableLogicalWidth() const { return contentLogicalWidth(); } |
| virtual LayoutUnit availableLogicalHeight(AvailableLogicalHeightType) const; |
| LayoutUnit availableLogicalHeightUsing(const Length&, AvailableLogicalHeightType) const; |
| |
| // There are a few cases where we need to refer specifically to the available physical width and available physical height. |
| // Relative positioning is one of those cases, since left/top offsets are physical. |
| LayoutUnit availableWidth() const { return style().isHorizontalWritingMode() ? availableLogicalWidth() : availableLogicalHeight(IncludeMarginBorderPadding); } |
| LayoutUnit availableHeight() const { return style().isHorizontalWritingMode() ? availableLogicalHeight(IncludeMarginBorderPadding) : availableLogicalWidth(); } |
| |
| WEBCORE_EXPORT virtual int verticalScrollbarWidth() const; |
| WEBCORE_EXPORT int horizontalScrollbarHeight() const; |
| int intrinsicScrollbarLogicalWidth() const; |
| int scrollbarLogicalWidth() const { return style().isHorizontalWritingMode() ? verticalScrollbarWidth() : horizontalScrollbarHeight(); } |
| int scrollbarLogicalHeight() const { return style().isHorizontalWritingMode() ? horizontalScrollbarHeight() : verticalScrollbarWidth(); } |
| virtual bool scroll(ScrollDirection, ScrollGranularity, float multiplier = 1, Element** stopElement = nullptr, RenderBox* startBox = nullptr, const IntPoint& wheelEventAbsolutePoint = IntPoint()); |
| virtual bool logicalScroll(ScrollLogicalDirection, ScrollGranularity, float multiplier = 1, Element** stopElement = nullptr); |
| WEBCORE_EXPORT bool canBeScrolledAndHasScrollableArea() const; |
| virtual bool canBeProgramaticallyScrolled() const; |
| virtual void autoscroll(const IntPoint&); |
| bool canAutoscroll() const; |
| IntSize calculateAutoscrollDirection(const IntPoint& windowPoint) const; |
| static RenderBox* findAutoscrollable(RenderObject*); |
| virtual void stopAutoscroll() { } |
| virtual void panScroll(const IntPoint&); |
| |
| bool hasVerticalScrollbarWithAutoBehavior() const; |
| bool hasHorizontalScrollbarWithAutoBehavior() const; |
| |
| bool canUseOverlayScrollbars() const; |
| |
| bool scrollsOverflow() const { return scrollsOverflowX() || scrollsOverflowY(); } |
| bool scrollsOverflowX() const { return hasOverflowClip() && (style().overflowX() == Overflow::Scroll || style().overflowX() == Overflow::Auto); } |
| bool scrollsOverflowY() const { return hasOverflowClip() && (style().overflowY() == Overflow::Scroll || style().overflowY() == Overflow::Auto); } |
| |
| bool hasHorizontalOverflow() const { return scrollWidth() != roundToInt(paddingBoxWidth()); } |
| bool hasVerticalOverflow() const { return scrollHeight() != roundToInt(paddingBoxHeight()); } |
| |
| bool hasScrollableOverflowX() const { return scrollsOverflowX() && hasHorizontalOverflow(); } |
| bool hasScrollableOverflowY() const { return scrollsOverflowY() && hasVerticalOverflow(); } |
| |
| bool usesCompositedScrolling() const; |
| |
| bool percentageLogicalHeightIsResolvable() const; |
| bool hasUnsplittableScrollingOverflow() const; |
| bool isUnsplittableForPagination() const; |
| |
| bool shouldTreatChildAsReplacedInTableCells() const; |
| |
| LayoutRect localCaretRect(InlineBox*, unsigned caretOffset, LayoutUnit* extraWidthToEndOfLine = nullptr) override; |
| |
| virtual LayoutRect overflowClipRect(const LayoutPoint& location, RenderFragmentContainer* = nullptr, OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize, PaintPhase = PaintPhase::BlockBackground); |
| virtual LayoutRect overflowClipRectForChildLayers(const LayoutPoint& location, RenderFragmentContainer* fragment, OverlayScrollbarSizeRelevancy relevancy) { return overflowClipRect(location, fragment, relevancy); } |
| LayoutRect clipRect(const LayoutPoint& location, RenderFragmentContainer*); |
| virtual bool hasControlClip() const { return false; } |
| virtual LayoutRect controlClipRect(const LayoutPoint&) const { return LayoutRect(); } |
| bool pushContentsClip(PaintInfo&, const LayoutPoint& accumulatedOffset); |
| void popContentsClip(PaintInfo&, PaintPhase originalPhase, const LayoutPoint& accumulatedOffset); |
| |
| virtual void paintObject(PaintInfo&, const LayoutPoint&) { ASSERT_NOT_REACHED(); } |
| virtual void paintBoxDecorations(PaintInfo&, const LayoutPoint&); |
| virtual void paintMask(PaintInfo&, const LayoutPoint&); |
| virtual void paintClippingMask(PaintInfo&, const LayoutPoint&); |
| void imageChanged(WrappedImagePtr, const IntRect* = nullptr) override; |
| |
| // Called when a positioned object moves but doesn't necessarily change size. A simplified layout is attempted |
| // that just updates the object's position. If the size does change, the object remains dirty. |
| bool tryLayoutDoingPositionedMovementOnly() |
| { |
| LayoutUnit oldWidth = width(); |
| updateLogicalWidth(); |
| // If we shrink to fit our width may have changed, so we still need full layout. |
| if (oldWidth != width()) |
| return false; |
| updateLogicalHeight(); |
| return true; |
| } |
| |
| LayoutRect maskClipRect(const LayoutPoint& paintOffset); |
| |
| VisiblePosition positionForPoint(const LayoutPoint&, const RenderFragmentContainer*) override; |
| |
| void removeFloatingOrPositionedChildFromBlockLists(); |
| |
| RenderLayer* enclosingFloatPaintingLayer() const; |
| |
| virtual Optional<int> firstLineBaseline() const { return Optional<int>(); } |
| virtual Optional<int> inlineBlockBaseline(LineDirectionMode) const { return Optional<int>(); } // Returns empty if we should skip this box when computing the baseline of an inline-block. |
| |
| bool shrinkToAvoidFloats() const; |
| virtual bool avoidsFloats() const; |
| |
| virtual void markForPaginationRelayoutIfNeeded() { } |
| |
| bool isWritingModeRoot() const { return !parent() || parent()->style().writingMode() != style().writingMode(); } |
| |
| bool isDeprecatedFlexItem() const { return !isInline() && !isFloatingOrOutOfFlowPositioned() && parent() && parent()->isDeprecatedFlexibleBox(); } |
| bool isFlexItemIncludingDeprecated() const { return !isInline() && !isFloatingOrOutOfFlowPositioned() && parent() && parent()->isFlexibleBoxIncludingDeprecated(); } |
| |
| LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override; |
| int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override; |
| |
| LayoutUnit offsetLeft() const override; |
| LayoutUnit offsetTop() const override; |
| |
| LayoutPoint flipForWritingModeForChild(const RenderBox* child, const LayoutPoint&) const; |
| LayoutUnit flipForWritingMode(LayoutUnit position) const; // The offset is in the block direction (y for horizontal writing modes, x for vertical writing modes). |
| LayoutPoint flipForWritingMode(const LayoutPoint&) const; |
| LayoutSize flipForWritingMode(const LayoutSize&) const; |
| void flipForWritingMode(LayoutRect&) const; |
| FloatPoint flipForWritingMode(const FloatPoint&) const; |
| void flipForWritingMode(FloatRect&) const; |
| // These represent your location relative to your container as a physical offset. |
| // In layout related methods you almost always want the logical location (e.g. x() and y()). |
| LayoutPoint topLeftLocation() const; |
| LayoutSize topLeftLocationOffset() const; |
| void applyTopLeftLocationOffset(LayoutPoint& point) const |
| { |
| // This is inlined for speed, since it is used by updateLayerPosition() during scrolling. |
| if (!document().view()->hasFlippedBlockRenderers()) |
| point.move(m_frameRect.x(), m_frameRect.y()); |
| else |
| applyTopLeftLocationOffsetWithFlipping(point); |
| } |
| |
| LayoutRect logicalVisualOverflowRectForPropagation(const RenderStyle*) const; |
| LayoutRect visualOverflowRectForPropagation(const RenderStyle*) const; |
| LayoutRect logicalLayoutOverflowRectForPropagation(const RenderStyle*) const; |
| LayoutRect layoutOverflowRectForPropagation(const RenderStyle*) const; |
| |
| bool hasRenderOverflow() const { return m_overflow; } |
| bool hasVisualOverflow() const { return m_overflow && !borderBoxRect().contains(m_overflow->visualOverflowRect()); } |
| |
| virtual bool needsPreferredWidthsRecalculation() const; |
| virtual void computeIntrinsicRatioInformation(FloatSize& /* intrinsicSize */, double& /* intrinsicRatio */) const { } |
| |
| ScrollPosition scrollPosition() const; |
| LayoutSize cachedSizeForOverflowClip() const; |
| |
| // Returns false if the rect has no intersection with the applied clip rect. When the context specifies edge-inclusive |
| // intersection, this return value allows distinguishing between no intersection and zero-area intersection. |
| bool applyCachedClipAndScrollPosition(LayoutRect&, const RenderLayerModelObject* container, VisibleRectContext) const; |
| |
| virtual bool hasRelativeDimensions() const; |
| virtual bool hasRelativeLogicalHeight() const; |
| virtual bool hasRelativeLogicalWidth() const; |
| |
| bool hasHorizontalLayoutOverflow() const |
| { |
| if (!m_overflow) |
| return false; |
| |
| LayoutRect layoutOverflowRect = m_overflow->layoutOverflowRect(); |
| flipForWritingMode(layoutOverflowRect); |
| return layoutOverflowRect.x() < x() || layoutOverflowRect.maxX() > x() + logicalWidth(); |
| } |
| |
| bool hasVerticalLayoutOverflow() const |
| { |
| if (!m_overflow) |
| return false; |
| |
| LayoutRect layoutOverflowRect = m_overflow->layoutOverflowRect(); |
| flipForWritingMode(layoutOverflowRect); |
| return layoutOverflowRect.y() < y() || layoutOverflowRect.maxY() > y() + logicalHeight(); |
| } |
| |
| virtual RenderPtr<RenderBox> createAnonymousBoxWithSameTypeAs(const RenderBox&) const |
| { |
| ASSERT_NOT_REACHED(); |
| return nullptr; |
| } |
| |
| ShapeOutsideInfo* shapeOutsideInfo() const |
| { |
| return ShapeOutsideInfo::isEnabledFor(*this) ? ShapeOutsideInfo::info(*this) : nullptr; |
| } |
| |
| void markShapeOutsideDependentsForLayout() |
| { |
| if (isFloating()) |
| removeFloatingOrPositionedChildFromBlockLists(); |
| } |
| |
| // True if this box can have a range in an outside fragmentation context. |
| bool canHaveOutsideFragmentRange() const { return !isInFlowRenderFragmentedFlow(); } |
| virtual bool needsLayoutAfterFragmentRangeChange() const { return false; } |
| |
| const RenderBox* findEnclosingScrollableContainer() const; |
| |
| bool isGridItem() const { return parent() && parent()->isRenderGrid() && !isExcludedFromNormalLayout(); } |
| bool isFlexItem() const { return parent() && parent()->isFlexibleBox() && !isExcludedFromNormalLayout(); } |
| |
| virtual void adjustBorderBoxRectForPainting(LayoutRect&) { }; |
| |
| protected: |
| RenderBox(Element&, RenderStyle&&, BaseTypeFlags); |
| RenderBox(Document&, RenderStyle&&, BaseTypeFlags); |
| |
| void styleWillChange(StyleDifference, const RenderStyle& newStyle) override; |
| void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override; |
| void updateFromStyle() override; |
| |
| void willBeDestroyed() override; |
| |
| bool createsNewFormattingContext() const; |
| |
| virtual ItemPosition selfAlignmentNormalBehavior(const RenderBox* = nullptr) const { return ItemPosition::Stretch; } |
| |
| // Returns false if it could not cheaply compute the extent (e.g. fixed background), in which case the returned rect may be incorrect. |
| bool getBackgroundPaintedExtent(const LayoutPoint& paintOffset, LayoutRect&) const; |
| virtual bool foregroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect, unsigned maxDepthToTest) const; |
| bool computeBackgroundIsKnownToBeObscured(const LayoutPoint& paintOffset) override; |
| |
| void paintBackground(const PaintInfo&, const LayoutRect&, BackgroundBleedAvoidance = BackgroundBleedNone); |
| |
| void paintFillLayer(const PaintInfo&, const Color&, const FillLayer&, const LayoutRect&, BackgroundBleedAvoidance, CompositeOperator, RenderElement* backgroundObject, BaseBackgroundColorUsage = BaseBackgroundColorUse); |
| void paintFillLayers(const PaintInfo&, const Color&, const FillLayer&, const LayoutRect&, BackgroundBleedAvoidance = BackgroundBleedNone, CompositeOperator = CompositeSourceOver, RenderElement* backgroundObject = nullptr); |
| |
| void paintMaskImages(const PaintInfo&, const LayoutRect&); |
| |
| BackgroundBleedAvoidance determineBackgroundBleedAvoidance(GraphicsContext&) const; |
| bool backgroundHasOpaqueTopLayer() const; |
| |
| void computePositionedLogicalWidth(LogicalExtentComputedValues&, RenderFragmentContainer* = nullptr) const; |
| |
| LayoutUnit computeIntrinsicLogicalWidthUsing(Length logicalWidthLength, LayoutUnit availableLogicalWidth, LayoutUnit borderAndPadding) const; |
| virtual Optional<LayoutUnit> computeIntrinsicLogicalContentHeightUsing(Length logicalHeightLength, Optional<LayoutUnit> intrinsicContentHeight, LayoutUnit borderAndPadding) const; |
| |
| virtual bool shouldComputeSizeAsReplaced() const { return isReplaced() && !isInlineBlockOrInlineTable(); } |
| |
| void mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState&, MapCoordinatesFlags, bool* wasFixed) const override; |
| const RenderObject* pushMappingToContainer(const RenderLayerModelObject*, RenderGeometryMap&) const override; |
| void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const override; |
| |
| void paintRootBoxFillLayers(const PaintInfo&); |
| |
| bool skipContainingBlockForPercentHeightCalculation(const RenderBox& containingBlock, bool isPerpendicularWritingMode) const; |
| |
| private: |
| bool replacedMinMaxLogicalHeightComputesAsNone(SizeType) const; |
| |
| void updateShapeOutsideInfoAfterStyleChange(const RenderStyle&, const RenderStyle* oldStyle); |
| |
| void updateGridPositionAfterStyleChange(const RenderStyle&, const RenderStyle* oldStyle); |
| |
| bool scrollLayer(ScrollDirection, ScrollGranularity, float multiplier, Element** stopElement); |
| |
| bool fixedElementLaysOutRelativeToFrame(const FrameView&) const; |
| |
| bool includeVerticalScrollbarSize() const; |
| bool includeHorizontalScrollbarSize() const; |
| |
| bool isScrollableOrRubberbandableBox() const override; |
| |
| // Returns true if we did a full repaint. |
| bool repaintLayerRectsForImage(WrappedImagePtr, const FillLayer& layers, bool drawingBackground); |
| |
| void computePositionedLogicalHeight(LogicalExtentComputedValues&) const; |
| void computePositionedLogicalWidthUsing(SizeType, Length logicalWidth, const RenderBoxModelObject& containerBlock, TextDirection containerDirection, |
| LayoutUnit containerLogicalWidth, LayoutUnit bordersPlusPadding, |
| Length logicalLeft, Length logicalRight, Length marginLogicalLeft, Length marginLogicalRight, |
| LogicalExtentComputedValues&) const; |
| void computePositionedLogicalHeightUsing(SizeType, Length logicalHeightLength, const RenderBoxModelObject& containerBlock, |
| LayoutUnit containerLogicalHeight, LayoutUnit bordersPlusPadding, LayoutUnit logicalHeight, |
| Length logicalTop, Length logicalBottom, Length marginLogicalTop, Length marginLogicalBottom, |
| LogicalExtentComputedValues&) const; |
| |
| void computePositionedLogicalHeightReplaced(LogicalExtentComputedValues&) const; |
| void computePositionedLogicalWidthReplaced(LogicalExtentComputedValues&) const; |
| |
| LayoutUnit fillAvailableMeasure(LayoutUnit availableLogicalWidth) const; |
| LayoutUnit fillAvailableMeasure(LayoutUnit availableLogicalWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const; |
| |
| virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const; |
| |
| // This function calculates the minimum and maximum preferred widths for an object. |
| // These values are used in shrink-to-fit layout systems. |
| // These include tables, positioned objects, floats and flexible boxes. |
| virtual void computePreferredLogicalWidths() { setPreferredLogicalWidthsDirty(false); } |
| |
| LayoutRect frameRectForStickyPositioning() const final { return frameRect(); } |
| |
| LayoutRect computeVisibleRectUsingPaintOffset(const LayoutRect&) const; |
| |
| void applyTopLeftLocationOffsetWithFlipping(LayoutPoint&) const; |
| |
| private: |
| // The width/height of the contents + borders + padding. The x/y location is relative to our container (which is not always our parent). |
| LayoutRect m_frameRect; |
| |
| protected: |
| LayoutBoxExtent m_marginBox; |
| |
| // The preferred logical width of the element if it were to break its lines at every possible opportunity. |
| LayoutUnit m_minPreferredLogicalWidth; |
| |
| // The preferred logical width of the element if it never breaks any lines at all. |
| LayoutUnit m_maxPreferredLogicalWidth; |
| |
| // For inline replaced elements, the inline box that owns us. |
| InlineElementBox* m_inlineBoxWrapper { nullptr }; |
| |
| // Our overflow information. |
| RefPtr<RenderOverflow> m_overflow; |
| |
| private: |
| // Used to store state between styleWillChange and styleDidChange |
| static bool s_hadOverflowClip; |
| }; |
| |
| inline RenderBox* RenderBox::parentBox() const |
| { |
| if (is<RenderBox>(parent())) |
| return downcast<RenderBox>(parent()); |
| |
| ASSERT(!parent()); |
| return nullptr; |
| } |
| |
| inline RenderBox* RenderBox::firstChildBox() const |
| { |
| if (is<RenderBox>(firstChild())) |
| return downcast<RenderBox>(firstChild()); |
| |
| ASSERT(!firstChild()); |
| return nullptr; |
| } |
| |
| inline RenderBox* RenderBox::lastChildBox() const |
| { |
| if (is<RenderBox>(lastChild())) |
| return downcast<RenderBox>(lastChild()); |
| |
| ASSERT(!lastChild()); |
| return nullptr; |
| } |
| |
| inline RenderBox* RenderBox::previousSiblingBox() const |
| { |
| if (is<RenderBox>(previousSibling())) |
| return downcast<RenderBox>(previousSibling()); |
| |
| ASSERT(!previousSibling()); |
| return nullptr; |
| } |
| |
| inline RenderBox* RenderBox::nextSiblingBox() const |
| { |
| if (is<RenderBox>(nextSibling())) |
| return downcast<RenderBox>(nextSibling()); |
| |
| ASSERT(!nextSibling()); |
| return nullptr; |
| } |
| |
| inline void RenderBox::setInlineBoxWrapper(InlineElementBox* boxWrapper) |
| { |
| if (boxWrapper) { |
| ASSERT(!m_inlineBoxWrapper); |
| // m_inlineBoxWrapper should already be 0. Deleting it is a safeguard against security issues. |
| // Otherwise, there will two line box wrappers keeping the reference to this renderer, and |
| // only one will be notified when the renderer is getting destroyed. The second line box wrapper |
| // will keep a stale reference. |
| if (UNLIKELY(m_inlineBoxWrapper != nullptr)) |
| deleteLineBoxWrapper(); |
| } |
| |
| m_inlineBoxWrapper = boxWrapper; |
| } |
| |
| } // namespace WebCore |
| |
| SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderBox, isBox()) |
