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* Copyright (C) 1999 Lars Knoll (
* (C) 1999 Antti Koivisto (
* (C) 2007 David Smith (
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 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
* 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.
#ifndef RenderBlock_h
#define RenderBlock_h
#include "core/rendering/ColumnInfo.h"
#include "core/rendering/FloatingObjects.h"
#include "core/rendering/GapRects.h"
#include "core/rendering/RenderBox.h"
#include "core/rendering/RenderLineBoxList.h"
#include "core/rendering/RootInlineBox.h"
#include "core/rendering/style/ShapeValue.h"
#include "platform/text/TextBreakIterator.h"
#include "platform/text/TextRun.h"
#include "wtf/ListHashSet.h"
#include "wtf/OwnPtr.h"
namespace blink {
class LineInfo;
class LineLayoutState;
struct PaintInfo;
class RenderInline;
class RenderRubyRun;
class RenderText;
class WordMeasurement;
template <class Run> class BidiRunList;
typedef WTF::ListHashSet<RenderBox*, 16> TrackedRendererListHashSet;
typedef WTF::HashMap<const RenderBlock*, OwnPtr<TrackedRendererListHashSet> > TrackedDescendantsMap;
typedef WTF::HashMap<const RenderBox*, OwnPtr<HashSet<RenderBlock*> > > TrackedContainerMap;
typedef Vector<WordMeasurement, 64> WordMeasurements;
enum ContainingBlockState { NewContainingBlock, SameContainingBlock };
typedef WTF::HashMap<RenderBlock*, OwnPtr<ListHashSet<RenderInline*> > > ContinuationOutlineTableMap;
ContinuationOutlineTableMap* continuationOutlineTable();
class RenderBlock : public RenderBox {
virtual void destroy() override;
virtual void trace(Visitor*) override;
friend class LineLayoutState;
explicit RenderBlock(ContainerNode*);
virtual ~RenderBlock();
RenderObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
RenderObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }
// If you have a RenderBlock, use firstChild or lastChild instead.
void slowFirstChild() const WTF_DELETED_FUNCTION;
void slowLastChild() const WTF_DELETED_FUNCTION;
const RenderObjectChildList* children() const { return &m_children; }
RenderObjectChildList* children() { return &m_children; }
bool beingDestroyed() const { return m_beingDestroyed; }
// These two functions are overridden for inline-block.
virtual LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override final;
virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
LayoutUnit minLineHeightForReplacedRenderer(bool isFirstLine, LayoutUnit replacedHeight) const;
RenderLineBoxList* lineBoxes() { return &m_lineBoxes; }
InlineFlowBox* firstLineBox() const { return m_lineBoxes.firstLineBox(); }
InlineFlowBox* lastLineBox() const { return m_lineBoxes.lastLineBox(); }
RootInlineBox* firstRootBox() const { return static_cast<RootInlineBox*>(firstLineBox()); }
RootInlineBox* lastRootBox() const { return static_cast<RootInlineBox*>(lastLineBox()); }
// FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
virtual void deleteLineBoxTree();
virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) override;
virtual void removeChild(RenderObject*) override;
virtual void layoutBlock(bool relayoutChildren);
void insertPositionedObject(RenderBox*);
static void removePositionedObject(RenderBox*);
void removePositionedObjects(RenderBlock*, ContainingBlockState = SameContainingBlock);
TrackedRendererListHashSet* positionedObjects() const;
bool hasPositionedObjects() const
TrackedRendererListHashSet* objects = positionedObjects();
return objects && !objects->isEmpty();
void addPercentHeightDescendant(RenderBox*);
static void removePercentHeightDescendant(RenderBox*);
static bool hasPercentHeightContainerMap();
static bool hasPercentHeightDescendant(RenderBox*);
static void clearPercentHeightDescendantsFrom(RenderBox*);
static void removePercentHeightDescendantIfNeeded(RenderBox*);
TrackedRendererListHashSet* percentHeightDescendants() const;
bool hasPercentHeightDescendants() const
TrackedRendererListHashSet* descendants = percentHeightDescendants();
return descendants && !descendants->isEmpty();
void setHasMarkupTruncation(bool b) { m_hasMarkupTruncation = b; }
bool hasMarkupTruncation() const { return m_hasMarkupTruncation; }
void setHasMarginBeforeQuirk(bool b) { m_hasMarginBeforeQuirk = b; }
void setHasMarginAfterQuirk(bool b) { m_hasMarginAfterQuirk = b; }
bool hasMarginBeforeQuirk() const { return m_hasMarginBeforeQuirk; }
bool hasMarginAfterQuirk() const { return m_hasMarginAfterQuirk; }
bool hasMarginBeforeQuirk(const RenderBox* child) const;
bool hasMarginAfterQuirk(const RenderBox* child) const;
void markPositionedObjectsForLayout();
// FIXME: Do we really need this to be virtual? It's just so we can call this on
// RenderBoxes without needed to check whether they're RenderBlocks first.
virtual void markForPaginationRelayoutIfNeeded(SubtreeLayoutScope&) override final;
LayoutUnit textIndentOffset() const;
virtual PositionWithAffinity positionForPoint(const LayoutPoint&) override;
// Block flows subclass availableWidth to handle multi column layout (shrinking the width available to children when laying out.)
virtual LayoutUnit availableLogicalWidth() const override final;
LayoutPoint flipForWritingModeIncludingColumns(const LayoutPoint&) const;
void adjustStartEdgeForWritingModeIncludingColumns(LayoutRect&) const;
LayoutUnit blockDirectionOffset(const LayoutSize& offsetFromBlock) const;
LayoutUnit inlineDirectionOffset(const LayoutSize& offsetFromBlock) const;
virtual bool shouldPaintSelectionGaps() const override final;
GapRects selectionGapRectsForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer) const;
LayoutRect logicalLeftSelectionGap(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
const RenderObject* selObj, LayoutUnit logicalLeft, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo*) const;
LayoutRect logicalRightSelectionGap(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
const RenderObject* selObj, LayoutUnit logicalRight, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo*) const;
void getSelectionGapInfo(SelectionState, bool& leftGap, bool& rightGap) const;
RenderBlock* blockBeforeWithinSelectionRoot(LayoutSize& offset) const;
virtual void setSelectionState(SelectionState) override;
LayoutRect logicalRectToPhysicalRect(const LayoutPoint& physicalPosition, const LayoutRect& logicalRect) const;
// Helper methods for computing line counts and heights for line counts.
RootInlineBox* lineAtIndex(int) const;
int lineCount(const RootInlineBox* = 0, bool* = 0) const;
int heightForLineCount(int);
void clearTruncation();
void adjustRectForColumns(LayoutRect&) const;
virtual LayoutSize columnOffset(const LayoutPoint&) const override;
void adjustForColumnRect(LayoutSize& offset, const LayoutPoint& locationInContainer) const;
void addContinuationWithOutline(RenderInline*);
virtual RenderBoxModelObject* virtualContinuation() const override final { return continuation(); }
bool isAnonymousBlockContinuation() const { return continuation() && isAnonymousBlock(); }
RenderInline* inlineElementContinuation() const;
RenderBlock* blockElementContinuation() const;
using RenderBoxModelObject::continuation;
using RenderBoxModelObject::setContinuation;
static RenderBlock* createAnonymousWithParentRendererAndDisplay(const RenderObject*, EDisplay = BLOCK);
static RenderBlockFlow* createAnonymousColumnsWithParentRenderer(const RenderObject*);
static RenderBlockFlow* createAnonymousColumnSpanWithParentRenderer(const RenderObject*);
RenderBlock* createAnonymousBlock(EDisplay display = BLOCK) const { return createAnonymousWithParentRendererAndDisplay(this, display); }
RenderBlockFlow* createAnonymousColumnsBlock() const { return createAnonymousColumnsWithParentRenderer(this); }
RenderBlockFlow* createAnonymousColumnSpanBlock() const { return createAnonymousColumnSpanWithParentRenderer(this); }
virtual RenderBox* createAnonymousBoxWithSameTypeAs(const RenderObject* parent) const override;
ColumnInfo* columnInfo() const;
int columnGap() const;
// These two functions take the ColumnInfo* to avoid repeated lookups of the info in the global HashMap.
unsigned columnCount(ColumnInfo*) const;
LayoutRect columnRectAt(ColumnInfo*, unsigned) const;
// The page logical offset is the object's offset from the top of the page in the page progression
// direction (so an x-offset in vertical text and a y-offset for horizontal text).
LayoutUnit pageLogicalOffset() const { return m_pageLogicalOffset; }
void setPageLogicalOffset(LayoutUnit offset) { m_pageLogicalOffset = offset; }
// Accessors for logical width/height and margins in the containing block's block-flow direction.
LayoutUnit logicalWidthForChild(const RenderBox* child) const { return isHorizontalWritingMode() ? child->width() : child->height(); }
LayoutUnit logicalHeightForChild(const RenderBox* child) const { return isHorizontalWritingMode() ? child->height() : child->width(); }
LayoutSize logicalSizeForChild(const RenderBox* child) const { return isHorizontalWritingMode() ? child->size() : child->size().transposedSize(); }
LayoutUnit logicalTopForChild(const RenderBox* child) const { return isHorizontalWritingMode() ? child->y() : child->x(); }
LayoutUnit marginBeforeForChild(const RenderBoxModelObject* child) const { return child->marginBefore(style()); }
LayoutUnit marginAfterForChild(const RenderBoxModelObject* child) const { return child->marginAfter(style()); }
LayoutUnit marginStartForChild(const RenderBoxModelObject* child) const { return child->marginStart(style()); }
LayoutUnit marginEndForChild(const RenderBoxModelObject* child) const { return child->marginEnd(style()); }
void setMarginStartForChild(RenderBox* child, LayoutUnit value) const { child->setMarginStart(value, style()); }
void setMarginEndForChild(RenderBox* child, LayoutUnit value) const { child->setMarginEnd(value, style()); }
void setMarginBeforeForChild(RenderBox* child, LayoutUnit value) const { child->setMarginBefore(value, style()); }
void setMarginAfterForChild(RenderBox* child, LayoutUnit value) const { child->setMarginAfter(value, style()); }
LayoutUnit collapsedMarginBeforeForChild(const RenderBox* child) const;
LayoutUnit collapsedMarginAfterForChild(const RenderBox* child) const;
virtual void updateFirstLetter();
virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) override;
virtual void scrollbarsChanged(bool /*horizontalScrollbarChanged*/, bool /*verticalScrollbarChanged*/) { }
LayoutUnit availableLogicalWidthForContent() const { return max<LayoutUnit>(0, logicalRightOffsetForContent() - logicalLeftOffsetForContent()); }
LayoutUnit logicalLeftOffsetForContent() const { return isHorizontalWritingMode() ? borderLeft() + paddingLeft() : borderTop() + paddingTop(); }
LayoutUnit logicalRightOffsetForContent() const { return logicalLeftOffsetForContent() + availableLogicalWidth(); }
LayoutUnit startOffsetForContent() const { return style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }
LayoutUnit endOffsetForContent() const { return !style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }
virtual LayoutUnit logicalLeftSelectionOffset(const RenderBlock* rootBlock, LayoutUnit position) const;
virtual LayoutUnit logicalRightSelectionOffset(const RenderBlock* rootBlock, LayoutUnit position) const;
GapRects selectionGaps(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo* = 0) const;
void checkPositionedObjectsNeedLayout();
bool paintsContinuationOutline(RenderInline* flow);
#ifndef NDEBUG
void showLineTreeAndMark(const InlineBox* = 0, const char* = 0, const InlineBox* = 0, const char* = 0, const RenderObject* = 0) const;
bool recalcChildOverflowAfterStyleChange();
bool recalcOverflowAfterStyleChange();
virtual void willBeDestroyed() override;
void dirtyForLayoutFromPercentageHeightDescendants(SubtreeLayoutScope&);
virtual void layout() override;
virtual bool updateImageLoadingPriorities() override final;
enum PositionedLayoutBehavior {
void layoutPositionedObjects(bool relayoutChildren, PositionedLayoutBehavior = DefaultLayout);
void markFixedPositionObjectForLayoutIfNeeded(RenderObject* child, SubtreeLayoutScope&);
LayoutUnit marginIntrinsicLogicalWidthForChild(RenderBox* child) const;
int beforeMarginInLineDirection(LineDirectionMode) const;
virtual void paint(PaintInfo&, const LayoutPoint&) override;
virtual void paintObject(PaintInfo&, const LayoutPoint&) override;
virtual void paintChildren(PaintInfo&, const LayoutPoint&);
// FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
virtual void paintFloats(PaintInfo&, const LayoutPoint&, bool) { }
virtual void adjustInlineDirectionLineBounds(unsigned /* expansionOpportunityCount */, float& /* logicalLeft */, float& /* logicalWidth */) const { }
virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
virtual void computePreferredLogicalWidths() override;
void adjustIntrinsicLogicalWidthsForColumns(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const;
virtual int firstLineBoxBaseline() const override;
virtual int inlineBlockBaseline(LineDirectionMode) const override;
int lastLineBoxBaseline(LineDirectionMode) const;
virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&) override;
// Delay update scrollbar until finishDelayUpdateScrollInfo() will be
// called. This function is used when a flexbox is laying out its
// descendant. If multiple calls are made to startDelayUpdateScrollInfo(),
// finishDelayUpdateScrollInfo() will do nothing until finishDelayUpdateScrollInfo()
// is called the same number of times.
static void startDelayUpdateScrollInfo();
static void finishDelayUpdateScrollInfo();
void updateScrollInfoAfterLayout();
virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) override;
virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
virtual bool hasLineIfEmpty() const;
bool simplifiedLayout();
virtual void simplifiedNormalFlowLayout();
void setDesiredColumnCountAndWidth(int, LayoutUnit);
virtual void computeOverflow(LayoutUnit oldClientAfterEdge, bool = false);
virtual void addOverflowFromChildren();
void addOverflowFromPositionedObjects();
void addOverflowFromBlockChildren();
void addVisualOverflowFromTheme();
virtual void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer) const override;
virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const override;
void updateBlockChildDirtyBitsBeforeLayout(bool relayoutChildren, RenderBox*);
virtual bool isInlineBlockOrInlineTable() const override final { return isInline() && isReplaced(); }
virtual void invalidatePaintOfSubtreesIfNeeded(const PaintInvalidationState& childPaintInvalidationState) override;
virtual RenderObjectChildList* virtualChildren() override final { return children(); }
virtual const RenderObjectChildList* virtualChildren() const override final { return children(); }
virtual const char* renderName() const override;
virtual bool isRenderBlock() const override final { return true; }
void makeChildrenNonInline(RenderObject* insertionPoint = 0);
virtual void removeLeftoverAnonymousBlock(RenderBlock* child);
static void collapseAnonymousBlockChild(RenderBlock* parent, RenderBlock* child);
virtual void dirtyLinesFromChangedChild(RenderObject* child) override final { m_lineBoxes.dirtyLinesFromChangedChild(this, child); }
void addChildToContinuation(RenderObject* newChild, RenderObject* beforeChild);
virtual void addChildIgnoringContinuation(RenderObject* newChild, RenderObject* beforeChild) override;
void addChildToAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild);
void addChildIgnoringAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild = 0);
virtual bool isSelfCollapsingBlock() const override;
void insertIntoTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*&, TrackedContainerMap*&);
static void removeFromTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*&, TrackedContainerMap*&);
void createFirstLetterRenderer(RenderObject* firstLetterBlock, RenderText& currentChild, unsigned length);
void updateFirstLetterStyle(RenderObject* firstLetterBlock, RenderObject* firstLetterContainer);
bool isInvalidFirstLetterRenderer(RenderObject*) const;
Node* nodeForHitTest() const;
virtual bool avoidsFloats() const override { return true; }
bool hitTestColumns(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);
bool hitTestContents(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);
// FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
virtual bool hitTestFloats(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&) { return false; }
virtual bool isPointInOverflowControl(HitTestResult&, const LayoutPoint& locationInContainer, const LayoutPoint& accumulatedOffset);
void computeBlockPreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const;
// Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline
// children.
virtual RenderBlock* firstLineBlock() const override;
virtual LayoutRect rectWithOutlineForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, LayoutUnit outlineWidth, const PaintInvalidationState* = 0) const override final;
virtual RenderObject* hoverAncestor() const override final;
virtual void updateDragState(bool dragOn) override final;
virtual void childBecameNonInline(RenderObject* child) override final;
virtual LayoutRect selectionRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer) const override final
return selectionGapRectsForPaintInvalidation(paintInvalidationContainer);
bool isSelectionRoot() const;
GapRects blockSelectionGaps(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo*) const;
LayoutRect blockSelectionGap(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
LayoutUnit lastLogicalTop, LayoutUnit lastLogicalLeft, LayoutUnit lastLogicalRight, LayoutUnit logicalBottom, const PaintInfo*) const;
// FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
virtual void clipOutFloatingObjects(const RenderBlock*, const PaintInfo*, const LayoutPoint&, const LayoutSize&) const { };
virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const override;
virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const override;
LayoutUnit desiredColumnWidth() const;
virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0) override final;
void adjustPointToColumnContents(LayoutPoint&) const;
void markLinesDirtyInBlockRange(LayoutUnit logicalTop, LayoutUnit logicalBottom, RootInlineBox* highest = 0);
Position positionForBox(InlineBox*, bool start = true) const;
PositionWithAffinity positionForPointWithInlineChildren(const LayoutPoint&);
void calcColumnWidth();
void makeChildrenAnonymousColumnBlocks(RenderObject* beforeChild, RenderBlockFlow* newBlockBox, RenderObject* newChild);
void splitBlocks(RenderBlock* fromBlock, RenderBlock* toBlock, RenderBlock* middleBlock,
RenderObject* beforeChild, RenderBoxModelObject* oldCont);
void splitFlow(RenderObject* beforeChild, RenderBlock* newBlockBox,
RenderObject* newChild, RenderBoxModelObject* oldCont);
RenderBlock* clone() const;
RenderBlock* continuationBefore(RenderObject* beforeChild);
RenderBlockFlow* containingColumnsBlock(bool allowAnonymousColumnBlock = true);
RenderBlockFlow* columnsBlockForSpanningElement(RenderObject* newChild);
// End helper functions and structs used by layoutBlockChildren.
void removeFromGlobalMaps();
bool widthAvailableToChildrenHasChanged();
// Returns the logicalOffset at the top of the next page. If the offset passed in is already at the top of the current page,
// then nextPageLogicalTop with ExcludePageBoundary will still move to the top of the next page. nextPageLogicalTop with
// IncludePageBoundary set will not.
// For a page height of 800px, the first rule will return 800 if the value passed in is 0. The second rule will simply return 0.
enum PageBoundaryRule { ExcludePageBoundary, IncludePageBoundary };
LayoutUnit nextPageLogicalTop(LayoutUnit logicalOffset, PageBoundaryRule = ExcludePageBoundary) const;
bool createsBlockFormattingContext() const;
LayoutUnit pageLogicalHeightForOffset(LayoutUnit offset) const;
LayoutUnit pageRemainingLogicalHeightForOffset(LayoutUnit offset, PageBoundaryRule = IncludePageBoundary) const;
// A page break is required at some offset due to space shortage in the current fragmentainer.
void setPageBreak(LayoutUnit offset, LayoutUnit spaceShortage);
// Update minimum page height required to avoid fragmentation where it shouldn't occur (inside
// unbreakable content, between orphans and widows, etc.). This will be used as a hint to the
// column balancer to help set a good minimum column height.
void updateMinimumPageHeight(LayoutUnit offset, LayoutUnit minHeight);
// Adjust from painting offsets to the local coords of this renderer
void offsetForContents(LayoutPoint&) const;
bool requiresColumns(int desiredColumnCount) const;
virtual bool updateLogicalWidthAndColumnWidth();
virtual bool canCollapseAnonymousBlockChild() const { return true; }
virtual LayoutUnit offsetFromLogicalTopOfFirstPage() const override final;
RenderObjectChildList m_children;
RenderLineBoxList m_lineBoxes; // All of the root line boxes created for this block flow. For example, <div>Hello<br>world.</div> will have two total lines for the <div>.
LayoutUnit m_pageLogicalOffset;
unsigned m_hasMarginBeforeQuirk : 1; // Note these quirk values can't be put in RenderBlockRareData since they are set too frequently.
unsigned m_hasMarginAfterQuirk : 1;
unsigned m_beingDestroyed : 1;
unsigned m_hasMarkupTruncation : 1;
unsigned m_hasBorderOrPaddingLogicalWidthChanged : 1;
mutable unsigned m_hasOnlySelfCollapsingChildren : 1;
mutable unsigned m_descendantsWithFloatsMarkedForLayout : 1;
// RenderRubyBase objects need to be able to split and merge, moving their children around
// (calling moveChildTo, moveAllChildrenTo, and makeChildrenNonInline).
friend class RenderRubyBase;
// FIXME-BLOCKFLOW: Remove this when the line layout stuff has all moved out of RenderBlock
friend class LineBreaker;
// FIXME: This is temporary as we move code that accesses block flow
// member variables out of RenderBlock and into RenderBlockFlow.
friend class RenderBlockFlow;
DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlock, isRenderBlock());
} // namespace blink
#endif // RenderBlock_h