2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 1999 Antti Koivisto (koivisto@kde.org)
4 * (C) 2007 David Smith (catfish.man@gmail.com)
5 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
26 #include "core/rendering/ColumnInfo.h"
27 #include "core/rendering/FloatingObjects.h"
28 #include "core/rendering/GapRects.h"
29 #include "core/rendering/RenderBox.h"
30 #include "core/rendering/RenderLineBoxList.h"
31 #include "core/rendering/RootInlineBox.h"
32 #include "core/rendering/style/ShapeValue.h"
33 #include "platform/text/TextBreakIterator.h"
34 #include "platform/text/TextRun.h"
35 #include "wtf/ListHashSet.h"
36 #include "wtf/OwnPtr.h"
41 class LineLayoutState;
46 class WordMeasurement;
48 template <class Run> class BidiRunList;
49 typedef WTF::ListHashSet<RenderBox*, 16> TrackedRendererListHashSet;
50 typedef WTF::HashMap<const RenderBlock*, OwnPtr<TrackedRendererListHashSet> > TrackedDescendantsMap;
51 typedef WTF::HashMap<const RenderBox*, OwnPtr<HashSet<RenderBlock*> > > TrackedContainerMap;
52 typedef Vector<WordMeasurement, 64> WordMeasurements;
54 enum ContainingBlockState { NewContainingBlock, SameContainingBlock };
56 typedef WTF::HashMap<RenderBlock*, OwnPtr<ListHashSet<RenderInline*> > > ContinuationOutlineTableMap;
58 ContinuationOutlineTableMap* continuationOutlineTable();
60 class RenderBlock : public RenderBox {
62 virtual void destroy() OVERRIDE;
63 virtual void trace(Visitor*) OVERRIDE;
64 friend class LineLayoutState;
67 explicit RenderBlock(ContainerNode*);
68 virtual ~RenderBlock();
71 RenderObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
72 RenderObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }
74 // If you have a RenderBlock, use firstChild or lastChild instead.
75 void slowFirstChild() const WTF_DELETED_FUNCTION;
76 void slowLastChild() const WTF_DELETED_FUNCTION;
78 const RenderObjectChildList* children() const { return &m_children; }
79 RenderObjectChildList* children() { return &m_children; }
81 bool beingDestroyed() const { return m_beingDestroyed; }
83 // These two functions are overridden for inline-block.
84 virtual LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const OVERRIDE FINAL;
85 virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const OVERRIDE;
87 LayoutUnit minLineHeightForReplacedRenderer(bool isFirstLine, LayoutUnit replacedHeight) const;
89 RenderLineBoxList* lineBoxes() { return &m_lineBoxes; }
92 InlineFlowBox* firstLineBox() const { return m_lineBoxes.firstLineBox(); }
93 InlineFlowBox* lastLineBox() const { return m_lineBoxes.lastLineBox(); }
95 RootInlineBox* firstRootBox() const { return static_cast<RootInlineBox*>(firstLineBox()); }
96 RootInlineBox* lastRootBox() const { return static_cast<RootInlineBox*>(lastLineBox()); }
99 // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
100 virtual void deleteLineBoxTree();
102 virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) OVERRIDE;
103 virtual void removeChild(RenderObject*) OVERRIDE;
105 virtual void layoutBlock(bool relayoutChildren);
107 void insertPositionedObject(RenderBox*);
108 static void removePositionedObject(RenderBox*);
109 void removePositionedObjects(RenderBlock*, ContainingBlockState = SameContainingBlock);
111 TrackedRendererListHashSet* positionedObjects() const;
112 bool hasPositionedObjects() const
114 TrackedRendererListHashSet* objects = positionedObjects();
115 return objects && !objects->isEmpty();
118 void addPercentHeightDescendant(RenderBox*);
119 static void removePercentHeightDescendant(RenderBox*);
120 static bool hasPercentHeightContainerMap();
121 static bool hasPercentHeightDescendant(RenderBox*);
122 static void clearPercentHeightDescendantsFrom(RenderBox*);
123 static void removePercentHeightDescendantIfNeeded(RenderBox*);
125 TrackedRendererListHashSet* percentHeightDescendants() const;
126 bool hasPercentHeightDescendants() const
128 TrackedRendererListHashSet* descendants = percentHeightDescendants();
129 return descendants && !descendants->isEmpty();
132 void setHasMarkupTruncation(bool b) { m_hasMarkupTruncation = b; }
133 bool hasMarkupTruncation() const { return m_hasMarkupTruncation; }
135 void setHasMarginBeforeQuirk(bool b) { m_hasMarginBeforeQuirk = b; }
136 void setHasMarginAfterQuirk(bool b) { m_hasMarginAfterQuirk = b; }
138 bool hasMarginBeforeQuirk() const { return m_hasMarginBeforeQuirk; }
139 bool hasMarginAfterQuirk() const { return m_hasMarginAfterQuirk; }
141 bool hasMarginBeforeQuirk(const RenderBox* child) const;
142 bool hasMarginAfterQuirk(const RenderBox* child) const;
144 void markPositionedObjectsForLayout();
145 // FIXME: Do we really need this to be virtual? It's just so we can call this on
146 // RenderBoxes without needed to check whether they're RenderBlocks first.
147 virtual void markForPaginationRelayoutIfNeeded(SubtreeLayoutScope&) OVERRIDE FINAL;
149 LayoutUnit textIndentOffset() const;
151 virtual PositionWithAffinity positionForPoint(const LayoutPoint&) OVERRIDE;
153 // Block flows subclass availableWidth to handle multi column layout (shrinking the width available to children when laying out.)
154 virtual LayoutUnit availableLogicalWidth() const OVERRIDE FINAL;
156 LayoutPoint flipForWritingModeIncludingColumns(const LayoutPoint&) const;
157 void adjustStartEdgeForWritingModeIncludingColumns(LayoutRect&) const;
159 LayoutUnit blockDirectionOffset(const LayoutSize& offsetFromBlock) const;
160 LayoutUnit inlineDirectionOffset(const LayoutSize& offsetFromBlock) const;
162 virtual bool shouldPaintSelectionGaps() const OVERRIDE FINAL;
163 GapRects selectionGapRectsForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer) const;
164 LayoutRect logicalLeftSelectionGap(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
165 const RenderObject* selObj, LayoutUnit logicalLeft, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo*) const;
166 LayoutRect logicalRightSelectionGap(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
167 const RenderObject* selObj, LayoutUnit logicalRight, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo*) const;
168 void getSelectionGapInfo(SelectionState, bool& leftGap, bool& rightGap) const;
169 RenderBlock* blockBeforeWithinSelectionRoot(LayoutSize& offset) const;
171 virtual void setSelectionState(SelectionState) OVERRIDE;
173 LayoutRect logicalRectToPhysicalRect(const LayoutPoint& physicalPosition, const LayoutRect& logicalRect) const;
175 // Helper methods for computing line counts and heights for line counts.
176 RootInlineBox* lineAtIndex(int) const;
177 int lineCount(const RootInlineBox* = 0, bool* = 0) const;
178 int heightForLineCount(int);
179 void clearTruncation();
181 void adjustRectForColumns(LayoutRect&) const;
182 virtual LayoutSize columnOffset(const LayoutPoint&) const OVERRIDE;
183 void adjustForColumnRect(LayoutSize& offset, const LayoutPoint& locationInContainer) const;
185 void addContinuationWithOutline(RenderInline*);
187 virtual RenderBoxModelObject* virtualContinuation() const OVERRIDE FINAL { return continuation(); }
188 bool isAnonymousBlockContinuation() const { return continuation() && isAnonymousBlock(); }
189 RenderInline* inlineElementContinuation() const;
190 RenderBlock* blockElementContinuation() const;
192 using RenderBoxModelObject::continuation;
193 using RenderBoxModelObject::setContinuation;
195 static RenderBlock* createAnonymousWithParentRendererAndDisplay(const RenderObject*, EDisplay = BLOCK);
196 static RenderBlockFlow* createAnonymousColumnsWithParentRenderer(const RenderObject*);
197 static RenderBlockFlow* createAnonymousColumnSpanWithParentRenderer(const RenderObject*);
198 RenderBlock* createAnonymousBlock(EDisplay display = BLOCK) const { return createAnonymousWithParentRendererAndDisplay(this, display); }
199 RenderBlockFlow* createAnonymousColumnsBlock() const { return createAnonymousColumnsWithParentRenderer(this); }
200 RenderBlockFlow* createAnonymousColumnSpanBlock() const { return createAnonymousColumnSpanWithParentRenderer(this); }
202 virtual RenderBox* createAnonymousBoxWithSameTypeAs(const RenderObject* parent) const OVERRIDE;
204 ColumnInfo* columnInfo() const;
205 int columnGap() const;
207 // These two functions take the ColumnInfo* to avoid repeated lookups of the info in the global HashMap.
208 unsigned columnCount(ColumnInfo*) const;
209 LayoutRect columnRectAt(ColumnInfo*, unsigned) const;
211 // The page logical offset is the object's offset from the top of the page in the page progression
212 // direction (so an x-offset in vertical text and a y-offset for horizontal text).
213 LayoutUnit pageLogicalOffset() const { return m_pageLogicalOffset; }
214 void setPageLogicalOffset(LayoutUnit offset) { m_pageLogicalOffset = offset; }
216 // Accessors for logical width/height and margins in the containing block's block-flow direction.
217 LayoutUnit logicalWidthForChild(const RenderBox* child) const { return isHorizontalWritingMode() ? child->width() : child->height(); }
218 LayoutUnit logicalHeightForChild(const RenderBox* child) const { return isHorizontalWritingMode() ? child->height() : child->width(); }
219 LayoutSize logicalSizeForChild(const RenderBox* child) const { return isHorizontalWritingMode() ? child->size() : child->size().transposedSize(); }
220 LayoutUnit logicalTopForChild(const RenderBox* child) const { return isHorizontalWritingMode() ? child->y() : child->x(); }
221 LayoutUnit marginBeforeForChild(const RenderBoxModelObject* child) const { return child->marginBefore(style()); }
222 LayoutUnit marginAfterForChild(const RenderBoxModelObject* child) const { return child->marginAfter(style()); }
223 LayoutUnit marginStartForChild(const RenderBoxModelObject* child) const { return child->marginStart(style()); }
224 LayoutUnit marginEndForChild(const RenderBoxModelObject* child) const { return child->marginEnd(style()); }
225 void setMarginStartForChild(RenderBox* child, LayoutUnit value) const { child->setMarginStart(value, style()); }
226 void setMarginEndForChild(RenderBox* child, LayoutUnit value) const { child->setMarginEnd(value, style()); }
227 void setMarginBeforeForChild(RenderBox* child, LayoutUnit value) const { child->setMarginBefore(value, style()); }
228 void setMarginAfterForChild(RenderBox* child, LayoutUnit value) const { child->setMarginAfter(value, style()); }
229 LayoutUnit collapsedMarginBeforeForChild(const RenderBox* child) const;
230 LayoutUnit collapsedMarginAfterForChild(const RenderBox* child) const;
232 virtual void updateFirstLetter();
233 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE;
235 virtual void scrollbarsChanged(bool /*horizontalScrollbarChanged*/, bool /*verticalScrollbarChanged*/) { }
237 LayoutUnit availableLogicalWidthForContent() const { return max<LayoutUnit>(0, logicalRightOffsetForContent() - logicalLeftOffsetForContent()); }
238 LayoutUnit logicalLeftOffsetForContent() const { return isHorizontalWritingMode() ? borderLeft() + paddingLeft() : borderTop() + paddingTop(); }
239 LayoutUnit logicalRightOffsetForContent() const { return logicalLeftOffsetForContent() + availableLogicalWidth(); }
240 LayoutUnit startOffsetForContent() const { return style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }
241 LayoutUnit endOffsetForContent() const { return !style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }
243 virtual LayoutUnit logicalLeftSelectionOffset(const RenderBlock* rootBlock, LayoutUnit position) const;
244 virtual LayoutUnit logicalRightSelectionOffset(const RenderBlock* rootBlock, LayoutUnit position) const;
246 GapRects selectionGaps(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
247 LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo* = 0) const;
250 void checkPositionedObjectsNeedLayout();
251 bool paintsContinuationOutline(RenderInline* flow);
254 void showLineTreeAndMark(const InlineBox* = 0, const char* = 0, const InlineBox* = 0, const char* = 0, const RenderObject* = 0) const;
257 bool recalcChildOverflowAfterStyleChange();
258 bool recalcOverflowAfterStyleChange();
261 virtual void willBeDestroyed() OVERRIDE;
263 void dirtyForLayoutFromPercentageHeightDescendants(SubtreeLayoutScope&);
265 virtual void layout() OVERRIDE;
266 virtual bool updateImageLoadingPriorities() OVERRIDE FINAL;
268 enum PositionedLayoutBehavior {
270 LayoutOnlyFixedPositionedObjects,
271 ForcedLayoutAfterContainingBlockMoved
274 void layoutPositionedObjects(bool relayoutChildren, PositionedLayoutBehavior = DefaultLayout);
275 void markFixedPositionObjectForLayoutIfNeeded(RenderObject* child, SubtreeLayoutScope&);
277 LayoutUnit marginIntrinsicLogicalWidthForChild(RenderBox* child) const;
279 int beforeMarginInLineDirection(LineDirectionMode) const;
281 virtual void paint(PaintInfo&, const LayoutPoint&) OVERRIDE;
283 virtual void paintObject(PaintInfo&, const LayoutPoint&) OVERRIDE;
284 virtual void paintChildren(PaintInfo&, const LayoutPoint&);
286 // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
287 virtual void paintFloats(PaintInfo&, const LayoutPoint&, bool) { }
290 virtual void adjustInlineDirectionLineBounds(unsigned /* expansionOpportunityCount */, float& /* logicalLeft */, float& /* logicalWidth */) const { }
292 virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE;
293 virtual void computePreferredLogicalWidths() OVERRIDE;
294 void adjustIntrinsicLogicalWidthsForColumns(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const;
296 virtual int firstLineBoxBaseline() const OVERRIDE;
297 virtual int inlineBlockBaseline(LineDirectionMode) const OVERRIDE;
298 int lastLineBoxBaseline(LineDirectionMode) const;
300 virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&) OVERRIDE;
302 // Delay update scrollbar until finishDelayUpdateScrollInfo() will be
303 // called. This function is used when a flexbox is laying out its
304 // descendant. If multiple calls are made to startDelayUpdateScrollInfo(),
305 // finishDelayUpdateScrollInfo() will do nothing until finishDelayUpdateScrollInfo()
306 // is called the same number of times.
307 static void startDelayUpdateScrollInfo();
308 static void finishDelayUpdateScrollInfo();
310 void updateScrollInfoAfterLayout();
312 virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) OVERRIDE;
313 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
315 virtual bool hasLineIfEmpty() const;
317 bool simplifiedLayout();
318 virtual void simplifiedNormalFlowLayout();
320 void setDesiredColumnCountAndWidth(int, LayoutUnit);
323 virtual void computeOverflow(LayoutUnit oldClientAfterEdge, bool = false);
325 virtual void addOverflowFromChildren();
326 void addOverflowFromPositionedObjects();
327 void addOverflowFromBlockChildren();
328 void addVisualOverflowFromTheme();
330 virtual void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer) const OVERRIDE;
332 virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const OVERRIDE;
334 void updateBlockChildDirtyBitsBeforeLayout(bool relayoutChildren, RenderBox*);
336 virtual bool isInlineBlockOrInlineTable() const OVERRIDE FINAL { return isInline() && isReplaced(); }
338 virtual void invalidateTreeIfNeeded(const PaintInvalidationState&) OVERRIDE;
341 virtual RenderObjectChildList* virtualChildren() OVERRIDE FINAL { return children(); }
342 virtual const RenderObjectChildList* virtualChildren() const OVERRIDE FINAL { return children(); }
344 virtual const char* renderName() const OVERRIDE;
346 virtual bool isRenderBlock() const OVERRIDE FINAL { return true; }
348 void makeChildrenNonInline(RenderObject* insertionPoint = 0);
349 virtual void removeLeftoverAnonymousBlock(RenderBlock* child);
351 static void collapseAnonymousBlockChild(RenderBlock* parent, RenderBlock* child);
353 virtual void dirtyLinesFromChangedChild(RenderObject* child) OVERRIDE FINAL { m_lineBoxes.dirtyLinesFromChangedChild(this, child); }
355 void addChildToContinuation(RenderObject* newChild, RenderObject* beforeChild);
356 virtual void addChildIgnoringContinuation(RenderObject* newChild, RenderObject* beforeChild) OVERRIDE;
357 void addChildToAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild);
359 void addChildIgnoringAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild = 0);
361 virtual bool isSelfCollapsingBlock() const OVERRIDE;
363 void insertIntoTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*&, TrackedContainerMap*&);
364 static void removeFromTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*&, TrackedContainerMap*&);
366 void createFirstLetterRenderer(RenderObject* firstLetterBlock, RenderText& currentChild, unsigned length);
367 void updateFirstLetterStyle(RenderObject* firstLetterBlock, RenderObject* firstLetterContainer);
369 Node* nodeForHitTest() const;
372 virtual bool avoidsFloats() const OVERRIDE { return true; }
374 bool hitTestColumns(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);
375 bool hitTestContents(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);
376 // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
377 virtual bool hitTestFloats(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&) { return false; }
379 virtual bool isPointInOverflowControl(HitTestResult&, const LayoutPoint& locationInContainer, const LayoutPoint& accumulatedOffset);
381 void computeBlockPreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const;
383 // Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline
385 virtual RenderBlock* firstLineBlock() const OVERRIDE;
387 virtual LayoutRect rectWithOutlineForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, LayoutUnit outlineWidth, const PaintInvalidationState* = 0) const OVERRIDE FINAL;
389 virtual RenderObject* hoverAncestor() const OVERRIDE FINAL;
390 virtual void updateDragState(bool dragOn) OVERRIDE FINAL;
391 virtual void childBecameNonInline(RenderObject* child) OVERRIDE FINAL;
393 virtual LayoutRect selectionRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer) const OVERRIDE FINAL
395 return selectionGapRectsForPaintInvalidation(paintInvalidationContainer);
397 bool isSelectionRoot() const;
398 GapRects blockSelectionGaps(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
399 LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo*) const;
400 LayoutRect blockSelectionGap(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
401 LayoutUnit lastLogicalTop, LayoutUnit lastLogicalLeft, LayoutUnit lastLogicalRight, LayoutUnit logicalBottom, const PaintInfo*) const;
403 // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
404 virtual void clipOutFloatingObjects(const RenderBlock*, const PaintInfo*, const LayoutPoint&, const LayoutSize&) const { };
406 virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const OVERRIDE;
407 virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const OVERRIDE;
409 LayoutUnit desiredColumnWidth() const;
412 virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0) OVERRIDE FINAL;
414 void adjustPointToColumnContents(LayoutPoint&) const;
416 void markLinesDirtyInBlockRange(LayoutUnit logicalTop, LayoutUnit logicalBottom, RootInlineBox* highest = 0);
418 Position positionForBox(InlineBox*, bool start = true) const;
419 PositionWithAffinity positionForPointWithInlineChildren(const LayoutPoint&);
421 void calcColumnWidth();
422 void makeChildrenAnonymousColumnBlocks(RenderObject* beforeChild, RenderBlockFlow* newBlockBox, RenderObject* newChild);
424 void splitBlocks(RenderBlock* fromBlock, RenderBlock* toBlock, RenderBlock* middleBlock,
425 RenderObject* beforeChild, RenderBoxModelObject* oldCont);
426 void splitFlow(RenderObject* beforeChild, RenderBlock* newBlockBox,
427 RenderObject* newChild, RenderBoxModelObject* oldCont);
428 RenderBlock* clone() const;
429 RenderBlock* continuationBefore(RenderObject* beforeChild);
430 RenderBlockFlow* containingColumnsBlock(bool allowAnonymousColumnBlock = true);
431 RenderBlockFlow* columnsBlockForSpanningElement(RenderObject* newChild);
433 // End helper functions and structs used by layoutBlockChildren.
435 void removeFromGlobalMaps();
436 bool widthAvailableToChildrenHasChanged();
439 // Returns the logicalOffset at the top of the next page. If the offset passed in is already at the top of the current page,
440 // then nextPageLogicalTop with ExcludePageBoundary will still move to the top of the next page. nextPageLogicalTop with
441 // IncludePageBoundary set will not.
443 // 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.
444 enum PageBoundaryRule { ExcludePageBoundary, IncludePageBoundary };
445 LayoutUnit nextPageLogicalTop(LayoutUnit logicalOffset, PageBoundaryRule = ExcludePageBoundary) const;
447 bool createsBlockFormattingContext() const;
450 LayoutUnit pageLogicalHeightForOffset(LayoutUnit offset) const;
451 LayoutUnit pageRemainingLogicalHeightForOffset(LayoutUnit offset, PageBoundaryRule = IncludePageBoundary) const;
454 // A page break is required at some offset due to space shortage in the current fragmentainer.
455 void setPageBreak(LayoutUnit offset, LayoutUnit spaceShortage);
457 // Update minimum page height required to avoid fragmentation where it shouldn't occur (inside
458 // unbreakable content, between orphans and widows, etc.). This will be used as a hint to the
459 // column balancer to help set a good minimum column height.
460 void updateMinimumPageHeight(LayoutUnit offset, LayoutUnit minHeight);
462 // Adjust from painting offsets to the local coords of this renderer
463 void offsetForContents(LayoutPoint&) const;
465 bool requiresColumns(int desiredColumnCount) const;
467 virtual bool updateLogicalWidthAndColumnWidth();
469 virtual bool canCollapseAnonymousBlockChild() const { return true; }
472 virtual LayoutUnit offsetFromLogicalTopOfFirstPage() const OVERRIDE FINAL;
475 RenderObjectChildList m_children;
476 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>.
478 LayoutUnit m_pageLogicalOffset;
480 unsigned m_hasMarginBeforeQuirk : 1; // Note these quirk values can't be put in RenderBlockRareData since they are set too frequently.
481 unsigned m_hasMarginAfterQuirk : 1;
482 unsigned m_beingDestroyed : 1;
483 unsigned m_hasMarkupTruncation : 1;
484 unsigned m_hasBorderOrPaddingLogicalWidthChanged : 1;
485 mutable unsigned m_hasOnlySelfCollapsingChildren : 1;
486 mutable unsigned m_descendantsWithFloatsMarkedForLayout : 1;
488 // RenderRubyBase objects need to be able to split and merge, moving their children around
489 // (calling moveChildTo, moveAllChildrenTo, and makeChildrenNonInline).
490 friend class RenderRubyBase;
491 // FIXME-BLOCKFLOW: Remove this when the line layout stuff has all moved out of RenderBlock
492 friend class LineBreaker;
494 // FIXME: This is temporary as we move code that accesses block flow
495 // member variables out of RenderBlock and into RenderBlockFlow.
496 friend class RenderBlockFlow;
499 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlock, isRenderBlock());
503 #endif // RenderBlock_h