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"
42 class LayoutStateMaintainer;
43 class LineLayoutState;
51 class WordMeasurement;
53 template <class Run> class BidiRunList;
54 typedef WTF::ListHashSet<RenderBox*, 16> TrackedRendererListHashSet;
55 typedef WTF::HashMap<const RenderBlock*, OwnPtr<TrackedRendererListHashSet> > TrackedDescendantsMap;
56 typedef WTF::HashMap<const RenderBox*, OwnPtr<HashSet<RenderBlock*> > > TrackedContainerMap;
57 typedef Vector<WordMeasurement, 64> WordMeasurements;
59 enum CaretType { CursorCaret, DragCaret };
60 enum ContainingBlockState { NewContainingBlock, SameContainingBlock };
63 DefaultTextRunFlags = 0,
64 RespectDirection = 1 << 0,
65 RespectDirectionOverride = 1 << 1
68 typedef unsigned TextRunFlags;
70 class RenderBlock : public RenderBox {
72 friend class LineLayoutState;
75 explicit RenderBlock(ContainerNode*);
76 virtual ~RenderBlock();
79 RenderObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
80 RenderObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }
82 const RenderObjectChildList* children() const { return &m_children; }
83 RenderObjectChildList* children() { return &m_children; }
85 bool beingDestroyed() const { return m_beingDestroyed; }
87 // These two functions are overridden for inline-block.
88 virtual LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const OVERRIDE FINAL;
89 virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const OVERRIDE;
91 LayoutUnit minLineHeightForReplacedRenderer(bool isFirstLine, LayoutUnit replacedHeight) const;
93 RenderLineBoxList* lineBoxes() { return &m_lineBoxes; }
95 InlineFlowBox* firstLineBox() const { return m_lineBoxes.firstLineBox(); }
96 InlineFlowBox* lastLineBox() const { return m_lineBoxes.lastLineBox(); }
98 // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
99 virtual void deleteLineBoxTree();
101 virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) OVERRIDE;
102 virtual void removeChild(RenderObject*) OVERRIDE;
104 virtual void layoutBlock(bool relayoutChildren);
106 void insertPositionedObject(RenderBox*);
107 static void removePositionedObject(RenderBox*);
108 void removePositionedObjects(RenderBlock*, ContainingBlockState = SameContainingBlock);
110 TrackedRendererListHashSet* positionedObjects() const;
111 bool hasPositionedObjects() const
113 TrackedRendererListHashSet* objects = positionedObjects();
114 return objects && !objects->isEmpty();
117 void addPercentHeightDescendant(RenderBox*);
118 static void removePercentHeightDescendant(RenderBox*);
119 static bool hasPercentHeightContainerMap();
120 static bool hasPercentHeightDescendant(RenderBox*);
121 static void clearPercentHeightDescendantsFrom(RenderBox*);
122 static void removePercentHeightDescendantIfNeeded(RenderBox*);
124 TrackedRendererListHashSet* percentHeightDescendants() const;
125 bool hasPercentHeightDescendants() const
127 TrackedRendererListHashSet* descendants = percentHeightDescendants();
128 return descendants && !descendants->isEmpty();
131 void setHasMarkupTruncation(bool b) { m_hasMarkupTruncation = b; }
132 bool hasMarkupTruncation() const { return m_hasMarkupTruncation; }
134 void setHasMarginBeforeQuirk(bool b) { m_hasMarginBeforeQuirk = b; }
135 void setHasMarginAfterQuirk(bool b) { m_hasMarginAfterQuirk = b; }
137 bool hasMarginBeforeQuirk() const { return m_hasMarginBeforeQuirk; }
138 bool hasMarginAfterQuirk() const { return m_hasMarginAfterQuirk; }
140 bool hasMarginBeforeQuirk(const RenderBox* child) const;
141 bool hasMarginAfterQuirk(const RenderBox* child) const;
143 void markPositionedObjectsForLayout();
144 // FIXME: Do we really need this to be virtual? It's just so we can call this on
145 // RenderBoxes without needed to check whether they're RenderBlocks first.
146 virtual void markForPaginationRelayoutIfNeeded(SubtreeLayoutScope&) OVERRIDE FINAL;
148 // FIXME-BLOCKFLOW: Remove virtualizaion when all of the line layout code has been moved out of RenderBlock
149 virtual bool containsFloats() const { return false; }
151 LayoutUnit textIndentOffset() const;
153 virtual PositionWithAffinity positionForPoint(const LayoutPoint&) OVERRIDE;
155 // Block flows subclass availableWidth to handle multi column layout (shrinking the width available to children when laying out.)
156 virtual LayoutUnit availableLogicalWidth() const OVERRIDE FINAL;
158 LayoutPoint flipForWritingModeIncludingColumns(const LayoutPoint&) const;
159 void adjustStartEdgeForWritingModeIncludingColumns(LayoutRect&) const;
161 LayoutUnit blockDirectionOffset(const LayoutSize& offsetFromBlock) const;
162 LayoutUnit inlineDirectionOffset(const LayoutSize& offsetFromBlock) const;
164 RootInlineBox* firstRootBox() const { return static_cast<RootInlineBox*>(firstLineBox()); }
165 RootInlineBox* lastRootBox() const { return static_cast<RootInlineBox*>(lastLineBox()); }
167 GapRects selectionGapRectsForRepaint(const RenderLayerModelObject* repaintContainer);
168 LayoutRect logicalLeftSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
169 RenderObject* selObj, LayoutUnit logicalLeft, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo*);
170 LayoutRect logicalRightSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
171 RenderObject* selObj, LayoutUnit logicalRight, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo*);
172 void getSelectionGapInfo(SelectionState, bool& leftGap, bool& rightGap);
173 RenderBlock* blockBeforeWithinSelectionRoot(LayoutSize& offset) const;
175 LayoutRect logicalRectToPhysicalRect(const LayoutPoint& physicalPosition, const LayoutRect& logicalRect);
177 // Helper methods for computing line counts and heights for line counts.
178 RootInlineBox* lineAtIndex(int) const;
179 int lineCount(const RootInlineBox* = 0, bool* = 0) const;
180 int heightForLineCount(int);
181 void clearTruncation();
183 void adjustRectForColumns(LayoutRect&) const;
184 virtual LayoutSize columnOffset(const LayoutPoint&) const OVERRIDE;
185 void adjustForColumnRect(LayoutSize& offset, const LayoutPoint& locationInContainer) const;
187 void addContinuationWithOutline(RenderInline*);
188 bool paintsContinuationOutline(RenderInline*);
190 virtual RenderBoxModelObject* virtualContinuation() const OVERRIDE FINAL { return continuation(); }
191 bool isAnonymousBlockContinuation() const { return continuation() && isAnonymousBlock(); }
192 RenderInline* inlineElementContinuation() const;
193 RenderBlock* blockElementContinuation() const;
195 using RenderBoxModelObject::continuation;
196 using RenderBoxModelObject::setContinuation;
198 static RenderBlock* createAnonymousWithParentRendererAndDisplay(const RenderObject*, EDisplay = BLOCK);
199 static RenderBlockFlow* createAnonymousColumnsWithParentRenderer(const RenderObject*);
200 static RenderBlockFlow* createAnonymousColumnSpanWithParentRenderer(const RenderObject*);
201 RenderBlock* createAnonymousBlock(EDisplay display = BLOCK) const { return createAnonymousWithParentRendererAndDisplay(this, display); }
202 RenderBlockFlow* createAnonymousColumnsBlock() const { return createAnonymousColumnsWithParentRenderer(this); }
203 RenderBlockFlow* createAnonymousColumnSpanBlock() const { return createAnonymousColumnSpanWithParentRenderer(this); }
205 virtual RenderBox* createAnonymousBoxWithSameTypeAs(const RenderObject* parent) const OVERRIDE;
207 ColumnInfo* columnInfo() const;
208 int columnGap() const;
210 // These two functions take the ColumnInfo* to avoid repeated lookups of the info in the global HashMap.
211 unsigned columnCount(ColumnInfo*) const;
212 LayoutRect columnRectAt(ColumnInfo*, unsigned) const;
214 LayoutUnit paginationStrut() const { return m_rareData ? m_rareData->m_paginationStrut : LayoutUnit(); }
215 void setPaginationStrut(LayoutUnit);
217 bool shouldBreakAtLineToAvoidWidow() const { return m_rareData && m_rareData->m_lineBreakToAvoidWidow >= 0; }
218 void clearShouldBreakAtLineToAvoidWidow() const;
219 int lineBreakToAvoidWidow() const { return m_rareData ? m_rareData->m_lineBreakToAvoidWidow : -1; }
220 void setBreakAtLineToAvoidWidow(int);
221 void clearDidBreakAtLineToAvoidWidow();
222 void setDidBreakAtLineToAvoidWidow();
223 bool didBreakAtLineToAvoidWidow() const { return m_rareData && m_rareData->m_didBreakAtLineToAvoidWidow; }
225 // The page logical offset is the object's offset from the top of the page in the page progression
226 // direction (so an x-offset in vertical text and a y-offset for horizontal text).
227 LayoutUnit pageLogicalOffset() const { return m_rareData ? m_rareData->m_pageLogicalOffset : LayoutUnit(); }
228 void setPageLogicalOffset(LayoutUnit);
230 // Accessors for logical width/height and margins in the containing block's block-flow direction.
231 LayoutUnit logicalWidthForChild(const RenderBox* child) const { return isHorizontalWritingMode() ? child->width() : child->height(); }
232 LayoutUnit logicalHeightForChild(const RenderBox* child) const { return isHorizontalWritingMode() ? child->height() : child->width(); }
233 LayoutSize logicalSizeForChild(const RenderBox* child) const { return isHorizontalWritingMode() ? child->size() : child->size().transposedSize(); }
234 LayoutUnit logicalTopForChild(const RenderBox* child) const { return isHorizontalWritingMode() ? child->y() : child->x(); }
235 LayoutUnit marginBeforeForChild(const RenderBoxModelObject* child) const { return child->marginBefore(style()); }
236 LayoutUnit marginAfterForChild(const RenderBoxModelObject* child) const { return child->marginAfter(style()); }
237 LayoutUnit marginStartForChild(const RenderBoxModelObject* child) const { return child->marginStart(style()); }
238 LayoutUnit marginEndForChild(const RenderBoxModelObject* child) const { return child->marginEnd(style()); }
239 void setMarginStartForChild(RenderBox* child, LayoutUnit value) const { child->setMarginStart(value, style()); }
240 void setMarginEndForChild(RenderBox* child, LayoutUnit value) const { child->setMarginEnd(value, style()); }
241 void setMarginBeforeForChild(RenderBox* child, LayoutUnit value) const { child->setMarginBefore(value, style()); }
242 void setMarginAfterForChild(RenderBox* child, LayoutUnit value) const { child->setMarginAfter(value, style()); }
243 LayoutUnit collapsedMarginBeforeForChild(const RenderBox* child) const;
244 LayoutUnit collapsedMarginAfterForChild(const RenderBox* child) const;
246 virtual void updateFirstLetter();
248 virtual void scrollbarsChanged(bool /*horizontalScrollbarChanged*/, bool /*verticalScrollbarChanged*/) { };
250 LayoutUnit availableLogicalWidthForContent() const { return max<LayoutUnit>(0, logicalRightOffsetForContent() - logicalLeftOffsetForContent()); }
251 LayoutUnit logicalLeftOffsetForContent() const { return isHorizontalWritingMode() ? borderLeft() + paddingLeft() : borderTop() + paddingTop(); }
252 LayoutUnit logicalRightOffsetForContent() const { return logicalLeftOffsetForContent() + availableLogicalWidth(); }
253 LayoutUnit startOffsetForContent() const { return style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }
254 LayoutUnit endOffsetForContent() const { return !style()->isLeftToRightDirection() ? logicalLeftOffsetForContent() : logicalWidth() - logicalRightOffsetForContent(); }
257 void checkPositionedObjectsNeedLayout();
258 void showLineTreeAndMark(const InlineBox* = 0, const char* = 0, const InlineBox* = 0, const char* = 0, const RenderObject* = 0) const;
261 // inline-block elements paint all phases atomically. This function ensures that. Certain other elements
262 // (grid items, flex items) require this behavior as well, and this function exists as a helper for them.
263 // It is expected that the caller will call this function independent of the value of paintInfo.phase.
264 static void paintAsInlineBlock(RenderObject*, PaintInfo&, const LayoutPoint&);
266 bool recalcChildOverflowAfterStyleChange();
267 bool recalcOverflowAfterStyleChange();
270 virtual void willBeDestroyed() OVERRIDE;
272 void dirtyForLayoutFromPercentageHeightDescendants(SubtreeLayoutScope&);
274 virtual void layout() OVERRIDE;
275 virtual bool updateImageLoadingPriorities() OVERRIDE FINAL;
277 enum PositionedLayoutBehavior {
279 LayoutOnlyFixedPositionedObjects,
280 ForcedLayoutAfterContainingBlockMoved
283 void layoutPositionedObjects(bool relayoutChildren, PositionedLayoutBehavior = DefaultLayout);
284 void markFixedPositionObjectForLayoutIfNeeded(RenderObject* child, SubtreeLayoutScope&);
286 LayoutUnit marginIntrinsicLogicalWidthForChild(RenderBox* child) const;
288 int beforeMarginInLineDirection(LineDirectionMode) const;
290 virtual void paint(PaintInfo&, const LayoutPoint&) OVERRIDE;
291 virtual void paintObject(PaintInfo&, const LayoutPoint&) OVERRIDE;
292 virtual void paintChildren(PaintInfo&, const LayoutPoint&);
293 void paintChild(RenderBox*, PaintInfo&, const LayoutPoint&);
294 void paintChildAsInlineBlock(RenderBox*, PaintInfo&, const LayoutPoint&);
296 virtual void adjustInlineDirectionLineBounds(unsigned /* expansionOpportunityCount */, float& /* logicalLeft */, float& /* logicalWidth */) const { }
298 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE;
300 virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE;
301 virtual void computePreferredLogicalWidths() OVERRIDE;
302 void adjustIntrinsicLogicalWidthsForColumns(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const;
304 virtual int firstLineBoxBaseline() const OVERRIDE;
305 virtual int inlineBlockBaseline(LineDirectionMode) const OVERRIDE;
306 int lastLineBoxBaseline(LineDirectionMode) const;
308 virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&) OVERRIDE;
310 // Delay update scrollbar until finishDelayRepaint() will be
311 // called. This function is used when a flexbox is laying out its
312 // descendant. If multiple calls are made to startDelayRepaint(),
313 // finishDelayRepaint() will do nothing until finishDelayRepaint()
314 // is called the same number of times.
315 static void startDelayUpdateScrollInfo();
316 static void finishDelayUpdateScrollInfo();
318 void updateScrollInfoAfterLayout();
320 virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) OVERRIDE;
321 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
323 virtual bool hasLineIfEmpty() const;
325 bool simplifiedLayout();
326 virtual void simplifiedNormalFlowLayout();
328 void setDesiredColumnCountAndWidth(int, LayoutUnit);
330 bool avoidsOrIgnoresFloats() { return isFloatingOrOutOfFlowPositioned() || avoidsFloats(); }
332 virtual void computeOverflow(LayoutUnit oldClientAfterEdge, bool = false);
334 virtual void addOverflowFromChildren();
335 void addOverflowFromPositionedObjects();
336 void addOverflowFromBlockChildren();
337 void addVisualOverflowFromTheme();
339 virtual void addFocusRingRects(Vector<IntRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer = 0) OVERRIDE;
341 virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const OVERRIDE;
343 void computeRegionRangeForBlock(RenderFlowThread*);
345 void updateBlockChildDirtyBitsBeforeLayout(bool relayoutChildren, RenderBox*);
347 virtual bool isInlineBlockOrInlineTable() const OVERRIDE FINAL { return isInline() && isReplaced(); }
349 virtual void repaintTreeAfterLayout() OVERRIDE;
352 virtual RenderObjectChildList* virtualChildren() OVERRIDE FINAL { return children(); }
353 virtual const RenderObjectChildList* virtualChildren() const OVERRIDE FINAL { return children(); }
355 virtual const char* renderName() const OVERRIDE;
357 virtual bool isRenderBlock() const OVERRIDE FINAL { return true; }
359 void makeChildrenNonInline(RenderObject* insertionPoint = 0);
360 virtual void removeLeftoverAnonymousBlock(RenderBlock* child);
362 static void collapseAnonymousBlockChild(RenderBlock* parent, RenderBlock* child);
364 virtual void dirtyLinesFromChangedChild(RenderObject* child) OVERRIDE FINAL { m_lineBoxes.dirtyLinesFromChangedChild(this, child); }
366 void addChildToContinuation(RenderObject* newChild, RenderObject* beforeChild);
367 virtual void addChildIgnoringContinuation(RenderObject* newChild, RenderObject* beforeChild) OVERRIDE;
368 void addChildToAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild);
370 void addChildIgnoringAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild = 0);
372 virtual bool isSelfCollapsingBlock() const OVERRIDE;
374 void insertIntoTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*&, TrackedContainerMap*&);
375 static void removeFromTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*&, TrackedContainerMap*&);
377 void createFirstLetterRenderer(RenderObject* firstLetterBlock, RenderObject* currentChild, unsigned length);
378 void updateFirstLetterStyle(RenderObject* firstLetterBlock, RenderObject* firstLetterContainer);
380 Node* nodeForHitTest() const;
382 // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
383 virtual void paintFloats(PaintInfo&, const LayoutPoint&, bool) { }
384 void paintContents(PaintInfo&, const LayoutPoint&);
385 void paintColumnContents(PaintInfo&, const LayoutPoint&, bool paintFloats = false);
386 void paintColumnRules(PaintInfo&, const LayoutPoint&);
387 void paintSelection(PaintInfo&, const LayoutPoint&);
388 void paintCaret(PaintInfo&, const LayoutPoint&, CaretType);
390 bool hasCaret() const { return hasCaret(CursorCaret) || hasCaret(DragCaret); }
391 bool hasCaret(CaretType) const;
393 bool hitTestColumns(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);
394 bool hitTestContents(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);
395 // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
396 virtual bool hitTestFloats(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&) { return false; }
398 virtual bool isPointInOverflowControl(HitTestResult&, const LayoutPoint& locationInContainer, const LayoutPoint& accumulatedOffset);
400 void computeBlockPreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const;
402 // Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline
404 virtual RenderBlock* firstLineBlock() const OVERRIDE;
406 virtual LayoutRect rectWithOutlineForRepaint(const RenderLayerModelObject* repaintContainer, LayoutUnit outlineWidth) const OVERRIDE FINAL;
407 virtual RenderStyle* outlineStyleForRepaint() const OVERRIDE FINAL;
409 virtual RenderObject* hoverAncestor() const OVERRIDE FINAL;
410 virtual void updateDragState(bool dragOn) OVERRIDE FINAL;
411 virtual void childBecameNonInline(RenderObject* child) OVERRIDE FINAL;
413 virtual LayoutRect selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool /*clipToVisibleContent*/) OVERRIDE FINAL
415 return selectionGapRectsForRepaint(repaintContainer);
417 virtual bool shouldPaintSelectionGaps() const OVERRIDE FINAL;
418 bool isSelectionRoot() const;
419 GapRects selectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
420 LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo* = 0);
421 GapRects blockSelectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
422 LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo*);
423 LayoutRect blockSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
424 LayoutUnit lastLogicalTop, LayoutUnit lastLogicalLeft, LayoutUnit lastLogicalRight, LayoutUnit logicalBottom, const PaintInfo*);
425 virtual LayoutUnit logicalLeftSelectionOffset(RenderBlock* rootBlock, LayoutUnit position);
426 virtual LayoutUnit logicalRightSelectionOffset(RenderBlock* rootBlock, LayoutUnit position);
428 // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
429 virtual void clipOutFloatingObjects(RenderBlock*, const PaintInfo*, const LayoutPoint&, const LayoutSize&) { };
431 virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const OVERRIDE;
432 virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const OVERRIDE;
434 LayoutUnit desiredColumnWidth() const;
436 void paintContinuationOutlines(PaintInfo&, const LayoutPoint&);
438 virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0) OVERRIDE FINAL;
440 void adjustPointToColumnContents(LayoutPoint&) const;
442 void fitBorderToLinesIfNeeded(); // Shrink the box in which the border paints if border-fit is set.
443 virtual void adjustForBorderFit(LayoutUnit x, LayoutUnit& left, LayoutUnit& right) const; // Helper function for borderFitAdjust
445 void markLinesDirtyInBlockRange(LayoutUnit logicalTop, LayoutUnit logicalBottom, RootInlineBox* highest = 0);
447 Position positionForBox(InlineBox*, bool start = true) const;
448 PositionWithAffinity positionForPointWithInlineChildren(const LayoutPoint&);
450 void calcColumnWidth();
451 void makeChildrenAnonymousColumnBlocks(RenderObject* beforeChild, RenderBlockFlow* newBlockBox, RenderObject* newChild);
453 void splitBlocks(RenderBlock* fromBlock, RenderBlock* toBlock, RenderBlock* middleBlock,
454 RenderObject* beforeChild, RenderBoxModelObject* oldCont);
455 void splitFlow(RenderObject* beforeChild, RenderBlock* newBlockBox,
456 RenderObject* newChild, RenderBoxModelObject* oldCont);
457 RenderBlock* clone() const;
458 RenderBlock* continuationBefore(RenderObject* beforeChild);
459 RenderBlockFlow* containingColumnsBlock(bool allowAnonymousColumnBlock = true);
460 RenderBlockFlow* columnsBlockForSpanningElement(RenderObject* newChild);
462 // End helper functions and structs used by layoutBlockChildren.
465 // Returns the logicalOffset at the top of the next page. If the offset passed in is already at the top of the current page,
466 // then nextPageLogicalTop with ExcludePageBoundary will still move to the top of the next page. nextPageLogicalTop with
467 // IncludePageBoundary set will not.
469 // 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.
470 enum PageBoundaryRule { ExcludePageBoundary, IncludePageBoundary };
471 LayoutUnit nextPageLogicalTop(LayoutUnit logicalOffset, PageBoundaryRule = ExcludePageBoundary) const;
474 LayoutUnit pageLogicalTopForOffset(LayoutUnit offset) const;
475 LayoutUnit pageLogicalHeightForOffset(LayoutUnit offset) const;
476 LayoutUnit pageRemainingLogicalHeightForOffset(LayoutUnit offset, PageBoundaryRule = IncludePageBoundary) const;
479 // A page break is required at some offset due to space shortage in the current fragmentainer.
480 void setPageBreak(LayoutUnit offset, LayoutUnit spaceShortage);
482 // Update minimum page height required to avoid fragmentation where it shouldn't occur (inside
483 // unbreakable content, between orphans and widows, etc.). This will be used as a hint to the
484 // column balancer to help set a good minimum column height.
485 void updateMinimumPageHeight(LayoutUnit offset, LayoutUnit minHeight);
487 LayoutUnit adjustForUnsplittableChild(RenderBox* child, LayoutUnit logicalOffset, bool includeMargins = false); // If the child is unsplittable and can't fit on the current page, return the top of the next page/column.
488 void adjustLinePositionForPagination(RootInlineBox*, LayoutUnit& deltaOffset, RenderFlowThread*); // Computes a deltaOffset value that put a line at the top of the next page if it doesn't fit on the current page.
490 // Adjust from painting offsets to the local coords of this renderer
491 void offsetForContents(LayoutPoint&) const;
493 bool requiresColumns(int desiredColumnCount) const;
495 virtual bool updateLogicalWidthAndColumnWidth();
497 virtual bool canCollapseAnonymousBlockChild() const { return true; }
500 virtual LayoutUnit offsetFromLogicalTopOfFirstPage() const OVERRIDE FINAL;
502 void invalidateLineHeight() { m_lineHeight = -1; }
506 // Allocated only when some of these fields have non-default values
507 struct RenderBlockRareData {
508 WTF_MAKE_NONCOPYABLE(RenderBlockRareData); WTF_MAKE_FAST_ALLOCATED;
510 RenderBlockRareData()
511 : m_paginationStrut(0)
512 , m_pageLogicalOffset(0)
513 , m_lineBreakToAvoidWidow(-1)
514 , m_didBreakAtLineToAvoidWidow(false)
518 LayoutUnit m_paginationStrut;
519 LayoutUnit m_pageLogicalOffset;
521 int m_lineBreakToAvoidWidow : 31;
522 unsigned m_didBreakAtLineToAvoidWidow : 1;
526 OwnPtr<RenderBlockRareData> m_rareData;
528 RenderObjectChildList m_children;
529 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>.
531 mutable signed m_lineHeight : 26;
532 unsigned m_hasMarginBeforeQuirk : 1; // Note these quirk values can't be put in RenderBlockRareData since they are set too frequently.
533 unsigned m_hasMarginAfterQuirk : 1;
534 unsigned m_beingDestroyed : 1;
535 unsigned m_hasMarkupTruncation : 1;
536 unsigned m_hasBorderOrPaddingLogicalWidthChanged : 1;
537 mutable unsigned m_hasOnlySelfCollapsingChildren : 1;
539 // RenderRubyBase objects need to be able to split and merge, moving their children around
540 // (calling moveChildTo, moveAllChildrenTo, and makeChildrenNonInline).
541 friend class RenderRubyBase;
542 // FIXME-BLOCKFLOW: Remove this when the line layout stuff has all moved out of RenderBlock
543 friend class LineBreaker;
545 // FIXME: This is temporary as we move code that accesses block flow
546 // member variables out of RenderBlock and into RenderBlockFlow.
547 friend class RenderBlockFlow;
550 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlock, isRenderBlock());
552 } // namespace WebCore
554 #endif // RenderBlock_h