1/*
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.
6 *
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.
11 *
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.
16 *
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.
21 */
22
23#ifndef RenderBlock_h
24#define RenderBlock_h
25
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"
37
38namespace blink {
39
40class LineInfo;
41class LineLayoutState;
42struct PaintInfo;
43class RenderInline;
44class RenderRubyRun;
45class RenderText;
46class WordMeasurement;
47
48template <class Run> class BidiRunList;
49typedef WTF::ListHashSet<RenderBox*, 16> TrackedRendererListHashSet;
50typedef WTF::HashMap<const RenderBlock*, OwnPtr<TrackedRendererListHashSet> > TrackedDescendantsMap;
51typedef WTF::HashMap<const RenderBox*, OwnPtr<HashSet<RenderBlock*> > > TrackedContainerMap;
52typedef Vector<WordMeasurement, 64> WordMeasurements;
53
54enum ContainingBlockState { NewContainingBlock, SameContainingBlock };
55
56typedef WTF::HashMap<RenderBlock*, OwnPtr<ListHashSet<RenderInline*> > > ContinuationOutlineTableMap;
57
58ContinuationOutlineTableMap* continuationOutlineTable();
59
60class RenderBlock : public RenderBox {
61public:
62    virtual void destroy() OVERRIDE;
63    virtual void trace(Visitor*) OVERRIDE;
64    friend class LineLayoutState;
65
66protected:
67    explicit RenderBlock(ContainerNode*);
68    virtual ~RenderBlock();
69
70public:
71    RenderObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
72    RenderObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }
73
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;
77
78    const RenderObjectChildList* children() const { return &m_children; }
79    RenderObjectChildList* children() { return &m_children; }
80
81    bool beingDestroyed() const { return m_beingDestroyed; }
82
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;
86
87    LayoutUnit minLineHeightForReplacedRenderer(bool isFirstLine, LayoutUnit replacedHeight) const;
88
89    RenderLineBoxList* lineBoxes() { return &m_lineBoxes; }
90
91protected:
92    InlineFlowBox* firstLineBox() const { return m_lineBoxes.firstLineBox(); }
93    InlineFlowBox* lastLineBox() const { return m_lineBoxes.lastLineBox(); }
94
95    RootInlineBox* firstRootBox() const { return static_cast<RootInlineBox*>(firstLineBox()); }
96    RootInlineBox* lastRootBox() const { return static_cast<RootInlineBox*>(lastLineBox()); }
97
98public:
99    // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
100    virtual void deleteLineBoxTree();
101
102    virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) OVERRIDE;
103    virtual void removeChild(RenderObject*) OVERRIDE;
104
105    virtual void layoutBlock(bool relayoutChildren);
106
107    void insertPositionedObject(RenderBox*);
108    static void removePositionedObject(RenderBox*);
109    void removePositionedObjects(RenderBlock*, ContainingBlockState = SameContainingBlock);
110
111    TrackedRendererListHashSet* positionedObjects() const;
112    bool hasPositionedObjects() const
113    {
114        TrackedRendererListHashSet* objects = positionedObjects();
115        return objects && !objects->isEmpty();
116    }
117
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*);
124
125    TrackedRendererListHashSet* percentHeightDescendants() const;
126    bool hasPercentHeightDescendants() const
127    {
128        TrackedRendererListHashSet* descendants = percentHeightDescendants();
129        return descendants && !descendants->isEmpty();
130    }
131
132    void setHasMarkupTruncation(bool b) { m_hasMarkupTruncation = b; }
133    bool hasMarkupTruncation() const { return m_hasMarkupTruncation; }
134
135    void setHasMarginBeforeQuirk(bool b) { m_hasMarginBeforeQuirk = b; }
136    void setHasMarginAfterQuirk(bool b) { m_hasMarginAfterQuirk = b; }
137
138    bool hasMarginBeforeQuirk() const { return m_hasMarginBeforeQuirk; }
139    bool hasMarginAfterQuirk() const { return m_hasMarginAfterQuirk; }
140
141    bool hasMarginBeforeQuirk(const RenderBox* child) const;
142    bool hasMarginAfterQuirk(const RenderBox* child) const;
143
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;
148
149    LayoutUnit textIndentOffset() const;
150
151    virtual PositionWithAffinity positionForPoint(const LayoutPoint&) OVERRIDE;
152
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;
155
156    LayoutPoint flipForWritingModeIncludingColumns(const LayoutPoint&) const;
157    void adjustStartEdgeForWritingModeIncludingColumns(LayoutRect&) const;
158
159    LayoutUnit blockDirectionOffset(const LayoutSize& offsetFromBlock) const;
160    LayoutUnit inlineDirectionOffset(const LayoutSize& offsetFromBlock) const;
161
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;
170
171    virtual void setSelectionState(SelectionState) OVERRIDE;
172
173    LayoutRect logicalRectToPhysicalRect(const LayoutPoint& physicalPosition, const LayoutRect& logicalRect) const;
174
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();
180
181    void adjustRectForColumns(LayoutRect&) const;
182    virtual LayoutSize columnOffset(const LayoutPoint&) const OVERRIDE;
183    void adjustForColumnRect(LayoutSize& offset, const LayoutPoint& locationInContainer) const;
184
185    void addContinuationWithOutline(RenderInline*);
186
187    virtual RenderBoxModelObject* virtualContinuation() const OVERRIDE FINAL { return continuation(); }
188    bool isAnonymousBlockContinuation() const { return continuation() && isAnonymousBlock(); }
189    RenderInline* inlineElementContinuation() const;
190    RenderBlock* blockElementContinuation() const;
191
192    using RenderBoxModelObject::continuation;
193    using RenderBoxModelObject::setContinuation;
194
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); }
201
202    virtual RenderBox* createAnonymousBoxWithSameTypeAs(const RenderObject* parent) const OVERRIDE;
203
204    ColumnInfo* columnInfo() const;
205    int columnGap() const;
206
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;
210
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; }
215
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;
231
232    virtual void updateFirstLetter();
233    virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE;
234
235    virtual void scrollbarsChanged(bool /*horizontalScrollbarChanged*/, bool /*verticalScrollbarChanged*/) { }
236
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(); }
242
243    virtual LayoutUnit logicalLeftSelectionOffset(const RenderBlock* rootBlock, LayoutUnit position) const;
244    virtual LayoutUnit logicalRightSelectionOffset(const RenderBlock* rootBlock, LayoutUnit position) const;
245
246    GapRects selectionGaps(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
247        LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo* = 0) const;
248
249#if ENABLE(ASSERT)
250    void checkPositionedObjectsNeedLayout();
251    bool paintsContinuationOutline(RenderInline* flow);
252#endif
253#ifndef NDEBUG
254    void showLineTreeAndMark(const InlineBox* = 0, const char* = 0, const InlineBox* = 0, const char* = 0, const RenderObject* = 0) const;
255#endif
256
257    bool recalcChildOverflowAfterStyleChange();
258    bool recalcOverflowAfterStyleChange();
259
260protected:
261    virtual void willBeDestroyed() OVERRIDE;
262
263    void dirtyForLayoutFromPercentageHeightDescendants(SubtreeLayoutScope&);
264
265    virtual void layout() OVERRIDE;
266    virtual bool updateImageLoadingPriorities() OVERRIDE FINAL;
267
268    enum PositionedLayoutBehavior {
269        DefaultLayout,
270        LayoutOnlyFixedPositionedObjects,
271        ForcedLayoutAfterContainingBlockMoved
272    };
273
274    void layoutPositionedObjects(bool relayoutChildren, PositionedLayoutBehavior = DefaultLayout);
275    void markFixedPositionObjectForLayoutIfNeeded(RenderObject* child, SubtreeLayoutScope&);
276
277    LayoutUnit marginIntrinsicLogicalWidthForChild(RenderBox* child) const;
278
279    int beforeMarginInLineDirection(LineDirectionMode) const;
280
281    virtual void paint(PaintInfo&, const LayoutPoint&) OVERRIDE;
282public:
283    virtual void paintObject(PaintInfo&, const LayoutPoint&) OVERRIDE;
284    virtual void paintChildren(PaintInfo&, const LayoutPoint&);
285
286    // FIXME-BLOCKFLOW: Remove virtualizaion when all callers have moved to RenderBlockFlow
287    virtual void paintFloats(PaintInfo&, const LayoutPoint&, bool) { }
288
289protected:
290    virtual void adjustInlineDirectionLineBounds(unsigned /* expansionOpportunityCount */, float& /* logicalLeft */, float& /* logicalWidth */) const { }
291
292    virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE;
293    virtual void computePreferredLogicalWidths() OVERRIDE;
294    void adjustIntrinsicLogicalWidthsForColumns(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const;
295
296    virtual int firstLineBoxBaseline() const OVERRIDE;
297    virtual int inlineBlockBaseline(LineDirectionMode) const OVERRIDE;
298    int lastLineBoxBaseline(LineDirectionMode) const;
299
300    virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&) OVERRIDE;
301
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();
309
310    void updateScrollInfoAfterLayout();
311
312    virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) OVERRIDE;
313    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
314
315    virtual bool hasLineIfEmpty() const;
316
317    bool simplifiedLayout();
318    virtual void simplifiedNormalFlowLayout();
319
320    void setDesiredColumnCountAndWidth(int, LayoutUnit);
321
322public:
323    virtual void computeOverflow(LayoutUnit oldClientAfterEdge, bool = false);
324protected:
325    virtual void addOverflowFromChildren();
326    void addOverflowFromPositionedObjects();
327    void addOverflowFromBlockChildren();
328    void addVisualOverflowFromTheme();
329
330    virtual void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer) const OVERRIDE;
331
332    virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const OVERRIDE;
333
334    void updateBlockChildDirtyBitsBeforeLayout(bool relayoutChildren, RenderBox*);
335
336    virtual bool isInlineBlockOrInlineTable() const OVERRIDE FINAL { return isInline() && isReplaced(); }
337
338    virtual void invalidatePaintOfSubtreesIfNeeded(const PaintInvalidationState& childPaintInvalidationState) OVERRIDE;
339
340private:
341    virtual RenderObjectChildList* virtualChildren() OVERRIDE FINAL { return children(); }
342    virtual const RenderObjectChildList* virtualChildren() const OVERRIDE FINAL { return children(); }
343
344    virtual const char* renderName() const OVERRIDE;
345
346    virtual bool isRenderBlock() const OVERRIDE FINAL { return true; }
347
348    void makeChildrenNonInline(RenderObject* insertionPoint = 0);
349    virtual void removeLeftoverAnonymousBlock(RenderBlock* child);
350
351    static void collapseAnonymousBlockChild(RenderBlock* parent, RenderBlock* child);
352
353    virtual void dirtyLinesFromChangedChild(RenderObject* child) OVERRIDE FINAL { m_lineBoxes.dirtyLinesFromChangedChild(this, child); }
354
355    void addChildToContinuation(RenderObject* newChild, RenderObject* beforeChild);
356    virtual void addChildIgnoringContinuation(RenderObject* newChild, RenderObject* beforeChild) OVERRIDE;
357    void addChildToAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild);
358
359    void addChildIgnoringAnonymousColumnBlocks(RenderObject* newChild, RenderObject* beforeChild = 0);
360
361    virtual bool isSelfCollapsingBlock() const OVERRIDE;
362
363    void insertIntoTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*&, TrackedContainerMap*&);
364    static void removeFromTrackedRendererMaps(RenderBox* descendant, TrackedDescendantsMap*&, TrackedContainerMap*&);
365
366    void createFirstLetterRenderer(RenderObject* firstLetterBlock, RenderText& currentChild, unsigned length);
367    void updateFirstLetterStyle(RenderObject* firstLetterBlock, RenderObject* firstLetterContainer);
368
369    Node* nodeForHitTest() const;
370
371private:
372    virtual bool avoidsFloats() const OVERRIDE { return true; }
373
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; }
378
379    virtual bool isPointInOverflowControl(HitTestResult&, const LayoutPoint& locationInContainer, const LayoutPoint& accumulatedOffset);
380
381    void computeBlockPreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const;
382
383    // Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline
384    // children.
385    virtual RenderBlock* firstLineBlock() const OVERRIDE;
386
387    virtual LayoutRect rectWithOutlineForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, LayoutUnit outlineWidth, const PaintInvalidationState* = 0) const OVERRIDE FINAL;
388
389    virtual RenderObject* hoverAncestor() const OVERRIDE FINAL;
390    virtual void updateDragState(bool dragOn) OVERRIDE FINAL;
391    virtual void childBecameNonInline(RenderObject* child) OVERRIDE FINAL;
392
393    virtual LayoutRect selectionRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer) const OVERRIDE FINAL
394    {
395        return selectionGapRectsForPaintInvalidation(paintInvalidationContainer);
396    }
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;
402
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 { };
405
406    virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const OVERRIDE;
407    virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const OVERRIDE;
408
409    LayoutUnit desiredColumnWidth() const;
410
411private:
412    virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0) OVERRIDE FINAL;
413
414    void adjustPointToColumnContents(LayoutPoint&) const;
415
416    void markLinesDirtyInBlockRange(LayoutUnit logicalTop, LayoutUnit logicalBottom, RootInlineBox* highest = 0);
417
418    Position positionForBox(InlineBox*, bool start = true) const;
419    PositionWithAffinity positionForPointWithInlineChildren(const LayoutPoint&);
420
421    void calcColumnWidth();
422    void makeChildrenAnonymousColumnBlocks(RenderObject* beforeChild, RenderBlockFlow* newBlockBox, RenderObject* newChild);
423
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);
432
433    // End helper functions and structs used by layoutBlockChildren.
434
435    void removeFromGlobalMaps();
436    bool widthAvailableToChildrenHasChanged();
437
438protected:
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.
442    //
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;
446
447    bool createsBlockFormattingContext() const;
448
449public:
450    LayoutUnit pageLogicalHeightForOffset(LayoutUnit offset) const;
451    LayoutUnit pageRemainingLogicalHeightForOffset(LayoutUnit offset, PageBoundaryRule = IncludePageBoundary) const;
452
453protected:
454    // A page break is required at some offset due to space shortage in the current fragmentainer.
455    void setPageBreak(LayoutUnit offset, LayoutUnit spaceShortage);
456
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);
461
462    // Adjust from painting offsets to the local coords of this renderer
463    void offsetForContents(LayoutPoint&) const;
464
465    bool requiresColumns(int desiredColumnCount) const;
466
467    virtual bool updateLogicalWidthAndColumnWidth();
468
469    virtual bool canCollapseAnonymousBlockChild() const { return true; }
470
471public:
472    virtual LayoutUnit offsetFromLogicalTopOfFirstPage() const OVERRIDE FINAL;
473
474protected:
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>.
477
478    LayoutUnit m_pageLogicalOffset;
479
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;
487
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;
493
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;
497};
498
499DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlock, isRenderBlock());
500
501} // namespace blink
502
503#endif // RenderBlock_h
504