1 /* 2 * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * (C) 1999 Antti Koivisto (koivisto (at) kde.org) 4 * (C) 2007 David Smith (catfish.man (at) 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 "DeprecatedPtrList.h" 27 #include "GapRects.h" 28 #include "RenderBox.h" 29 #include "RenderLineBoxList.h" 30 #include "RootInlineBox.h" 31 #include <wtf/ListHashSet.h> 32 33 namespace WebCore { 34 35 class InlineIterator; 36 class RenderInline; 37 38 struct BidiRun; 39 40 template <class Iterator, class Run> class BidiResolver; 41 template <class Iterator> class MidpointState; 42 typedef BidiResolver<InlineIterator, BidiRun> InlineBidiResolver; 43 typedef MidpointState<InlineIterator> LineMidpointState; 44 45 enum CaretType { CursorCaret, DragCaret }; 46 47 class RenderBlock : public RenderBox { 48 public: 49 RenderBlock(Node*); 50 virtual ~RenderBlock(); 51 52 const RenderObjectChildList* children() const { return &m_children; } 53 RenderObjectChildList* children() { return &m_children; } 54 55 virtual void destroy(); 56 57 // These two functions are overridden for inline-block. 58 virtual int lineHeight(bool firstLine, bool isRootLineBox = false) const; 59 virtual int baselinePosition(bool firstLine, bool isRootLineBox = false) const; 60 61 RenderLineBoxList* lineBoxes() { return &m_lineBoxes; } 62 const RenderLineBoxList* lineBoxes() const { return &m_lineBoxes; } 63 64 InlineFlowBox* firstLineBox() const { return m_lineBoxes.firstLineBox(); } 65 InlineFlowBox* lastLineBox() const { return m_lineBoxes.lastLineBox(); } 66 67 void deleteLineBoxTree(); 68 69 virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0); 70 virtual void removeChild(RenderObject*); 71 72 virtual void layoutBlock(bool relayoutChildren); 73 74 void insertPositionedObject(RenderBox*); 75 void removePositionedObject(RenderBox*); 76 void removePositionedObjects(RenderBlock*); 77 78 void addPercentHeightDescendant(RenderBox*); 79 static void removePercentHeightDescendant(RenderBox*); 80 HashSet<RenderBox*>* percentHeightDescendants() const; 81 82 RootInlineBox* createAndAppendRootInlineBox(); 83 84 bool generatesLineBoxesForInlineChild(RenderObject*, bool isLineEmpty = true, bool previousLineBrokeCleanly = true); 85 86 void markAllDescendantsWithFloatsForLayout(RenderBox* floatToRemove = 0, bool inLayout = true); 87 void markPositionedObjectsForLayout(); 88 89 bool containsFloats() { return m_floatingObjects && !m_floatingObjects->isEmpty(); } 90 bool containsFloat(RenderObject*); 91 92 IntRect floatRect() const; 93 94 int lineWidth(int y, bool firstLine) const; 95 96 virtual int lowestPosition(bool includeOverflowInterior = true, bool includeSelf = true) const; 97 virtual int rightmostPosition(bool includeOverflowInterior = true, bool includeSelf = true) const; 98 virtual int leftmostPosition(bool includeOverflowInterior = true, bool includeSelf = true) const; 99 100 int rightOffset(int y, bool firstLine) const { return rightRelOffset(y, rightOffset(), firstLine); } 101 int leftOffset(int y, bool firstLine) const { return leftRelOffset(y, leftOffset(), firstLine); } 102 103 virtual VisiblePosition positionForPoint(const IntPoint&); 104 105 // Block flows subclass availableWidth to handle multi column layout (shrinking the width available to children when laying out.) 106 virtual int availableWidth() const; 107 108 RootInlineBox* firstRootBox() const { return static_cast<RootInlineBox*>(firstLineBox()); } 109 RootInlineBox* lastRootBox() const { return static_cast<RootInlineBox*>(lastLineBox()); } 110 111 bool containsNonZeroBidiLevel() const; 112 113 virtual void setSelectionState(SelectionState s); 114 115 GapRects selectionGapRectsForRepaint(RenderBoxModelObject* repaintContainer); 116 IntRect fillLeftSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock, 117 int blockX, int blockY, int tx, int ty, const PaintInfo*); 118 IntRect fillRightSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock, 119 int blockX, int blockY, int tx, int ty, const PaintInfo*); 120 IntRect fillHorizontalSelectionGap(RenderObject* selObj, int xPos, int yPos, int width, int height, const PaintInfo*); 121 122 void getHorizontalSelectionGapInfo(SelectionState, bool& leftGap, bool& rightGap); 123 124 // Helper methods for computing line counts and heights for line counts. 125 RootInlineBox* lineAtIndex(int); 126 int lineCount(); 127 int heightForLineCount(int); 128 void clearTruncation(); 129 130 void adjustRectForColumns(IntRect&) const; 131 132 void addContinuationWithOutline(RenderInline*); 133 134 RenderInline* inlineContinuation() const { return m_inlineContinuation; } 135 void setInlineContinuation(RenderInline* c) { m_inlineContinuation = c; } 136 137 // This function is a convenience helper for creating an anonymous block that inherits its 138 // style from this RenderBlock. 139 RenderBlock* createAnonymousBlock(bool isFlexibleBox = false) const; 140 141 static void appendRunsForObject(int start, int end, RenderObject*, InlineBidiResolver&); 142 static bool requiresLineBox(const InlineIterator&, bool isLineEmpty = true, bool previousLineBrokeCleanly = true); 143 144 protected: 145 void moveChildTo(RenderObject* to, RenderObjectChildList* toChildList, RenderObject* child); 146 void moveChildTo(RenderObject* to, RenderObjectChildList* toChildList, RenderObject* beforeChild, RenderObject* child); 147 void moveAllChildrenTo(RenderObject* to, RenderObjectChildList* toChildList); 148 void moveAllChildrenTo(RenderObject* to, RenderObjectChildList* toChildList, RenderObject* beforeChild); 149 150 int maxTopPosMargin() const { return m_maxMargin ? m_maxMargin->m_topPos : MaxMargin::topPosDefault(this); } 151 int maxTopNegMargin() const { return m_maxMargin ? m_maxMargin->m_topNeg : MaxMargin::topNegDefault(this); } 152 int maxBottomPosMargin() const { return m_maxMargin ? m_maxMargin->m_bottomPos : MaxMargin::bottomPosDefault(this); } 153 int maxBottomNegMargin() const { return m_maxMargin ? m_maxMargin->m_bottomNeg : MaxMargin::bottomNegDefault(this); } 154 void setMaxTopMargins(int pos, int neg); 155 void setMaxBottomMargins(int pos, int neg); 156 157 void initMaxMarginValues() 158 { 159 if (m_maxMargin) { 160 m_maxMargin->m_topPos = MaxMargin::topPosDefault(this); 161 m_maxMargin->m_topNeg = MaxMargin::topNegDefault(this); 162 m_maxMargin->m_bottomPos = MaxMargin::bottomPosDefault(this); 163 m_maxMargin->m_bottomNeg = MaxMargin::bottomNegDefault(this); 164 } 165 } 166 167 virtual void layout(); 168 169 void layoutPositionedObjects(bool relayoutChildren); 170 171 virtual void paint(PaintInfo&, int tx, int ty); 172 virtual void paintObject(PaintInfo&, int tx, int ty); 173 174 int rightRelOffset(int y, int fixedOffset, bool applyTextIndent = true, int* heightRemaining = 0) const; 175 int leftRelOffset(int y, int fixedOffset, bool applyTextIndent = true, int* heightRemaining = 0) const; 176 177 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction); 178 179 virtual void calcPrefWidths(); 180 181 virtual int firstLineBoxBaseline() const; 182 virtual int lastLineBoxBaseline() const; 183 184 virtual void updateFirstLetter(); 185 186 virtual void updateHitTestResult(HitTestResult&, const IntPoint&); 187 188 // Delay update scrollbar until finishDelayRepaint() will be 189 // called. This function is used when a flexbox is laying out its 190 // descendant. If multiple calls are made to startDelayRepaint(), 191 // finishDelayRepaint() will do nothing until finishDelayRepaint() 192 // is called the same number of times. 193 static void startDelayUpdateScrollInfo(); 194 static void finishDelayUpdateScrollInfo(); 195 196 virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle); 197 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle); 198 199 virtual bool hasLineIfEmpty() const; 200 bool layoutOnlyPositionedObjects(); 201 202 private: 203 virtual RenderObjectChildList* virtualChildren() { return children(); } 204 virtual const RenderObjectChildList* virtualChildren() const { return children(); } 205 206 virtual const char* renderName() const; 207 208 virtual bool isRenderBlock() const { return true; } 209 virtual bool isBlockFlow() const { return (!isInline() || isReplaced()) && !isTable(); } 210 virtual bool isInlineBlockOrInlineTable() const { return isInline() && isReplaced(); } 211 212 void makeChildrenNonInline(RenderObject* insertionPoint = 0); 213 virtual void removeLeftoverAnonymousBlock(RenderBlock* child); 214 215 virtual void dirtyLinesFromChangedChild(RenderObject* child) { m_lineBoxes.dirtyLinesFromChangedChild(this, child); } 216 217 virtual bool isSelfCollapsingBlock() const; 218 219 virtual int maxTopMargin(bool positive) const { return positive ? maxTopPosMargin() : maxTopNegMargin(); } 220 virtual int maxBottomMargin(bool positive) const { return positive ? maxBottomPosMargin() : maxBottomNegMargin(); } 221 222 virtual void repaintOverhangingFloats(bool paintAllDescendants); 223 224 void layoutBlockChildren(bool relayoutChildren, int& maxFloatBottom); 225 void layoutInlineChildren(bool relayoutChildren, int& repaintTop, int& repaintBottom); 226 227 virtual void positionListMarker() { } 228 229 virtual void borderFitAdjust(int& x, int& w) const; // Shrink the box in which the border paints if border-fit is set. 230 231 virtual void updateBeforeAfterContent(PseudoId); 232 233 virtual RootInlineBox* createRootInlineBox(); // Subclassed by SVG and Ruby. 234 235 // Called to lay out the legend for a fieldset. 236 virtual RenderObject* layoutLegend(bool /*relayoutChildren*/) { return 0; } 237 238 struct FloatWithRect { 239 FloatWithRect(RenderBox* f) 240 : object(f) 241 , rect(IntRect(f->x() - f->marginLeft(), f->y() - f->marginTop(), f->width() + f->marginLeft() + f->marginRight(), f->height() + f->marginTop() + f->marginBottom())) 242 , everHadLayout(f->m_everHadLayout) 243 { 244 } 245 246 RenderBox* object; 247 IntRect rect; 248 bool everHadLayout; 249 }; 250 251 // The following functions' implementations are in RenderBlockLineLayout.cpp. 252 void bidiReorderLine(InlineBidiResolver&, const InlineIterator& end, bool previousLineBrokeCleanly); 253 RootInlineBox* determineStartPosition(bool& firstLine, bool& fullLayout, bool& previousLineBrokeCleanly, 254 InlineBidiResolver&, Vector<FloatWithRect>& floats, unsigned& numCleanFloats); 255 RootInlineBox* determineEndPosition(RootInlineBox* startBox, InlineIterator& cleanLineStart, 256 BidiStatus& cleanLineBidiStatus, 257 int& yPos); 258 bool matchedEndLine(const InlineBidiResolver&, const InlineIterator& endLineStart, const BidiStatus& endLineStatus, 259 RootInlineBox*& endLine, int& endYPos, int& repaintBottom, int& repaintTop); 260 261 void skipTrailingWhitespace(InlineIterator&, bool isLineEmpty, bool previousLineBrokeCleanly); 262 int skipLeadingWhitespace(InlineBidiResolver&, bool firstLine, bool isLineEmpty, bool previousLineBrokeCleanly); 263 void fitBelowFloats(int widthToFit, bool firstLine, int& availableWidth); 264 InlineIterator findNextLineBreak(InlineBidiResolver&, bool firstLine, bool& isLineEmpty, bool& previousLineBrokeCleanly, EClear* clear = 0); 265 RootInlineBox* constructLine(unsigned runCount, BidiRun* firstRun, BidiRun* lastRun, bool firstLine, bool lastLine, RenderObject* endObject); 266 InlineFlowBox* createLineBoxes(RenderObject*, bool firstLine); 267 void computeHorizontalPositionsForLine(RootInlineBox*, bool firstLine, BidiRun* firstRun, BidiRun* trailingSpaceRun, bool reachedEnd); 268 void computeVerticalPositionsForLine(RootInlineBox*, BidiRun*); 269 void deleteEllipsisLineBoxes(); 270 void checkLinesForTextOverflow(); 271 void addOverflowFromInlineChildren(); 272 // End of functions defined in RenderBlockLineLayout.cpp. 273 274 void addOverflowFromBlockChildren(); 275 void addOverflowFromFloats(); 276 277 void paintFloats(PaintInfo&, int tx, int ty, bool preservePhase = false); 278 void paintContents(PaintInfo&, int tx, int ty); 279 void paintColumnContents(PaintInfo&, int tx, int ty, bool paintFloats = false); 280 void paintColumnRules(PaintInfo&, int tx, int ty); 281 void paintChildren(PaintInfo&, int tx, int ty); 282 void paintEllipsisBoxes(PaintInfo&, int tx, int ty); 283 void paintSelection(PaintInfo&, int tx, int ty); 284 void paintCaret(PaintInfo&, int tx, int ty, CaretType); 285 286 void insertFloatingObject(RenderBox*); 287 void removeFloatingObject(RenderBox*); 288 289 // Called from lineWidth, to position the floats added in the last line. 290 // Returns ture if and only if it has positioned any floats. 291 bool positionNewFloats(); 292 void clearFloats(); 293 int getClearDelta(RenderBox* child, int yPos); 294 295 virtual bool avoidsFloats() const; 296 297 bool hasOverhangingFloats() { return parent() && !hasColumns() && floatBottom() > height(); } 298 void addIntrudingFloats(RenderBlock* prev, int xoffset, int yoffset); 299 int addOverhangingFloats(RenderBlock* child, int xoffset, int yoffset, bool makeChildPaintOtherFloats); 300 301 int nextFloatBottomBelow(int) const; 302 int floatBottom() const; 303 inline int leftBottom(); 304 inline int rightBottom(); 305 306 int rightOffset() const; 307 int leftOffset() const; 308 virtual bool hitTestColumns(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction); 309 virtual bool hitTestContents(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction); 310 311 virtual bool isPointInOverflowControl(HitTestResult&, int x, int y, int tx, int ty); 312 313 void calcInlinePrefWidths(); 314 void calcBlockPrefWidths(); 315 316 // Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline 317 // children. 318 virtual RenderBlock* firstLineBlock() const; 319 bool inRootBlockContext() const; 320 321 virtual IntRect rectWithOutlineForRepaint(RenderBoxModelObject* repaintContainer, int outlineWidth); 322 virtual RenderStyle* outlineStyleForRepaint() const; 323 324 virtual RenderObject* hoverAncestor() const; 325 virtual void updateDragState(bool dragOn); 326 virtual void childBecameNonInline(RenderObject* child); 327 328 virtual IntRect selectionRectForRepaint(RenderBoxModelObject* repaintContainer, bool /*clipToVisibleContent*/) 329 { 330 return selectionGapRectsForRepaint(repaintContainer); 331 } 332 virtual bool shouldPaintSelectionGaps() const; 333 bool isSelectionRoot() const; 334 GapRects fillSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, 335 int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* = 0); 336 GapRects fillInlineSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, 337 int& lastTop, int& lastLeft, int& lastRight, const PaintInfo*); 338 GapRects fillBlockSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, 339 int& lastTop, int& lastLeft, int& lastRight, const PaintInfo*); 340 IntRect fillVerticalSelectionGap(int lastTop, int lastLeft, int lastRight, int bottomY, RenderBlock* rootBlock, 341 int blockX, int blockY, const PaintInfo*); 342 int leftSelectionOffset(RenderBlock* rootBlock, int y); 343 int rightSelectionOffset(RenderBlock* rootBlock, int y); 344 345 virtual void absoluteRects(Vector<IntRect>&, int tx, int ty); 346 virtual void absoluteQuads(Vector<FloatQuad>&); 347 348 int desiredColumnWidth() const; 349 unsigned desiredColumnCount() const; 350 #if PLATFORM(ANDROID) 351 public: 352 #endif 353 Vector<IntRect>* columnRects() const; 354 #if PLATFORM(ANDROID) 355 private: 356 #endif 357 void setDesiredColumnCountAndWidth(int count, int width); 358 #if PLATFORM(ANDROID) 359 public: 360 #endif 361 int columnGap() const; 362 #if PLATFORM(ANDROID) 363 private: 364 #endif 365 366 void paintContinuationOutlines(PaintInfo&, int tx, int ty); 367 368 virtual IntRect localCaretRect(InlineBox*, int caretOffset, int* extraWidthToEndOfLine = 0); 369 370 virtual void addFocusRingRects(Vector<IntRect>&, int tx, int ty); 371 372 void adjustPointToColumnContents(IntPoint&) const; 373 void adjustForBorderFit(int x, int& left, int& right) const; // Helper function for borderFitAdjust 374 375 void markLinesDirtyInVerticalRange(int top, int bottom, RootInlineBox* highest = 0); 376 377 void newLine(EClear); 378 379 Position positionForBox(InlineBox*, bool start = true) const; 380 Position positionForRenderer(RenderObject*, bool start = true) const; 381 VisiblePosition positionForPointWithInlineChildren(const IntPoint&); 382 383 // Adjust tx and ty from painting offsets to the local coords of this renderer 384 void offsetForContents(int& tx, int& ty) const; 385 386 void calcColumnWidth(); 387 int layoutColumns(int endOfContent = -1, int requestedColumnHeight = -1); 388 389 bool expandsToEncloseOverhangingFloats() const; 390 391 void updateScrollInfoAfterLayout(); 392 393 struct FloatingObject : Noncopyable { 394 enum Type { 395 FloatLeft, 396 FloatRight 397 }; 398 399 FloatingObject(Type type) 400 : m_renderer(0) 401 , m_top(0) 402 , m_bottom(0) 403 , m_left(0) 404 , m_width(0) 405 , m_type(type) 406 , m_shouldPaint(true) 407 , m_isDescendant(false) 408 { 409 } 410 411 Type type() { return static_cast<Type>(m_type); } 412 413 RenderBox* m_renderer; 414 int m_top; 415 int m_bottom; 416 int m_left; 417 int m_width; 418 unsigned m_type : 1; // Type (left or right aligned) 419 bool m_shouldPaint : 1; 420 bool m_isDescendant : 1; 421 }; 422 423 class MarginInfo { 424 // Collapsing flags for whether we can collapse our margins with our children's margins. 425 bool m_canCollapseWithChildren : 1; 426 bool m_canCollapseTopWithChildren : 1; 427 bool m_canCollapseBottomWithChildren : 1; 428 429 // Whether or not we are a quirky container, i.e., do we collapse away top and bottom 430 // margins in our container. Table cells and the body are the common examples. We 431 // also have a custom style property for Safari RSS to deal with TypePad blog articles. 432 bool m_quirkContainer : 1; 433 434 // This flag tracks whether we are still looking at child margins that can all collapse together at the beginning of a block. 435 // They may or may not collapse with the top margin of the block (|m_canCollapseTopWithChildren| tells us that), but they will 436 // always be collapsing with one another. This variable can remain set to true through multiple iterations 437 // as long as we keep encountering self-collapsing blocks. 438 bool m_atTopOfBlock : 1; 439 440 // This flag is set when we know we're examining bottom margins and we know we're at the bottom of the block. 441 bool m_atBottomOfBlock : 1; 442 443 // These variables are used to detect quirky margins that we need to collapse away (in table cells 444 // and in the body element). 445 bool m_topQuirk : 1; 446 bool m_bottomQuirk : 1; 447 bool m_determinedTopQuirk : 1; 448 449 // These flags track the previous maximal positive and negative margins. 450 int m_posMargin; 451 int m_negMargin; 452 453 public: 454 MarginInfo(RenderBlock* b, int top, int bottom); 455 456 void setAtTopOfBlock(bool b) { m_atTopOfBlock = b; } 457 void setAtBottomOfBlock(bool b) { m_atBottomOfBlock = b; } 458 void clearMargin() { m_posMargin = m_negMargin = 0; } 459 void setTopQuirk(bool b) { m_topQuirk = b; } 460 void setBottomQuirk(bool b) { m_bottomQuirk = b; } 461 void setDeterminedTopQuirk(bool b) { m_determinedTopQuirk = b; } 462 void setPosMargin(int p) { m_posMargin = p; } 463 void setNegMargin(int n) { m_negMargin = n; } 464 void setPosMarginIfLarger(int p) { if (p > m_posMargin) m_posMargin = p; } 465 void setNegMarginIfLarger(int n) { if (n > m_negMargin) m_negMargin = n; } 466 467 void setMargin(int p, int n) { m_posMargin = p; m_negMargin = n; } 468 469 bool atTopOfBlock() const { return m_atTopOfBlock; } 470 bool canCollapseWithTop() const { return m_atTopOfBlock && m_canCollapseTopWithChildren; } 471 bool canCollapseWithBottom() const { return m_atBottomOfBlock && m_canCollapseBottomWithChildren; } 472 bool canCollapseTopWithChildren() const { return m_canCollapseTopWithChildren; } 473 bool canCollapseBottomWithChildren() const { return m_canCollapseBottomWithChildren; } 474 bool quirkContainer() const { return m_quirkContainer; } 475 bool determinedTopQuirk() const { return m_determinedTopQuirk; } 476 bool topQuirk() const { return m_topQuirk; } 477 bool bottomQuirk() const { return m_bottomQuirk; } 478 int posMargin() const { return m_posMargin; } 479 int negMargin() const { return m_negMargin; } 480 int margin() const { return m_posMargin - m_negMargin; } 481 }; 482 483 void layoutBlockChild(RenderBox* child, MarginInfo&, int& previousFloatBottom, int& maxFloatBottom); 484 void adjustPositionedBlock(RenderBox* child, const MarginInfo&); 485 void adjustFloatingBlock(const MarginInfo&); 486 bool handleSpecialChild(RenderBox* child, const MarginInfo&); 487 bool handleFloatingChild(RenderBox* child, const MarginInfo&); 488 bool handlePositionedChild(RenderBox* child, const MarginInfo&); 489 bool handleRunInChild(RenderBox* child); 490 int collapseMargins(RenderBox* child, MarginInfo&); 491 int clearFloatsIfNeeded(RenderBox* child, MarginInfo&, int oldTopPosMargin, int oldTopNegMargin, int yPos); 492 int estimateVerticalPosition(RenderBox* child, const MarginInfo&); 493 void determineHorizontalPosition(RenderBox* child); 494 void handleBottomOfBlock(int top, int bottom, MarginInfo&); 495 void setCollapsedBottomMargin(const MarginInfo&); 496 // End helper functions and structs used by layoutBlockChildren. 497 498 typedef ListHashSet<RenderBox*>::const_iterator Iterator; 499 DeprecatedPtrList<FloatingObject>* m_floatingObjects; 500 ListHashSet<RenderBox*>* m_positionedObjects; 501 502 // An inline can be split with blocks occurring in between the inline content. 503 // When this occurs we need a pointer to our next object. We can basically be 504 // split into a sequence of inlines and blocks. The continuation will either be 505 // an anonymous block (that houses other blocks) or it will be an inline flow. 506 RenderInline* m_inlineContinuation; 507 508 // Allocated only when some of these fields have non-default values 509 struct MaxMargin : Noncopyable { 510 MaxMargin(const RenderBlock* o) 511 : m_topPos(topPosDefault(o)) 512 , m_topNeg(topNegDefault(o)) 513 , m_bottomPos(bottomPosDefault(o)) 514 , m_bottomNeg(bottomNegDefault(o)) 515 { 516 } 517 518 static int topPosDefault(const RenderBlock* o) { return o->marginTop() > 0 ? o->marginTop() : 0; } 519 static int topNegDefault(const RenderBlock* o) { return o->marginTop() < 0 ? -o->marginTop() : 0; } 520 static int bottomPosDefault(const RenderBlock* o) { return o->marginBottom() > 0 ? o->marginBottom() : 0; } 521 static int bottomNegDefault(const RenderBlock* o) { return o->marginBottom() < 0 ? -o->marginBottom() : 0; } 522 523 int m_topPos; 524 int m_topNeg; 525 int m_bottomPos; 526 int m_bottomNeg; 527 }; 528 529 MaxMargin* m_maxMargin; 530 531 RenderObjectChildList m_children; 532 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>. 533 534 mutable int m_lineHeight; 535 536 // RenderRubyBase objects need to be able to split and merge, moving their children around 537 // (calling moveChildTo, moveAllChildrenTo, and makeChildrenNonInline). 538 friend class RenderRubyBase; 539 }; 540 541 inline RenderBlock* toRenderBlock(RenderObject* object) 542 { 543 ASSERT(!object || object->isRenderBlock()); 544 return static_cast<RenderBlock*>(object); 545 } 546 547 inline const RenderBlock* toRenderBlock(const RenderObject* object) 548 { 549 ASSERT(!object || object->isRenderBlock()); 550 return static_cast<const RenderBlock*>(object); 551 } 552 553 // This will catch anyone doing an unnecessary cast. 554 void toRenderBlock(const RenderBlock*); 555 556 } // namespace WebCore 557 558 #endif // RenderBlock_h 559