1/* 2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org) 3 * (C) 1999 Antti Koivisto (koivisto@kde.org) 4 * Copyright (C) 2003, 2006, 2007 Apple Inc. All rights reserved. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Library General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Library General Public License for more details. 15 * 16 * You should have received a copy of the GNU Library General Public License 17 * along with this library; see the file COPYING.LIB. If not, write to 18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA. 20 * 21 */ 22 23#ifndef RenderBox_h 24#define RenderBox_h 25 26#include "RenderBoxModelObject.h" 27#include "RenderOverflow.h" 28#include "ScrollTypes.h" 29#if ENABLE(CSS_SHAPES) 30#include "ShapeOutsideInfo.h" 31#endif 32 33namespace WebCore { 34 35class RenderBoxRegionInfo; 36class RenderRegion; 37struct PaintInfo; 38 39enum SizeType { MainOrPreferredSize, MinSize, MaxSize }; 40enum AvailableLogicalHeightType { ExcludeMarginBorderPadding, IncludeMarginBorderPadding }; 41enum OverlayScrollbarSizeRelevancy { IgnoreOverlayScrollbarSize, IncludeOverlayScrollbarSize }; 42 43enum ShouldComputePreferred { ComputeActual, ComputePreferred }; 44 45class RenderBox : public RenderBoxModelObject { 46public: 47 explicit RenderBox(ContainerNode*); 48 virtual ~RenderBox(); 49 50 // hasAutoZIndex only returns true if the element is positioned or a flex-item since 51 // position:static elements that are not flex-items get their z-index coerced to auto. 52 virtual bool requiresLayer() const OVERRIDE { return isRoot() || isPositioned() || createsGroup() || hasClipPath() || hasOverflowClip() || hasTransform() || hasHiddenBackface() || hasReflection() || style()->specifiesColumns() || !style()->hasAutoZIndex() || isFloatingWithShapeOutside(); } 53 54 virtual bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const OVERRIDE; 55 56 // Use this with caution! No type checking is done! 57 RenderBox* firstChildBox() const; 58 RenderBox* lastChildBox() const; 59 60 LayoutUnit x() const { return m_frameRect.x(); } 61 LayoutUnit y() const { return m_frameRect.y(); } 62 LayoutUnit width() const { return m_frameRect.width(); } 63 LayoutUnit height() const { return m_frameRect.height(); } 64 65 int pixelSnappedWidth() const { return m_frameRect.pixelSnappedWidth(); } 66 int pixelSnappedHeight() const { return m_frameRect.pixelSnappedHeight(); } 67 68 // These represent your location relative to your container as a physical offset. 69 // In layout related methods you almost always want the logical location (e.g. x() and y()). 70 LayoutUnit top() const { return topLeftLocation().y(); } 71 LayoutUnit left() const { return topLeftLocation().x(); } 72 73 void setX(LayoutUnit x) { m_frameRect.setX(x); } 74 void setY(LayoutUnit y) { m_frameRect.setY(y); } 75 void setWidth(LayoutUnit width) { m_frameRect.setWidth(width); } 76 void setHeight(LayoutUnit height) { m_frameRect.setHeight(height); } 77 78 LayoutUnit logicalLeft() const { return style()->isHorizontalWritingMode() ? x() : y(); } 79 LayoutUnit logicalRight() const { return logicalLeft() + logicalWidth(); } 80 LayoutUnit logicalTop() const { return style()->isHorizontalWritingMode() ? y() : x(); } 81 LayoutUnit logicalBottom() const { return logicalTop() + logicalHeight(); } 82 LayoutUnit logicalWidth() const { return style()->isHorizontalWritingMode() ? width() : height(); } 83 LayoutUnit logicalHeight() const { return style()->isHorizontalWritingMode() ? height() : width(); } 84 85 LayoutUnit constrainLogicalWidthInRegionByMinMax(LayoutUnit, LayoutUnit, RenderBlock*, RenderRegion* = 0) const; 86 LayoutUnit constrainLogicalHeightByMinMax(LayoutUnit) const; 87 LayoutUnit constrainContentBoxLogicalHeightByMinMax(LayoutUnit) const; 88 89 int pixelSnappedLogicalHeight() const { return style()->isHorizontalWritingMode() ? pixelSnappedHeight() : pixelSnappedWidth(); } 90 int pixelSnappedLogicalWidth() const { return style()->isHorizontalWritingMode() ? pixelSnappedWidth() : pixelSnappedHeight(); } 91 92 void setLogicalLeft(LayoutUnit left) 93 { 94 if (style()->isHorizontalWritingMode()) 95 setX(left); 96 else 97 setY(left); 98 } 99 void setLogicalTop(LayoutUnit top) 100 { 101 if (style()->isHorizontalWritingMode()) 102 setY(top); 103 else 104 setX(top); 105 } 106 void setLogicalLocation(const LayoutPoint& location) 107 { 108 if (style()->isHorizontalWritingMode()) 109 setLocation(location); 110 else 111 setLocation(location.transposedPoint()); 112 } 113 void setLogicalWidth(LayoutUnit size) 114 { 115 if (style()->isHorizontalWritingMode()) 116 setWidth(size); 117 else 118 setHeight(size); 119 } 120 void setLogicalHeight(LayoutUnit size) 121 { 122 if (style()->isHorizontalWritingMode()) 123 setHeight(size); 124 else 125 setWidth(size); 126 } 127 void setLogicalSize(const LayoutSize& size) 128 { 129 if (style()->isHorizontalWritingMode()) 130 setSize(size); 131 else 132 setSize(size.transposedSize()); 133 } 134 135 LayoutPoint location() const { return m_frameRect.location(); } 136 LayoutSize locationOffset() const { return LayoutSize(x(), y()); } 137 LayoutSize size() const { return m_frameRect.size(); } 138 IntSize pixelSnappedSize() const { return m_frameRect.pixelSnappedSize(); } 139 140 void setLocation(const LayoutPoint& location) { m_frameRect.setLocation(location); } 141 142 void setSize(const LayoutSize& size) { m_frameRect.setSize(size); } 143 void move(LayoutUnit dx, LayoutUnit dy) { m_frameRect.move(dx, dy); } 144 145 LayoutRect frameRect() const { return m_frameRect; } 146 IntRect pixelSnappedFrameRect() const { return pixelSnappedIntRect(m_frameRect); } 147 void setFrameRect(const LayoutRect& rect) { m_frameRect = rect; } 148 149 LayoutRect borderBoxRect() const { return LayoutRect(LayoutPoint(), size()); } 150 LayoutRect paddingBoxRect() const { return LayoutRect(borderLeft(), borderTop(), contentWidth() + paddingLeft() + paddingRight(), contentHeight() + paddingTop() + paddingBottom()); } 151 IntRect pixelSnappedBorderBoxRect() const { return IntRect(IntPoint(), m_frameRect.pixelSnappedSize()); } 152 virtual IntRect borderBoundingBox() const { return pixelSnappedBorderBoxRect(); } 153 154 // The content area of the box (excludes padding - and intrinsic padding for table cells, etc... - and border). 155 LayoutRect contentBoxRect() const { return LayoutRect(borderLeft() + paddingLeft(), borderTop() + paddingTop(), contentWidth(), contentHeight()); } 156 // The content box in absolute coords. Ignores transforms. 157 IntRect absoluteContentBox() const; 158 // The content box converted to absolute coords (taking transforms into account). 159 FloatQuad absoluteContentQuad() const; 160 161 // This returns the content area of the box (excluding padding and border). The only difference with contentBoxRect is that computedCSSContentBoxRect 162 // does include the intrinsic padding in the content box as this is what some callers expect (like getComputedStyle). 163 LayoutRect computedCSSContentBoxRect() const { return LayoutRect(borderLeft() + computedCSSPaddingLeft(), borderTop() + computedCSSPaddingTop(), clientWidth() - computedCSSPaddingLeft() - computedCSSPaddingRight(), clientHeight() - computedCSSPaddingTop() - computedCSSPaddingBottom()); } 164 165 // Bounds of the outline box in absolute coords. Respects transforms 166 virtual LayoutRect outlineBoundsForRepaint(const RenderLayerModelObject* /*repaintContainer*/, const RenderGeometryMap*) const OVERRIDE; 167 virtual void addFocusRingRects(Vector<IntRect>&, const LayoutPoint&); 168 169 // Use this with caution! No type checking is done! 170 RenderBox* previousSiblingBox() const; 171 RenderBox* nextSiblingBox() const; 172 RenderBox* parentBox() const; 173 174 // Visual and layout overflow are in the coordinate space of the box. This means that they aren't purely physical directions. 175 // For horizontal-tb and vertical-lr they will match physical directions, but for horizontal-bt and vertical-rl, the top/bottom and left/right 176 // respectively are flipped when compared to their physical counterparts. For example minX is on the left in vertical-lr, 177 // but it is on the right in vertical-rl. 178 LayoutRect layoutOverflowRect() const { return m_overflow ? m_overflow->layoutOverflowRect() : clientBoxRect(); } 179 LayoutUnit logicalLeftLayoutOverflow() const { return style()->isHorizontalWritingMode() ? layoutOverflowRect().x() : layoutOverflowRect().y(); } 180 LayoutUnit logicalRightLayoutOverflow() const { return style()->isHorizontalWritingMode() ? layoutOverflowRect().maxX() : layoutOverflowRect().maxY(); } 181 182 virtual LayoutRect visualOverflowRect() const { return m_overflow ? m_overflow->visualOverflowRect() : borderBoxRect(); } 183 LayoutUnit logicalLeftVisualOverflow() const { return style()->isHorizontalWritingMode() ? visualOverflowRect().x() : visualOverflowRect().y(); } 184 LayoutUnit logicalRightVisualOverflow() const { return style()->isHorizontalWritingMode() ? visualOverflowRect().maxX() : visualOverflowRect().maxY(); } 185 186 LayoutRect overflowRectForPaintRejection() const; 187 188 void addLayoutOverflow(const LayoutRect&); 189 void addVisualOverflow(const LayoutRect&); 190 191 void addVisualEffectOverflow(); 192 void addOverflowFromChild(RenderBox* child) { addOverflowFromChild(child, child->locationOffset()); } 193 void addOverflowFromChild(RenderBox* child, const LayoutSize& delta); 194 195 void updateLayerTransform(); 196 197 LayoutUnit contentWidth() const { return clientWidth() - paddingLeft() - paddingRight(); } 198 LayoutUnit contentHeight() const { return clientHeight() - paddingTop() - paddingBottom(); } 199 LayoutUnit contentLogicalWidth() const { return style()->isHorizontalWritingMode() ? contentWidth() : contentHeight(); } 200 LayoutUnit contentLogicalHeight() const { return style()->isHorizontalWritingMode() ? contentHeight() : contentWidth(); } 201 202 // IE extensions. Used to calculate offsetWidth/Height. Overridden by inlines (RenderFlow) 203 // to return the remaining width on a given line (and the height of a single line). 204 virtual LayoutUnit offsetWidth() const { return width(); } 205 virtual LayoutUnit offsetHeight() const { return height(); } 206 207 virtual int pixelSnappedOffsetWidth() const OVERRIDE; 208 virtual int pixelSnappedOffsetHeight() const OVERRIDE; 209 210 // More IE extensions. clientWidth and clientHeight represent the interior of an object 211 // excluding border and scrollbar. clientLeft/Top are just the borderLeftWidth and borderTopWidth. 212 LayoutUnit clientLeft() const { return borderLeft(); } 213 LayoutUnit clientTop() const { return borderTop(); } 214 LayoutUnit clientWidth() const; 215 LayoutUnit clientHeight() const; 216 LayoutUnit clientLogicalWidth() const { return style()->isHorizontalWritingMode() ? clientWidth() : clientHeight(); } 217 LayoutUnit clientLogicalHeight() const { return style()->isHorizontalWritingMode() ? clientHeight() : clientWidth(); } 218 LayoutUnit clientLogicalBottom() const { return borderBefore() + clientLogicalHeight(); } 219 LayoutRect clientBoxRect() const { return LayoutRect(clientLeft(), clientTop(), clientWidth(), clientHeight()); } 220 221 int pixelSnappedClientWidth() const; 222 int pixelSnappedClientHeight() const; 223 224 // scrollWidth/scrollHeight will be the same as clientWidth/clientHeight unless the 225 // object has overflow:hidden/scroll/auto specified and also has overflow. 226 // scrollLeft/Top return the current scroll position. These methods are virtual so that objects like 227 // textareas can scroll shadow content (but pretend that they are the objects that are 228 // scrolling). 229 virtual int scrollLeft() const; 230 virtual int scrollTop() const; 231 virtual int scrollWidth() const; 232 virtual int scrollHeight() const; 233 virtual void setScrollLeft(int); 234 virtual void setScrollTop(int); 235 236 virtual LayoutUnit marginTop() const OVERRIDE { return m_marginBox.top(); } 237 virtual LayoutUnit marginBottom() const OVERRIDE { return m_marginBox.bottom(); } 238 virtual LayoutUnit marginLeft() const OVERRIDE { return m_marginBox.left(); } 239 virtual LayoutUnit marginRight() const OVERRIDE { return m_marginBox.right(); } 240 void setMarginTop(LayoutUnit margin) { m_marginBox.setTop(margin); } 241 void setMarginBottom(LayoutUnit margin) { m_marginBox.setBottom(margin); } 242 void setMarginLeft(LayoutUnit margin) { m_marginBox.setLeft(margin); } 243 void setMarginRight(LayoutUnit margin) { m_marginBox.setRight(margin); } 244 245 virtual LayoutUnit marginLogicalLeft() const { return m_marginBox.logicalLeft(style()->writingMode()); } 246 virtual LayoutUnit marginLogicalRight() const { return m_marginBox.logicalRight(style()->writingMode()); } 247 248 virtual LayoutUnit marginBefore(const RenderStyle* overrideStyle = 0) const OVERRIDE { return m_marginBox.before((overrideStyle ? overrideStyle : style())->writingMode()); } 249 virtual LayoutUnit marginAfter(const RenderStyle* overrideStyle = 0) const OVERRIDE { return m_marginBox.after((overrideStyle ? overrideStyle : style())->writingMode()); } 250 virtual LayoutUnit marginStart(const RenderStyle* overrideStyle = 0) const OVERRIDE 251 { 252 const RenderStyle* styleToUse = overrideStyle ? overrideStyle : style(); 253 return m_marginBox.start(styleToUse->writingMode(), styleToUse->direction()); 254 } 255 virtual LayoutUnit marginEnd(const RenderStyle* overrideStyle = 0) const OVERRIDE 256 { 257 const RenderStyle* styleToUse = overrideStyle ? overrideStyle : style(); 258 return m_marginBox.end(styleToUse->writingMode(), styleToUse->direction()); 259 } 260 void setMarginBefore(LayoutUnit value, const RenderStyle* overrideStyle = 0) { m_marginBox.setBefore((overrideStyle ? overrideStyle : style())->writingMode(), value); } 261 void setMarginAfter(LayoutUnit value, const RenderStyle* overrideStyle = 0) { m_marginBox.setAfter((overrideStyle ? overrideStyle : style())->writingMode(), value); } 262 void setMarginStart(LayoutUnit value, const RenderStyle* overrideStyle = 0) 263 { 264 const RenderStyle* styleToUse = overrideStyle ? overrideStyle : style(); 265 m_marginBox.setStart(styleToUse->writingMode(), styleToUse->direction(), value); 266 } 267 void setMarginEnd(LayoutUnit value, const RenderStyle* overrideStyle = 0) 268 { 269 const RenderStyle* styleToUse = overrideStyle ? overrideStyle : style(); 270 m_marginBox.setEnd(styleToUse->writingMode(), styleToUse->direction(), value); 271 } 272 273 // The following five functions are used to implement collapsing margins. 274 // All objects know their maximal positive and negative margins. The 275 // formula for computing a collapsed margin is |maxPosMargin| - |maxNegmargin|. 276 // For a non-collapsing box, such as a leaf element, this formula will simply return 277 // the margin of the element. Blocks override the maxMarginBefore and maxMarginAfter 278 // methods. 279 enum MarginSign { PositiveMargin, NegativeMargin }; 280 virtual bool isSelfCollapsingBlock() const { return false; } 281 virtual LayoutUnit collapsedMarginBefore() const { return marginBefore(); } 282 virtual LayoutUnit collapsedMarginAfter() const { return marginAfter(); } 283 284 virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const; 285 virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const; 286 287 LayoutRect reflectionBox() const; 288 int reflectionOffset() const; 289 // Given a rect in the object's coordinate space, returns the corresponding rect in the reflection. 290 LayoutRect reflectedRect(const LayoutRect&) const; 291 292 virtual void layout(); 293 virtual void paint(PaintInfo&, const LayoutPoint&); 294 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE; 295 296 virtual LayoutUnit minPreferredLogicalWidth() const; 297 virtual LayoutUnit maxPreferredLogicalWidth() const; 298 299 // FIXME: We should rename these back to overrideLogicalHeight/Width and have them store 300 // the border-box height/width like the regular height/width accessors on RenderBox. 301 // Right now, these are different than contentHeight/contentWidth because they still 302 // include the scrollbar height/width. 303 LayoutUnit overrideLogicalContentWidth() const; 304 LayoutUnit overrideLogicalContentHeight() const; 305 bool hasOverrideHeight() const; 306 bool hasOverrideWidth() const; 307 void setOverrideLogicalContentHeight(LayoutUnit); 308 void setOverrideLogicalContentWidth(LayoutUnit); 309 void clearOverrideSize(); 310 void clearOverrideLogicalContentHeight(); 311 void clearOverrideLogicalContentWidth(); 312 313 LayoutUnit overrideContainingBlockContentLogicalWidth() const; 314 LayoutUnit overrideContainingBlockContentLogicalHeight() const; 315 bool hasOverrideContainingBlockLogicalWidth() const; 316 bool hasOverrideContainingBlockLogicalHeight() const; 317 void setOverrideContainingBlockContentLogicalWidth(LayoutUnit); 318 void setOverrideContainingBlockContentLogicalHeight(LayoutUnit); 319 void clearContainingBlockOverrideSize(); 320 void clearOverrideContainingBlockContentLogicalHeight(); 321 322 virtual LayoutSize offsetFromContainer(RenderObject*, const LayoutPoint&, bool* offsetDependsOnPoint = 0) const; 323 324 LayoutUnit adjustBorderBoxLogicalWidthForBoxSizing(LayoutUnit width) const; 325 LayoutUnit adjustBorderBoxLogicalHeightForBoxSizing(LayoutUnit height) const; 326 LayoutUnit adjustContentBoxLogicalWidthForBoxSizing(LayoutUnit width) const; 327 LayoutUnit adjustContentBoxLogicalHeightForBoxSizing(LayoutUnit height) const; 328 329 struct ComputedMarginValues { 330 ComputedMarginValues() 331 : m_before(0) 332 , m_after(0) 333 , m_start(0) 334 , m_end(0) 335 { 336 } 337 LayoutUnit m_before; 338 LayoutUnit m_after; 339 LayoutUnit m_start; 340 LayoutUnit m_end; 341 }; 342 struct LogicalExtentComputedValues { 343 LogicalExtentComputedValues() 344 : m_extent(0) 345 , m_position(0) 346 { 347 } 348 349 LayoutUnit m_extent; 350 LayoutUnit m_position; 351 ComputedMarginValues m_margins; 352 }; 353 // Resolve auto margins in the inline direction of the containing block so that objects can be pushed to the start, middle or end 354 // of the containing block. 355 void computeInlineDirectionMargins(RenderBlock* containingBlock, LayoutUnit containerWidth, LayoutUnit childWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const; 356 357 // Used to resolve margins in the containing block's block-flow direction. 358 void computeBlockDirectionMargins(const RenderBlock* containingBlock, LayoutUnit& marginBefore, LayoutUnit& marginAfter) const; 359 void computeAndSetBlockDirectionMargins(const RenderBlock* containingBlock); 360 361 enum RenderBoxRegionInfoFlags { CacheRenderBoxRegionInfo, DoNotCacheRenderBoxRegionInfo }; 362 LayoutRect borderBoxRectInRegion(RenderRegion*, RenderBoxRegionInfoFlags = CacheRenderBoxRegionInfo) const; 363 void clearRenderBoxRegionInfo(); 364 virtual LayoutUnit offsetFromLogicalTopOfFirstPage() const; 365 366 void positionLineBox(InlineBox*); 367 368 virtual InlineBox* createInlineBox(); 369 void dirtyLineBoxes(bool fullLayout); 370 371 // For inline replaced elements, this function returns the inline box that owns us. Enables 372 // the replaced RenderObject to quickly determine what line it is contained on and to easily 373 // iterate over structures on the line. 374 InlineBox* inlineBoxWrapper() const { return m_inlineBoxWrapper; } 375 void setInlineBoxWrapper(InlineBox* boxWrapper) { m_inlineBoxWrapper = boxWrapper; } 376 void deleteLineBoxWrapper(); 377 378 virtual LayoutRect clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const OVERRIDE; 379 virtual void computeRectForRepaint(const RenderLayerModelObject* repaintContainer, LayoutRect&, bool fixed = false) const OVERRIDE; 380 void repaintDuringLayoutIfMoved(const LayoutRect&); 381 virtual void repaintOverhangingFloats(bool paintAllDescendants); 382 383 virtual LayoutUnit containingBlockLogicalWidthForContent() const; 384 LayoutUnit containingBlockLogicalHeightForContent(AvailableLogicalHeightType) const; 385 386 LayoutUnit containingBlockLogicalWidthForContentInRegion(RenderRegion*) const; 387 LayoutUnit containingBlockAvailableLineWidthInRegion(RenderRegion*) const; 388 LayoutUnit perpendicularContainingBlockLogicalHeight() const; 389 390 virtual void updateLogicalWidth(); 391 virtual void updateLogicalHeight(); 392 virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const; 393 394 RenderBoxRegionInfo* renderBoxRegionInfo(RenderRegion*, RenderBoxRegionInfoFlags = CacheRenderBoxRegionInfo) const; 395 void computeLogicalWidthInRegion(LogicalExtentComputedValues&, RenderRegion* = 0) const; 396 397 bool stretchesToViewport() const 398 { 399 return document()->inQuirksMode() && style()->logicalHeight().isAuto() && !isFloatingOrOutOfFlowPositioned() && (isRoot() || isBody()) && !document()->shouldDisplaySeamlesslyWithParent() && !isInline(); 400 } 401 402 virtual LayoutSize intrinsicSize() const { return LayoutSize(); } 403 LayoutUnit intrinsicLogicalWidth() const { return style()->isHorizontalWritingMode() ? intrinsicSize().width() : intrinsicSize().height(); } 404 LayoutUnit intrinsicLogicalHeight() const { return style()->isHorizontalWritingMode() ? intrinsicSize().height() : intrinsicSize().width(); } 405 406 // Whether or not the element shrinks to its intrinsic width (rather than filling the width 407 // of a containing block). HTML4 buttons, <select>s, <input>s, legends, and floating/compact elements do this. 408 bool sizesLogicalWidthToFitContent(SizeType) const; 409 410 LayoutUnit shrinkLogicalWidthToAvoidFloats(LayoutUnit childMarginStart, LayoutUnit childMarginEnd, const RenderBlock* cb, RenderRegion*) const; 411 412 LayoutUnit computeLogicalWidthInRegionUsing(SizeType, Length logicalWidth, LayoutUnit availableLogicalWidth, const RenderBlock* containingBlock, RenderRegion*) const; 413 LayoutUnit computeLogicalHeightUsing(const Length& height) const; 414 LayoutUnit computeContentLogicalHeight(const Length& height) const; 415 LayoutUnit computeContentAndScrollbarLogicalHeightUsing(const Length& height) const; 416 LayoutUnit computeReplacedLogicalWidthUsing(Length width) const; 417 LayoutUnit computeReplacedLogicalWidthRespectingMinMaxWidth(LayoutUnit logicalWidth, ShouldComputePreferred = ComputeActual) const; 418 LayoutUnit computeReplacedLogicalHeightUsing(Length height) const; 419 LayoutUnit computeReplacedLogicalHeightRespectingMinMaxHeight(LayoutUnit logicalHeight) const; 420 421 virtual LayoutUnit computeReplacedLogicalWidth(ShouldComputePreferred = ComputeActual) const; 422 virtual LayoutUnit computeReplacedLogicalHeight() const; 423 424 static bool percentageLogicalHeightIsResolvableFromBlock(const RenderBlock* containingBlock, bool outOfFlowPositioned); 425 LayoutUnit computePercentageLogicalHeight(const Length& height) const; 426 427 // Block flows subclass availableWidth/Height to handle multi column layout (shrinking the width/height available to children when laying out.) 428 virtual LayoutUnit availableLogicalWidth() const { return contentLogicalWidth(); } 429 virtual LayoutUnit availableLogicalHeight(AvailableLogicalHeightType) const; 430 LayoutUnit availableLogicalHeightUsing(const Length&, AvailableLogicalHeightType) const; 431 432 // There are a few cases where we need to refer specifically to the available physical width and available physical height. 433 // Relative positioning is one of those cases, since left/top offsets are physical. 434 LayoutUnit availableWidth() const { return style()->isHorizontalWritingMode() ? availableLogicalWidth() : availableLogicalHeight(IncludeMarginBorderPadding); } 435 LayoutUnit availableHeight() const { return style()->isHorizontalWritingMode() ? availableLogicalHeight(IncludeMarginBorderPadding) : availableLogicalWidth(); } 436 437 virtual int verticalScrollbarWidth() const; 438 int horizontalScrollbarHeight() const; 439 int instrinsicScrollbarLogicalWidth() const; 440 int scrollbarLogicalHeight() const { return style()->isHorizontalWritingMode() ? horizontalScrollbarHeight() : verticalScrollbarWidth(); } 441 virtual bool scroll(ScrollDirection, ScrollGranularity, float multiplier = 1, Node** stopNode = 0); 442 virtual bool logicalScroll(ScrollLogicalDirection, ScrollGranularity, float multiplier = 1, Node** stopNode = 0); 443 bool canBeScrolledAndHasScrollableArea() const; 444 virtual bool canBeProgramaticallyScrolled() const; 445 virtual void autoscroll(const IntPoint&); 446 bool canAutoscroll() const; 447 IntSize calculateAutoscrollDirection(const IntPoint& windowPoint) const; 448 static RenderBox* findAutoscrollable(RenderObject*); 449 virtual void stopAutoscroll() { } 450 virtual void panScroll(const IntPoint&); 451 452 bool hasAutoVerticalScrollbar() const { return hasOverflowClip() && (style()->overflowY() == OAUTO || style()->overflowY() == OOVERLAY); } 453 bool hasAutoHorizontalScrollbar() const { return hasOverflowClip() && (style()->overflowX() == OAUTO || style()->overflowX() == OOVERLAY); } 454 bool scrollsOverflow() const { return scrollsOverflowX() || scrollsOverflowY(); } 455 bool scrollsOverflowX() const { return hasOverflowClip() && (style()->overflowX() == OSCROLL || hasAutoHorizontalScrollbar()); } 456 bool scrollsOverflowY() const { return hasOverflowClip() && (style()->overflowY() == OSCROLL || hasAutoVerticalScrollbar()); } 457 bool usesCompositedScrolling() const; 458 459 bool hasUnsplittableScrollingOverflow() const; 460 bool isUnsplittableForPagination() const; 461 462 virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0); 463 464 virtual LayoutRect overflowClipRect(const LayoutPoint& location, RenderRegion*, OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize); 465 LayoutRect clipRect(const LayoutPoint& location, RenderRegion*); 466 virtual bool hasControlClip() const { return false; } 467 virtual LayoutRect controlClipRect(const LayoutPoint&) const { return LayoutRect(); } 468 bool pushContentsClip(PaintInfo&, const LayoutPoint& accumulatedOffset); 469 void popContentsClip(PaintInfo&, PaintPhase originalPhase, const LayoutPoint& accumulatedOffset); 470 471 virtual void paintObject(PaintInfo&, const LayoutPoint&) { ASSERT_NOT_REACHED(); } 472 virtual void paintBoxDecorations(PaintInfo&, const LayoutPoint&); 473 virtual void paintMask(PaintInfo&, const LayoutPoint&); 474 virtual void imageChanged(WrappedImagePtr, const IntRect* = 0); 475 476 // Called when a positioned object moves but doesn't necessarily change size. A simplified layout is attempted 477 // that just updates the object's position. If the size does change, the object remains dirty. 478 bool tryLayoutDoingPositionedMovementOnly() 479 { 480 LayoutUnit oldWidth = width(); 481 updateLogicalWidth(); 482 // If we shrink to fit our width may have changed, so we still need full layout. 483 if (oldWidth != width()) 484 return false; 485 updateLogicalHeight(); 486 return true; 487 } 488 489 LayoutRect maskClipRect(); 490 491 virtual VisiblePosition positionForPoint(const LayoutPoint&); 492 493 void removeFloatingOrPositionedChildFromBlockLists(); 494 495 RenderLayer* enclosingFloatPaintingLayer() const; 496 497 virtual int firstLineBoxBaseline() const { return -1; } 498 virtual int inlineBlockBaseline(LineDirectionMode) const { return -1; } // Returns -1 if we should skip this box when computing the baseline of an inline-block. 499 500 bool shrinkToAvoidFloats() const; 501 virtual bool avoidsFloats() const; 502 503 virtual void markForPaginationRelayoutIfNeeded() { } 504 505 bool isWritingModeRoot() const { return !parent() || parent()->style()->writingMode() != style()->writingMode(); } 506 507 bool isDeprecatedFlexItem() const { return !isInline() && !isFloatingOrOutOfFlowPositioned() && parent() && parent()->isDeprecatedFlexibleBox(); } 508 bool isFlexItemIncludingDeprecated() const { return !isInline() && !isFloatingOrOutOfFlowPositioned() && parent() && parent()->isFlexibleBoxIncludingDeprecated(); } 509 510 virtual LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const; 511 virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const OVERRIDE; 512 513 virtual LayoutUnit offsetLeft() const OVERRIDE; 514 virtual LayoutUnit offsetTop() const OVERRIDE; 515 516 LayoutPoint flipForWritingModeForChild(const RenderBox* child, const LayoutPoint&) const; 517 LayoutUnit flipForWritingMode(LayoutUnit position) const; // The offset is in the block direction (y for horizontal writing modes, x for vertical writing modes). 518 LayoutPoint flipForWritingMode(const LayoutPoint&) const; 519 LayoutPoint flipForWritingModeIncludingColumns(const LayoutPoint&) const; 520 LayoutSize flipForWritingMode(const LayoutSize&) const; 521 void flipForWritingMode(LayoutRect&) const; 522 FloatPoint flipForWritingMode(const FloatPoint&) const; 523 void flipForWritingMode(FloatRect&) const; 524 // These represent your location relative to your container as a physical offset. 525 // In layout related methods you almost always want the logical location (e.g. x() and y()). 526 LayoutPoint topLeftLocation() const; 527 LayoutSize topLeftLocationOffset() const; 528 529 LayoutRect logicalVisualOverflowRectForPropagation(RenderStyle*) const; 530 LayoutRect visualOverflowRectForPropagation(RenderStyle*) const; 531 LayoutRect logicalLayoutOverflowRectForPropagation(RenderStyle*) const; 532 LayoutRect layoutOverflowRectForPropagation(RenderStyle*) const; 533 534 RenderOverflow* hasRenderOverflow() const { return m_overflow.get(); } 535 bool hasVisualOverflow() const { return m_overflow && !borderBoxRect().contains(m_overflow->visualOverflowRect()); } 536 537 virtual bool needsPreferredWidthsRecalculation() const; 538 virtual void computeIntrinsicRatioInformation(FloatSize& /* intrinsicSize */, double& /* intrinsicRatio */, bool& /* isPercentageIntrinsicSize */) const { } 539 540 IntSize scrolledContentOffset() const; 541 LayoutSize cachedSizeForOverflowClip() const; 542 void applyCachedClipAndScrollOffsetForRepaint(LayoutRect& paintRect) const; 543 544 virtual bool hasRelativeDimensions() const; 545 virtual bool hasRelativeLogicalHeight() const; 546 virtual bool hasViewportPercentageLogicalHeight() const; 547 548 bool hasHorizontalLayoutOverflow() const 549 { 550 if (RenderOverflow* overflow = hasRenderOverflow()) { 551 LayoutRect layoutOverflowRect = overflow->layoutOverflowRect(); 552 flipForWritingMode(layoutOverflowRect); 553 return layoutOverflowRect.x() < x() || layoutOverflowRect.maxX() > x() + logicalWidth(); 554 } 555 556 return false; 557 } 558 559 bool hasVerticalLayoutOverflow() const 560 { 561 if (RenderOverflow* overflow = hasRenderOverflow()) { 562 LayoutRect layoutOverflowRect = overflow->layoutOverflowRect(); 563 flipForWritingMode(layoutOverflowRect); 564 return layoutOverflowRect.y() < y() || layoutOverflowRect.maxY() > y() + logicalHeight(); 565 } 566 567 return false; 568 } 569 570 virtual RenderBox* createAnonymousBoxWithSameTypeAs(const RenderObject*) const 571 { 572 ASSERT_NOT_REACHED(); 573 return 0; 574 } 575 576 bool hasSameDirectionAs(const RenderBox* object) const { return style()->direction() == object->style()->direction(); } 577 578#if ENABLE(CSS_SHAPES) 579 ShapeOutsideInfo* shapeOutsideInfo() const 580 { 581 return isFloatingWithShapeOutside() && ShapeOutsideInfo::isEnabledFor(this) ? ShapeOutsideInfo::info(this) : 0; 582 } 583#endif 584 585protected: 586 virtual void willBeDestroyed(); 587 588 virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle); 589 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle); 590 virtual void updateFromStyle() OVERRIDE; 591 592 // Returns false if it could not cheaply compute the extent (e.g. fixed background), in which case the returned rect may be incorrect. 593 bool getBackgroundPaintedExtent(LayoutRect&) const; 594 virtual bool foregroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect, unsigned maxDepthToTest) const; 595 virtual bool computeBackgroundIsKnownToBeObscured() OVERRIDE; 596 597 void paintBackground(const PaintInfo&, const LayoutRect&, BackgroundBleedAvoidance = BackgroundBleedNone); 598 599 void paintFillLayer(const PaintInfo&, const Color&, const FillLayer*, const LayoutRect&, BackgroundBleedAvoidance, CompositeOperator, RenderObject* backgroundObject); 600 void paintFillLayers(const PaintInfo&, const Color&, const FillLayer*, const LayoutRect&, BackgroundBleedAvoidance = BackgroundBleedNone, CompositeOperator = CompositeSourceOver, RenderObject* backgroundObject = 0); 601 602 void paintMaskImages(const PaintInfo&, const LayoutRect&); 603 604 BackgroundBleedAvoidance determineBackgroundBleedAvoidance(GraphicsContext*) const; 605 bool backgroundHasOpaqueTopLayer() const; 606 607#if PLATFORM(MAC) 608 void paintCustomHighlight(const LayoutPoint&, const AtomicString& type, bool behindText); 609#endif 610 611 void computePositionedLogicalWidth(LogicalExtentComputedValues&, RenderRegion* = 0) const; 612 613 LayoutUnit computeIntrinsicLogicalWidthUsing(Length logicalWidthLength, LayoutUnit availableLogicalWidth, LayoutUnit borderAndPadding) const; 614 615 virtual bool shouldComputeSizeAsReplaced() const { return isReplaced() && !isInlineBlockOrInlineTable(); } 616 617 virtual void mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = 0) const OVERRIDE; 618 virtual const RenderObject* pushMappingToContainer(const RenderLayerModelObject*, RenderGeometryMap&) const OVERRIDE; 619 virtual void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const; 620 621 void paintRootBoxFillLayers(const PaintInfo&); 622 623 RenderObject* splitAnonymousBoxesAroundChild(RenderObject* beforeChild); 624 625private: 626#if ENABLE(CSS_SHAPES) 627 void updateShapeOutsideInfoAfterStyleChange(const ShapeValue* shapeOutside, const ShapeValue* oldShapeOutside); 628#endif 629 630 bool fixedElementLaysOutRelativeToFrame(Frame*, FrameView*) const; 631 632 bool includeVerticalScrollbarSize() const; 633 bool includeHorizontalScrollbarSize() const; 634 635 // Returns true if we did a full repaint 636 bool repaintLayerRectsForImage(WrappedImagePtr image, const FillLayer* layers, bool drawingBackground); 637 638 bool skipContainingBlockForPercentHeightCalculation(const RenderBox* containingBlock) const; 639 640 LayoutUnit containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock, RenderRegion* = 0, bool checkForPerpendicularWritingMode = true) const; 641 LayoutUnit containingBlockLogicalHeightForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode = true) const; 642 643 LayoutUnit viewLogicalHeightForPercentages() const; 644 645 void computePositionedLogicalHeight(LogicalExtentComputedValues&) const; 646 void computePositionedLogicalWidthUsing(Length logicalWidth, const RenderBoxModelObject* containerBlock, TextDirection containerDirection, 647 LayoutUnit containerLogicalWidth, LayoutUnit bordersPlusPadding, 648 Length logicalLeft, Length logicalRight, Length marginLogicalLeft, Length marginLogicalRight, 649 LogicalExtentComputedValues&) const; 650 void computePositionedLogicalHeightUsing(Length logicalHeightLength, const RenderBoxModelObject* containerBlock, 651 LayoutUnit containerLogicalHeight, LayoutUnit bordersPlusPadding, LayoutUnit logicalHeight, 652 Length logicalTop, Length logicalBottom, Length marginLogicalTop, Length marginLogicalBottom, 653 LogicalExtentComputedValues&) const; 654 655 void computePositionedLogicalHeightReplaced(LogicalExtentComputedValues&) const; 656 void computePositionedLogicalWidthReplaced(LogicalExtentComputedValues&) const; 657 658 LayoutUnit fillAvailableMeasure(LayoutUnit availableLogicalWidth) const; 659 LayoutUnit fillAvailableMeasure(LayoutUnit availableLogicalWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const; 660 661 virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const; 662 663 // This function calculates the minimum and maximum preferred widths for an object. 664 // These values are used in shrink-to-fit layout systems. 665 // These include tables, positioned objects, floats and flexible boxes. 666 virtual void computePreferredLogicalWidths() { setPreferredLogicalWidthsDirty(false); } 667 668 virtual LayoutRect frameRectForStickyPositioning() const OVERRIDE { return frameRect(); } 669 670private: 671 // The width/height of the contents + borders + padding. The x/y location is relative to our container (which is not always our parent). 672 LayoutRect m_frameRect; 673 674protected: 675 LayoutBoxExtent m_marginBox; 676 677 // The preferred logical width of the element if it were to break its lines at every possible opportunity. 678 LayoutUnit m_minPreferredLogicalWidth; 679 680 // The preferred logical width of the element if it never breaks any lines at all. 681 LayoutUnit m_maxPreferredLogicalWidth; 682 683 // For inline replaced elements, the inline box that owns us. 684 InlineBox* m_inlineBoxWrapper; 685 686 // Our overflow information. 687 OwnPtr<RenderOverflow> m_overflow; 688 689private: 690 // Used to store state between styleWillChange and styleDidChange 691 static bool s_hadOverflowClip; 692}; 693 694inline RenderBox* toRenderBox(RenderObject* object) 695{ 696 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isBox()); 697 return static_cast<RenderBox*>(object); 698} 699 700inline const RenderBox* toRenderBox(const RenderObject* object) 701{ 702 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isBox()); 703 return static_cast<const RenderBox*>(object); 704} 705 706// This will catch anyone doing an unnecessary cast. 707void toRenderBox(const RenderBox*); 708 709inline RenderBox* RenderBox::previousSiblingBox() const 710{ 711 return toRenderBox(previousSibling()); 712} 713 714inline RenderBox* RenderBox::nextSiblingBox() const 715{ 716 return toRenderBox(nextSibling()); 717} 718 719inline RenderBox* RenderBox::parentBox() const 720{ 721 return toRenderBox(parent()); 722} 723 724inline RenderBox* RenderBox::firstChildBox() const 725{ 726 return toRenderBox(firstChild()); 727} 728 729inline RenderBox* RenderBox::lastChildBox() const 730{ 731 return toRenderBox(lastChild()); 732} 733 734} // namespace WebCore 735 736#endif // RenderBox_h 737