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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) 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 
     30 namespace WebCore {
     31 
     32 struct PaintInfo;
     33 
     34 enum LogicalWidthType { LogicalWidth, MinLogicalWidth, MaxLogicalWidth };
     35 
     36 enum OverlayScrollbarSizeRelevancy { IgnoreOverlayScrollbarSize, IncludeOverlayScrollbarSize };
     37 
     38 class RenderBox : public RenderBoxModelObject {
     39 public:
     40     RenderBox(Node*);
     41     virtual ~RenderBox();
     42 
     43     // Use this with caution! No type checking is done!
     44     RenderBox* firstChildBox() const;
     45     RenderBox* lastChildBox() const;
     46 
     47     int x() const { return m_frameRect.x(); }
     48     int y() const { return m_frameRect.y(); }
     49     int width() const { return m_frameRect.width(); }
     50     int height() const { return m_frameRect.height(); }
     51 
     52     void setX(int x) { m_frameRect.setX(x); }
     53     void setY(int y) { m_frameRect.setY(y); }
     54     void setWidth(int width) { m_frameRect.setWidth(width); }
     55     void setHeight(int height) { m_frameRect.setHeight(height); }
     56 
     57     int logicalLeft() const { return style()->isHorizontalWritingMode() ? x() : y(); }
     58     int logicalRight() const { return logicalLeft() + logicalWidth(); }
     59     int logicalTop() const { return style()->isHorizontalWritingMode() ? y() : x(); }
     60     int logicalBottom() const { return logicalTop() + logicalHeight(); }
     61     int logicalWidth() const { return style()->isHorizontalWritingMode() ? width() : height(); }
     62     int logicalHeight() const { return style()->isHorizontalWritingMode() ? height() : width(); }
     63 
     64     void setLogicalLeft(int left)
     65     {
     66         if (style()->isHorizontalWritingMode())
     67             setX(left);
     68         else
     69             setY(left);
     70     }
     71     void setLogicalTop(int top)
     72     {
     73         if (style()->isHorizontalWritingMode())
     74             setY(top);
     75         else
     76             setX(top);
     77     }
     78     void setLogicalWidth(int size)
     79     {
     80         if (style()->isHorizontalWritingMode())
     81             setWidth(size);
     82         else
     83             setHeight(size);
     84     }
     85     void setLogicalHeight(int size)
     86     {
     87         if (style()->isHorizontalWritingMode())
     88             setHeight(size);
     89         else
     90             setWidth(size);
     91     }
     92     void setLogicalLocation(int left, int top)
     93     {
     94         if (style()->isHorizontalWritingMode())
     95             setLocation(left, top);
     96         else
     97             setLocation(top, left);
     98     }
     99 
    100     IntPoint location() const { return m_frameRect.location(); }
    101     IntSize locationOffset() const { return IntSize(x(), y()); }
    102     IntSize size() const { return m_frameRect.size(); }
    103 
    104     void setLocation(const IntPoint& location) { m_frameRect.setLocation(location); }
    105     void setLocation(int x, int y) { setLocation(IntPoint(x, y)); }
    106 
    107     void setSize(const IntSize& size) { m_frameRect.setSize(size); }
    108     void move(int dx, int dy) { m_frameRect.move(dx, dy); }
    109 
    110     IntRect frameRect() const { return m_frameRect; }
    111     void setFrameRect(const IntRect& rect) { m_frameRect = rect; }
    112 
    113     IntRect borderBoxRect() const { return IntRect(0, 0, width(), height()); }
    114     virtual IntRect borderBoundingBox() const { return borderBoxRect(); }
    115 
    116     // The content area of the box (excludes padding and border).
    117     IntRect contentBoxRect() const { return IntRect(borderLeft() + paddingLeft(), borderTop() + paddingTop(), contentWidth(), contentHeight()); }
    118     // The content box in absolute coords. Ignores transforms.
    119     IntRect absoluteContentBox() const;
    120     // The content box converted to absolute coords (taking transforms into account).
    121     FloatQuad absoluteContentQuad() const;
    122 
    123     // Bounds of the outline box in absolute coords. Respects transforms
    124     virtual IntRect outlineBoundsForRepaint(RenderBoxModelObject* /*repaintContainer*/, IntPoint* cachedOffsetToRepaintContainer) const;
    125     virtual void addFocusRingRects(Vector<IntRect>&, int tx, int ty);
    126 
    127     // Use this with caution! No type checking is done!
    128     RenderBox* previousSiblingBox() const;
    129     RenderBox* nextSiblingBox() const;
    130     RenderBox* parentBox() const;
    131 
    132     // Visual and layout overflow are in the coordinate space of the box.  This means that they aren't purely physical directions.
    133     // For horizontal-tb and vertical-lr they will match physical directions, but for horizontal-bt and vertical-rl, the top/bottom and left/right
    134     // respectively are flipped when compared to their physical counterparts.  For example minX is on the left in vertical-lr,
    135     // but it is on the right in vertical-rl.
    136     IntRect layoutOverflowRect() const { return m_overflow ? m_overflow->layoutOverflowRect() : clientBoxRect(); }
    137     int minYLayoutOverflow() const { return m_overflow? m_overflow->minYLayoutOverflow() : borderTop(); }
    138     int maxYLayoutOverflow() const { return m_overflow ? m_overflow->maxYLayoutOverflow() : borderTop() + clientHeight(); }
    139     int minXLayoutOverflow() const { return m_overflow ? m_overflow->minXLayoutOverflow() : borderLeft(); }
    140     int maxXLayoutOverflow() const { return m_overflow ? m_overflow->maxXLayoutOverflow() : borderLeft() + clientWidth(); }
    141     int logicalLeftLayoutOverflow() const { return style()->isHorizontalWritingMode() ? minXLayoutOverflow() : minYLayoutOverflow(); }
    142     int logicalRightLayoutOverflow() const { return style()->isHorizontalWritingMode() ? maxXLayoutOverflow() : maxYLayoutOverflow(); }
    143 
    144     IntRect visualOverflowRect() const { return m_overflow ? m_overflow->visualOverflowRect() : borderBoxRect(); }
    145     int minYVisualOverflow() const { return m_overflow? m_overflow->minYVisualOverflow() : 0; }
    146     int maxYVisualOverflow() const { return m_overflow ? m_overflow->maxYVisualOverflow() : height(); }
    147     int minXVisualOverflow() const { return m_overflow ? m_overflow->minXVisualOverflow() : 0; }
    148     int maxXVisualOverflow() const { return m_overflow ? m_overflow->maxXVisualOverflow() : width(); }
    149     int logicalLeftVisualOverflow() const { return style()->isHorizontalWritingMode() ? minXVisualOverflow() : minYVisualOverflow(); }
    150     int logicalRightVisualOverflow() const { return style()->isHorizontalWritingMode() ? maxXVisualOverflow() : maxYVisualOverflow(); }
    151 
    152     void addLayoutOverflow(const IntRect&);
    153     void addVisualOverflow(const IntRect&);
    154 
    155     void addShadowOverflow();
    156     void addOverflowFromChild(RenderBox* child) { addOverflowFromChild(child, IntSize(child->x(), child->y())); }
    157     void addOverflowFromChild(RenderBox* child, const IntSize& delta);
    158     void clearLayoutOverflow();
    159 
    160     void updateLayerTransform();
    161 
    162     void blockDirectionOverflow(bool isLineHorizontal, int& logicalTopLayoutOverflow, int& logicalBottomLayoutOverflow,
    163                                 int& logicalTopVisualOverflow, int& logicalBottomVisualOverflow);
    164 
    165     int contentWidth() const { return clientWidth() - paddingLeft() - paddingRight(); }
    166     int contentHeight() const { return clientHeight() - paddingTop() - paddingBottom(); }
    167     int contentLogicalWidth() const { return style()->isHorizontalWritingMode() ? contentWidth() : contentHeight(); }
    168     int contentLogicalHeight() const { return style()->isHorizontalWritingMode() ? contentHeight() : contentWidth(); }
    169 
    170     // IE extensions. Used to calculate offsetWidth/Height.  Overridden by inlines (RenderFlow)
    171     // to return the remaining width on a given line (and the height of a single line).
    172     virtual int offsetWidth() const { return width(); }
    173     virtual int offsetHeight() const { return height(); }
    174 
    175     // More IE extensions.  clientWidth and clientHeight represent the interior of an object
    176     // excluding border and scrollbar.  clientLeft/Top are just the borderLeftWidth and borderTopWidth.
    177     int clientLeft() const { return borderLeft(); }
    178     int clientTop() const { return borderTop(); }
    179     int clientWidth() const;
    180     int clientHeight() const;
    181     int clientLogicalWidth() const { return style()->isHorizontalWritingMode() ? clientWidth() : clientHeight(); }
    182     int clientLogicalHeight() const { return style()->isHorizontalWritingMode() ? clientHeight() : clientWidth(); }
    183     int clientLogicalBottom() const { return borderBefore() + clientLogicalHeight(); }
    184     IntRect clientBoxRect() const { return IntRect(clientLeft(), clientTop(), clientWidth(), clientHeight()); }
    185 
    186     // scrollWidth/scrollHeight will be the same as clientWidth/clientHeight unless the
    187     // object has overflow:hidden/scroll/auto specified and also has overflow.
    188     // scrollLeft/Top return the current scroll position.  These methods are virtual so that objects like
    189     // textareas can scroll shadow content (but pretend that they are the objects that are
    190     // scrolling).
    191     virtual int scrollLeft() const;
    192     virtual int scrollTop() const;
    193     virtual int scrollWidth() const;
    194     virtual int scrollHeight() const;
    195     virtual void setScrollLeft(int);
    196     virtual void setScrollTop(int);
    197 
    198     virtual int marginTop() const { return m_marginTop; }
    199     virtual int marginBottom() const { return m_marginBottom; }
    200     virtual int marginLeft() const { return m_marginLeft; }
    201     virtual int marginRight() const { return m_marginRight; }
    202     void setMarginTop(int margin) { m_marginTop = margin; }
    203     void setMarginBottom(int margin) { m_marginBottom = margin; }
    204     void setMarginLeft(int margin) { m_marginLeft = margin; }
    205     void setMarginRight(int margin) { m_marginRight = margin; }
    206     virtual int marginBefore() const;
    207     virtual int marginAfter() const;
    208     virtual int marginStart() const;
    209     virtual int marginEnd() const;
    210     void setMarginStart(int);
    211     void setMarginEnd(int);
    212     void setMarginBefore(int);
    213     void setMarginAfter(int);
    214 
    215     // The following five functions are used to implement collapsing margins.
    216     // All objects know their maximal positive and negative margins.  The
    217     // formula for computing a collapsed margin is |maxPosMargin| - |maxNegmargin|.
    218     // For a non-collapsing box, such as a leaf element, this formula will simply return
    219     // the margin of the element.  Blocks override the maxMarginBefore and maxMarginAfter
    220     // methods.
    221     enum MarginSign { PositiveMargin, NegativeMargin };
    222     virtual bool isSelfCollapsingBlock() const { return false; }
    223     virtual int collapsedMarginBefore() const { return marginBefore(); }
    224     virtual int collapsedMarginAfter() const { return marginAfter(); }
    225 
    226     virtual void absoluteRects(Vector<IntRect>&, int tx, int ty);
    227     virtual void absoluteQuads(Vector<FloatQuad>&);
    228 
    229     IntRect reflectionBox() const;
    230     int reflectionOffset() const;
    231     // Given a rect in the object's coordinate space, returns the corresponding rect in the reflection.
    232     IntRect reflectedRect(const IntRect&) const;
    233 
    234     virtual void layout();
    235     virtual void paint(PaintInfo&, int tx, int ty);
    236     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);
    237 
    238     virtual void destroy();
    239 
    240     virtual int minPreferredLogicalWidth() const;
    241     virtual int maxPreferredLogicalWidth() const;
    242 
    243     int overrideSize() const;
    244     int overrideWidth() const;
    245     int overrideHeight() const;
    246     virtual void setOverrideSize(int);
    247 
    248     virtual IntSize offsetFromContainer(RenderObject*, const IntPoint&) const;
    249 
    250     int computeBorderBoxLogicalWidth(int width) const;
    251     int computeBorderBoxLogicalHeight(int height) const;
    252     int computeContentBoxLogicalWidth(int width) const;
    253     int computeContentBoxLogicalHeight(int height) const;
    254 
    255     virtual void borderFitAdjust(int& /*x*/, int& /*w*/) const { } // Shrink the box in which the border paints if border-fit is set.
    256 
    257     // Resolve auto margins in the inline direction of the containing block so that objects can be pushed to the start, middle or end
    258     // of the containing block.
    259     void computeInlineDirectionMargins(RenderBlock* containingBlock, int containerWidth, int childWidth);
    260 
    261     // Used to resolve margins in the containing block's block-flow direction.
    262     void computeBlockDirectionMargins(RenderBlock* containingBlock);
    263 
    264     void positionLineBox(InlineBox*);
    265 
    266     virtual InlineBox* createInlineBox();
    267     void dirtyLineBoxes(bool fullLayout);
    268 
    269     // For inline replaced elements, this function returns the inline box that owns us.  Enables
    270     // the replaced RenderObject to quickly determine what line it is contained on and to easily
    271     // iterate over structures on the line.
    272     InlineBox* inlineBoxWrapper() const { return m_inlineBoxWrapper; }
    273     void setInlineBoxWrapper(InlineBox* boxWrapper) { m_inlineBoxWrapper = boxWrapper; }
    274     void deleteLineBoxWrapper();
    275 
    276     virtual IntRect clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer);
    277     virtual void computeRectForRepaint(RenderBoxModelObject* repaintContainer, IntRect&, bool fixed = false);
    278 
    279     virtual void repaintDuringLayoutIfMoved(const IntRect&);
    280 
    281     virtual int containingBlockLogicalWidthForContent() const;
    282     int perpendicularContainingBlockLogicalHeight() const;
    283 
    284     virtual void computeLogicalWidth();
    285     virtual void computeLogicalHeight();
    286 
    287     bool stretchesToViewport() const
    288     {
    289         return document()->inQuirksMode() && style()->logicalHeight().isAuto() && !isFloatingOrPositioned() && (isRoot() || isBody());
    290     }
    291 
    292     virtual IntSize intrinsicSize() const { return IntSize(); }
    293     int intrinsicLogicalWidth() const { return style()->isHorizontalWritingMode() ? intrinsicSize().width() : intrinsicSize().height(); }
    294     int intrinsicLogicalHeight() const { return style()->isHorizontalWritingMode() ? intrinsicSize().height() : intrinsicSize().width(); }
    295 
    296     // Whether or not the element shrinks to its intrinsic width (rather than filling the width
    297     // of a containing block).  HTML4 buttons, <select>s, <input>s, legends, and floating/compact elements do this.
    298     bool sizesToIntrinsicLogicalWidth(LogicalWidthType) const;
    299     virtual bool stretchesToMinIntrinsicLogicalWidth() const { return false; }
    300 
    301     int computeLogicalWidthUsing(LogicalWidthType, int availableLogicalWidth);
    302     int computeLogicalHeightUsing(const Length& height);
    303     int computeReplacedLogicalWidthUsing(Length width) const;
    304     int computeReplacedLogicalHeightUsing(Length height) const;
    305 
    306     virtual int computeReplacedLogicalWidth(bool includeMaxWidth = true) const;
    307     virtual int computeReplacedLogicalHeight() const;
    308 
    309     int computePercentageLogicalHeight(const Length& height);
    310 
    311     // Block flows subclass availableWidth to handle multi column layout (shrinking the width available to children when laying out.)
    312     virtual int availableLogicalWidth() const { return contentLogicalWidth(); }
    313     int availableLogicalHeight() const;
    314     int availableLogicalHeightUsing(const Length&) const;
    315 
    316     // There are a few cases where we need to refer specifically to the available physical width and available physical height.
    317     // Relative positioning is one of those cases, since left/top offsets are physical.
    318     int availableWidth() const { return style()->isHorizontalWritingMode() ? availableLogicalWidth() : availableLogicalHeight(); }
    319     int availableHeight() const { return style()->isHorizontalWritingMode() ? availableLogicalHeight() : availableLogicalWidth(); }
    320 
    321     virtual int verticalScrollbarWidth() const;
    322     int horizontalScrollbarHeight() const;
    323     int scrollbarLogicalHeight() const { return style()->isHorizontalWritingMode() ? horizontalScrollbarHeight() : verticalScrollbarWidth(); }
    324     virtual bool scroll(ScrollDirection, ScrollGranularity, float multiplier = 1, Node** stopNode = 0);
    325     virtual bool logicalScroll(ScrollLogicalDirection, ScrollGranularity, float multiplier = 1, Node** stopNode = 0);
    326     bool canBeScrolledAndHasScrollableArea() const;
    327     virtual bool canBeProgramaticallyScrolled(bool) const;
    328     virtual void autoscroll();
    329     virtual void stopAutoscroll() { }
    330     virtual void panScroll(const IntPoint&);
    331     bool hasAutoVerticalScrollbar() const { return hasOverflowClip() && (style()->overflowY() == OAUTO || style()->overflowY() == OOVERLAY); }
    332     bool hasAutoHorizontalScrollbar() const { return hasOverflowClip() && (style()->overflowX() == OAUTO || style()->overflowX() == OOVERLAY); }
    333     bool scrollsOverflow() const { return scrollsOverflowX() || scrollsOverflowY(); }
    334     bool scrollsOverflowX() const { return hasOverflowClip() && (style()->overflowX() == OSCROLL || hasAutoHorizontalScrollbar()); }
    335     bool scrollsOverflowY() const { return hasOverflowClip() && (style()->overflowY() == OSCROLL || hasAutoVerticalScrollbar()); }
    336 
    337     virtual IntRect localCaretRect(InlineBox*, int caretOffset, int* extraWidthToEndOfLine = 0);
    338 
    339     virtual IntRect overflowClipRect(int tx, int ty, OverlayScrollbarSizeRelevancy relevancy = IgnoreOverlayScrollbarSize);
    340     IntRect clipRect(int tx, int ty);
    341     virtual bool hasControlClip() const { return false; }
    342     virtual IntRect controlClipRect(int /*tx*/, int /*ty*/) const { return IntRect(); }
    343     bool pushContentsClip(PaintInfo&, int tx, int ty);
    344     void popContentsClip(PaintInfo&, PaintPhase originalPhase, int tx, int ty);
    345 
    346     virtual void paintObject(PaintInfo&, int /*tx*/, int /*ty*/) { ASSERT_NOT_REACHED(); }
    347     virtual void paintBoxDecorations(PaintInfo&, int tx, int ty);
    348     virtual void paintMask(PaintInfo&, int tx, int ty);
    349     virtual void imageChanged(WrappedImagePtr, const IntRect* = 0);
    350 
    351     // Called when a positioned object moves but doesn't necessarily change size.  A simplified layout is attempted
    352     // that just updates the object's position. If the size does change, the object remains dirty.
    353     bool tryLayoutDoingPositionedMovementOnly()
    354     {
    355         int oldWidth = width();
    356         computeLogicalWidth();
    357         // If we shrink to fit our width may have changed, so we still need full layout.
    358         if (oldWidth != width())
    359             return false;
    360         computeLogicalHeight();
    361         return true;
    362     }
    363 
    364     IntRect maskClipRect();
    365 
    366     virtual VisiblePosition positionForPoint(const IntPoint&);
    367 
    368     void removeFloatingOrPositionedChildFromBlockLists();
    369 
    370     RenderLayer* enclosingFloatPaintingLayer() const;
    371 
    372     virtual int firstLineBoxBaseline() const { return -1; }
    373     virtual int lastLineBoxBaseline() const { return -1; }
    374 
    375     bool shrinkToAvoidFloats() const;
    376     virtual bool avoidsFloats() const;
    377 
    378     virtual void markForPaginationRelayoutIfNeeded() { }
    379 
    380     bool isWritingModeRoot() const { return !parent() || parent()->style()->writingMode() != style()->writingMode(); }
    381 
    382     bool isDeprecatedFlexItem() const { return !isInline() && !isFloatingOrPositioned() && parent() && parent()->isFlexibleBox(); }
    383 
    384     virtual int lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const;
    385     virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const;
    386 
    387     enum FlippingAdjustment { ChildToParentFlippingAdjustment, ParentToChildFlippingAdjustment };
    388     IntPoint flipForWritingMode(const RenderBox* child, const IntPoint&, FlippingAdjustment) const;
    389     int flipForWritingMode(int position) const; // The offset is in the block direction (y for horizontal writing modes, x for vertical writing modes).
    390     IntPoint flipForWritingMode(const IntPoint&) const;
    391     IntPoint flipForWritingModeIncludingColumns(const IntPoint&) const;
    392     IntSize flipForWritingMode(const IntSize&) const;
    393     void flipForWritingMode(IntRect&) const;
    394     FloatPoint flipForWritingMode(const FloatPoint&) const;
    395     void flipForWritingMode(FloatRect&) const;
    396     IntSize locationOffsetIncludingFlipping() const;
    397 
    398     IntRect logicalVisualOverflowRectForPropagation(RenderStyle*) const;
    399     IntRect visualOverflowRectForPropagation(RenderStyle*) const;
    400     IntRect logicalLayoutOverflowRectForPropagation(RenderStyle*) const;
    401     IntRect layoutOverflowRectForPropagation(RenderStyle*) const;
    402 
    403     RenderOverflow* hasRenderOverflow() const { return m_overflow.get(); }
    404 
    405 #ifdef ANDROID_LAYOUT
    406     int getVisibleWidth() const { return m_visibleWidth; }
    407 #endif
    408 
    409 protected:
    410     virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle);
    411     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
    412     virtual void updateBoxModelInfoFromStyle();
    413 
    414     void paintFillLayer(const PaintInfo&, const Color&, const FillLayer*, int tx, int ty, int width, int height, CompositeOperator op, RenderObject* backgroundObject);
    415     void paintFillLayers(const PaintInfo&, const Color&, const FillLayer*, int tx, int ty, int width, int height, CompositeOperator = CompositeSourceOver, RenderObject* backgroundObject = 0);
    416 
    417     void paintBoxDecorationsWithSize(PaintInfo&, int tx, int ty, int width, int height);
    418     void paintMaskImages(const PaintInfo&, int tx, int ty, int width, int height);
    419 
    420 #if PLATFORM(MAC)
    421     void paintCustomHighlight(int tx, int ty, const AtomicString& type, bool behindText);
    422 #endif
    423 
    424     void computePositionedLogicalWidth();
    425 
    426     virtual bool shouldComputeSizeAsReplaced() const { return isReplaced() && !isInlineBlockOrInlineTable(); }
    427 
    428     virtual void mapLocalToContainer(RenderBoxModelObject* repaintContainer, bool fixed, bool useTransforms, TransformState&) const;
    429     virtual void mapAbsoluteToLocalPoint(bool fixed, bool useTransforms, TransformState&) const;
    430 
    431     void paintRootBoxFillLayers(const PaintInfo&);
    432 
    433 private:
    434     bool includeVerticalScrollbarSize() const;
    435     bool includeHorizontalScrollbarSize() const;
    436 
    437     // Returns true if we did a full repaint
    438     bool repaintLayerRectsForImage(WrappedImagePtr image, const FillLayer* layers, bool drawingBackground);
    439 
    440     int containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode = true) const;
    441     int containingBlockLogicalHeightForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode = true) const;
    442 
    443     void computePositionedLogicalHeight();
    444     void computePositionedLogicalWidthUsing(Length logicalWidth, const RenderBoxModelObject* containerBlock, TextDirection containerDirection,
    445                                             int containerLogicalWidth, int bordersPlusPadding,
    446                                             Length logicalLeft, Length logicalRight, Length marginLogicalLeft, Length marginLogicalRight,
    447                                             int& logicalWidthValue, int& marginLogicalLeftValue, int& marginLogicalRightValue, int& logicalLeftPos);
    448     void computePositionedLogicalHeightUsing(Length logicalHeight, const RenderBoxModelObject* containerBlock,
    449                                              int containerLogicalHeight, int bordersPlusPadding,
    450                                              Length logicalTop, Length logicalBottom, Length marginLogicalTop, Length marginLogicalBottom,
    451                                              int& logicalHeightValue, int& marginLogicalTopValue, int& marginLogicalBottomValue, int& logicalTopPos);
    452 
    453     void computePositionedLogicalHeightReplaced();
    454     void computePositionedLogicalWidthReplaced();
    455 
    456     // This function calculates the minimum and maximum preferred widths for an object.
    457     // These values are used in shrink-to-fit layout systems.
    458     // These include tables, positioned objects, floats and flexible boxes.
    459     virtual void computePreferredLogicalWidths() { setPreferredLogicalWidthsDirty(false); }
    460 
    461 private:
    462     // The width/height of the contents + borders + padding.  The x/y location is relative to our container (which is not always our parent).
    463     IntRect m_frameRect;
    464 
    465 protected:
    466 
    467 #ifdef ANDROID_LAYOUT
    468     void setVisibleWidth(int newWidth);
    469     bool checkAndSetRelayoutChildren(bool* relayoutChildren);
    470 #endif
    471 
    472     int m_marginLeft;
    473     int m_marginRight;
    474     int m_marginTop;
    475     int m_marginBottom;
    476 
    477     // The preferred logical width of the element if it were to break its lines at every possible opportunity.
    478     int m_minPreferredLogicalWidth;
    479 
    480     // The preferred logical width of the element if it never breaks any lines at all.
    481     int m_maxPreferredLogicalWidth;
    482 
    483     // For inline replaced elements, the inline box that owns us.
    484     InlineBox* m_inlineBoxWrapper;
    485 
    486     // Our overflow information.
    487     OwnPtr<RenderOverflow> m_overflow;
    488 
    489 private:
    490     // Used to store state between styleWillChange and styleDidChange
    491     static bool s_hadOverflowClip;
    492 
    493 #ifdef ANDROID_LAYOUT
    494     int m_visibleWidth;
    495     bool m_isVisibleWidthChangedBeforeLayout;
    496 #endif
    497 };
    498 
    499 inline RenderBox* toRenderBox(RenderObject* object)
    500 {
    501     ASSERT(!object || object->isBox());
    502     return static_cast<RenderBox*>(object);
    503 }
    504 
    505 inline const RenderBox* toRenderBox(const RenderObject* object)
    506 {
    507     ASSERT(!object || object->isBox());
    508     return static_cast<const RenderBox*>(object);
    509 }
    510 
    511 // This will catch anyone doing an unnecessary cast.
    512 void toRenderBox(const RenderBox*);
    513 
    514 inline RenderBox* RenderBox::previousSiblingBox() const
    515 {
    516     return toRenderBox(previousSibling());
    517 }
    518 
    519 inline RenderBox* RenderBox::nextSiblingBox() const
    520 {
    521     return toRenderBox(nextSibling());
    522 }
    523 
    524 inline RenderBox* RenderBox::parentBox() const
    525 {
    526     return toRenderBox(parent());
    527 }
    528 
    529 inline RenderBox* RenderBox::firstChildBox() const
    530 {
    531     return toRenderBox(firstChild());
    532 }
    533 
    534 inline RenderBox* RenderBox::lastChildBox() const
    535 {
    536     return toRenderBox(lastChild());
    537 }
    538 
    539 } // namespace WebCore
    540 
    541 #endif // RenderBox_h
    542