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26 #ifndef RenderScrollbarPart_h
27 #define RenderScrollbarPart_h
29 #include "RenderBlock.h"
30 #include "ScrollTypes.h"
34 class RenderScrollbar;
36 class RenderScrollbarPart : public RenderBlock {
38 RenderScrollbarPart(Node*, RenderScrollbar* = 0, ScrollbarPart = NoPart);
39 virtual ~RenderScrollbarPart();
41 virtual const char* renderName() const { return "RenderScrollbarPart"; }
43 virtual bool requiresLayer() const { return false; }
45 virtual void layout();
46 virtual void computePreferredLogicalWidths();
48 void paintIntoRect(GraphicsContext*, const LayoutPoint&, const LayoutRect&);
50 // Scrollbar parts needs to be rendered at device pixel boundaries.
51 virtual LayoutUnit marginTop() const OVERRIDE { ASSERT(isIntegerValue(m_marginBox.top())); return m_marginBox.top(); }
52 virtual LayoutUnit marginBottom() const OVERRIDE { ASSERT(isIntegerValue(m_marginBox.bottom())); return m_marginBox.bottom(); }
53 virtual LayoutUnit marginLeft() const OVERRIDE { ASSERT(isIntegerValue(m_marginBox.left())); return m_marginBox.left(); }
54 virtual LayoutUnit marginRight() const OVERRIDE { ASSERT(isIntegerValue(m_marginBox.right())); return m_marginBox.right(); }
56 virtual bool isRenderScrollbarPart() const { return true; }
57 RenderObject* rendererOwningScrollbar() const;
60 virtual void styleWillChange(StyleDifference diff, const RenderStyle* newStyle);
61 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
62 virtual void imageChanged(WrappedImagePtr, const IntRect* = 0);
65 void layoutHorizontalPart();
66 void layoutVerticalPart();
68 void computeScrollbarWidth();
69 void computeScrollbarHeight();
71 RenderScrollbar* m_scrollbar;
75 inline RenderScrollbarPart* toRenderScrollbarPart(RenderObject* object)
77 ASSERT(!object || object->isRenderScrollbarPart());
78 return static_cast<RenderScrollbarPart*>(object);
81 inline const RenderScrollbarPart* toRenderScrollbarPart(const RenderObject* object)
83 ASSERT(!object || object->isRenderScrollbarPart());
84 return static_cast<const RenderScrollbarPart*>(object);
87 // This will catch anyone doing an unnecessary cast.
88 void toRenderScrollbarPart(const RenderScrollbarPart*);
90 } // namespace WebCore
92 #endif // RenderScrollbarPart_h