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26 #ifndef RenderScrollbarPart_h
27 #define RenderScrollbarPart_h
29 #include "core/rendering/RenderBlock.h"
30 #include "platform/scroll/ScrollTypes.h"
34 class RenderScrollbar;
36 class RenderScrollbarPart final : public RenderBlock {
38 static RenderScrollbarPart* createAnonymous(Document*, RenderScrollbar* = 0, ScrollbarPart = NoPart);
40 virtual ~RenderScrollbarPart();
42 virtual const char* renderName() const override { return "RenderScrollbarPart"; }
44 virtual LayerType layerTypeRequired() const override { return NoLayer; }
46 virtual void layout() override;
48 // Scrollbar parts needs to be rendered at device pixel boundaries.
49 virtual LayoutUnit marginTop() const override { ASSERT(isIntegerValue(m_marginBox.top())); return m_marginBox.top(); }
50 virtual LayoutUnit marginBottom() const override { ASSERT(isIntegerValue(m_marginBox.bottom())); return m_marginBox.bottom(); }
51 virtual LayoutUnit marginLeft() const override { ASSERT(isIntegerValue(m_marginBox.left())); return m_marginBox.left(); }
52 virtual LayoutUnit marginRight() const override { ASSERT(isIntegerValue(m_marginBox.right())); return m_marginBox.right(); }
54 virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectRenderScrollbarPart || RenderBlock::isOfType(type); }
55 RenderObject* rendererOwningScrollbar() const;
58 virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) override;
59 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
60 virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) override;
63 RenderScrollbarPart(RenderScrollbar*, ScrollbarPart);
65 virtual void computePreferredLogicalWidths() override;
67 // Have all padding getters return 0. The important point here is to avoid resolving percents
68 // against the containing block, since scroll bar corners don't always have one (so it would
69 // crash). Scroll bar corners are not actually laid out, and they don't have child content, so
70 // what we return here doesn't really matter.
71 virtual LayoutUnit paddingTop() const override { return LayoutUnit(); }
72 virtual LayoutUnit paddingBottom() const override { return LayoutUnit(); }
73 virtual LayoutUnit paddingLeft() const override { return LayoutUnit(); }
74 virtual LayoutUnit paddingRight() const override { return LayoutUnit(); }
75 virtual LayoutUnit paddingBefore() const override { return LayoutUnit(); }
76 virtual LayoutUnit paddingAfter() const override { return LayoutUnit(); }
77 virtual LayoutUnit paddingStart() const override { return LayoutUnit(); }
78 virtual LayoutUnit paddingEnd() const override { return LayoutUnit(); }
80 void layoutHorizontalPart();
81 void layoutVerticalPart();
83 void computeScrollbarWidth();
84 void computeScrollbarHeight();
86 RenderScrollbar* m_scrollbar;
90 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderScrollbarPart, isRenderScrollbarPart());
94 #endif // RenderScrollbarPart_h