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26 #ifndef RenderScrollbar_h
27 #define RenderScrollbar_h
29 #include "core/rendering/style/RenderStyleConstants.h"
30 #include "platform/scroll/Scrollbar.h"
31 #include "wtf/HashMap.h"
38 class RenderScrollbarPart;
41 class RenderScrollbar FINAL : public Scrollbar {
43 RenderScrollbar(ScrollableArea*, ScrollbarOrientation, Node*, LocalFrame*);
46 friend class Scrollbar;
47 static PassRefPtr<Scrollbar> createCustomScrollbar(ScrollableArea*, ScrollbarOrientation, Node*, LocalFrame* owningFrame = 0);
48 virtual ~RenderScrollbar();
50 RenderBox* owningRenderer() const;
52 void paintPart(GraphicsContext*, ScrollbarPart, const IntRect&);
54 IntRect buttonRect(ScrollbarPart);
55 IntRect trackRect(int startLength, int endLength);
56 IntRect trackPieceRectWithMargins(ScrollbarPart, const IntRect&);
58 int minimumThumbLength();
60 virtual bool isOverlayScrollbar() const OVERRIDE { return false; }
63 virtual void setParent(Widget*) OVERRIDE;
64 virtual void setEnabled(bool) OVERRIDE;
66 virtual void setHoveredPart(ScrollbarPart) OVERRIDE;
67 virtual void setPressedPart(ScrollbarPart) OVERRIDE;
69 virtual void styleChanged() OVERRIDE;
71 virtual bool isCustomScrollbar() const OVERRIDE { return true; }
73 void updateScrollbarParts(bool destroy = false);
75 PassRefPtr<RenderStyle> getScrollbarPseudoStyle(ScrollbarPart, PseudoId);
76 void updateScrollbarPart(ScrollbarPart, bool destroy = false);
78 // This Scrollbar(Widget) may outlive the DOM which created it (during tear down),
79 // so we keep a reference to the Node which caused this custom scrollbar creation.
80 // This will not create a reference cycle as the Widget tree is owned by our containing
81 // FrameView which this Node pointer can in no way keep alive. See webkit bug 80610.
82 RefPtrWillBePersistent<Node> m_owner;
84 LocalFrame* m_owningFrame;
85 WillBePersistentHeapHashMap<unsigned, RawPtrWillBeMember<RenderScrollbarPart> > m_parts;
88 DEFINE_TYPE_CASTS(RenderScrollbar, ScrollbarThemeClient, scrollbar, scrollbar->isCustomScrollbar(), scrollbar.isCustomScrollbar());
92 #endif // RenderScrollbar_h