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26 #ifndef RenderScrollbar_h
27 #define RenderScrollbar_h
30 #include "RenderStyleConstants.h"
31 #include "Scrollbar.h"
32 #include <wtf/HashMap.h>
38 class RenderScrollbarPart;
41 class RenderScrollbar : public Scrollbar {
43 RenderScrollbar(ScrollableArea*, ScrollbarOrientation, Node*, Frame*);
46 friend class Scrollbar;
47 static PassRefPtr<Scrollbar> createCustomScrollbar(ScrollableArea*, ScrollbarOrientation, Node*, Frame* owningFrame = 0);
48 virtual ~RenderScrollbar();
50 static ScrollbarPart partForStyleResolve();
51 static RenderScrollbar* scrollbarForStyleResolve();
53 RenderBox* owningRenderer() const;
55 void paintPart(GraphicsContext*, ScrollbarPart, const IntRect&);
57 IntRect buttonRect(ScrollbarPart);
58 IntRect trackRect(int startLength, int endLength);
59 IntRect trackPieceRectWithMargins(ScrollbarPart, const IntRect&);
61 int minimumThumbLength();
63 virtual bool isOverlayScrollbar() const { return false; }
66 virtual void setParent(ScrollView*);
67 virtual void setEnabled(bool);
69 virtual void paint(GraphicsContext*, const IntRect& damageRect);
71 virtual void setHoveredPart(ScrollbarPart);
72 virtual void setPressedPart(ScrollbarPart);
74 virtual void styleChanged();
76 virtual bool isCustomScrollbar() const { return true; }
78 void updateScrollbarParts(bool destroy = false);
80 PassRefPtr<RenderStyle> getScrollbarPseudoStyle(ScrollbarPart, PseudoId);
81 void updateScrollbarPart(ScrollbarPart, bool destroy = false);
83 // This Scrollbar(Widget) may outlive the DOM which created it (during tear down),
84 // so we keep a reference to the Node which caused this custom scrollbar creation.
85 // This will not create a reference cycle as the Widget tree is owned by our containing
86 // FrameView which this Node pointer can in no way keep alive. See webkit bug 80610.
90 HashMap<unsigned, RenderScrollbarPart*> m_parts;
93 inline RenderScrollbar* toRenderScrollbar(ScrollbarThemeClient* scrollbar)
95 ASSERT(!scrollbar || scrollbar->isCustomScrollbar());
96 return static_cast<RenderScrollbar*>(scrollbar);
99 // This will catch anyone doing an unnecessary cast.
100 void toRenderScrollbar(const RenderScrollbar*);
102 } // namespace WebCore
104 #endif // RenderScrollbar_h