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1 /*
2  * Copyright (C) 2008, 2009 Apple Inc. All Rights Reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #ifndef RenderScrollbar_h
27 #define RenderScrollbar_h
28 
29 #include "RenderStyleConstants.h"
30 #include "Scrollbar.h"
31 #include <wtf/HashMap.h>
32 
33 namespace WebCore {
34 
35 class Frame;
36 class RenderBox;
37 class RenderScrollbarPart;
38 class RenderStyle;
39 
40 class RenderScrollbar : public Scrollbar {
41 protected:
42     RenderScrollbar(ScrollableArea*, ScrollbarOrientation, RenderBox*, Frame*);
43 
44 public:
45     friend class Scrollbar;
46     static PassRefPtr<Scrollbar> createCustomScrollbar(ScrollableArea*, ScrollbarOrientation, RenderBox*, Frame* owningFrame = 0);
47     virtual ~RenderScrollbar();
48 
49     static ScrollbarPart partForStyleResolve();
50     static RenderScrollbar* scrollbarForStyleResolve();
51 
52     RenderBox* owningRenderer() const;
clearOwningRenderer()53     void clearOwningRenderer() { m_owner = 0; }
54 
55     void paintPart(GraphicsContext*, ScrollbarPart, const IntRect&);
56 
57     IntRect buttonRect(ScrollbarPart);
58     IntRect trackRect(int startLength, int endLength);
59     IntRect trackPieceRectWithMargins(ScrollbarPart, const IntRect&);
60 
61     int minimumThumbLength();
62 
isOverlayScrollbar()63     virtual bool isOverlayScrollbar() const { return false; }
64 
65 private:
66     virtual void setParent(ScrollView*);
67     virtual void setEnabled(bool);
68 
69     virtual void paint(GraphicsContext*, const IntRect& damageRect);
70 
71     virtual void setHoveredPart(ScrollbarPart);
72     virtual void setPressedPart(ScrollbarPart);
73 
74     virtual void styleChanged();
75 
isCustomScrollbar()76     virtual bool isCustomScrollbar() const { return true; }
77 
78     void updateScrollbarParts(bool destroy = false);
79 
80     PassRefPtr<RenderStyle> getScrollbarPseudoStyle(ScrollbarPart, PseudoId);
81     void updateScrollbarPart(ScrollbarPart, bool destroy = false);
82 
83     RenderBox* m_owner;
84     Frame* m_owningFrame;
85     HashMap<unsigned, RenderScrollbarPart*> m_parts;
86 };
87 
toRenderScrollbar(Scrollbar * scrollbar)88 inline RenderScrollbar* toRenderScrollbar(Scrollbar* scrollbar)
89 {
90     ASSERT(!scrollbar || scrollbar->isCustomScrollbar());
91     return static_cast<RenderScrollbar*>(scrollbar);
92 }
93 
94 // This will catch anyone doing an unnecessary cast.
95 void toRenderScrollbar(const RenderScrollbar*);
96 
97 } // namespace WebCore
98 
99 #endif // RenderScrollbar_h
100