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