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
33namespace WebCore {
34
35class RenderBox;
36class RenderScrollbarPart;
37class RenderStyle;
38
39class RenderScrollbar : public Scrollbar {
40protected:
41    RenderScrollbar(ScrollbarClient*, ScrollbarOrientation, RenderBox*);
42
43public:
44    friend class Scrollbar;
45    static PassRefPtr<Scrollbar> createCustomScrollbar(ScrollbarClient*, ScrollbarOrientation, RenderBox*);
46    virtual ~RenderScrollbar();
47
48    static ScrollbarPart partForStyleResolve();
49    static RenderScrollbar* scrollbarForStyleResolve();
50
51    RenderBox* owningRenderer() const { return m_owner; }
52
53    void paintPart(GraphicsContext*, ScrollbarPart, const IntRect&);
54
55    IntRect buttonRect(ScrollbarPart);
56    IntRect trackRect(int startLength, int endLength);
57    IntRect trackPieceRectWithMargins(ScrollbarPart, const IntRect&);
58
59    int minimumThumbLength();
60
61private:
62    virtual void setParent(ScrollView*);
63    virtual void setEnabled(bool);
64
65    virtual void paint(GraphicsContext*, const IntRect& damageRect);
66
67    virtual void setHoveredPart(ScrollbarPart);
68    virtual void setPressedPart(ScrollbarPart);
69
70    virtual void styleChanged();
71
72    virtual bool isCustomScrollbar() const { return true; }
73
74    void updateScrollbarParts(bool destroy = false);
75
76    PassRefPtr<RenderStyle> getScrollbarPseudoStyle(ScrollbarPart, PseudoId);
77    void updateScrollbarPart(ScrollbarPart, bool destroy = false);
78
79    RenderBox* m_owner;
80    HashMap<unsigned, RenderScrollbarPart*> m_parts;
81};
82
83inline RenderScrollbar* toRenderScrollbar(Scrollbar* scrollbar)
84{
85    ASSERT(!scrollbar || scrollbar->isCustomScrollbar());
86    return static_cast<RenderScrollbar*>(scrollbar);
87}
88
89// This will catch anyone doing an unnecessary cast.
90void toRenderScrollbar(const RenderScrollbar*);
91
92} // namespace WebCore
93
94#endif // RenderScrollbar_h
95