1/*
2 * Copyright (C) 2008 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 RenderScrollbarPart_h
27#define RenderScrollbarPart_h
28
29#include "RenderBlock.h"
30#include "ScrollTypes.h"
31
32namespace WebCore {
33
34class RenderScrollbar;
35
36class RenderScrollbarPart : public RenderBlock {
37public:
38    RenderScrollbarPart(Node*, RenderScrollbar* = 0, ScrollbarPart = NoPart);
39    virtual ~RenderScrollbarPart();
40
41    virtual const char* renderName() const { return "RenderScrollbarPart"; }
42
43    virtual bool requiresLayer() const { return false; }
44
45    virtual void layout();
46    virtual void calcPrefWidths();
47
48    void paintIntoRect(GraphicsContext*, int tx, int ty, const IntRect&);
49
50protected:
51    virtual void styleWillChange(StyleDifference diff, const RenderStyle* newStyle);
52    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
53    virtual void imageChanged(WrappedImagePtr, const IntRect* = 0);
54
55private:
56    void layoutHorizontalPart();
57    void layoutVerticalPart();
58
59    void computeScrollbarWidth();
60    void computeScrollbarHeight();
61
62    RenderScrollbar* m_scrollbar;
63    ScrollbarPart m_part;
64};
65
66} // namespace WebCore
67
68#endif // RenderScrollbarPart_h
69