1/*
2 * Copyright (C) 2012 Google 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 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef WebScrollbarThemePainter_h
27#define WebScrollbarThemePainter_h
28
29#include "WebCanvas.h"
30
31namespace WebCore {
32class ScrollbarTheme;
33class Scrollbar;
34};
35
36namespace blink {
37
38class WebScrollbar;
39struct WebRect;
40
41class WebScrollbarThemePainter {
42public:
43    WebScrollbarThemePainter() : m_theme(0) { }
44    WebScrollbarThemePainter(const WebScrollbarThemePainter& painter) { assign(painter); }
45    virtual ~WebScrollbarThemePainter() { }
46    WebScrollbarThemePainter& operator=(const WebScrollbarThemePainter& painter)
47    {
48        assign(painter);
49        return *this;
50    }
51
52    BLINK_EXPORT void assign(const WebScrollbarThemePainter&);
53
54    BLINK_EXPORT void paintScrollbarBackground(WebCanvas*, const WebRect&);
55    BLINK_EXPORT void paintTrackBackground(WebCanvas*, const WebRect&);
56    BLINK_EXPORT void paintBackTrackPart(WebCanvas*, const WebRect&);
57    BLINK_EXPORT void paintForwardTrackPart(WebCanvas*, const WebRect&);
58    BLINK_EXPORT void paintBackButtonStart(WebCanvas*, const WebRect&);
59    BLINK_EXPORT void paintBackButtonEnd(WebCanvas*, const WebRect&);
60    BLINK_EXPORT void paintForwardButtonStart(WebCanvas*, const WebRect&);
61    BLINK_EXPORT void paintForwardButtonEnd(WebCanvas*, const WebRect&);
62    BLINK_EXPORT void paintTickmarks(WebCanvas*, const WebRect&);
63    BLINK_EXPORT void paintThumb(WebCanvas*, const WebRect&);
64
65#if BLINK_IMPLEMENTATION
66    WebScrollbarThemePainter(WebCore::ScrollbarTheme*, WebCore::Scrollbar*);
67#endif
68
69private:
70    // The theme is not owned by this class. It is assumed that the theme is a
71    // static pointer and its lifetime is essentially infinite. The functions
72    // called from the painter may not be thread-safe, so all calls must be made
73    // from the same thread that it is created on.
74    WebCore::ScrollbarTheme* m_theme;
75
76    // It is assumed that the constructor of this paint object is responsible
77    // for the lifetime of this scrollbar. The painter has to use the real
78    // scrollbar (and not a WebScrollbar wrapper) due to static_casts for
79    // RenderScrollbar and pointer-based HashMap lookups for Lion scrollbars.
80    WebCore::Scrollbar* m_scrollbar;
81};
82
83} // namespace blink
84
85#endif
86