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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 RenderScrollbarTheme_h
27 #define RenderScrollbarTheme_h
28 
29 #include "ScrollbarThemeComposite.h"
30 
31 namespace WebCore {
32 
33 class PlatformMouseEvent;
34 class Scrollbar;
35 class ScrollView;
36 
37 class RenderScrollbarTheme : public ScrollbarThemeComposite {
38 public:
~RenderScrollbarTheme()39     virtual ~RenderScrollbarTheme() {};
40 
scrollbarThickness(ScrollbarControlSize controlSize)41     virtual int scrollbarThickness(ScrollbarControlSize controlSize) { return ScrollbarTheme::nativeTheme()->scrollbarThickness(controlSize); }
42 
buttonsPlacement()43     virtual ScrollbarButtonsPlacement buttonsPlacement() const { return ScrollbarTheme::nativeTheme()->buttonsPlacement(); }
44 
supportsControlTints()45     virtual bool supportsControlTints() const { return true; }
46 
47     virtual void paintScrollCorner(ScrollView*, GraphicsContext* context, const IntRect& cornerRect);
48 
shouldCenterOnThumb(Scrollbar * scrollbar,const PlatformMouseEvent & event)49     virtual bool shouldCenterOnThumb(Scrollbar* scrollbar, const PlatformMouseEvent& event) { return ScrollbarTheme::nativeTheme()->shouldCenterOnThumb(scrollbar, event); }
50 
initialAutoscrollTimerDelay()51     virtual double initialAutoscrollTimerDelay() { return ScrollbarTheme::nativeTheme()->initialAutoscrollTimerDelay(); }
autoscrollTimerDelay()52     virtual double autoscrollTimerDelay() { return ScrollbarTheme::nativeTheme()->autoscrollTimerDelay(); }
53 
registerScrollbar(Scrollbar * scrollbar)54     virtual void registerScrollbar(Scrollbar* scrollbar) { return ScrollbarTheme::nativeTheme()->registerScrollbar(scrollbar); }
unregisterScrollbar(Scrollbar * scrollbar)55     virtual void unregisterScrollbar(Scrollbar* scrollbar) { return ScrollbarTheme::nativeTheme()->unregisterScrollbar(scrollbar); }
56 
57     virtual int minimumThumbLength(Scrollbar*);
58 
59     void buttonSizesAlongTrackAxis(Scrollbar* scrollbar, int& beforeSize, int& afterSize);
60 
61     static RenderScrollbarTheme* renderScrollbarTheme();
62 
63 protected:
64     virtual bool hasButtons(Scrollbar*);
65     virtual bool hasThumb(Scrollbar*);
66 
67     virtual IntRect backButtonRect(Scrollbar*, ScrollbarPart, bool painting = false);
68     virtual IntRect forwardButtonRect(Scrollbar*, ScrollbarPart, bool painting = false);
69     virtual IntRect trackRect(Scrollbar*, bool painting = false);
70 
71     virtual void paintScrollbarBackground(GraphicsContext*, Scrollbar*);
72     virtual void paintTrackBackground(GraphicsContext*, Scrollbar*, const IntRect&);
73     virtual void paintTrackPiece(GraphicsContext*, Scrollbar*, const IntRect&, ScrollbarPart);
74     virtual void paintButton(GraphicsContext*, Scrollbar*, const IntRect&, ScrollbarPart);
75     virtual void paintThumb(GraphicsContext*, Scrollbar*, const IntRect&);
76 
77     virtual IntRect constrainTrackRectToTrackPieces(Scrollbar*, const IntRect&);
78 };
79 
80 } // namespace WebCore
81 
82 #endif // RenderScrollbarTheme_h
83