2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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
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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
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23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 #ifndef ScrollbarTheme_h
27 #define ScrollbarTheme_h
29 #include "GraphicsContext.h"
31 #include "ScrollTypes.h"
35 class PlatformMouseEvent;
39 class ScrollbarTheme {
40 WTF_MAKE_NONCOPYABLE(ScrollbarTheme); WTF_MAKE_FAST_ALLOCATED;
43 virtual ~ScrollbarTheme() {};
45 virtual void updateEnabledState(Scrollbar*) { };
47 virtual bool paint(Scrollbar*, GraphicsContext*, const IntRect& /*damageRect*/) { return false; }
48 virtual ScrollbarPart hitTest(Scrollbar*, const PlatformMouseEvent&) { return NoPart; }
50 virtual int scrollbarThickness(ScrollbarControlSize = RegularScrollbar) { return 0; }
52 virtual ScrollbarButtonsPlacement buttonsPlacement() const { return ScrollbarButtonsSingle; }
54 virtual bool supportsControlTints() const { return false; }
55 virtual bool usesOverlayScrollbars() const { return false; }
56 virtual void updateScrollbarOverlayStyle(Scrollbar*) { }
58 virtual void themeChanged() {}
60 virtual bool invalidateOnMouseEnterExit() { return false; }
62 void invalidateParts(Scrollbar* scrollbar, ScrollbarControlPartMask mask)
64 if (mask & BackButtonStartPart)
65 invalidatePart(scrollbar, BackButtonStartPart);
66 if (mask & ForwardButtonStartPart)
67 invalidatePart(scrollbar, ForwardButtonStartPart);
68 if (mask & BackTrackPart)
69 invalidatePart(scrollbar, BackTrackPart);
71 invalidatePart(scrollbar, ThumbPart);
72 if (mask & ForwardTrackPart)
73 invalidatePart(scrollbar, ForwardTrackPart);
74 if (mask & BackButtonEndPart)
75 invalidatePart(scrollbar, BackButtonEndPart);
76 if (mask & ForwardButtonEndPart)
77 invalidatePart(scrollbar, ForwardButtonEndPart);
80 virtual void invalidatePart(Scrollbar*, ScrollbarPart) {}
82 virtual void paintScrollCorner(ScrollView*, GraphicsContext* context, const IntRect& cornerRect) { defaultPaintScrollCorner(context, cornerRect); }
83 static void defaultPaintScrollCorner(GraphicsContext* context, const IntRect& cornerRect) { context->fillRect(cornerRect, Color::white, ColorSpaceDeviceRGB); }
85 virtual void paintOverhangAreas(ScrollView*, GraphicsContext*, const IntRect&, const IntRect&, const IntRect&) { }
87 virtual bool shouldCenterOnThumb(Scrollbar*, const PlatformMouseEvent&) { return false; }
88 virtual bool shouldSnapBackToDragOrigin(Scrollbar*, const PlatformMouseEvent&) { return false; }
89 virtual bool shouldDragDocumentInsteadOfThumb(Scrollbar*, const PlatformMouseEvent&) { return false; }
90 virtual int thumbPosition(Scrollbar*) { return 0; } // The position of the thumb relative to the track.
91 virtual int thumbLength(Scrollbar*) { return 0; } // The length of the thumb along the axis of the scrollbar.
92 virtual int trackPosition(Scrollbar*) { return 0; } // The position of the track relative to the scrollbar.
93 virtual int trackLength(Scrollbar*) { return 0; } // The length of the track along the axis of the scrollbar.
95 virtual int maxOverlapBetweenPages() { return std::numeric_limits<int>::max(); }
97 virtual double initialAutoscrollTimerDelay() { return 0.25; }
98 virtual double autoscrollTimerDelay() { return 0.05; }
100 virtual void registerScrollbar(Scrollbar*) {}
101 virtual void unregisterScrollbar(Scrollbar*) {}
103 static ScrollbarTheme* nativeTheme(); // Must be implemented to return the correct theme subclass.