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 ScrollbarTheme_h 27#define ScrollbarTheme_h 28 29#include "GraphicsContext.h" 30#include "IntRect.h" 31#include "ScrollTypes.h" 32 33namespace WebCore { 34 35class PlatformMouseEvent; 36class ScrollbarThemeClient; 37class ScrollView; 38 39#if USE(ACCELERATED_COMPOSITING) && ENABLE(RUBBER_BANDING) 40class GraphicsLayer; 41#endif 42 43class ScrollbarTheme { 44 WTF_MAKE_NONCOPYABLE(ScrollbarTheme); WTF_MAKE_FAST_ALLOCATED; 45public: 46 ScrollbarTheme() { } 47 virtual ~ScrollbarTheme() {}; 48 49 virtual void updateEnabledState(ScrollbarThemeClient*) { }; 50 51 virtual bool paint(ScrollbarThemeClient*, GraphicsContext*, const IntRect& /*damageRect*/) { return false; } 52 virtual ScrollbarPart hitTest(ScrollbarThemeClient*, const IntPoint&) { return NoPart; } 53 54 virtual int scrollbarThickness(ScrollbarControlSize = RegularScrollbar) { return 0; } 55 56 virtual ScrollbarButtonsPlacement buttonsPlacement() const { return ScrollbarButtonsSingle; } 57 58 virtual bool supportsControlTints() const { return false; } 59 virtual bool usesOverlayScrollbars() const { return false; } 60 virtual void updateScrollbarOverlayStyle(ScrollbarThemeClient*) { } 61 62 virtual void themeChanged() {} 63 64 virtual bool invalidateOnMouseEnterExit() { return false; } 65 66 void invalidateParts(ScrollbarThemeClient* scrollbar, ScrollbarControlPartMask mask) 67 { 68 if (mask & BackButtonStartPart) 69 invalidatePart(scrollbar, BackButtonStartPart); 70 if (mask & ForwardButtonStartPart) 71 invalidatePart(scrollbar, ForwardButtonStartPart); 72 if (mask & BackTrackPart) 73 invalidatePart(scrollbar, BackTrackPart); 74 if (mask & ThumbPart) 75 invalidatePart(scrollbar, ThumbPart); 76 if (mask & ForwardTrackPart) 77 invalidatePart(scrollbar, ForwardTrackPart); 78 if (mask & BackButtonEndPart) 79 invalidatePart(scrollbar, BackButtonEndPart); 80 if (mask & ForwardButtonEndPart) 81 invalidatePart(scrollbar, ForwardButtonEndPart); 82 } 83 84 virtual void invalidatePart(ScrollbarThemeClient*, ScrollbarPart) { } 85 86 virtual void paintScrollCorner(ScrollView*, GraphicsContext* context, const IntRect& cornerRect) { defaultPaintScrollCorner(context, cornerRect); } 87 static void defaultPaintScrollCorner(GraphicsContext* context, const IntRect& cornerRect) { context->fillRect(cornerRect, Color::white, ColorSpaceDeviceRGB); } 88 89 virtual void paintTickmarks(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) { } 90 virtual void paintOverhangAreas(ScrollView*, GraphicsContext*, const IntRect&, const IntRect&, const IntRect&) { } 91 92#if USE(ACCELERATED_COMPOSITING) && ENABLE(RUBBER_BANDING) 93 virtual void setUpOverhangAreasLayerContents(GraphicsLayer*, const Color&) { } 94 virtual void setUpContentShadowLayer(GraphicsLayer*) { } 95#endif 96 97 virtual bool shouldCenterOnThumb(ScrollbarThemeClient*, const PlatformMouseEvent&) { return false; } 98 virtual bool shouldSnapBackToDragOrigin(ScrollbarThemeClient*, const PlatformMouseEvent&) { return false; } 99 virtual bool shouldDragDocumentInsteadOfThumb(ScrollbarThemeClient*, const PlatformMouseEvent&) { return false; } 100 virtual int thumbPosition(ScrollbarThemeClient*) { return 0; } // The position of the thumb relative to the track. 101 virtual int thumbLength(ScrollbarThemeClient*) { return 0; } // The length of the thumb along the axis of the scrollbar. 102 virtual int trackPosition(ScrollbarThemeClient*) { return 0; } // The position of the track relative to the scrollbar. 103 virtual int trackLength(ScrollbarThemeClient*) { return 0; } // The length of the track along the axis of the scrollbar. 104 105 virtual int maxOverlapBetweenPages() { return std::numeric_limits<int>::max(); } 106 107 virtual double initialAutoscrollTimerDelay() { return 0.25; } 108 virtual double autoscrollTimerDelay() { return 0.05; } 109 110 virtual void registerScrollbar(ScrollbarThemeClient*) { } 111 virtual void unregisterScrollbar(ScrollbarThemeClient*) { } 112 113 virtual bool isMockTheme() const { return false; } 114 115 static ScrollbarTheme* theme(); 116 117private: 118 static ScrollbarTheme* nativeTheme(); // Must be implemented to return the correct theme subclass. 119}; 120 121} 122#endif 123