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 "platform/PlatformExport.h" 30 #include "platform/geometry/IntRect.h" 31 #include "platform/scroll/ScrollTypes.h" 32 33 namespace blink { 34 35 class GraphicsContext; 36 class PlatformMouseEvent; 37 class ScrollbarThemeClient; 38 39 class PLATFORM_EXPORT ScrollbarTheme { 40 WTF_MAKE_NONCOPYABLE(ScrollbarTheme); WTF_MAKE_FAST_ALLOCATED; 41 public: ScrollbarTheme()42 ScrollbarTheme() { } ~ScrollbarTheme()43 virtual ~ScrollbarTheme() { } 44 updateEnabledState(ScrollbarThemeClient *)45 virtual void updateEnabledState(ScrollbarThemeClient*) { } 46 47 virtual bool paint(ScrollbarThemeClient*, GraphicsContext*, const IntRect& damageRect); 48 virtual ScrollbarPart hitTest(ScrollbarThemeClient*, const IntPoint&); 49 50 virtual int scrollbarThickness(ScrollbarControlSize = RegularScrollbar) { return 0; } 51 buttonsPlacement()52 virtual ScrollbarButtonsPlacement buttonsPlacement() const { return ScrollbarButtonsSingle; } 53 supportsControlTints()54 virtual bool supportsControlTints() const { return false; } usesOverlayScrollbars()55 virtual bool usesOverlayScrollbars() const { return false; } updateScrollbarOverlayStyle(ScrollbarThemeClient *)56 virtual void updateScrollbarOverlayStyle(ScrollbarThemeClient*) { } 57 invalidateOnMouseEnterExit()58 virtual bool invalidateOnMouseEnterExit() { return false; } 59 invalidateParts(ScrollbarThemeClient * scrollbar,ScrollbarControlPartMask mask)60 void invalidateParts(ScrollbarThemeClient* scrollbar, ScrollbarControlPartMask mask) 61 { 62 if (mask & BackButtonStartPart) 63 invalidatePart(scrollbar, BackButtonStartPart); 64 if (mask & ForwardButtonStartPart) 65 invalidatePart(scrollbar, ForwardButtonStartPart); 66 if (mask & BackTrackPart) 67 invalidatePart(scrollbar, BackTrackPart); 68 if (mask & ThumbPart) 69 invalidatePart(scrollbar, ThumbPart); 70 if (mask & ForwardTrackPart) 71 invalidatePart(scrollbar, ForwardTrackPart); 72 if (mask & BackButtonEndPart) 73 invalidatePart(scrollbar, BackButtonEndPart); 74 if (mask & ForwardButtonEndPart) 75 invalidatePart(scrollbar, ForwardButtonEndPart); 76 } 77 78 virtual void invalidatePart(ScrollbarThemeClient*, ScrollbarPart); 79 80 virtual void paintScrollCorner(GraphicsContext*, const IntRect& cornerRect); 81 paintTickmarks(GraphicsContext *,ScrollbarThemeClient *,const IntRect &)82 virtual void paintTickmarks(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) { } 83 virtual void paintOverhangBackground(GraphicsContext*, const IntRect&, const IntRect&, const IntRect&); paintOverhangShadows(GraphicsContext *,const IntSize &,const IntRect &,const IntRect &,const IntRect &)84 virtual void paintOverhangShadows(GraphicsContext*, const IntSize&, const IntRect&, const IntRect&, const IntRect&) { } 85 86 virtual bool shouldCenterOnThumb(ScrollbarThemeClient*, const PlatformMouseEvent&); 87 virtual bool shouldSnapBackToDragOrigin(ScrollbarThemeClient*, const PlatformMouseEvent&); shouldDragDocumentInsteadOfThumb(ScrollbarThemeClient *,const PlatformMouseEvent &)88 virtual bool shouldDragDocumentInsteadOfThumb(ScrollbarThemeClient*, const PlatformMouseEvent&) { return false; } 89 90 // The position of the thumb relative to the track. 91 virtual int thumbPosition(ScrollbarThemeClient*); 92 // The length of the thumb along the axis of the scrollbar. 93 virtual int thumbLength(ScrollbarThemeClient*); 94 // The position of the track relative to the scrollbar. 95 virtual int trackPosition(ScrollbarThemeClient*); 96 // The length of the track along the axis of the scrollbar. 97 virtual int trackLength(ScrollbarThemeClient*); 98 99 virtual bool hasButtons(ScrollbarThemeClient*) = 0; 100 virtual bool hasThumb(ScrollbarThemeClient*) = 0; 101 102 virtual IntRect backButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool painting = false) = 0; 103 virtual IntRect forwardButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool painting = false) = 0; 104 virtual IntRect trackRect(ScrollbarThemeClient*, bool painting = false) = 0; 105 virtual IntRect thumbRect(ScrollbarThemeClient*); 106 virtual int thumbThickness(ScrollbarThemeClient*); 107 108 virtual int minimumThumbLength(ScrollbarThemeClient*); 109 110 virtual void splitTrack(ScrollbarThemeClient*, const IntRect& track, IntRect& startTrack, IntRect& thumb, IntRect& endTrack); 111 paintScrollbarBackground(GraphicsContext *,ScrollbarThemeClient *)112 virtual void paintScrollbarBackground(GraphicsContext*, ScrollbarThemeClient*) { } paintTrackBackground(GraphicsContext *,ScrollbarThemeClient *,const IntRect &)113 virtual void paintTrackBackground(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) { } paintTrackPiece(GraphicsContext *,ScrollbarThemeClient *,const IntRect &,ScrollbarPart)114 virtual void paintTrackPiece(GraphicsContext*, ScrollbarThemeClient*, const IntRect&, ScrollbarPart) { } paintButton(GraphicsContext *,ScrollbarThemeClient *,const IntRect &,ScrollbarPart)115 virtual void paintButton(GraphicsContext*, ScrollbarThemeClient*, const IntRect&, ScrollbarPart) { } paintThumb(GraphicsContext *,ScrollbarThemeClient *,const IntRect &)116 virtual void paintThumb(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) { } 117 maxOverlapBetweenPages()118 virtual int maxOverlapBetweenPages() { return std::numeric_limits<int>::max(); } 119 initialAutoscrollTimerDelay()120 virtual double initialAutoscrollTimerDelay() { return 0.25; } autoscrollTimerDelay()121 virtual double autoscrollTimerDelay() { return 0.05; } 122 constrainTrackRectToTrackPieces(ScrollbarThemeClient *,const IntRect & rect)123 virtual IntRect constrainTrackRectToTrackPieces(ScrollbarThemeClient*, const IntRect& rect) { return rect; } 124 registerScrollbar(ScrollbarThemeClient *)125 virtual void registerScrollbar(ScrollbarThemeClient*) { } unregisterScrollbar(ScrollbarThemeClient *)126 virtual void unregisterScrollbar(ScrollbarThemeClient*) { } 127 isMockTheme()128 virtual bool isMockTheme() const { return false; } 129 130 static ScrollbarTheme* theme(); 131 132 static void setMockScrollbarsEnabled(bool flag); 133 static bool mockScrollbarsEnabled(); 134 135 private: 136 static ScrollbarTheme* nativeTheme(); // Must be implemented to return the correct theme subclass. 137 static bool gMockScrollbarsEnabled; 138 }; 139 140 } 141 #endif 142