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 33 namespace WebCore { 34 35 class PlatformMouseEvent; 36 class Scrollbar; 37 class ScrollView; 38 39 class ScrollbarTheme { 40 WTF_MAKE_NONCOPYABLE(ScrollbarTheme); WTF_MAKE_FAST_ALLOCATED; 41 public: ScrollbarTheme()42 ScrollbarTheme() { } ~ScrollbarTheme()43 virtual ~ScrollbarTheme() {}; 44 paint(Scrollbar *,GraphicsContext *,const IntRect &)45 virtual bool paint(Scrollbar*, GraphicsContext*, const IntRect& /*damageRect*/) { return false; } hitTest(Scrollbar *,const PlatformMouseEvent &)46 virtual ScrollbarPart hitTest(Scrollbar*, const PlatformMouseEvent&) { return NoPart; } 47 48 virtual int scrollbarThickness(ScrollbarControlSize = RegularScrollbar) { return 0; } 49 buttonsPlacement()50 virtual ScrollbarButtonsPlacement buttonsPlacement() const { return ScrollbarButtonsSingle; } 51 supportsControlTints()52 virtual bool supportsControlTints() const { return false; } usesOverlayScrollbars()53 virtual bool usesOverlayScrollbars() const { return false; } 54 themeChanged()55 virtual void themeChanged() {} 56 invalidateOnMouseEnterExit()57 virtual bool invalidateOnMouseEnterExit() { return false; } 58 invalidateParts(Scrollbar * scrollbar,ScrollbarControlPartMask mask)59 void invalidateParts(Scrollbar* scrollbar, ScrollbarControlPartMask mask) 60 { 61 if (mask & BackButtonStartPart) 62 invalidatePart(scrollbar, BackButtonStartPart); 63 if (mask & ForwardButtonStartPart) 64 invalidatePart(scrollbar, ForwardButtonStartPart); 65 if (mask & BackTrackPart) 66 invalidatePart(scrollbar, BackTrackPart); 67 if (mask & ThumbPart) 68 invalidatePart(scrollbar, ThumbPart); 69 if (mask & ForwardTrackPart) 70 invalidatePart(scrollbar, ForwardTrackPart); 71 if (mask & BackButtonEndPart) 72 invalidatePart(scrollbar, BackButtonEndPart); 73 if (mask & ForwardButtonEndPart) 74 invalidatePart(scrollbar, ForwardButtonEndPart); 75 } 76 invalidatePart(Scrollbar *,ScrollbarPart)77 virtual void invalidatePart(Scrollbar*, ScrollbarPart) {} 78 paintScrollCorner(ScrollView *,GraphicsContext * context,const IntRect & cornerRect)79 virtual void paintScrollCorner(ScrollView*, GraphicsContext* context, const IntRect& cornerRect) { defaultPaintScrollCorner(context, cornerRect); } defaultPaintScrollCorner(GraphicsContext * context,const IntRect & cornerRect)80 static void defaultPaintScrollCorner(GraphicsContext* context, const IntRect& cornerRect) { context->fillRect(cornerRect, Color::white, ColorSpaceDeviceRGB); } 81 shouldCenterOnThumb(Scrollbar *,const PlatformMouseEvent &)82 virtual bool shouldCenterOnThumb(Scrollbar*, const PlatformMouseEvent&) { return false; } shouldSnapBackToDragOrigin(Scrollbar *,const PlatformMouseEvent &)83 virtual bool shouldSnapBackToDragOrigin(Scrollbar*, const PlatformMouseEvent&) { return false; } thumbPosition(Scrollbar *)84 virtual int thumbPosition(Scrollbar*) { return 0; } // The position of the thumb relative to the track. thumbLength(Scrollbar *)85 virtual int thumbLength(Scrollbar*) { return 0; } // The length of the thumb along the axis of the scrollbar. trackPosition(Scrollbar *)86 virtual int trackPosition(Scrollbar*) { return 0; } // The position of the track relative to the scrollbar. trackLength(Scrollbar *)87 virtual int trackLength(Scrollbar*) { return 0; } // The length of the track along the axis of the scrollbar. 88 maxOverlapBetweenPages()89 virtual int maxOverlapBetweenPages() { return std::numeric_limits<int>::max(); } 90 initialAutoscrollTimerDelay()91 virtual double initialAutoscrollTimerDelay() { return 0.25; } autoscrollTimerDelay()92 virtual double autoscrollTimerDelay() { return 0.05; } 93 registerScrollbar(Scrollbar *)94 virtual void registerScrollbar(Scrollbar*) {} unregisterScrollbar(Scrollbar *)95 virtual void unregisterScrollbar(Scrollbar*) {} 96 97 static ScrollbarTheme* nativeTheme(); // Must be implemented to return the correct theme subclass. 98 }; 99 100 } 101 #endif 102