1/* 2 * Copyright (C) 2008, 2009 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 RenderScrollbar_h 27#define RenderScrollbar_h 28 29#include "RenderStyleConstants.h" 30#include "Scrollbar.h" 31#include <wtf/HashMap.h> 32 33namespace WebCore { 34 35class Frame; 36class Node; 37class RenderBox; 38class RenderScrollbarPart; 39class RenderStyle; 40 41class RenderScrollbar : public Scrollbar { 42protected: 43 RenderScrollbar(ScrollableArea*, ScrollbarOrientation, Node*, Frame*); 44 45public: 46 friend class Scrollbar; 47 static PassRefPtr<Scrollbar> createCustomScrollbar(ScrollableArea*, ScrollbarOrientation, Node*, Frame* owningFrame = 0); 48 virtual ~RenderScrollbar(); 49 50 RenderBox* owningRenderer() const; 51 52 void paintPart(GraphicsContext*, ScrollbarPart, const IntRect&); 53 54 IntRect buttonRect(ScrollbarPart); 55 IntRect trackRect(int startLength, int endLength); 56 IntRect trackPieceRectWithMargins(ScrollbarPart, const IntRect&); 57 58 int minimumThumbLength(); 59 60 virtual bool isOverlayScrollbar() const { return false; } 61 62private: 63 virtual void setParent(ScrollView*); 64 virtual void setEnabled(bool); 65 66 virtual void paint(GraphicsContext*, const IntRect& damageRect); 67 68 virtual void setHoveredPart(ScrollbarPart); 69 virtual void setPressedPart(ScrollbarPart); 70 71 virtual void styleChanged(); 72 73 virtual bool isCustomScrollbar() const { return true; } 74 75 void updateScrollbarParts(bool destroy = false); 76 77 PassRefPtr<RenderStyle> getScrollbarPseudoStyle(ScrollbarPart, PseudoId); 78 void updateScrollbarPart(ScrollbarPart, bool destroy = false); 79 80 // This Scrollbar(Widget) may outlive the DOM which created it (during tear down), 81 // so we keep a reference to the Node which caused this custom scrollbar creation. 82 // This will not create a reference cycle as the Widget tree is owned by our containing 83 // FrameView which this Node pointer can in no way keep alive. See webkit bug 80610. 84 RefPtr<Node> m_owner; 85 86 Frame* m_owningFrame; 87 HashMap<unsigned, RenderScrollbarPart*> m_parts; 88}; 89 90inline RenderScrollbar* toRenderScrollbar(ScrollbarThemeClient* scrollbar) 91{ 92 ASSERT_WITH_SECURITY_IMPLICATION(!scrollbar || scrollbar->isCustomScrollbar()); 93 return static_cast<RenderScrollbar*>(scrollbar); 94} 95 96// This will catch anyone doing an unnecessary cast. 97void toRenderScrollbar(const RenderScrollbar*); 98 99} // namespace WebCore 100 101#endif // RenderScrollbar_h 102