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 "core/rendering/style/RenderStyleConstants.h" 30 #include "platform/scroll/Scrollbar.h" 31 #include "wtf/HashMap.h" 32 33 namespace WebCore { 34 35 class LocalFrame; 36 class Node; 37 class RenderBox; 38 class RenderScrollbarPart; 39 class RenderStyle; 40 41 class RenderScrollbar FINAL : public Scrollbar { 42 protected: 43 RenderScrollbar(ScrollableArea*, ScrollbarOrientation, Node*, LocalFrame*); 44 45 public: 46 friend class Scrollbar; 47 static PassRefPtr<Scrollbar> createCustomScrollbar(ScrollableArea*, ScrollbarOrientation, Node*, LocalFrame* 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 OVERRIDE { return false; } 61 62 private: 63 virtual void setParent(Widget*) OVERRIDE; 64 virtual void setEnabled(bool) OVERRIDE; 65 66 virtual void paint(GraphicsContext*, const IntRect& damageRect) OVERRIDE; 67 68 virtual void setHoveredPart(ScrollbarPart) OVERRIDE; 69 virtual void setPressedPart(ScrollbarPart) OVERRIDE; 70 71 virtual void styleChanged() OVERRIDE; 72 73 virtual bool isCustomScrollbar() const OVERRIDE { 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 RefPtrWillBePersistent<Node> m_owner; 85 86 LocalFrame* m_owningFrame; 87 HashMap<unsigned, RenderScrollbarPart*> m_parts; 88 }; 89 90 DEFINE_TYPE_CASTS(RenderScrollbar, ScrollbarThemeClient, scrollbar, scrollbar->isCustomScrollbar(), scrollbar.isCustomScrollbar()); 91 92 } // namespace WebCore 93 94 #endif // RenderScrollbar_h 95
