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 RenderScrollbarPart_h 27#define RenderScrollbarPart_h 28 29#include "RenderBlock.h" 30#include "ScrollTypes.h" 31 32namespace WebCore { 33 34class RenderScrollbar; 35 36class RenderScrollbarPart : public RenderBlock { 37public: 38 static RenderScrollbarPart* createAnonymous(Document*, RenderScrollbar* = 0, ScrollbarPart = NoPart); 39 40 virtual ~RenderScrollbarPart(); 41 42 virtual const char* renderName() const { return "RenderScrollbarPart"; } 43 44 virtual bool requiresLayer() const { return false; } 45 46 virtual void layout(); 47 48 void paintIntoRect(GraphicsContext*, const LayoutPoint&, const LayoutRect&); 49 50 // Scrollbar parts needs to be rendered at device pixel boundaries. 51 virtual LayoutUnit marginTop() const OVERRIDE { ASSERT(isIntegerValue(m_marginBox.top())); return m_marginBox.top(); } 52 virtual LayoutUnit marginBottom() const OVERRIDE { ASSERT(isIntegerValue(m_marginBox.bottom())); return m_marginBox.bottom(); } 53 virtual LayoutUnit marginLeft() const OVERRIDE { ASSERT(isIntegerValue(m_marginBox.left())); return m_marginBox.left(); } 54 virtual LayoutUnit marginRight() const OVERRIDE { ASSERT(isIntegerValue(m_marginBox.right())); return m_marginBox.right(); } 55 56 virtual bool isRenderScrollbarPart() const { return true; } 57 RenderObject* rendererOwningScrollbar() const; 58 59protected: 60 virtual void styleWillChange(StyleDifference diff, const RenderStyle* newStyle); 61 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle); 62 virtual void imageChanged(WrappedImagePtr, const IntRect* = 0); 63 64private: 65 RenderScrollbarPart(RenderScrollbar*, ScrollbarPart); 66 67 virtual void computePreferredLogicalWidths(); 68 69 void layoutHorizontalPart(); 70 void layoutVerticalPart(); 71 72 void computeScrollbarWidth(); 73 void computeScrollbarHeight(); 74 75 RenderScrollbar* m_scrollbar; 76 ScrollbarPart m_part; 77}; 78 79inline RenderScrollbarPart* toRenderScrollbarPart(RenderObject* object) 80{ 81 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderScrollbarPart()); 82 return static_cast<RenderScrollbarPart*>(object); 83} 84 85inline const RenderScrollbarPart* toRenderScrollbarPart(const RenderObject* object) 86{ 87 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderScrollbarPart()); 88 return static_cast<const RenderScrollbarPart*>(object); 89} 90 91// This will catch anyone doing an unnecessary cast. 92void toRenderScrollbarPart(const RenderScrollbarPart*); 93 94} // namespace WebCore 95 96#endif // RenderScrollbarPart_h 97