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 "core/rendering/RenderBlock.h" 30 #include "platform/scroll/ScrollTypes.h" 31 32 namespace WebCore { 33 34 class RenderScrollbar; 35 36 class RenderScrollbarPart FINAL : public RenderBlock { 37 public: 38 static RenderScrollbarPart* createAnonymous(Document*, RenderScrollbar* = 0, ScrollbarPart = NoPart); 39 40 virtual ~RenderScrollbarPart(); 41 renderName()42 virtual const char* renderName() const OVERRIDE { return "RenderScrollbarPart"; } 43 layerTypeRequired()44 virtual LayerType layerTypeRequired() const OVERRIDE { return NoLayer; } 45 46 virtual void layout() OVERRIDE; 47 48 void paintIntoRect(GraphicsContext*, const LayoutPoint&, const LayoutRect&); 49 50 // Scrollbar parts needs to be rendered at device pixel boundaries. marginTop()51 virtual LayoutUnit marginTop() const OVERRIDE { ASSERT(isIntegerValue(m_marginBox.top())); return m_marginBox.top(); } marginBottom()52 virtual LayoutUnit marginBottom() const OVERRIDE { ASSERT(isIntegerValue(m_marginBox.bottom())); return m_marginBox.bottom(); } marginLeft()53 virtual LayoutUnit marginLeft() const OVERRIDE { ASSERT(isIntegerValue(m_marginBox.left())); return m_marginBox.left(); } marginRight()54 virtual LayoutUnit marginRight() const OVERRIDE { ASSERT(isIntegerValue(m_marginBox.right())); return m_marginBox.right(); } 55 isRenderScrollbarPart()56 virtual bool isRenderScrollbarPart() const OVERRIDE { return true; } 57 RenderObject* rendererOwningScrollbar() const; 58 59 protected: 60 virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) OVERRIDE; 61 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE; 62 virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) OVERRIDE; 63 64 private: 65 RenderScrollbarPart(RenderScrollbar*, ScrollbarPart); 66 67 virtual void computePreferredLogicalWidths() OVERRIDE; 68 69 // Have all padding getters return 0. The important point here is to avoid resolving percents 70 // against the containing block, since scroll bar corners don't always have one (so it would 71 // crash). Scroll bar corners are not actually laid out, and they don't have child content, so 72 // what we return here doesn't really matter. paddingTop()73 virtual LayoutUnit paddingTop() const OVERRIDE { return LayoutUnit(); } paddingBottom()74 virtual LayoutUnit paddingBottom() const OVERRIDE { return LayoutUnit(); } paddingLeft()75 virtual LayoutUnit paddingLeft() const OVERRIDE { return LayoutUnit(); } paddingRight()76 virtual LayoutUnit paddingRight() const OVERRIDE { return LayoutUnit(); } paddingBefore()77 virtual LayoutUnit paddingBefore() const OVERRIDE { return LayoutUnit(); } paddingAfter()78 virtual LayoutUnit paddingAfter() const OVERRIDE { return LayoutUnit(); } paddingStart()79 virtual LayoutUnit paddingStart() const OVERRIDE { return LayoutUnit(); } paddingEnd()80 virtual LayoutUnit paddingEnd() const OVERRIDE { return LayoutUnit(); } 81 82 void layoutHorizontalPart(); 83 void layoutVerticalPart(); 84 85 void computeScrollbarWidth(); 86 void computeScrollbarHeight(); 87 88 RenderScrollbar* m_scrollbar; 89 ScrollbarPart m_part; 90 }; 91 92 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderScrollbarPart, isRenderScrollbarPart()); 93 94 } // namespace WebCore 95 96 #endif // RenderScrollbarPart_h 97