1/* 2 * Copyright (C) 2009 Alex Milowski (alex@milowski.com). 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS 14 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 15 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 16 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 17 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 19 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY 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 RenderMathMLRoot_h 27#define RenderMathMLRoot_h 28 29#if ENABLE(MATHML) 30 31#include "RenderMathMLBlock.h" 32#include "RenderMathMLRow.h" 33 34namespace WebCore { 35 36class RenderMathMLRadicalOperator; 37class RenderMathMLRootWrapper; 38 39// Render base^(1/index), or sqrt(base) via the derived class RenderMathMLSquareRoot, using radical notation. 40class RenderMathMLRoot : public RenderMathMLBlock { 41 42friend class RenderMathMLRootWrapper; 43 44public: 45 RenderMathMLRoot(Element&, PassRef<RenderStyle>); 46 RenderMathMLRoot(Document&, PassRef<RenderStyle>); 47 48 virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) override; 49 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override; 50 virtual void updateFromElement() override; 51 52protected: 53 virtual void layout() override; 54 55 virtual void paint(PaintInfo&, const LayoutPoint&) override; 56 57private: 58 virtual bool isRenderMathMLRoot() const override final { return true; } 59 virtual const char* renderName() const override { return "RenderMathMLRoot"; } 60 virtual int firstLineBaseline() const override; 61 void updateStyle(); 62 void restructureWrappers(); 63 64 RenderMathMLRootWrapper* baseWrapper() const; 65 RenderMathMLBlock* radicalWrapper() const; 66 RenderMathMLRootWrapper* indexWrapper() const; 67 RenderMathMLRadicalOperator* radicalOperator() const; 68 69 LayoutUnit m_verticalGap; 70 LayoutUnit m_ruleThickness; 71 LayoutUnit m_extraAscender; 72 float m_degreeBottomRaisePercent; 73}; 74 75RENDER_OBJECT_TYPE_CASTS(RenderMathMLRoot, isRenderMathMLRoot()) 76 77// These are specific wrappers for the index and base, that ask the parent to restructure the renderers after child removal. 78class RenderMathMLRootWrapper : public RenderMathMLRow { 79 80friend class RenderMathMLRoot; 81 82public: 83 RenderMathMLRootWrapper(Document& document, PassRef<RenderStyle> style) 84 : RenderMathMLRow(document, WTF::move(style)) { } 85 86private: 87 RenderObject* removeChildWithoutRestructuring(RenderObject&); 88 RenderObject* removeChild(RenderObject&) override; 89 static RenderPtr<RenderMathMLRootWrapper> createAnonymousWrapper(RenderMathMLRoot* renderObject); 90 virtual bool isRenderMathMLRootWrapper() const override final { return true; } 91 virtual const char* renderName() const override { return "RenderMathMLRootWrapper"; } 92}; 93 94RENDER_OBJECT_TYPE_CASTS(RenderMathMLRootWrapper, isRenderMathMLRootWrapper()) 95 96} 97 98#endif // ENABLE(MATHML) 99 100#endif // RenderMathMLRoot_h 101