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#include "config.h" 27 28#if ENABLE(MATHML) 29 30#include "RenderMathMLUnderOver.h" 31 32#include "MathMLElement.h" 33#include "MathMLNames.h" 34#include "RenderIterator.h" 35#include "RenderMathMLOperator.h" 36 37namespace WebCore { 38 39using namespace MathMLNames; 40 41RenderMathMLUnderOver::RenderMathMLUnderOver(Element& element, PassRef<RenderStyle> style) 42 : RenderMathMLBlock(element, WTF::move(style)) 43{ 44 // Determine what kind of under/over expression we have by element name 45 if (element.hasTagName(MathMLNames::munderTag)) 46 m_kind = Under; 47 else if (element.hasTagName(MathMLNames::moverTag)) 48 m_kind = Over; 49 else { 50 ASSERT(element.hasTagName(MathMLNames::munderoverTag)); 51 m_kind = UnderOver; 52 } 53} 54 55RenderMathMLOperator* RenderMathMLUnderOver::unembellishedOperator() 56{ 57 RenderObject* base = firstChild(); 58 if (!base || !base->isRenderMathMLBlock()) 59 return 0; 60 return toRenderMathMLBlock(base)->unembellishedOperator(); 61} 62 63int RenderMathMLUnderOver::firstLineBaseline() const 64{ 65 RenderBox* base = firstChildBox(); 66 if (!base) 67 return -1; 68 LayoutUnit baseline = base->firstLineBaseline(); 69 if (baseline != -1) 70 baseline += base->logicalTop(); 71 return baseline; 72} 73 74void RenderMathMLUnderOver::layout() 75{ 76 LayoutUnit stretchWidth = 0; 77 for (RenderObject* child = firstChild(); child; child = child->nextSibling()) { 78 if (child->needsLayout()) 79 toRenderElement(child)->layout(); 80 // Skipping the embellished op does not work for nested structures like 81 // <munder><mover><mo>_</mo>...</mover> <mo>_</mo></munder>. 82 if (child->isBox()) 83 stretchWidth = std::max<LayoutUnit>(stretchWidth, toRenderBox(child)->logicalWidth()); 84 } 85 86 // Set the sizes of (possibly embellished) stretchy operator children. 87 for (auto& child : childrenOfType<RenderMathMLBlock>(*this)) { 88 if (auto renderOperator = child.unembellishedOperator()) 89 renderOperator->stretchTo(stretchWidth); 90 } 91 92 RenderMathMLBlock::layout(); 93} 94 95} 96 97#endif // ENABLE(MATHML) 98