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