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/*
* Copyright (C) 2009 Alex Milowski (alex@milowski.com). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(MATHML)
#include "RenderMathMLUnderOver.h"
#include "MathMLElement.h"
#include "MathMLNames.h"
#include "RenderIterator.h"
#include "RenderMathMLOperator.h"
namespace WebCore {
using namespace MathMLNames;
RenderMathMLUnderOver::RenderMathMLUnderOver(Element& element, Ref<RenderStyle>&& style)
: RenderMathMLBlock(element, WTFMove(style))
{
// Determine what kind of under/over expression we have by element name
if (element.hasTagName(MathMLNames::munderTag))
m_kind = Under;
else if (element.hasTagName(MathMLNames::moverTag))
m_kind = Over;
else {
ASSERT(element.hasTagName(MathMLNames::munderoverTag));
m_kind = UnderOver;
}
}
RenderMathMLOperator* RenderMathMLUnderOver::unembellishedOperator()
{
RenderObject* base = firstChild();
if (!is<RenderMathMLBlock>(base))
return nullptr;
return downcast<RenderMathMLBlock>(*base).unembellishedOperator();
}
Optional<int> RenderMathMLUnderOver::firstLineBaseline() const
{
RenderBox* base = firstChildBox();
if (!base)
return Optional<int>();
Optional<int> baseline = base->firstLineBaseline();
if (baseline)
baseline.value() += static_cast<int>(base->logicalTop());
return baseline;
}
void RenderMathMLUnderOver::layout()
{
LayoutUnit stretchWidth = 0;
Vector<RenderMathMLOperator*, 2> renderOperators;
for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
if (child->needsLayout()) {
if (is<RenderMathMLBlock>(child)) {
if (auto renderOperator = downcast<RenderMathMLBlock>(*child).unembellishedOperator()) {
if (!renderOperator->isVertical()) {
renderOperator->resetStretchSize();
renderOperators.append(renderOperator);
}
}
}
downcast<RenderElement>(*child).layout();
}
// Skipping the embellished op does not work for nested structures like
// <munder><mover><mo>_</mo>...</mover> <mo>_</mo></munder>.
if (is<RenderBox>(*child))
stretchWidth = std::max<LayoutUnit>(stretchWidth, downcast<RenderBox>(*child).logicalWidth());
}
// Set the sizes of (possibly embellished) stretchy operator children.
for (auto& renderOperator : renderOperators)
renderOperator->stretchTo(stretchWidth);
RenderMathMLBlock::layout();
}
}
#endif // ENABLE(MATHML)
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