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/*
* Copyright (C) 2010 Alex Milowski (alex@milowski.com). All rights reserved.
* Copyright (C) 2016 Igalia S.L.
*
* 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"
#include "RenderMathMLRow.h"
#if ENABLE(MATHML)
#include "MathMLNames.h"
#include "MathMLRowElement.h"
#include "RenderIterator.h"
#include "RenderMathMLOperator.h"
#include "RenderMathMLRoot.h"
namespace WebCore {
using namespace MathMLNames;
RenderMathMLRow::RenderMathMLRow(MathMLRowElement& element, RenderStyle&& style)
: RenderMathMLBlock(element, WTFMove(style))
{
}
MathMLRowElement& RenderMathMLRow::element() const
{
return static_cast<MathMLRowElement&>(nodeForNonAnonymous());
}
std::optional<int> RenderMathMLRow::firstLineBaseline() const
{
auto* baselineChild = firstChildBox();
if (!baselineChild)
return std::optional<int>();
return std::optional<int>(static_cast<int>(lroundf(ascentForChild(*baselineChild) + baselineChild->logicalTop())));
}
void RenderMathMLRow::computeLineVerticalStretch(LayoutUnit& ascent, LayoutUnit& descent)
{
for (auto* child = firstChildBox(); child; child = child->nextSiblingBox()) {
if (is<RenderMathMLBlock>(child)) {
auto* renderOperator = downcast<RenderMathMLBlock>(child)->unembellishedOperator();
if (renderOperator && renderOperator->isStretchy())
continue;
}
child->layoutIfNeeded();
LayoutUnit childHeightAboveBaseline = ascentForChild(*child);
LayoutUnit childDepthBelowBaseline = child->logicalHeight() - childHeightAboveBaseline;
ascent = std::max(ascent, childHeightAboveBaseline);
descent = std::max(descent, childDepthBelowBaseline);
}
// We ensure a minimal stretch size.
if (ascent + descent <= 0) {
ascent = style().computedFontPixelSize();
descent = 0;
}
}
void RenderMathMLRow::computePreferredLogicalWidths()
{
ASSERT(preferredLogicalWidthsDirty());
m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = 0;
LayoutUnit preferredWidth = 0;
for (auto* child = firstChildBox(); child; child = child->nextSiblingBox())
preferredWidth += child->maxPreferredLogicalWidth() + child->marginLogicalWidth();
m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = preferredWidth + borderAndPaddingLogicalWidth();
setPreferredLogicalWidthsDirty(false);
}
void RenderMathMLRow::layoutRowItems(LayoutUnit& ascent, LayoutUnit& descent)
{
// We first stretch the vertical operators.
// For inline formulas, we can then calculate the logical width.
LayoutUnit width = borderAndPaddingStart();
for (auto* child = firstChildBox(); child; child = child->nextSiblingBox()) {
if (child->isOutOfFlowPositioned())
continue;
if (is<RenderMathMLBlock>(child)) {
auto renderOperator = downcast<RenderMathMLBlock>(child)->unembellishedOperator();
if (renderOperator && renderOperator->isStretchy() && renderOperator->isVertical())
renderOperator->stretchTo(ascent, descent);
}
child->layoutIfNeeded();
width += child->marginStart() + child->logicalWidth() + child->marginEnd();
}
width += borderEnd() + paddingEnd();
if ((!isRenderMathMLMath() || style().display() == INLINE))
setLogicalWidth(width);
LayoutUnit verticalOffset = borderTop() + paddingTop();
LayoutUnit maxAscent = 0, maxDescent = 0; // Used baseline alignment.
LayoutUnit horizontalOffset = borderAndPaddingStart();
bool shouldFlipHorizontal = !style().isLeftToRightDirection();
for (auto* child = firstChildBox(); child; child = child->nextSiblingBox()) {
if (child->isOutOfFlowPositioned()) {
child->containingBlock()->insertPositionedObject(*child);
continue;
}
LayoutUnit childHorizontalExtent = child->logicalWidth();
LayoutUnit ascent = ascentForChild(*child);
LayoutUnit descent = child->verticalMarginExtent() + child->logicalHeight() - ascent;
maxAscent = std::max(maxAscent, ascent);
maxDescent = std::max(maxDescent, descent);
LayoutUnit childVerticalMarginBoxExtent = maxAscent + maxDescent;
horizontalOffset += child->marginStart();
setLogicalHeight(std::max(logicalHeight(), verticalOffset + borderBottom() + paddingBottom() + childVerticalMarginBoxExtent + horizontalScrollbarHeight()));
LayoutPoint childLocation(shouldFlipHorizontal ? logicalWidth() - horizontalOffset - childHorizontalExtent : horizontalOffset, verticalOffset + child->marginTop());
child->setLocation(childLocation);
horizontalOffset += childHorizontalExtent + child->marginEnd();
}
LayoutUnit centerBlockOffset = 0;
if (style().display() == BLOCK)
centerBlockOffset = std::max<LayoutUnit>(0, (logicalWidth() - (horizontalOffset + borderEnd() + paddingEnd())) / 2);
if (shouldFlipHorizontal && centerBlockOffset > 0)
centerBlockOffset = -centerBlockOffset;
for (auto* child = firstChildBox(); child; child = child->nextSiblingBox()) {
LayoutUnit ascent = ascentForChild(*child);
LayoutUnit startOffset = maxAscent - ascent;
child->setLocation(child->location() + LayoutPoint(centerBlockOffset, startOffset));
}
ascent = maxAscent;
descent = maxDescent;
}
void RenderMathMLRow::layoutBlock(bool relayoutChildren, LayoutUnit)
{
ASSERT(needsLayout());
if (!relayoutChildren && simplifiedLayout())
return;
LayoutUnit ascent = 0;
LayoutUnit descent = 0;
computeLineVerticalStretch(ascent, descent);
recomputeLogicalWidth();
setLogicalHeight(borderAndPaddingLogicalHeight() + scrollbarLogicalHeight());
layoutRowItems(ascent, descent);
updateLogicalHeight();
clearNeedsLayout();
}
}
#endif // ENABLE(MATHML)
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