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/*
* Copyright (C) 2009 Alex Milowski (alex@milowski.com). All rights reserved.
* Copyright (C) 2010 François Sausset (sausset@gmail.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 "RenderMathMLFraction.h"
#include "GraphicsContext.h"
#include "MathMLNames.h"
#include "RenderText.h"
namespace WebCore {
using namespace MathMLNames;
static const double gHorizontalPad = 0.2;
static const int gLineThin = 1;
static const int gLineMedium = 3;
static const int gLineThick = 5;
static const double gFractionAlignment = 0.25;
static const double gFractionBarWidth = 0.05;
static const double gDenominatorPad = 0.1;
RenderMathMLFraction::RenderMathMLFraction(Element* fraction)
: RenderMathMLBlock(fraction)
, m_lineThickness(gLineThin)
{
setChildrenInline(false);
}
void RenderMathMLFraction::updateFromElement()
{
// FIXME: mfrac where bevelled=true will need to reorganize the descendants
if (isEmpty())
return;
Element* fraction = static_cast<Element*>(node());
RenderObject* numerator = firstChild();
String nalign = fraction->getAttribute(MathMLNames::numalignAttr);
if (equalIgnoringCase(nalign, "left"))
numerator->style()->setTextAlign(LEFT);
else if (equalIgnoringCase(nalign, "right"))
numerator->style()->setTextAlign(RIGHT);
else
numerator->style()->setTextAlign(CENTER);
RenderObject* denominator = numerator->nextSibling();
if (!denominator)
return;
String dalign = fraction->getAttribute(MathMLNames::denomalignAttr);
if (equalIgnoringCase(dalign, "left"))
denominator->style()->setTextAlign(LEFT);
else if (equalIgnoringCase(dalign, "right"))
denominator->style()->setTextAlign(RIGHT);
else
denominator->style()->setTextAlign(CENTER);
// FIXME: parse units
String thickness = fraction->getAttribute(MathMLNames::linethicknessAttr);
m_lineThickness = gLineThin;
if (equalIgnoringCase(thickness, "thin"))
m_lineThickness = gLineThin;
else if (equalIgnoringCase(thickness, "medium"))
m_lineThickness = gLineMedium;
else if (equalIgnoringCase(thickness, "thick"))
m_lineThickness = gLineThick;
else if (equalIgnoringCase(thickness, "0"))
m_lineThickness = 0;
// Update the style for the padding of the denominator for the line thickness
lastChild()->style()->setPaddingTop(Length(static_cast<int>(m_lineThickness + style()->fontSize() * gDenominatorPad), Fixed));
}
void RenderMathMLFraction::addChild(RenderObject* child, RenderObject* beforeChild)
{
RenderBlock* row = new (renderArena()) RenderMathMLBlock(node());
RefPtr<RenderStyle> rowStyle = makeBlockStyle();
rowStyle->setTextAlign(CENTER);
Length pad(static_cast<int>(rowStyle->fontSize() * gHorizontalPad), Fixed);
rowStyle->setPaddingLeft(pad);
rowStyle->setPaddingRight(pad);
// Only add padding for rows as denominators
bool isNumerator = isEmpty();
if (!isNumerator)
rowStyle->setPaddingTop(Length(2, Fixed));
row->setStyle(rowStyle.release());
RenderBlock::addChild(row, beforeChild);
row->addChild(child);
updateFromElement();
}
void RenderMathMLFraction::layout()
{
updateFromElement();
// Adjust the fraction line thickness for the zoom
if (lastChild() && lastChild()->isRenderBlock())
m_lineThickness = static_cast<int>(m_lineThickness * ceil(gFractionBarWidth * style()->fontSize()));
RenderBlock::layout();
// The row layout can affect the numerator/denominator width.
// FIXME: This is probably only needed if one of the children
// contains an mrow.
setNeedsLayoutAndPrefWidthsRecalc();
markContainingBlocksForLayout();
RenderBlock::layout();
}
void RenderMathMLFraction::paint(PaintInfo& info, int tx, int ty)
{
RenderMathMLBlock::paint(info, tx, ty);
if (info.context->paintingDisabled() || info.phase != PaintPhaseForeground)
return;
if (!firstChild() ||!m_lineThickness)
return;
int verticalOffset = 0;
// The children are always RenderMathMLBlock instances
if (firstChild()->isRenderMathMLBlock()) {
int adjustForThickness = m_lineThickness > 1 ? m_lineThickness / 2 : 1;
if (m_lineThickness % 2 == 1)
adjustForThickness++;
RenderMathMLBlock* numerator = toRenderMathMLBlock(firstChild());
if (numerator->isRenderMathMLRow())
verticalOffset = numerator->offsetHeight() + adjustForThickness;
else
verticalOffset = numerator->offsetHeight();
}
tx += x();
ty += y() + verticalOffset;
info.context->save();
info.context->setStrokeThickness(static_cast<float>(m_lineThickness));
info.context->setStrokeStyle(SolidStroke);
info.context->setStrokeColor(style()->visitedDependentColor(CSSPropertyColor), sRGBColorSpace);
info.context->drawLine(IntPoint(tx, ty), IntPoint(tx + offsetWidth(), ty));
info.context->restore();
}
int RenderMathMLFraction::baselinePosition(bool firstLine, bool isRootLineBox) const
{
if (firstChild() && firstChild()->isRenderMathMLBlock()) {
RenderMathMLBlock* numerator = toRenderMathMLBlock(firstChild());
// FIXME: the baseline should adjust so the fraction line aligns
// relative certain operators (e.g. aligns with the horizontal
// stroke of the plus). 1/3 of the current font size is just
// a good guess.
return numerator->offsetHeight() + style()->fontSize() / 3;
}
return RenderBlock::baselinePosition(firstLine, isRootLineBox);
}
}
#endif // ENABLE(MATHML)
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