lyx_mirror/src/mathed/InsetMathFrac.cpp

/**
 * \file InsetMathFrac.cpp
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author Alejandro Aguilar Sierra
 * \author André Pönitz
 *
 * Full author contact details are available in file CREDITS.
 */

#include <config.h>

#include "InsetMathFrac.h"
#include "MathData.h"
#include "MathStream.h"
#include "TextPainter.h"
#include "LaTeXFeatures.h"
#include "Color.h"
#include "frontends/Painter.h"


namespace lyx {


using std::string;
using std::max;
using std::auto_ptr;


InsetMathFrac::InsetMathFrac(Kind kind)
	: kind_(kind)
{}


auto_ptr<Inset> InsetMathFrac::doClone() const
{
	return auto_ptr<Inset>(new InsetMathFrac(*this));
}


InsetMathFrac * InsetMathFrac::asFracInset()
{
	return kind_ == ATOP ? 0 : this;
}


InsetMathFrac const * InsetMathFrac::asFracInset() const
{
	return kind_ == ATOP ? 0 : this;
}


bool InsetMathFrac::metrics(MetricsInfo & mi, Dimension & dim) const
{
	FracChanger dummy(mi.base);
	cell(0).metrics(mi);
	cell(1).metrics(mi);
	if (kind_ == NICEFRAC) {
		dim.wid = cell(0).width() + cell(1).width() + 5;
		dim.asc = cell(0).height() + 5;
		dim.des = cell(1).height() - 5;
	} else {
		dim.wid = max(cell(0).width(), cell(1).width()) + 2;
		dim.asc = cell(0).height() + 2 + 5;
		dim.des = cell(1).height() + 2 - 5;
	}
	metricsMarkers(dim);
	if (dim_ == dim)
		return false;
	dim_ = dim;
	return true;
}


void InsetMathFrac::draw(PainterInfo & pi, int x, int y) const
{
	setPosCache(pi, x, y);
	int m = x + dim_.wid / 2;
	FracChanger dummy(pi.base);
	if (kind_ == NICEFRAC) {
		cell(0).draw(pi, x + 2,
				y - cell(0).descent() - 5);
		cell(1).draw(pi, x + cell(0).width() + 5,
				y + cell(1).ascent() / 2);
		pi.pain.line(x + cell(0).width(),
				y + dim_.des - 2,
				x + cell(0).width() + 5,
				y - dim_.asc + 2, Color::math);
	} else {
		cell(0).draw(pi, m - cell(0).width() / 2,
				y - cell(0).descent() - 2 - 5);
		cell(1).draw(pi, m - cell(1).width() / 2,
				y + cell(1).ascent()  + 2 - 5);
	}
	if (kind_ == FRAC || kind_ == OVER)
		pi.pain.line(x + 1, y - 5,
				x + dim_.wid - 2, y - 5, Color::math);
	drawMarkers(pi, x, y);
}


void InsetMathFrac::metricsT(TextMetricsInfo const & mi, Dimension & dim) const
{
	cell(0).metricsT(mi, dim);
	cell(1).metricsT(mi, dim);
	dim.wid = max(cell(0).width(), cell(1).width());
	dim.asc = cell(0).height() + 1;
	dim.des = cell(1).height();
	//dim = dim_;
}


void InsetMathFrac::drawT(TextPainter & pain, int x, int y) const
{
	int m = x + dim_.width() / 2;
	cell(0).drawT(pain, m - cell(0).width() / 2, y - cell(0).descent() - 1);
	cell(1).drawT(pain, m - cell(1).width() / 2, y + cell(1).ascent());
	// ASCII art: ignore niceties
	if (kind_ == FRAC || kind_ == OVER || kind_ == NICEFRAC)
		pain.horizontalLine(x, y, dim_.width());
}


void InsetMathFrac::write(WriteStream & os) const
{
	switch (kind_) {
	case ATOP:
		os << '{' << cell(0) << "\\atop " << cell(1) << '}';
		break;
	case OVER:
		// \\over is only for compatibility, normalize this to \\frac
		os << "\\frac{" << cell(0) << "}{" << cell(1) << '}';
		break;
	case FRAC:
	case NICEFRAC:
		InsetMathNest::write(os);
		break;
	}
}


docstring InsetMathFrac::name() const
{
	switch (kind_) {
	case FRAC:
		return from_ascii("frac");
	case OVER:
		return from_ascii("over");
	case NICEFRAC:
		return from_ascii("nicefrac");
	case ATOP:
		return from_ascii("atop");
	}
	// shut up stupid compiler
	return docstring();
}


bool InsetMathFrac::extraBraces() const
{
	return kind_ == ATOP || kind_ == OVER;
}


void InsetMathFrac::maple(MapleStream & os) const
{
	os << '(' << cell(0) << ")/(" << cell(1) << ')';
}


void InsetMathFrac::mathematica(MathematicaStream & os) const
{
	os << '(' << cell(0) << ")/(" << cell(1) << ')';
}


void InsetMathFrac::octave(OctaveStream & os) const
{
	os << '(' << cell(0) << ")/(" << cell(1) << ')';
}


void InsetMathFrac::mathmlize(MathStream & os) const
{
	os << MTag("mfrac") << cell(0) << cell(1) << ETag("mfrac");
}


void InsetMathFrac::validate(LaTeXFeatures & features) const
{
	if (kind_ == NICEFRAC)
		features.require("nicefrac");
	InsetMathNest::validate(features);
}



} // namespace lyx