tdeedu/kbruch/src/ratiowidget.cpp

/***************************************************************************
                          ratiowidget.h  -  paint a ratio
                             -------------------
    begin                : 2004/06/03
    copyright            : (C) 2004 by Sebastian Stein
    email                : seb.kde@hpfsc.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "ratiowidget.h"
#include "ratiowidget.moc"

/* these includes are needed for TQt support */
#include <tqpainter.h>

RatioWidget::RatioWidget(TQWidget * parent = 0, const char * name = 0,
													const ratio para_ratio = *new ratio()) :
			FractionBaseWidget(parent, name), m_ratio(para_ratio)
{
#ifdef DEBUG
	kdDebug() << "constructor RatioWidget" << endl;
#endif
}

RatioWidget::~RatioWidget()
{
#ifdef DEBUG
	kdDebug() << "destructor RatioWidget" << endl;
#endif
}

void RatioWidget::setRatio(const ratio para_ratio)
{
	m_ratio = para_ratio;
	update();
}

void RatioWidget::paintEvent(TQPaintEvent* /* p_paintEvent */)
{
	// our x position, we paint from left to right;
	// we don't want to start directly on the border, so add the margin
	int x_pos = _MARGIN_X;

	// start the painter
	TQPainter paint(this);

	// ratios and operation signs are painted with the same font
	paint.setFont(m_font);

	// set the pen for painting
	TQPen pen(TQt::SolidLine);
	pen.setWidth(0);
	paint.setPen(pen);

	// get the font height; the font height doesn't change while painting
	TQFontMetrics fm(paint.fontMetrics());

	// now we can correctly set the height of the widget
	setMinimumHeight(2 * fm.lineSpacing() + 10);
	setMaximumHeight(2 * fm.lineSpacing() + 10);

	// result as normal ratio
	paintRatio(paint, m_ratio, x_pos, fm, false);

	// stop the painter
	paint.end();

	// the space we needed for painting is the minimum width of the widget
	setMinimumWidth(x_pos);

	return;
}