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/***************************************************************************
rationalwidget.h - paint a rational number
-------------------
begin : 2004/06/04
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 "rationalwidget.h"
#include "rationalwidget.moc"
/* these includes are needed for Qt support */
#include <qpainter.h>
#include <qstring.h>
RationalWidget::RationalWidget(QWidget * parent, const char * name, const QString pnumber, const uint pperiodStart, const uint pperiodLength):
FractionBaseWidget(parent, name), m_number(pnumber),
m_periodStart(pperiodStart), m_periodLength(pperiodLength)
{
#ifdef DEBUG
kdDebug() << "constructor RationalWidget" << endl;
#endif
}
RationalWidget::~RationalWidget()
{
#ifdef DEBUG
kdDebug() << "destructor RationalWidget" << endl;
#endif
}
void RationalWidget::setRational(const QString pnumber, const uint pperiodStart, const uint pperiodLength)
{
m_number = pnumber;
m_periodStart = pperiodStart;
m_periodLength = pperiodLength;
update();
return;
}
void RationalWidget::paintEvent(QPaintEvent* /* 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;
int x_startPos = _MARGIN_X;
bool tmp_painting = false;
// start the painter
QPainter paint(this);
// ratios and operation signs are painted with the same font
paint.setFont(m_font);
// set the pen for painting
QPen pen(Qt::SolidLine);
pen.setWidth(0);
paint.setPen(pen);
// get the font height; the font height doesn't change while painting
QFontMetrics fm(paint.fontMetrics());
int fontHeight = fm.lineSpacing(); // get the font height
// now we can correctly set the height of the widget
setMinimumHeight(2 * fontHeight + 10);
setMaximumHeight(2 * fontHeight + 10);
// paint each char one by one
for (uint stringPos = 0; stringPos < m_number.length(); stringPos++)
{
// check if the period line starts over the current number
if (m_periodLength > 0 && stringPos == m_periodStart && tmp_painting == false)
{
x_startPos = x_pos;
tmp_painting = true;
}
// paint the current number (or comma)
paintMiddle(paint, QString(m_number[stringPos]), x_pos, fm, m_colorNumber, false);
// check if the period line ends over the current number; in this case
// draw the period line
if (tmp_painting == true && m_periodStart + m_periodLength - 1 == stringPos)
{
tmp_painting = false;
// paint the period line above the numbers
paint.fillRect(x_startPos, fontHeight - 3, x_pos - x_startPos, 1, m_colorNumber);
}
}
// paint a = at the end
x_pos += _MARGIN_X;
paintMiddle(paint, "=", x_pos, fm, m_colorOperation);
// stop the painter
paint.end();
// the space we needed for painting is the minimum width of the widget
setMinimumWidth(x_pos);
return;
}
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