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/***************************************************************************
taskwidget.cpp - paint a task
-------------------
begin : 2004/05/30
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 "taskwidget.h"
#include "taskwidget.moc"
/* these includes are needed for KDE support */
#include <klocale.h>
/* these includes are needed for Qt support */
#include <qpainter.h>
TaskWidget::TaskWidget(QWidget * parent = 0, const char * name = 0,
const task para_task = *new task()) :
FractionBaseWidget(parent, name), m_task(para_task)
{
#ifdef DEBUG
kdDebug() << "constructor TaskWidget" << endl;
#endif
}
TaskWidget::~TaskWidget()
{
#ifdef DEBUG
kdDebug() << "destructor TaskWidget" << endl;
#endif
}
void TaskWidget::setTask(const task para_task)
{
m_task = para_task;
update();
}
void TaskWidget::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 old_x = _MARGIN_X;
// strings holding numerator, denominator and the operation sign
QString str_numerator, str_denominator, str_operation;
// operation sign as number
short tmp_operation;
// 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());
// now we can correctly set the height of the widget
setMinimumHeight(2 * fm.lineSpacing() + 10);
setMaximumHeight(2 * fm.lineSpacing() + 10);
// loop through all ratios and paint them
for (unsigned short tmp_counter = 0; tmp_counter < m_task.getNumberOfRatios(); tmp_counter++)
{
// get the current ratio and paint it
paintRatio(paint, m_task.get_ratio_n(tmp_counter), old_x, fm, false);
// now check if we have another operation to show
// if not we will stop showing ratios as well
if (tmp_counter < m_task.getNumberOfOperations())
{
// get the operation sign
tmp_operation = m_task.get_op_n(tmp_counter);
// we have to convert the operation sign into a string
switch (tmp_operation)
{
case ADD :
str_operation = "+";
break;
case SUB :
str_operation = "-";
break;
case MUL :
str_operation = "x";
break;
case DIV :
// there seems to be different division signs around the world
// so please translate it to the right one for your country
str_operation = i18n("division symbol", "/");
break;
} /* switch (operation) */
// paint the operation
paintMiddle(paint, str_operation, old_x, fm, m_colorOperation);
} else {
// no further operations to show, so we always show the = sign at the
// end of a task
paintMiddle(paint, "=", old_x, fm, m_colorOperation);
break;
} // if (tmp_counter < m_task.getNumberOfOperations())
}
// stop the painter
paint.end();
// the space we needed for painting is the minimum width of the widget
setMinimumWidth(old_x);
return;
}
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