kbruch/src/taskwidget.cpp

   1 /***************************************************************************
   2                           taskwidget.cpp  -  paint a task
   3                              -------------------
   4     begin                : 2004/05/30
   5     copyright            : (C) 2004 by Sebastian Stein
   6     email                : seb.kde@hpfsc.de
   7  ***************************************************************************/
   8
   9 /***************************************************************************
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  ***************************************************************************/
  17
  18 #include "taskwidget.h"
  19 #include "taskwidget.moc"
  20
  21 /* these includes are needed for KDE support */
  22 #include <klocale.h>
  23
  24 /* these includes are needed for Qt support */
  25 #include <qpainter.h>
  26
  27 TaskWidget::TaskWidget(QWidget * parent = 0, const char * name = 0,
  28                                                                                                         const task para_task = *new task()) :
  29                         FractionBaseWidget(parent, name), m_task(para_task)
  30 {
  31 #ifdef DEBUG
  32         kdDebug() << "constructor TaskWidget" << endl;
  33 #endif
  34 }
  35
  36 TaskWidget::~TaskWidget()
  37 {
  38 #ifdef DEBUG
  39         kdDebug() << "destructor TaskWidget" << endl;
  40 #endif
  41 }
  42
  43 void TaskWidget::setTask(const task para_task)
  44 {
  45         m_task = para_task;
  46         update();
  47 }
  48
  49 void TaskWidget::paintEvent(QPaintEvent* /* p_paintEvent */)
  50 {
  51         // our x position, we paint from left to right;
  52         // we don't want to start directly on the border, so add the margin
  53         int old_x = _MARGIN_X;
  54
  55         // strings holding numerator, denominator and the operation sign
  56         QString str_numerator, str_denominator, str_operation;
  57
  58         // operation sign as number
  59         short tmp_operation;
  60
  61         // start the painter
  62         QPainter paint(this);
  63
  64         // ratios and operation signs are painted with the same font
  65         paint.setFont(m_font);
  66
  67         // set the pen for painting
  68         QPen pen(Qt::SolidLine);
  69         pen.setWidth(0);
  70         paint.setPen(pen);
  71
  72         // get the font height; the font height doesn't change while painting
  73         QFontMetrics & fm = * new QFontMetrics(paint.fontMetrics());
  74
  75         // now we can correctly set the height of the widget
  76         setMinimumHeight(2 * fm.lineSpacing() + 10);
  77         setMaximumHeight(2 * fm.lineSpacing() + 10);
  78
  79         // loop through all ratios and paint them
  80         for (unsigned short tmp_counter = 0; tmp_counter < m_task.getNumberOfRatios(); tmp_counter++)
  81         {
  82                 // get the current ratio and paint it
  83                 paintRatio(paint, m_task.get_ratio_n(tmp_counter), old_x, fm, false);
  84
  85                 // now check if we have another operation to show
  86                 // if not we will stop showing ratios as well
  87                 if (tmp_counter < m_task.getNumberOfOperations())
  88                 {
  89                         // get the operation sign
  90                         tmp_operation = m_task.get_op_n(tmp_counter);
  91
  92                         // we have to convert the operation sign into a string
  93                         switch (tmp_operation)
  94                         {
  95                                 case ADD :
  96                                         str_operation = "+";
  97                                         break;
  98                                 case SUB :
  99                                         str_operation = "-";
 100                                         break;
 101                                 case MUL :
 102                                         str_operation = "x";
 103                                         break;
 104                                 case DIV :
 105                                         // there seems to be different division signs around the world
 106                                         // so please translate it to the right one for your country
 107                                         str_operation = i18n("division symbol", "/");
 108                                         break;
 109                         } /* switch (operation) */
 110
 111                         // paint the operation
 112                         paintMiddle(paint, str_operation, old_x, fm, m_colorOperation);
 113
 114                 } else {
 115                         // no further operations to show, so we always show the = sign at the
 116                         // end of a task
 117                         paintMiddle(paint, "=", old_x, fm, m_colorOperation);
 118
 119                         break;
 120                 } // if (tmp_counter < m_task.getNumberOfOperations())
 121         }
 122
 123         // stop the painter
 124         paint.end();
 125
 126         // the space we needed for painting is the minimum width of the widget
 127         setMinimumWidth(old_x);
 128
 129         return;
 130 }