kbruch/src/factorizedwidget.cpp

   1 /***************************************************************************
   2                           factorizedwidget.h  -  paint a factorization
   3                              -------------------
   4     begin                : 2004/07/11
   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 "factorizedwidget.h"
  19 #include "factorizedwidget.moc"
  20
  21 /* these includes are needed for Qt support */
  22 #include <qpainter.h>
  23
  24 FactorizedWidget::FactorizedWidget(QWidget * parent, const char * name, const uintList para_factors) :
  25                         FractionBaseWidget(parent, name), m_factors(para_factors)
  26 {
  27 #ifdef DEBUG
  28         kdDebug() << "constructor FactorizedWidget" << endl;
  29 #endif
  30 }
  31
  32 FactorizedWidget::~FactorizedWidget()
  33 {
  34 #ifdef DEBUG
  35         kdDebug() << "destructor FactorizedWidget" << endl;
  36 #endif
  37 }
  38
  39 void FactorizedWidget::setFactors(const uintList para_factors)
  40 {
  41         m_factors = para_factors;
  42         update();
  43 }
  44
  45 void FactorizedWidget::paintEvent(QPaintEvent* /* p_paintEvent */)
  46 {
  47         // our x position, we paint from left to right;
  48         // we don't want to start directly on the border, so add the margin
  49         int x_pos = _MARGIN_X;
  50
  51         int fontWidth; // to store the width of the last thing painted
  52
  53         // start the painter
  54         QPainter paint(this);
  55
  56         // ratios and operation signs are painted with the same font
  57         paint.setFont(m_font);
  58
  59         // set the pen for painting
  60         QPen pen(Qt::SolidLine);
  61         pen.setWidth(0);
  62         paint.setPen(pen);
  63
  64         // get the font height; the font height doesn't change while painting
  65         QFontMetrics & fm = * new QFontMetrics(paint.fontMetrics());
  66
  67         // now we can correctly set the height of the widget
  68         setMinimumHeight(fm.lineSpacing());
  69         setMaximumHeight(fm.lineSpacing());
  70
  71         QString tmpStr;
  72         int fontHeight = fm.lineSpacing(); // get the font height
  73
  74         for (uint tmpInt = 0; tmpInt < m_factors.count(); tmpInt++)
  75         {
  76                 // set color for operation sign
  77                 pen.setColor(m_colorOperation);
  78                 paint.setPen(pen);
  79
  80                 if (tmpInt == 0)
  81                 {
  82                         fontWidth = fm.width("=");
  83                         paint.drawText(x_pos, 0, fontWidth, fontHeight, AlignCenter, "=");
  84                         x_pos += fontWidth;
  85                         x_pos += _MARGIN_X;
  86                 } else {
  87                         fontWidth = fm.width("*");
  88                         paint.drawText(x_pos, 0, fontWidth, fontHeight, AlignCenter, "*");
  89                         x_pos += fontWidth;
  90                         x_pos += _MARGIN_X;
  91                 }
  92
  93                 // set color for number
  94                 pen.setColor(m_colorNumber);
  95                 paint.setPen(pen);
  96
  97                 tmpStr.setNum(m_factors[tmpInt]);
  98
  99                 fontWidth = fm.width(tmpStr);
 100                 paint.drawText(x_pos, 0, fontWidth, fontHeight, AlignCenter, tmpStr);
 101                 x_pos += fontWidth;
 102                 x_pos += _MARGIN_X;
 103         }
 104
 105         // stop the painter
 106         paint.end();
 107
 108         // the space we needed for painting is the minimum width of the widget
 109         setMinimumWidth(x_pos);
 110
 111         return;
 112 }