kbruch/src/ratiowidget.cpp

   1 /***************************************************************************
   2                           ratiowidget.h  -  paint a ratio
   3                              -------------------
   4     begin                : 2004/06/03
   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 "ratiowidget.h"
  19 #include "ratiowidget.moc"
  20
  21 /* these includes are needed for Qt support */
  22 #include <qpainter.h>
  23
  24 RatioWidget::RatioWidget(QWidget * parent = 0, const char * name = 0,
  25                                                                                                         const ratio para_ratio = *new ratio()) :
  26                         FractionBaseWidget(parent, name), m_ratio(para_ratio)
  27 {
  28 #ifdef DEBUG
  29         kdDebug() << "constructor RatioWidget" << endl;
  30 #endif
  31 }
  32
  33 RatioWidget::~RatioWidget()
  34 {
  35 #ifdef DEBUG
  36         kdDebug() << "destructor RatioWidget" << endl;
  37 #endif
  38 }
  39
  40 void RatioWidget::setRatio(const ratio para_ratio)
  41 {
  42         m_ratio = para_ratio;
  43         update();
  44 }
  45
  46 void RatioWidget::paintEvent(QPaintEvent* /* p_paintEvent */)
  47 {
  48         // our x position, we paint from left to right;
  49         // we don't want to start directly on the border, so add the margin
  50         int x_pos = _MARGIN_X;
  51
  52         // start the painter
  53         QPainter paint(this);
  54
  55         // ratios and operation signs are painted with the same font
  56         paint.setFont(m_font);
  57
  58         // set the pen for painting
  59         QPen pen(Qt::SolidLine);
  60         pen.setWidth(0);
  61         paint.setPen(pen);
  62
  63         // get the font height; the font height doesn't change while painting
  64         QFontMetrics & fm = * new QFontMetrics(paint.fontMetrics());
  65
  66         // now we can correctly set the height of the widget
  67         setMinimumHeight(2 * fm.lineSpacing() + 10);
  68         setMaximumHeight(2 * fm.lineSpacing() + 10);
  69
  70         // result as normal ratio
  71         paintRatio(paint, m_ratio, x_pos, fm, false);
  72
  73         // stop the painter
  74         paint.end();
  75
  76         // the space we needed for painting is the minimum width of the widget
  77         setMinimumWidth(x_pos);
  78
  79         return;
  80 }