pixmapviewer.cpp

   1 #include "pixmapviewer.h"
   2
   3
   4 void PixmapViewer::paintEvent(QPaintEvent* )
   5 {
   6     QPainter p(this);
   7     QSize s = size();
   8     if (m_p.isNull()) {
   9         int edge = qMin(s.width(), s.height()) - 4;
  10         int offx = (s.width() - edge) / 2;
  11         int offy = (s.height() - edge) / 2;
  12         QRect r(offx, offy, edge, edge);
  13         p.fillRect(r, Qt::white);
  14         p.drawLine(edge + offx, offy, offx, offy+edge);
  15         p.drawLine(offx, offy, offx+edge, offy+edge);
  16         p.drawRect(r);
  17     } else {
  18         double ratiox = (double)s.width()/(double)m_p.width();
  19         double ratioy = (double)s.height()/(double)m_p.height();
  20         double ratio = qMin(ratiox, ratioy);
  21         int w = (int)(ratio*m_p.width());
  22         int h = (int)(ratio*m_p.height());
  23         int offx = (s.width() - w)/2;
  24         int offy = (s.height() - h)/2;
  25         QRect r(offx, offy, w, h);
  26         p.drawPixmap(r, m_p);
  27     }
  28 }
  29
  30
  31 void PixmapViewer::mousePressEvent(QMouseEvent* e)
  32 {
  33     if (e->buttons()) {
  34         if (e->buttons() & Qt::RightButton) {
  35             if ( QMessageBox::warning(0, "Unset image?", QString("Unset image?")) ) {
  36                 setPixmap(QPixmap());
  37                 emit changed();
  38             }
  39         } else {
  40             QString file = QFileDialog::getOpenFileName(0, "Select an image");
  41             QPixmap tmp;
  42             if (!file.isEmpty()) {
  43                 if (tmp.load ( file ) ) {
  44                     setPixmap(tmp);
  45                     QMessageBox::warning(0, "Failure loading image", QString("Failed load image file %1").arg(file));
  46                     emit changed();
  47                 }
  48             }
  49         }
  50     }
  51 }