Qt 4.3: imageitem.cpp Example File (sql/drilldown/imageitem.cpp)

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# imageitem.cpp Example File
sql/drilldown/imageitem.cpp

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     #include "imageitem.h"

     ImageItem::ImageItem(int id, const QPixmap &pixmap, QGraphicsItem *parent,
                          QGraphicsScene *scene)
         : QGraphicsPixmapItem(pixmap, parent, scene)
     {
         recordId = id;
         setAcceptsHoverEvents(true);

         timeLine.setDuration(150);
         timeLine.setFrameRange(0, 150);

         connect(&timeLine, SIGNAL(frameChanged(int)), this, SLOT(setFrame(int)));
         connect(&timeLine, SIGNAL(finished()), this, SLOT(updateItemPosition()));

         adjust();
     }

     void ImageItem::hoverEnterEvent(QGraphicsSceneHoverEvent * /*event*/)
     {
         timeLine.setDirection(QTimeLine::Forward);

         if (z != 1.0) {
             z = 1.0;
             updateItemPosition();
         }

         if (timeLine.state() == QTimeLine::NotRunning)
             timeLine.start();
     }

     void ImageItem::hoverLeaveEvent(QGraphicsSceneHoverEvent * /*event*/)
     {
         timeLine.setDirection(QTimeLine::Backward);
         if (z != 0.0)
             z = 0.0;

         if (timeLine.state() == QTimeLine::NotRunning)
             timeLine.start();
     }

     void ImageItem::setFrame(int frame)
     {
         adjust();
         QPointF center = boundingRect().center();

         translate(center.x(), center.y());
         scale(1 + frame / 330.0, 1 + frame / 330.0);
         translate(-center.x(), -center.y());
     }

     void ImageItem::adjust()
     {
         QMatrix matrix;
         matrix.scale(150/ boundingRect().width(), 120/ boundingRect().height());
         setMatrix(matrix);
     }

     int ImageItem::id()
     {
         return recordId;
     }

     void ImageItem::updateItemPosition()
     {
         setZValue(z);
     }