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# diagramscene.cpp Example File
tools/undoframework/diagramscene.cpp

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     #include <QtGui>

     #include "diagramscene.h"
     #include "diagramitem.h"

     DiagramScene::DiagramScene(QObject *parent)
         : QGraphicsScene(parent)
     {
         movingItem = 0;
     }

     void DiagramScene::mousePressEvent(QGraphicsSceneMouseEvent *event)
     {
         QPointF mousePos(event->buttonDownScenePos(Qt::LeftButton).x(),
                          event->buttonDownScenePos(Qt::LeftButton).y());
         movingItem = itemAt(mousePos.x(), mousePos.y());

         if (movingItem != 0 && event->button() == Qt::LeftButton) {
             oldPos = movingItem->pos();
         }

         clearSelection();
         QGraphicsScene::mousePressEvent(event);
     }

     void DiagramScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
     {
         if (movingItem != 0 && event->button() == Qt::LeftButton) {
             if (oldPos != movingItem->pos())
                 emit itemMoved(qgraphicsitem_cast<DiagramItem *>(movingItem),
                                oldPos);
             movingItem = 0;
         }
         QGraphicsScene::mouseReleaseEvent(event);
     }