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diagramscene.h Example File
tools/undoframework/diagramscene.h

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 #ifndef DIAGRAMSCENE_H
 #define DIAGRAMSCENE_H

 #include <QObject>
 #include <QGraphicsScene>

 class DiagramItem;
 class QGraphicsSceneDragDropEvent;
 class QGraphicsViewItem;

 class DiagramScene : public QGraphicsScene
 {
     Q_OBJECT

 public:
     DiagramScene(QObject *parent = 0);

 signals:
     void itemMoved(DiagramItem *movedItem, const QPointF &movedFromPosition);

 protected:
     void mousePressEvent(QGraphicsSceneMouseEvent *event);
     void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);

 private:
     QGraphicsItem *movingItem;
     QPointF oldPos;
 };

 #endif