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diagramscene.h

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#ifndef DIAGRAMSCENE_H
#define DIAGRAMSCENE_H

#include <QObject>
#include <QGraphicsScene>

class DiagramItem;
QT_BEGIN_NAMESPACE
class QGraphicsSceneDragDropEvent;
class QGraphicsViewItem;
QT_END_NAMESPACE

//! [0]
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;
};
//! [0]

#endif

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