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# graphwidget.h Example File
graphicsview/elasticnodes/graphwidget.h

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     #ifndef GRAPHWIDGET_H
     #define GRAPHWIDGET_H

     #include <QtGui/QGraphicsView>

     class Node;

     class GraphWidget : public QGraphicsView
     {
         Q_OBJECT

     public:
         GraphWidget();

         void itemMoved();

     protected:
         void keyPressEvent(QKeyEvent *event);
         void timerEvent(QTimerEvent *event);
         void wheelEvent(QWheelEvent *event);
         void drawBackground(QPainter *painter, const QRectF &rect);

         void scaleView(qreal scaleFactor);

     private:
         int timerId;
         Node *centerNode;
     };

     #endif