Qt:Документация 4.3.2/graphicsview-elasticnodes-graphwidget-h

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[править] 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

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Qt 4.3.2