qt5base-lts/examples/graphicsview/elasticnodes/graphwidget.h

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#ifndef GRAPHWIDGET_H
#define GRAPHWIDGET_H

#include <QtWidgets/QGraphicsView>

class Node;

//! [0]
class GraphWidget : public QGraphicsView
{
    Q_OBJECT

public:
    GraphWidget(QWidget *parent = 0);

    void itemMoved();

public slots:
    void shuffle();
    void zoomIn();
    void zoomOut();

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;
};
//! [0]

#endif