customproxy.h Example File

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 #ifndef CUSTOMPROXY_H
 #define CUSTOMPROXY_H

 #include <QtCore/qtimeline.h>
 #include <QtWidgets/qgraphicsproxywidget.h>

 class CustomProxy : public QGraphicsProxyWidget
 {
     Q_OBJECT
 public:
     CustomProxy(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0);

     QRectF boundingRect() const;
     void paintWindowFrame(QPainter *painter, const QStyleOptionGraphicsItem *option,
                           QWidget *widget);

 protected:
     void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
     void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
     bool sceneEventFilter(QGraphicsItem *watched, QEvent *event);
     QVariant itemChange(GraphicsItemChange change, const QVariant &value);

 private slots:
     void updateStep(qreal step);
     void stateChanged(QTimeLine::State);
     void zoomIn();
     void zoomOut();

 private:
     QTimeLine *timeLine;
     bool popupShown;
     QGraphicsItem *currentPopup;
 };

 #endif