qt5base-lts/examples/widgets/animation/stickman/graphicsview.h

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#ifndef GRAPHICSVIEW_H
#define GRAPHICSVIEW_H

#include <QtWidgets/QGraphicsView>

class MainWindow;
class GraphicsView: public QGraphicsView
{
    Q_OBJECT
public:
    GraphicsView(QWidget *parent = 0);

protected:
    virtual void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE;
    void keyPressEvent(QKeyEvent *) Q_DECL_OVERRIDE;

signals:
    void keyPressed(int key);

private:
    MainWindow *m_editor;
};

#endif