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# chart/canvasview.h Example File

    #ifndef CANVASVIEW_H
    #define CANVASVIEW_H

    #include "element.h"
    #include "canvastext.h"

    #include <qcanvas.h>

    class QPoint;

    class CanvasView : public QCanvasView
    {
        Q_OBJECT
    public:
        CanvasView( QCanvas *canvas, ElementVector *elements,
                    QWidget* parent = 0, const char* name = "canvas view",
                    WFlags f = 0 )
            : QCanvasView( canvas, parent, name, f ), m_movingItem(0),
              m_elements( elements ) {}

    protected:
        void viewportResizeEvent( QResizeEvent *e );
        void contentsMousePressEvent( QMouseEvent *e );
        void contentsMouseMoveEvent( QMouseEvent *e );
        void contentsContextMenuEvent( QContextMenuEvent *e );

    private:
        QCanvasItem *m_movingItem;
        QPoint m_pos;
        ElementVector *m_elements;
    };

    #endif