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