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qt'QDragMoveEvent (./qt-2.1.0/src/kernel/qevent.h:354)

class Q_EXPORT QDragMoveEvent : public QDropEvent
{
public:
    QDragMoveEvent( const QPoint& pos, Type typ=DragMove )
	: QDropEvent(pos,typ),
	  rect( pos, QSize( 1, 1 ) ) {}
    QRect answerRect() const { return rect; }
    void accept( bool y=TRUE ) { QDropEvent::accept(y); }
    void accept( const QRect & r) { accpt = TRUE; rect = r; }
    void ignore( const QRect & r) { accpt =FALSE; rect = r; }
    void ignore()		{ QDropEvent::ignore(); }

protected:
    QRect rect;
};