def dragMoveEvent( self, event ):
        """
        Processes the drag drop event using the filter set by the \
        setDragDropFilter
        
        :param      event | <QDragEvent>
        """
        filt = self.dragDropFilter()
        if not filt:
            super(XTreeWidget, self).dragMoveEvent(event)
            return
        
        filt(self, event)