Returns the mime data for dragging for this instance.
        
        :param      items | [<QTableWidgetItem>, ..]

def mimeData( self, items ):
        """
        Returns the mime data for dragging for this instance.
        
        :param      items | [<QTableWidgetItem>, ..]
        """
        func = self.dataCollector()
        if ( func ):
            return func(self, items)
            
        return super(XTableWidget, self).mimeData(items)