Returns tuple of selection parameters of self

        (self.block_tl, self.block_br, self.rows, self.cols, self.cells)

def parameters(self):
        """Returns tuple of selection parameters of self

        (self.block_tl, self.block_br, self.rows, self.cols, self.cells)

        """

        return self.block_tl, self.block_br, self.rows, self.cols, self.cells