def get_pref_col(self, size):
        (maxcol, maxrow) = size
        if not hasattr(self._original_widget, 'get_pref_col'):
            return None

        if self.height_type == PACK:
            x = self._original_widget.get_pref_col((maxcol,))
        else:
            top, bottom = self.filler_values(size, True)
            x = self._original_widget.get_pref_col(
                (maxcol, maxrow-top-bottom))

        return x
Return pref_col from self.original_widget if any.
dataset/ETHPy150Open AnyMesh/anyMesh-Python/example/urwid/decoration.py/Filler.get_pref_col