def __init__(self, owner):
        """ Initialize a ContainerBoxModel.

        Parameters
        ----------
        owner : string
            A string which uniquely identifies the owner of this box
            model.

        """
        super(ContentsBoxModel, self).__init__(owner)
        self.contents_left = ConstraintVariable('contents_left')
        self.contents_right = ConstraintVariable('contents_right')
        self.contents_top = ConstraintVariable('contents_top')
        self.contents_bottom = ConstraintVariable('contents_bottom')
        self.contents_width = self.contents_right - self.contents_left
        self.contents_height = self.contents_bottom - self.contents_top
        self.contents_v_center = self.contents_top + self.contents_height / 2.0
        self.contents_h_center = self.contents_left + self.contents_width / 2.0
dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/layout/box_model.py/ContentsBoxModel.__init__/original