Source code for enable.layout.ab_constrainable

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from abc import ABCMeta


class ABConstrainable(object, metaclass=ABCMeta):
    """ An abstract base class for objects that can be laid out using
    layout helpers.

    Minimally, instances need to have `top`, `bottom`, `left`, `right`,
    `layout_width`, `layout_height`, `v_center` and `h_center` attributes
    which are `LinearSymbolic` instances.

    """