autolayout.py 文件源码

def __init__(self, view, attribute, other=None, other_attribute=LayoutAttribute.notAnAttribute):
        assert(isinstance(view, LayoutProxy))
        assert(isinstance(attribute, LayoutAttribute))

        self._view = view
        self._attribute = attribute
        self._constraints = {}

        if other:
            assert(isinstance(other, ui.View))
            assert(isinstance(other_attribute, LayoutAttribute))

            self._other = other
            self._other_attribute = other_attribute
        else:
            self._other = None
            self._other_attribute = LayoutAttribute.notAnAttribute