widgets.py 文件源码

def __init__(self, *args, **kwargs):
        self._select = Dropdown(*args,**kwargs)
        self._edit = Button(description='...',
                            layout=Layout(width='15px'))
        self._composite = HBox([self._select,self._edit])
        super(DropdownWithEdit, self).__init__()
        self.layout = self._composite.layout
        # so that others looking at this widget's value get the
        # dropdown's value
        traitlets.link((self._select,'value'),(self,'value'))
        self._edit.on_click(lambda _: editor(self._select.value))
        self._select.observe(lambda e: self._set_editable(e['new']),'value')
        self._set_editable(self._select.value)