settings.py 文件源码

def add_frame(self, triangle_key):
        """Add a ``ttk.Frame`` to the dialog and return it.

        The frame will contain a label that displays a |triangle| when
        the value of the variable from :meth:`get_var` is invalid. The
        triangle label is packed with ``side='right'``.

        For example, :meth:`add_checkbutton` works roughly like this::

            frame = section.add_frame(key)
            var = section.get_var(key, tkinter.BooleanVar)
            ttk.Checkbutton(frame, text=text, variable=var).pack(side='left')
        """
        frame = ttk.Frame(self.content_frame)
        frame.pack(fill='x')

        if triangle_key is not None:
            errorvar = self._infos[triangle_key].errorvar
            triangle_label = ttk.Label(frame)
            triangle_label.pack(side='right')

            def on_errorvar_changed(*junk):
                if errorvar.get():
                    triangle_label['image'] = 'img_triangle'
                else:
                    triangle_label['image'] = self._get_fake_triangle(frame)

            errorvar.trace('w', on_errorvar_changed)
            on_errorvar_changed()

        return frame