auth_screen.py 文件源码

def __init__(self, pubpen):
        self.pubpen = pubpen

        username_label = urwid.Text('Username: ', align='right')
        password_label = urwid.Text('Password: ', align='right')
        self.username = urwid.Edit()
        self.password = urwid.Edit()
        login_button = urwid.Button('Login')
        decorated_login_button = urwid.AttrMap(login_button, None, focus_map='reversed')
        quit_button = urwid.Button('Quit')
        decorated_quit_button = urwid.AttrMap(quit_button, None, focus_map='reversed')
        buttons = urwid.Columns((
            (len('Login') + 4, decorated_login_button),
            (len('Quit') + 4, decorated_quit_button),
            ), focus_column=1)

        labels = urwid.Pile([username_label, password_label])
        self.fields = urwid.Pile([self.username, self.password, buttons],
                                 focus_item=0)
        entry_box = urwid.Columns([labels, self.fields])

        self.status_message = urwid.Text(' ', align='center')
        entry_with_status = urwid.Pile([entry_box, self.status_message])

        padded_entry_with_status = urwid.Padding(entry_with_status, align='center')
        self.display = urwid.Filler(padded_entry_with_status, valign='middle')
        decorate = urwid.LineBox(self.display)
        super().__init__(decorate)

        self.focusable_widgets = (w for w in itertools.cycle((
            ((self.fields, 1),),
            ((self.fields, 2), (buttons, 0)),
            ((self.fields, 2), (buttons, 1)),
            ((self.fields, 0),)
            )))

        urwid.connect_signal(login_button, 'click', self.attempt_login)
        urwid.connect_signal(quit_button, 'click', self.quit)
        self.pubpen.subscribe('user.login_success', self.handle_login_success)
        self.pubpen.subscribe('user.login_failure', self.handle_login_failure)