How to use the feeluown.controller_api.ControllerApi.notify_widget.show_message function in feeluown

def exit(cls):
        ControllerApi.notify_widget.show_message("通知", "退出 FM 播放模式")

def delete_playlist(self):
        m = QMessageBox(QMessageBox.Warning, '警告', '确认删除歌单么 ?',
                        QMessageBox.Yes | QMessageBox.No)
        if m.exec() != QMessageBox.Yes:
            return False

        pid = self.data['id']
        flag = ControllerApi.api.delete_playlist(pid)
        if flag:
            ControllerApi.notify_widget.show_message('◕◡◔', '删除歌单成功')
            self.close()
            self.deleteLater()
            return True
        else:
            ControllerApi.notify_widget.show_message('◕◠◔', '删除歌单失败')
            return False

def reset_song_list(cls):
        ControllerApi.player.clear_playlist()
        if len(cls._songs) > 0:
            song = cls._songs.pop()
            mid = song['id']
            music_model = ControllerApi.api.get_song_detail(mid)
            if not ControllerApi.api.is_response_ok(music_model):
                ControllerApi.notify_widget.show_message("Error", "网络异常，请检查网络连接")
                return
            ControllerApi.player.set_music_list([music_model])
        else:
            cls._songs = cls.get_songs()
            if not ControllerApi.api.is_response_ok(cls._songs):
                ControllerApi.player.stop()
                ControllerApi.notify_widget.show_message("Error", "网络异常，请检查网络连接")
            elif cls._songs == []:
                ControllerApi.notify_widget.show_message("|--|", "未知错误")
            else:
                cls.reset_song_list()

def add_to_playlist(self, pid):
        if not ControllerApi.state['current_mid']:
            return False
        flag = ControllerApi.api.add_song_to_playlist(ControllerApi.state['current_mid'], pid)
        if flag:
            ControllerApi.notify_widget.show_message('◕◡◔', '加入歌单成功')
        else:
            ControllerApi.notify_widget.show_message('◕◠◔', '加入歌单失败, 可能早已在列表了哦')

def change_to_simi(self):
        PlaylistItem.de_active_all()
        if self.current_mode == 1:
            FmMode.exit_()
        elif self.current_mode == 2:
            ControllerApi.notify_widget.show_message("提示", "你正处于单曲电台模式")
            return
        self.current_mode = 2
        ControllerApi.player.change_player_mode_to_other()
        SimiSongsMode.load_()

def toggle_desktop_mini(cls):
        if ControllerApi.desktop_mini.isVisible():
            ControllerApi.desktop_mini.close()
        else:
            ControllerApi.desktop_mini.show()
            ControllerApi.notify_widget.show_message(
                "Tips", "按ESC可以退出mini模式哦 ~")