def __init__(self, *a, **k):
super(ModesComponent, self).__init__(*a, **k)
self._last_toggle_value = 0
self._mode_toggle = None
self._mode_toggle_task = self._tasks.add(
Task.wait(Defaults.MOMENTARY_DELAY))
self._mode_toggle_task.kill()
self._mode_list = []
self._mode_map = {}
self._last_selected_mode = None
self._mode_stack = StackingResource(self._do_enter_mode,
self._do_leave_mode)
self._shift_button = None
