__init__
The alarm state starts off simply: the constructor initializes the alarm repeat time (how long between instances of playing the alarm sound file).
def __init__(self):
super().__init__()
self.sound_alarm_time = None
tick
The tick method does two things.
- It checks whether the snooze button is pressed. If so, it captures the time and transitions back to the time state. Recall that the time state uses
snooze_timeto decide when you reenter the alarm state. - It checks to see if it's time to play the alarm sound. If so, it plays it.
def tick(self, now):
global snooze_time
# is the snooze button pushed
if not snooze_button.value:
snooze_time = now
change_to_state('time')
return
# is it time to sound the alarm?
if self.sound_alarm_time and (now - self.sound_alarm_time) > alarm_interval:
self.sound_alarm_time = now
pyportal.play_file(alarm_file)
touch
If there's a touch anywhere on the screen cancel any snooze that might be active and go back the the time state.
def touch(self, t, touched):
global snooze_time
if t and not touched:
snooze_time = None
change_to_state('time')
return bool(t)
enter
This sets the alarm time to start the process of playing the alarm sound periodically. It then sets the backlight to full brightness, sets the background to the alarm image, and updates the display.
def enter(self):
global low_light
self.sound_alarm_time = time.monotonic()
pyportal.set_backlight(1.00)
pyportal.set_background(alarm_background)
low_light = False
board.DISPLAY.refresh_soon()
board.DISPLAY.wait_for_frame()
exit
Exit calls the base class's implementation and sets whether the alarm is armed based on whether snooze is active.
def exit(self):
global alarm_armed
super().exit()
alarm_armed = bool(snooze_time)
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