def __init__(self):
self._volume = self.MINVOL
self.playing = True
automat = TimedFiniteAutomaton("idle")
automat.add_state("volume_up")
automat.add_state("volume_down")
automat.add_state("nudge_up")
automat.add_state("nudge_down")
automat.add_state("volume_up_or_toggle")
automat.add_state("volume_down_or_toggle")
automat.add_state("toggle_play_pause")
# waiting for either volume change or toggling play/pause
automat.add_transition("idle", "volume_up_or_toggle", "volume+pressed")
automat.add_transition("idle", "volume_down_or_toggle", "volume-pressed")
# after self.SAME_TIME_THRESHOLD seconds, we will transition to volue up/down
# we will re-enter the state on .5 timer events to further increase volume
automat.add_transition("volume_up_or_toggle", "volume_up", self.SAME_TIME_THRESHOLD)
automat.add_transition("volume_down_or_toggle", "volume_down", self.SAME_TIME_THRESHOLD)
automat.add_transition("volume_up", "volume_up", .5)
automat.add_transition("volume_down", "volume_down", .5)
automat.add_transition("volume_up", "idle", "volume+released")
automat.add_transition("volume_down", "idle", "volume-released")
# when we wait for toggle_play_pause, but already release,
# just nudge the volume once in the respective direction!
automat.add_transition("volume_up_or_toggle", "nudge_up", "volume+released")
automat.add_transition("nudge_up", "idle")
automat.add_transition("volume_down_or_toggle", "nudge_down", "volume-released")
automat.add_transition("nudge_down", "idle")
# if within this timeframe the opposite key was pressed, toggle!
automat.add_transition("volume_up_or_toggle", "toggle_play_pause", "volume-pressed")
automat.add_transition("volume_down_or_toggle", "toggle_play_pause", "volume+pressed")
# from play_pause, transition automatically back to idle
automat.add_transition("toggle_play_pause", "idle")
self._automat = automat
self._automat.add_state_change_listener(self._react_to_state_changes)
print(automat.dot())
