Created
May 28, 2019 02:47
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[flutter_timer] Timer Bloc pause event
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import 'dart:async'; | |
import 'package:meta/meta.dart'; | |
import 'package:bloc/bloc.dart'; | |
import 'package:flutter_timer/bloc/bloc.dart'; | |
import 'package:flutter_timer/ticker.dart'; | |
class TimerBloc extends Bloc<TimerEvent, TimerState> { | |
final Ticker _ticker; | |
final int _duration = 60; | |
StreamSubscription<int> _tickerSubscription; | |
TimerBloc({@required Ticker ticker}) | |
: assert(ticker != null), | |
_ticker = ticker; | |
@override | |
TimerState get initialState => Ready(_duration); | |
@override | |
Stream<TimerState> mapEventToState( | |
TimerEvent event, | |
) async* { | |
if (event is Start) { | |
yield* _mapStartToState(event); | |
} else if (event is Pause) { | |
yield* _mapPauseToState(event); | |
} else if (event is Tick) { | |
yield* _mapTickToState(event); | |
} | |
} | |
@override | |
void dispose() { | |
_tickerSubscription?.cancel(); | |
super.dispose(); | |
} | |
Stream<TimerState> _mapStartToState(Start start) async* { | |
yield Running(start.duration); | |
_tickerSubscription?.cancel(); | |
_tickerSubscription = _ticker.tick(ticks: start.duration).listen( | |
(duration) { | |
dispatch(Tick(duration: duration)); | |
}, | |
); | |
} | |
Stream<TimerState> _mapPauseToState(Pause pause) async* { | |
final state = currentState; | |
if (state is Running) { | |
_tickerSubscription?.pause(); | |
yield Paused(state.duration); | |
} | |
} | |
Stream<TimerState> _mapTickToState(Tick tick) async* { | |
yield tick.duration > 0 ? Running(tick.duration) : Finished(); | |
} | |
} |
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