Bloc: flutter_timer: how to make duration dynamic?

[marcoheine]

Hi,

i want to make the duration variable dynamic.
The user should determine the seconds. But I just can't do it.
Can someone help me and give an example?

[narcodico]

Hi @marcoheine 👋

class Ticker {
  const Ticker({this.duration});

  final Duration duration;

  Stream<int> tick({int ticks}) {
    return Stream.periodic(duration ?? const Duration(seconds: 1), (x) => ticks - x - 1)
        .take(ticks);
  }
}

BlocProvider(
        create: (context) => TimerBloc(ticker: Ticker(duration: const Duration(milliseconds: 500))),
        child: Timer(),
      ),

Is that what you're after ?

[marcoheine]

Hi @narcodico,

thank you for the answer!
But this is not what i'm after.

I want to have the 60 dynamical:

`class TimerBloc extends Bloc {

final Ticker _ticker;
static const int _duration = 60;

StreamSubscription _tickerSubscription;

TimerBloc({@required Ticker ticker})
: assert(ticker != null),
_ticker = ticker,
super(TimerInitial(_duration));

@override
void onTransition(Transition transition) {
print(transition);
super.onTransition(transition);
}`

[narcodico]

I see.

TimerBloc({@required Ticker ticker, this.duration})
      : assert(ticker != null),
        _ticker = ticker,
        super(TimerInitial(duration ?? _duration));

final Duration duration;

Then you can provide your bloc with a different value for the duration.

BlocProvider(
        create: (context) => TimerBloc(ticker: Ticker(), duration: const Duration(milliseconds: 500)),
        child: Timer(),
      ),

The reset should also be handled a bit different:

Stream<TimerState> _mapTimerResetToState(TimerReset reset) async* {
    _tickerSubscription?.cancel();
    yield TimerInitial(duration);
  }

This is just a quick solution, normally you'd want to move even the initial duration on the state class to avoid storing data in the bloc itself. I'll leave that as an exercise 😊

[marcoheine]

@narcodico thank you so much! :-)