riverbloc

Description:

riverbloc

An implementation of BlocProvider based on #riverpod providers.
The goal of this package is to make easy the migration from flutter_bloc to
flutter_riverpod.
If you are interested in hooks with bloc, see also
flutter_hooks_bloc
Usage #
It's similar to StateNotiferProvider but with Bloc instead of StateNotifier.
class CounterCubit extends Cubit<int> {
CounterCubit(int state) : super(state);

void increment() => emit(state + 1);
}

final counterProvider = BlocProvider<CounterCubit, int>(
(ref) => CounterCubit(0),
);

class MyHomePage extends ConsumerWidget {
const MyHomePage({Key? key, this.title}) : super(key: key);

final String title;

@override
Widget build(BuildContext context, WidgetRef ref) {
// Rebuilds the widget if the cubit/bloc changes.
// But does not rebuild if the state changes with the same cubit/bloc
final counterCubit = ref.watch(counterProvider.bloc);
return Scaffold(
appBar: AppBar(
title: Text(title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'initial counterCubit.state: ${counterCubit.state}',
),
Consumer(builder: (context, watch, __) {
// Rebuilds in every emitted state
final _counter = ref.watch(counterProvider);
return Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
);
}),
Consumer(
builder: (context, ref, __) {
final _counter = ref.watch(
counterProvider
.when((prev, curr) => (curr + prev) % 5 == 0)
.select((state) => 2 * state),
);
return Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
);
},
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: () => ref.read(counterProvider.bloc).increment(),
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
copied to clipboard