flutter_bloc_stream 4.4.0 flutter_bloc_stream: ^4.4.0 copied to clipboard
Helper package for using bloc_stream with Flutter. Includes BlocStreamProvider and BlocStreamBuilder.
import 'package:bloc_stream/bloc_stream.dart';
import 'package:flutter_bloc_stream/flutter_bloc_stream.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart' hide Action;
import 'package:provider/provider.dart';
void main() => runApp(MyApp());
class CounterActions {
static final Action<CounterBloc, int> increment =
(bloc, add) async => add((bloc.value ?? 0) + 1);
static final Action<CounterBloc, int> decrement =
(bloc, add) async => add((bloc.value ?? 0) - 1);
}
class CounterBloc extends BlocStream<int> {
CounterBloc() : super(0);
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MultiProvider(
providers: [BlocStreamProvider(create: (_) => CounterBloc())],
child: BlocStreamBuilder<CounterBloc, int>(
builder: (context, s) {
return MaterialApp(
supportedLocales: const [Locale('en')],
localizationsDelegates: [
DefaultMaterialLocalizations.delegate,
DefaultWidgetsLocalizations.delegate,
_ExampleLocalizationsDelegate(s),
],
home: const MyHomePage(),
);
},
),
);
}
}
class ExampleLocalizations {
static ExampleLocalizations of(BuildContext context) =>
Localizations.of<ExampleLocalizations>(context, ExampleLocalizations);
const ExampleLocalizations(this._count);
final int _count;
String get title => 'Tapped $_count times';
}
class _ExampleLocalizationsDelegate
extends LocalizationsDelegate<ExampleLocalizations> {
const _ExampleLocalizationsDelegate(this.count);
final int count;
@override
bool isSupported(Locale locale) => locale.languageCode == 'en';
@override
Future<ExampleLocalizations> load(Locale locale) =>
SynchronousFuture(ExampleLocalizations(count));
@override
bool shouldReload(_ExampleLocalizationsDelegate old) => old.count != count;
}
class MyHomePage extends StatelessWidget {
const MyHomePage({Key key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Title()),
body: Center(
child: CounterLabel(),
),
floatingActionButton: IncrementCounterButton(),
);
}
}
class IncrementCounterButton extends StatelessWidget {
@override
Widget build(BuildContext context) {
return FloatingActionButton(
onPressed: () {
BlocStreamProvider.of<CounterBloc>(context)
.add(CounterActions.increment);
},
tooltip: 'Increment',
child: const Icon(Icons.add),
);
}
}
class CounterLabel extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text('You have pushed the button this many times:'),
BlocStreamBuilder<CounterBloc, int>(
builder: (context, count) => Text(
'${count}',
style: Theme.of(context).textTheme.headline4,
),
),
],
);
}
}
class Title extends StatelessWidget {
const Title({Key key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Text(ExampleLocalizations.of(context).title);
}
}