Counter Event in Flutter

main.dart
import 'package:flutter/material.dart'; import 'package:flutter_bloc/flutter_bloc.dart'; import 'bloc/login/counter_bloc.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { MyApp({Key key}) : super(key: key); @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, ), home: MyHomePage(title: 'Flutter Demo Home Page'), ); } } class MyHomePage extends StatefulWidget { MyHomePage({Key key, this.title}) : super(key: key); final String title; @override _MyHomePageState createState() => _MyHomePageState(); } class _MyHomePageState extends State<MyHomePage> { CounterBloc _counterBloc; @override void initState() { _counterBloc = CounterBloc(); super.initState(); } @override void dispose() { _counterBloc.dispose(); super.dispose(); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text(widget.title)), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Text( 'You have pushed the button this many times:', ), BlocBuilder( bloc: _counterBloc, builder: (buildContext, state) { return Text( '$state', style: Theme.of(context).textTheme.display1, ); }, ), ], ), ), floatingActionButton: FloatingActionButton( onPressed: () { _counterBloc.dispatch(CounterEvent.increment); }, tooltip: 'Increment', child: Icon(Icons.add), ), ); } }
counter_bloc.dart
import 'package:bloc/bloc.dart'; enum CounterEvent { increment, decrement, reset } class CounterBloc extends Bloc<CounterEvent, int> { @override int get initialState => 0; @override mapEventToState(CounterEvent event) async* { switch (event) { case CounterEvent.decrement: yield currentState - 1; break; case CounterEvent.increment: yield currentState + 1; break; case CounterEvent.reset: yield 0; break; } } }
library
flutter_bloc:
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