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flutter: check bloc updates
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| import 'package:flutter/material.dart'; | |
| import 'package:flutter_bloc/flutter_bloc.dart'; | |
| void main() { | |
| runApp(const MyApp()); | |
| } | |
| class MyApp extends StatelessWidget { | |
| const MyApp({Key? key}) : super(key: key); | |
| @override | |
| Widget build(BuildContext context) { | |
| return const MaterialApp( | |
| home: MyHomePage(title: 'Flutter Demo Home Page'), | |
| ); | |
| } | |
| } | |
| class MyHomePage extends StatefulWidget { | |
| const MyHomePage({Key? key, required this.title}) : super(key: key); | |
| final String title; | |
| @override | |
| State<MyHomePage> createState() => _MyHomePageState(); | |
| } | |
| class _MyHomePageState extends State<MyHomePage> { | |
| @override | |
| Widget build(BuildContext context) { | |
| final state = MyState(); | |
| final cubit = MyCubit(state); | |
| return Scaffold( | |
| appBar: AppBar( | |
| title: Text(widget.title), | |
| ), | |
| body: Center( | |
| child: Column( | |
| mainAxisAlignment: MainAxisAlignment.center, | |
| children: <Widget>[ | |
| // | |
| // create | |
| // | |
| BlocProvider( | |
| // key: UniqueKey(), | |
| create: (_) => MyCubit(state), | |
| child: BlocConsumer<MyCubit, MyState>( | |
| listener: (context, state) {}, | |
| builder: (context, state) { | |
| return Text('state1 is $state (${state.hashCode})'); | |
| }, | |
| ), | |
| ), | |
| // | |
| // value | |
| // | |
| BlocProvider.value( | |
| value: cubit, | |
| child: BlocConsumer<MyCubit, MyState>( | |
| // key: ValueKey(cubit), | |
| listener: (context, state) {}, | |
| builder: (context, state) { | |
| return Text('state2 is $state (${state.hashCode})'); | |
| }, | |
| ), | |
| ), | |
| // | |
| // Consumer in stateless widget | |
| // | |
| BlocProvider.value( | |
| value: MyCubit(state), | |
| child: MyStatelessWidget(), | |
| ), | |
| Text('should be: ${state.hashCode}'), | |
| // MyStatelessWidget(), | |
| ], | |
| ), | |
| ), | |
| floatingActionButton: FloatingActionButton( | |
| onPressed: _refresh, | |
| child: const Icon(Icons.refresh), | |
| ), | |
| ); | |
| } | |
| void _refresh() { | |
| setState(() {}); | |
| } | |
| } | |
| class MyStatelessWidget extends StatelessWidget { | |
| const MyStatelessWidget({Key? key}) : super(key: key); | |
| @override | |
| Widget build(BuildContext context) { | |
| return BlocConsumer<MyCubit, MyState>( | |
| // key: UniqueKey(), | |
| listener: (context, state) {}, | |
| builder: (context, state) { | |
| return Text('state3 is $state (${state.hashCode})'); | |
| }, | |
| ); | |
| } | |
| } | |
| class MyCubit extends Cubit<MyState> { | |
| MyCubit(super.initialState); | |
| } | |
| class MyState {} |
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