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@felangel felangel/main.dart
Created Dec 12, 2018

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dynamic Event in Bloc
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:bloc/bloc.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
class SimpleBlocDelegate extends BlocDelegate {
@override
void onTransition(Transition transition) {
print(transition.toString());
}
}
void main() {
BlocSupervisor().delegate = SimpleBlocDelegate();
runApp(MyApp());
}
class MyApp extends StatefulWidget {
@override
State<StatefulWidget> createState() => MyAppState();
}
class MyAppState extends State<MyApp> {
final CounterBloc _counterBloc = CounterBloc();
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
home: BlocProvider<CounterBloc>(
bloc: _counterBloc,
child: CounterPage(),
),
);
}
@override
void dispose() {
_counterBloc.dispose();
super.dispose();
}
}
class CounterPage extends StatelessWidget {
@override
Widget build(BuildContext context) {
final CounterBloc _counterBloc = BlocProvider.of<CounterBloc>(context);
return Scaffold(
appBar: AppBar(title: Text('Counter')),
body: BlocBuilder<dynamic, int>(
bloc: _counterBloc,
builder: (BuildContext context, int count) {
return Center(
child: Text(
'$count',
style: TextStyle(fontSize: 24.0),
),
);
},
),
floatingActionButton: Column(
crossAxisAlignment: CrossAxisAlignment.end,
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
Padding(
padding: EdgeInsets.symmetric(vertical: 5.0),
child: FloatingActionButton(
child: Icon(Icons.add),
onPressed: () {
_counterBloc.dispatch(Increment());
},
),
),
Padding(
padding: EdgeInsets.symmetric(vertical: 5.0),
child: FloatingActionButton(
child: Icon(Icons.remove),
onPressed: () {
_counterBloc.dispatch(Decrement());
},
),
),
],
),
);
}
}
abstract class CounterEvent {}
class Increment extends CounterEvent {
@override
String toString() => 'Increment';
}
class Decrement extends CounterEvent {
@override
String toString() => 'Decrement';
}
class CounterBloc extends Bloc<dynamic, int> {
@override
int get initialState => 0;
@override
Stream<int> mapEventToState(int state, dynamic event) async* {
if (event is Increment) {
yield state + 1;
}
if (event is Decrement) {
yield state - 1;
}
}
}
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