async_helper_mixin 1.0.0 async_helper_mixin: ^1.0.0 copied to clipboard
A new Flutter project.
import 'dart:async';
import 'package:async_helper_mixin/async_helper_mixin.dart';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Async Widget Helper Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Async widget helper demo'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
StreamController<int> _periodicController;
@override
void initState() {
super.initState();
_periodicController = StreamController.broadcast()
..addStream(
Stream.periodic(
Duration(seconds: 1),
(timePassed) => timePassed,
),
);
}
@override
void dispose() {
super.dispose();
_periodicController.close();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
MyFutureWidget(
future: Future.delayed(Duration(seconds: 5), () => 2),
),
Padding(
padding: const EdgeInsets.symmetric(vertical: 16),
child: Divider(
height: 3,
),
),
MyStreamWidget(_periodicController.stream),
],
),
),
);
}
}
class MyStreamWidget extends StatelessWidget with StreamHelperMixin {
final Stream<int> periodicStream;
MyStreamWidget(this.periodicStream);
@override
Stream<Widget> buildStream(BuildContext context) {
return periodicStream.map((t) => Text('$t elapsed'));
}
@override
Widget get defaultWidget => Text('Waiting stream');
}
class MyFutureWidget extends StatelessWidget with FutureHelperMixin {
final Future<int> future;
MyFutureWidget({@required this.future});
@override
Future<Widget> buildFuture(BuildContext context) async {
final value = await future;
return Text('Future result is $value');
}
@override
Widget get defaultWidget => Text('Waiting future result');
}