Created
October 2, 2019 20:41
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Save fleepgeek/80c50c75c102520cff284034380b04c5 to your computer and use it in GitHub Desktop.
Corresponding code for my YouTube tutorial series for learning the BLoC pattern
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| import 'dart:async'; | |
| 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: 'Flutter Demo', | |
| theme: ThemeData( | |
| primarySwatch: Colors.red, | |
| ), | |
| home: FriendList(), | |
| ); | |
| } | |
| } | |
| class FriendList extends StatefulWidget { | |
| @override | |
| _FriendListState createState() => _FriendListState(); | |
| } | |
| class _FriendListState extends State<FriendList> { | |
| List<String> _friends = []; | |
| final _friendsController = StreamController<List<String>>(); | |
| final _textController = TextEditingController(); | |
| @override | |
| void dispose() { | |
| _friendsController.close(); | |
| _textController.dispose(); | |
| super.dispose(); | |
| } | |
| void addFriend(String value) { | |
| _friends.add(value); | |
| _friendsController.sink.add(_friends); | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return Scaffold( | |
| appBar: AppBar( | |
| title: Text("Friend List"), | |
| ), | |
| body: Column( | |
| children: <Widget>[ | |
| Expanded( | |
| child: _buildFriendList(), | |
| ), | |
| Padding( | |
| padding: EdgeInsets.all(8.0), | |
| child: TextField( | |
| controller: _textController, | |
| decoration: InputDecoration( | |
| border: OutlineInputBorder(), | |
| hintText: 'Enter New Friend', | |
| ), | |
| onSubmitted: (value) { | |
| addFriend(value); | |
| _textController.clear(); | |
| }, | |
| ), | |
| ), | |
| ], | |
| ), | |
| ); | |
| } | |
| Widget _buildFriendList() { | |
| return StreamBuilder<List<String>>( | |
| stream: _friendsController.stream, | |
| builder: (context, snapshot) { | |
| if (snapshot.hasData) { | |
| return ListView.separated( | |
| itemCount: _friends.length, | |
| separatorBuilder: (context, index) => Divider(), | |
| itemBuilder: (context, index) { | |
| return ListTile( | |
| title: Text('${snapshot.data[index]}'), | |
| ); | |
| }, | |
| ); | |
| } | |
| return Column( | |
| mainAxisAlignment: MainAxisAlignment.center, | |
| children: <Widget>[ | |
| Icon(Icons.add), | |
| Text('Add New Friend'), | |
| ], | |
| ); | |
| }); | |
| } | |
| } |
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| import 'dart:async'; | |
| import 'dart:convert'; | |
| import 'dart:io'; | |
| void main() { | |
| //streamFromIterable(); | |
| //streamUsingController(); | |
| // readNameFile(); | |
| } | |
| void streamFromIterable() { | |
| final list = [2, 3, 8, 9, 12]; | |
| final stream = Stream.fromIterable(list); | |
| final subscription = stream.where((value) => value.isEven).listen(null); | |
| subscription.onData((value) => print(value)); | |
| Another way | |
| subscription.onData((value){ | |
| if(value == 9){ | |
| subscription.cancel(); | |
| } | |
| print(value); | |
| }); | |
| subscription.onError((err) => print('Error $err')); | |
| subscription.onDone(() => print('Done')); | |
| } | |
| void streamUsingController() { | |
| final _controller = StreamController<int>.broadcast(); | |
| Stream<int> counterStream = _controller.stream; | |
| final sub1 = counterStream.listen((value) => print(value)); | |
| final sub2 = counterStream.listen((value) => print(value)); | |
| _controller.sink.add(1); | |
| Future.delayed(Duration(milliseconds: 2000), () { | |
| _controller.sink.add(2); | |
| _controller.close(); | |
| }); | |
| //_controller.close(); | |
| } | |
| void readNameFile() { | |
| final file = File('names.txt'); | |
| file.openRead() | |
| .transform(utf8.decoder) | |
| .transform(customTransformer) | |
| .transform(LineSplitter()) | |
| .listen((value){ | |
| print("Received"); | |
| print(value); | |
| }); | |
| } | |
| var customTransformer = StreamTransformer<String, String>.fromHandlers( | |
| handleData: (value, sink) { | |
| sink.add(value.toUpperCase()); | |
| } | |
| ); |
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