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tut 11 komplett
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import 'package:flutter/material.dart'; | |
import 'zaehler_bloc.dart'; | |
import 'zaehler_ereignis.dart'; | |
void main() => runApp(MyApp()); | |
class MyApp extends StatelessWidget { | |
@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> { | |
final _bloc = ZaehlerBloc(); | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
appBar: AppBar( | |
title: Text(widget.title), | |
), | |
body: Center( | |
child:StreamBuilder( | |
stream: _bloc.zaheler, | |
initialData: 0, | |
builder: (BuildContext context, AsyncSnapshot<int> snapshot){ | |
return Column( | |
mainAxisAlignment: MainAxisAlignment.center, | |
children: <Widget>[ | |
Text( | |
'You have pushed the button this many times:', | |
), | |
Text( | |
'${snapshot.data}', | |
style: Theme.of(context).textTheme.display1, | |
), | |
], | |
); | |
}, | |
), | |
), | |
floatingActionButton: Row( | |
mainAxisAlignment: MainAxisAlignment.end, | |
children: <Widget>[ | |
FloatingActionButton( | |
onPressed: ()=>_bloc.zaehlerEventSink.add(AdditionsEreignis()), | |
tooltip: 'Increment', | |
child: Icon(Icons.add), | |
), | |
SizedBox(width: 10.0,), | |
FloatingActionButton( | |
onPressed: ()=>_bloc.zaehlerEventSink.add(SubtraktionsEreignis()), | |
tooltip: 'Decrement', | |
child: Icon(Icons.remove), | |
), | |
], | |
), | |
); | |
} | |
@override | |
void dispose() { | |
super.dispose(); | |
_bloc.dispose(); | |
} | |
} |
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import 'dart:async'; | |
import 'zaehler_ereignis.dart'; | |
class ZaehlerBloc { | |
int _zaehler = 0; | |
final _zaehlerStateController = StreamController<int>(); | |
StreamSink<int> get _inZaehler => | |
_zaehlerStateController.sink; // die Variable ist privat | |
Stream<int> get zaheler => | |
_zaehlerStateController.stream; // die Variable ist öffentlich | |
final _zaehlerEventController = StreamController<ZaehlerEreignis>(); | |
Sink<ZaehlerEreignis> get zaehlerEventSink => _zaehlerEventController.sink; | |
ZaehlerBloc() { | |
_zaehlerEventController.stream.listen(_mapEventToState); | |
} | |
void _mapEventToState(ZaehlerEreignis event) { | |
if (event is AdditionsEreignis) | |
_zaehler++; | |
else | |
_zaehler--; | |
_inZaehler.add(_zaehler); | |
} | |
void dispose() { | |
_zaehlerStateController.close(); | |
_zaehlerEventController.close(); | |
} | |
} |
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abstract class ZaehlerEreignis { | |
} | |
class AdditionsEreignis extends ZaehlerEreignis { | |
} | |
class SubtraktionsEreignis extends ZaehlerEreignis { | |
} |
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