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requiredata-in-asyncsnapshot-in-flutter.dart
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requiredata-in-asyncsnapshot-in-flutter.dart
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// 🐦 Twitter https://twitter.com/vandadnp
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import 'dart:typed_data';
import 'package:flutter/material.dart';
@immutable
abstract class AppState {}
@immutable
class AppStateEmpty implements AppState {}
@immutable
class AppStateHasData implements AppState {
final Uint8List data;
const AppStateHasData(this.data);
}
void main() {
runApp(
const App(),
);
}
class App extends StatelessWidget {
const App({
Key? key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(
primarySwatch: Colors.blue,
),
debugShowCheckedModeBanner: false,
home: const HomePage(),
);
}
}
Stream<AppState> getAppState() async* {}
class HomePage extends StatelessWidget {
const HomePage({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Home Page'),
),
body: StreamBuilder<AppState>(
initialData: AppStateEmpty(),
stream: getAppState(),
builder: (context, snapshot) {
final state = snapshot.requireData;
return Text('State is $state');
},
),
);
}
}