sealed_generator 0.0.6 sealed_generator: ^0.0.6 copied to clipboard
Code gen for flutter's sealed classes
import 'dart:math';
import 'package:flutter/material.dart';
import 'package:sealed_demo/result.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> {
Result<String> result = Idle();
void _changeState() {
setState(() {
var value = Random().nextInt(3);
if (value == 0) {
result = Failure();
} else if (value == 1) {
result = Success<String>("Value from success");
} else if (value == 2) {
result = Idle();
}
});
}
@override
Widget build(BuildContext context) {
var resultWidget = result.when(
success: (event) => Text(event.value),
failure: (event) => Text("Failure"),
idle: (event) => Text("idle"),
);
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
resultWidget,
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _changeState,
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}