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Flutter Counter with Signals
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| import 'package:flutter/material.dart'; | |
| import 'package:signals/signals_flutter.dart'; | |
| void main() { | |
| runApp(const App()); | |
| } | |
| class App extends StatelessWidget { | |
| const App({super.key}); | |
| ThemeData createTheme(BuildContext context, Brightness brightness) { | |
| return ThemeData( | |
| colorScheme: ColorScheme.fromSeed( | |
| seedColor: Colors.blue, | |
| brightness: brightness, | |
| ), | |
| brightness: brightness, | |
| useMaterial3: true, | |
| ); | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return MaterialApp( | |
| title: 'Flutter Demo', | |
| debugShowCheckedModeBanner: false, | |
| theme: createTheme(context, Brightness.light), | |
| darkTheme: createTheme(context, Brightness.dark), | |
| themeMode: ThemeMode.system, | |
| home: const CounterExample(), | |
| ); | |
| } | |
| } | |
| class CounterExample extends StatefulWidget { | |
| const CounterExample({super.key}); | |
| @override | |
| State<CounterExample> createState() => _CounterExampleState(); | |
| } | |
| class _CounterExampleState extends State<CounterExample> { | |
| late final Signal<int> counter = createSignal(context, 0); | |
| void _incrementCounter() { | |
| counter.value++; | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return Scaffold( | |
| appBar: AppBar( | |
| title: const Text('Flutter Counter'), | |
| ), | |
| body: Center( | |
| child: Column( | |
| mainAxisAlignment: MainAxisAlignment.center, | |
| children: <Widget>[ | |
| const Text( | |
| 'You have pushed the button this many times:', | |
| ), | |
| Text( | |
| '$counter', | |
| style: Theme.of(context).textTheme.headlineMedium, | |
| ), | |
| ], | |
| ), | |
| ), | |
| floatingActionButton: FloatingActionButton( | |
| onPressed: _incrementCounter, | |
| tooltip: 'Increment', | |
| child: const Icon(Icons.add), | |
| ), | |
| ); | |
| } | |
| } |
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