126 lines
3.1 KiB
Dart
126 lines
3.1 KiB
Dart
// ignore_for_file: public_member_api_docs
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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void main() => runApp(MyApp());
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class Counter with ChangeNotifier {
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int _count = 0;
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int get count => _count;
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void increment() {
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_count++;
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notifyListeners();
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}
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}
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class MyApp extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return MultiProvider(
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providers: [
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ChangeNotifierProvider(builder: (_) => Counter()),
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],
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child: Consumer<Counter>(
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builder: (context, counter, _) {
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return MaterialApp(
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supportedLocales: const [Locale('en')],
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localizationsDelegates: [
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DefaultMaterialLocalizations.delegate,
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DefaultWidgetsLocalizations.delegate,
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_ExampleLocalizationsDelegate(counter.count),
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],
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home: const MyHomePage(),
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);
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},
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),
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);
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}
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}
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class ExampleLocalizations {
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static ExampleLocalizations of(BuildContext context) =>
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Localizations.of<ExampleLocalizations>(context, ExampleLocalizations);
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const ExampleLocalizations(this._count);
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final int _count;
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String get title => 'Tapped $_count times';
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}
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class _ExampleLocalizationsDelegate
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extends LocalizationsDelegate<ExampleLocalizations> {
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const _ExampleLocalizationsDelegate(this.count);
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final int count;
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@override
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bool isSupported(Locale locale) => locale.languageCode == 'en';
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@override
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Future<ExampleLocalizations> load(Locale locale) =>
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SynchronousFuture(ExampleLocalizations(count));
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@override
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bool shouldReload(_ExampleLocalizationsDelegate old) => old.count != count;
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}
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class MyHomePage extends StatelessWidget {
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const MyHomePage({Key key}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(title: const Title()),
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body: const Center(child: CounterLabel()),
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floatingActionButton: const IncrementCounterButton(),
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);
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}
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}
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class IncrementCounterButton extends StatelessWidget {
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const IncrementCounterButton({Key key}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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return FloatingActionButton(
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onPressed: Provider.of<Counter>(context).increment,
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tooltip: 'Increment',
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child: const Icon(Icons.add),
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);
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}
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}
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class CounterLabel extends StatelessWidget {
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const CounterLabel({Key key}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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final counter = Provider.of<Counter>(context);
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return Column(
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mainAxisSize: MainAxisSize.min,
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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const Text(
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'You have pushed the button this many times:',
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),
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Text(
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'${counter.count}',
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style: Theme.of(context).textTheme.display1,
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),
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],
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);
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}
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}
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class Title extends StatelessWidget {
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const Title({Key key}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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return Text(ExampleLocalizations.of(context).title);
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}
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}
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