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型指定しないとFlutter自体のExtensionでエラーが発生
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| import 'package:flutter/material.dart'; | |
| import 'package:provider/provider.dart'; | |
| void main() => runApp(MyApp()); | |
| class MyApp extends StatelessWidget { | |
| @override | |
| Widget build(BuildContext context) { | |
| Hoge hoge = Hoge()..setDuration(Duration(hours: 5)); | |
| return MaterialApp( | |
| title: 'flutter_extension_sample', | |
| home: Scaffold( | |
| body: ChangeNotifierProvider.value( | |
| value: hoge, | |
| builder: (context, Hoge hoge, _) { // require Hoge | |
| return Center( | |
| child: Text(hoge.duration.toHour()), | |
| ); | |
| }, | |
| ), | |
| ), | |
| ); | |
| } | |
| } | |
| class Hoge extends ChangeNotifier { | |
| Duration duration; | |
| Hoge(); | |
| Future<void> setDuration(Duration duration) async { | |
| Future.delayed(Duration(seconds: 3), () { | |
| this.duration = duration; | |
| notifyListeners(); | |
| }); | |
| } | |
| } | |
| extension MyDurationX on Duration { | |
| String toHour() { | |
| return "${this.inHours}h"; | |
| } | |
| } |
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| name: flutter_extension_sample | |
| description: A new Flutter project. | |
| version: 1.0.0+1 | |
| environment: | |
| sdk: ">=2.6.0 <3.0.0" | |
| dependencies: | |
| flutter: | |
| sdk: flutter | |
| cupertino_icons: ^0.1.2 | |
| provider: | |
| git: | |
| url: https://github.com/rrousselGit/provider.git | |
| ref: extensions | |
| dev_dependencies: | |
| flutter_test: | |
| sdk: flutter | |
| flutter: | |
| uses-material-design: true |
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