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September 30, 2025 11:56
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simple way to make a screen controller/view using provider and without fullstate widgets
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| import 'package:flutter/material.dart'; | |
| import 'package:provider/provider.dart'; | |
| class MyBudgetModel { | |
| final Set<String> activeCategories; | |
| MyBudgetModel(this.activeCategories); | |
| } | |
| class MyBudgetController extends ChangeNotifier { | |
| final viewModel = MyBudgetModel({"foo", "bar"}); | |
| MyBudgetController(); | |
| void toggleCategory(String cat) { | |
| final a = viewModel.activeCategories; | |
| a.contains(cat) ? a.remove(cat) : a.add(cat); | |
| notifyListeners(); | |
| } | |
| } | |
| void main() { | |
| runApp(const MyApp()); | |
| } | |
| class MyApp extends StatelessWidget { | |
| const MyApp({super.key}); | |
| @override | |
| Widget build(BuildContext context) { | |
| return MaterialApp( | |
| debugShowCheckedModeBanner: false, | |
| home: ChangeNotifierProvider<MyBudgetController>( | |
| create: (context) => MyBudgetController(), | |
| builder: (context, _) { | |
| final ctrl = context.watch<MyBudgetController>(); | |
| return Scaffold( | |
| body: Center(child: MyBudgetWidget(ctrl.viewModel)), | |
| floatingActionButton: FloatingActionButton( | |
| onPressed: () => | |
| context.read<MyBudgetController?>()?.toggleCategory('bar'), | |
| child: const Icon(Icons.beach_access), | |
| ), | |
| ); | |
| }, | |
| ), | |
| ); | |
| } | |
| } | |
| class MyBudgetWidget extends StatelessWidget { | |
| final MyBudgetModel model; | |
| final MyBudgetController? controller; | |
| MyBudgetWidget(this.model, {this.controller}); | |
| @override | |
| Widget build(BuildContext context) { | |
| return Container(child: Text(model.activeCategories.join(' - '))); | |
| } | |
| } |
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