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Example on how to use didUpdateWidget
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| import 'package:flutter/material.dart'; | |
| void main() { | |
| runApp(const MyApp()); | |
| } | |
| class MyApp extends StatefulWidget { | |
| const MyApp({super.key}); | |
| @override | |
| State<MyApp> createState() => _MyAppState(); | |
| } | |
| class _MyAppState extends State<MyApp> { | |
| bool value = false; | |
| @override | |
| Widget build(BuildContext context) => MaterialApp( | |
| debugShowCheckedModeBanner: false, | |
| home: Scaffold( | |
| body: Center(child: AppCheckbox(value: value)), | |
| floatingActionButton: FloatingActionButton.extended( | |
| onPressed: () { | |
| setState(() { | |
| value = !value; | |
| }); | |
| }, | |
| label: Text("Change checkbox value"), | |
| icon: value ? Icon(Icons.check_box) : Icon(Icons.check_box_outline_blank) | |
| ), | |
| ), | |
| ); | |
| } | |
| class AppCheckbox extends StatefulWidget { | |
| const AppCheckbox({ | |
| required this.value, | |
| super.key, | |
| }); | |
| final bool value; | |
| @override | |
| State<AppCheckbox> createState() => _AppCheckBoxState(); | |
| } | |
| class _AppCheckBoxState extends State<AppCheckbox> { | |
| late bool selected = widget.value; | |
| // If this is commented, | |
| // the selected will not be updated when the parameter [value] is updated | |
| @override | |
| void didUpdateWidget(covariant AppCheckbox oldWidget) { | |
| super.didUpdateWidget(oldWidget); | |
| if (oldWidget.value != widget.value) { | |
| setState(() { | |
| selected = widget.value; | |
| }); | |
| } | |
| } | |
| @override | |
| Widget build(BuildContext context) => Checkbox( | |
| value: selected, | |
| onChanged: (value) { | |
| setState(() { | |
| selected = value ?? false; | |
| }); | |
| }, | |
| ); | |
| } |
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