Created
March 11, 2022 03:06
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DartChildUpdateFromParent
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import 'package:flutter/material.dart'; | |
const Color darkBlue = Color.fromARGB(255, 18, 32, 47); | |
void main() { | |
runApp(MyApp()); | |
} | |
class MyApp extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return MaterialApp( | |
theme: ThemeData.dark().copyWith( | |
scaffoldBackgroundColor: darkBlue, | |
), | |
debugShowCheckedModeBanner: false, | |
home: Scaffold( | |
body: Center( | |
child: ParentWid(), | |
), | |
), | |
); | |
} | |
} | |
class ParentWid extends StatefulWidget { | |
@override | |
State<ParentWid> createState() => _ParentWidState(); | |
} | |
class _ParentWidState extends State<ParentWid> { | |
int counter = 0; | |
@override | |
Widget build(BuildContext context) { | |
return Column(children:[ | |
IconButton( | |
onPressed: () { | |
setState(() { | |
counter++; | |
}); | |
}, | |
icon: const Icon(Icons.add), | |
), | |
ChildWid(counter) | |
]); | |
} | |
} | |
class ChildWid extends StatefulWidget { | |
final int? counter; | |
const ChildWid(this.counter); | |
@override | |
State<ChildWid> createState() => _ChildWidState(); | |
} | |
class _ChildWidState extends State<ChildWid> { | |
@override | |
Widget build(BuildContext context) { | |
return Text( | |
'Current Counter ${widget.counter ?? 0}', | |
style: Theme.of(context).textTheme.headline4, | |
); | |
} | |
} |
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