/// Flutter code sample for {{element}} // @dart = 2.9 {{description}} import 'package:flutter/material.dart'; {{code-imports}} void main() => runApp(new MyApp()); /// This is the main application widget. class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return WidgetsApp( title: 'Flutter Code Sample', home: Center( child: MyStatefulWidget(restorationId: 'main'), ), color: const Color(0xffffffff), ); } } {{code-preamble}} /// This is the stateful widget that the main application instantiates. class MyStatefulWidget extends StatefulWidget { MyStatefulWidget({Key key, this.restorationId}) : super(key: key); final String restorationId; @override _MyStatefulWidgetState createState() => _MyStatefulWidgetState(); } /// This is the private State class that goes with MyStatefulWidget. /// RestorationProperty objects can be used because of RestorationMixin. class _MyStatefulWidgetState extends State<MyStatefulWidget> with RestorationMixin { // In this example, the restoration ID for the mixin is passed in through // the [StatefulWidget]'s constructor. @override String get restorationId => widget.restorationId; {{code}} }