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Piinks/main.dart

Created Jul 24, 2020
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ScaffoldMessenger
import 'package:flutter/material.dart';
void main() {
runApp(new MaterialApp(
routes: <String, WidgetBuilder>{
'/': (BuildContext context) => HomePage(),
'/second': (BuildContext context) => SecondPage(),
},
));
}
class HomePage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('Home')),
body: HomeBody(),
floatingActionButton: FloatingActionButton(
onPressed: () async {
ScaffoldMessengerState scaffoldMessenger = ScaffoldMessenger.of(context);
await Future.delayed(Duration(seconds: 5));
ScaffoldFeatureController controller = scaffoldMessenger.showSnackBar(
const SnackBar(content: Text('Snack-tastic')),
);
final result = await controller.closed;
print(result);
},
child: const Text('GO!'),
),
);
}
}
class HomeBody extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Expanded(child: Container()),
Padding(
padding: const EdgeInsets.all(16.0),
child: Text.rich(
TextSpan(
children:[
TextSpan(text: 'Pressing GO initiates\n'),
TextSpan(
text: 'ScaffoldMessenger.showSnackBar\n',
style: TextStyle(fontWeight: FontWeight.bold),
),
TextSpan(text: 'after a 5 second delay.'),
]
),
textAlign: TextAlign.center,
)
),
Container(height: 100),
RaisedButton(
child: Text('push Page 2'),
onPressed: () {
Navigator.of(context).pushNamed('/second');
},
),
Container(height: 50),
RaisedButton(
child: Text('popAndPush Page 2'),
onPressed: () {
Navigator.of(context).popAndPushNamed('/second');
},
),
Container(height: 50),
RaisedButton(
child: Text('pushReplacement Page 2'),
onPressed: () {
Navigator.of(context).pushReplacementNamed('/second');
},
),
Expanded(child: Container(), flex: 2),
],
),
);
}
}
class SecondPage extends StatelessWidget {
@override
Widget build(BuildContext context) {
bool canPop = ModalRoute.of(context)?.canPop ?? false;
return Scaffold(
appBar: AppBar(title: Text('Second')),
body: Center(child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('Second Page'),
if (!canPop) RaisedButton(
child: Text('Start Over'),
onPressed: () {
Navigator.of(context).pushReplacementNamed('/');
},
)
],
))
);
}
}
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