Datasets:
Ekhlass
/
flutter_docs

Dataset card Data Studio Files
xet
Community
1
text
stringlengths
1
372
navigator.pop(context, 'nope.');
},
child: const Text('Nope.'),
)
<code_end>
<topic_end>
<topic_start>
5. show a snackbar on the home screen with the selection
now that you’re launching a selection screen and awaiting the result,
you’ll want to do something with the information that’s returned.
in this case, show a snackbar displaying the result by using the
_navigateAndDisplaySelection() method in SelectionButton:
<code_start>
// a method that launches the SelectionScreen and awaits the result from
// navigator.pop.
future<void> _navigateAndDisplaySelection(BuildContext context) async {
// navigator.push returns a future that completes after calling
// navigator.pop on the selection screen.
final result = await navigator.push(
context,
MaterialPageRoute(builder: (context) => const SelectionScreen()),
);
// when a BuildContext is used from a StatefulWidget, the mounted property
// must be checked after an asynchronous gap.
if (!context.mounted) return;
// after the selection screen returns a result, hide any previous snackbars
// and show the new result.
ScaffoldMessenger.of(context)
..removeCurrentSnackBar()
..showSnackBar(SnackBar(content: text('$result')));
}
<code_end>
<topic_end>
<topic_start>
interactive example
<code_start>
import 'package:flutter/material.dart';
void main() {
runApp(
const MaterialApp(
title: 'returning data',
home: HomeScreen(),
),
);
}
class HomeScreen extends StatelessWidget {
const HomeScreen({super.key});
@override
widget build(BuildContext context) {
return scaffold(
appBar: AppBar(
title: const Text('Returning data demo'),
),
body: const center(
child: SelectionButton(),
),
);
}
}
class SelectionButton extends StatefulWidget {
const SelectionButton({super.key});
@override
State<SelectionButton> createState() => _SelectionButtonState();
}
class _SelectionButtonState extends State<SelectionButton> {
@override
widget build(BuildContext context) {
return ElevatedButton(
onPressed: () {
_navigateAndDisplaySelection(context);
},
child: const Text('Pick an option, any option!'),
);
}
// a method that launches the SelectionScreen and awaits the result from
// navigator.pop.
future<void> _navigateAndDisplaySelection(BuildContext context) async {
// navigator.push returns a future that completes after calling
// navigator.pop on the selection screen.
final result = await navigator.push(
context,
MaterialPageRoute(builder: (context) => const SelectionScreen()),
);
// when a BuildContext is used from a StatefulWidget, the mounted property
// must be checked after an asynchronous gap.
if (!context.mounted) return;
// after the selection screen returns a result, hide any previous snackbars
// and show the new result.
ScaffoldMessenger.of(context)
..removeCurrentSnackBar()
..showSnackBar(SnackBar(content: text('$result')));
}
}
class SelectionScreen extends StatelessWidget {
const SelectionScreen({super.key});
@override
widget build(BuildContext context) {
return scaffold(
appBar: AppBar(
title: const Text('Pick an option'),