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},
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'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Padding(
padding: const EdgeInsets.all(8),
child: ElevatedButton(
onPressed: () {
// Close the screen and return "Yep!" as the result.
Navigator.pop(context, 'Yep!');
},
child: const Text('Yep!'),
),
),
Padding(
padding: const EdgeInsets.all(8),
child: ElevatedButton(
onPressed: () {
// Close the screen and return "Nope." as the result.
Navigator.pop(context, 'Nope.');
},
child: const Text('Nope.'),
),
)
],
),
),
);
}
}<code_end>
<topic_end>
<topic_start>Add a drawer to a screen
In apps that use Material Design,
there are two primary options for navigation: tabs and drawers.
When there is insufficient space to support tabs,
drawers provide a handy alternative.In Flutter, use the Drawer widget in combination with a
Scaffold to create a layout with a Material Design drawer.
This recipe uses the following steps:<topic_end>
<topic_start>
1. Create a Scaffold
To add a drawer to the app, wrap it in a Scaffold widget.
The Scaffold widget provides a consistent visual structure to apps that
follow the Material Design Guidelines.
It also supports special Material Design
components, such as Drawers, AppBars, and SnackBars.In this example, create a Scaffold with a drawer:
<code_start>Scaffold(
appBar: AppBar(
title: const Text('AppBar without hamburger button'),
),
drawer: // Add a Drawer here in the next step.
);<code_end>
<topic_end>
<topic_start>
2. Add a drawer
Now add a drawer to the Scaffold. A drawer can be any widget,
but it’s often best to use the Drawer widget from the
material library,
which adheres to the Material Design spec.
<code_start>Scaffold(
appBar: AppBar(
title: const Text('AppBar with hamburger button'),
),
drawer: Drawer(
child: // Populate the Drawer in the next step.
),
);<code_end>
<topic_end>
<topic_start>
3. Populate the drawer with items