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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!'),
);
}
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,
// create the SelectionScreen in the next step.
MaterialPageRoute(builder: (context) => const SelectionScreen()),
);
}
}
<code_end>
<topic_end>
<topic_start>
3. show the selection screen with two buttons
now, build a selection screen that contains two buttons.
when a user taps a button,
that app closes the selection screen and lets the home
screen know which button was tapped.
this step defines the UI.
the next step adds code to return data.
<code_start>
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: [
padding(
padding: const EdgeInsets.all(8),
child: ElevatedButton(
onPressed: () {
// pop here with "yep"...
},
child: const Text('Yep!'),
),
),
padding(
padding: const EdgeInsets.all(8),
child: ElevatedButton(
onPressed: () {
// pop here with "nope"...
},
child: const Text('Nope.'),
),
)
],
),
),
);
}
}
<code_end>
<topic_end>
<topic_start>
4. when a button is tapped, close the selection screen
now, update the onPressed() callback for both of the buttons.
to return data to the first screen,
use the navigator.pop() method,
which accepts an optional second argument called result.
any result is returned to the future in the SelectionButton.
<topic_end>
<topic_start>
yep button
<code_start>
ElevatedButton(
onPressed: () {
// close the screen and return "yep!" as the result.
navigator.pop(context, 'yep!');
},
child: const Text('Yep!'),
)
<code_end>
<topic_end>
<topic_start>
nope button
<code_start>
ElevatedButton(
onPressed: () {
// close the screen and return "nope." as the result.