Flutter awaiting result of dialog - flutter

Question

i have the following code which is called by a click of a FlatButton:
_performOrderCheck(BuildContext context) async {
bool _checksCompleted = await _performBundleCheck(context);
print("Sepp");
print(_checksCompleted);
if (_checksCompleted) {
_addArticleToOrder(_innerQty, _article);
Navigator.pop(context);
}
}
Future<bool> _performBundleCheck(BuildContext context) async {
//check bundles
if (!_article.checkBundeledArticles()) {
showDialog(
context: context,
builder: (_) => AlertDialog(
title: Text('Menü unvollständig'),
content: Text(
'Sie haben nicht alle möglichen Artikel gewählt. Wollen sie dennoch fortfahren?'),
actions: <Widget>[
FlatButton(
onPressed: () {
Navigator.pop(_);
return false;
},
child: Text('Nein')),
FlatButton(
onPressed: () {
//_addArticleToOrder(_innerQty, _article);
Navigator.pop(_);
return true;
//Navigator.pop(context);
},
child: Text('Ja')),
],
elevation: 24,
),
barrierDismissible: false);
} else {
return true;
}
}
What i would like is that the could waits for the user decision and then it calls "_addArticleToOrder". Is that possible?
Thanks for any help.

Answer 1

You can add await keyword in-front of showdialog and return value at the end of show dialog.
added await.
await showDialog(
add return value
barrierDismissible: false);
return true; // added line

Answer 2

While the accepted answer is working the result is always returning true.
If you want to get the result of the dialog, which could be false by clicking 'Nein' and true by clicking 'Ja', here´s the code:
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: () async {
_performOrderCheck(context);
},
// onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
_performOrderCheck(BuildContext context) async {
_incrementCounter();
print("_performOrderCheck called");
bool _checksCompleted = await _performBundleCheck(context);
print("_checksCompleted result: $_checksCompleted");
if (_checksCompleted) {
print("_checksCompleted");
}
}
Future<bool> _performBundleCheck(BuildContext context) async {
//check bundles
if (true) {
return await showDialog(
context: context,
builder: (_) => AlertDialog(
title: Text('Menü unvollständig'),
content: Text(
'Sie haben nicht alle möglichen Artikel gewählt. Wollen sie dennoch fortfahren?'),
actions: <Widget>[
FlatButton(
onPressed: () {
Navigator.pop(context, false);
},
child: Text('Nein')),
FlatButton(
onPressed: () {
Navigator.pop(context, true);
},
child: Text('Ja')),
],
elevation: 24,
),
barrierDismissible: false,
);
} else {
return true;
}
}
}
Using Navigator.pop(context, false); and Navigator.pop(context, true); returns the result of the dialog to showDialog.
Using return await returns it then from the _performBundleCheck function to _performOrderCheck.