Saving dialog content before closing it - sqlite

Question

I'm making a dialog containing a list of items, each of which includes an editable text field.
I'd like to save the contents of edited text fields to a SQLite database on dialog close.
How would I do that? There seems to be no such thing as an onClose listener in Flutter and once the dialog is closed, I won't be able to retrieve the text from text fields.

Answer 1

As You have not shared any code - so i share a minimal example of what you intend to do.
Data can be passed with the use of Navigator.
class DemoApp extends StatefulWidget {
#override
DemoAppState createState() {
return new DemoAppState();
}
}
class DemoAppState extends State<DemoApp> {
String val = 'Empty';
TextEditingController cntrl = TextEditingController();
#override
void dispose() {
cntrl.dispose();
super.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('Value is -- $val'),
RaisedButton(
onPressed: () async {
val = await showDialog(
context: context,
builder: (context) {
cntrl.clear();
return AlertDialog(
title: Text('Enter Value'),
content: TextField(
controller: cntrl,
),
actions: <Widget>[
FlatButton(
onPressed: () {
Navigator.pop(context, cntrl.text);
},
child: Text('Save')),
],
);
});
setState(() {});
},
child: Text('Edit Value'),
)
],
),
)));
}
}