Flutter Navigation: how to make a routename as a funciton of an instance? - flutter

Question

I want to make a new page which depends on a text input that a user typed in, so I want to make a routeName as a function of an instance, the following code doesn't work..
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
initialRoute: 'main',
routes: {
'main': (context) => MainPage(),
NodeInsideChat().routeName(): (context) => NodeInsideChat(),
},
);
}
}
Here You can see I'm trying to make routeName be newly genereated as an each page is created. But I have no idea what to pass inside NodeInsideChat()..
class MainPage extends StatefulWidget {
#override
_MainPageState createState() => _MainPageState();
}
class _MainPageState extends State<MainPage> {
String wordInput;
#override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
TextField(
onChanged: (value) {
wordInput = value;
},
),
RawMaterialButton(
onPressed: () {
Navigator.pushNamed(context, NodeInsideChat(wordInput).routeName(),
arguments: NodeInsideScreenArguments(wordInput));
},
fillColor: Colors.red,
child: Text('Go to the new Page'),
),
],
);
}
}
class NodeInsideChat extends StatelessWidget {
NodeInsideChat(this.wordInput);
final String wordInput;
String routeName() {
return wordInput;
}
#override
Widget build(BuildContext context) {
final NodeInsideScreenArguments args =
ModalRoute.of(context).settings.arguments;
return Scaffold(
appBar: AppBar(
backgroundColor: Color(0xFFFF8A80),
title: Text(
args.wordindex,
style: TextStyle(
fontSize: 20.0,
),
),
),
);
}
}
class NodeInsideScreenArguments {
final String wordindex;
NodeInsideScreenArguments(this.wordindex);
}
By ModalRoute or onGenerateRoute, I could not set the routeName as a function..