Use Navigator.push (MaterialPageRoute) instead of AlertDialog - flutter

Question

I would like to use Navigator.push (MaterialPageRoute) instead of AlertDialog as now I think its better for my user to have a full page to post content rather than a dialog box, how would I go about editing my code to do this? Thanks in advance
appBar: AppBar(
centerTitle: true,
title: Text('hehe',
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 25.0),),
actions: <Widget>[
Padding(
padding: const EdgeInsets.only(right: 10.0),
child: IconButton(icon: Icon(Icons.comment),
onPressed: () {
showDialog(context: context,
builder: (BuildContext context){
return AlertDialog(
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10.0)),
content: Form(key: formKey,
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Padding(
padding: EdgeInsets.all(8.0),
child: TextFormField(
initialValue: '',
onSaved: (val) => board.subject = val,
validator: (val) => val == "" ? val: null,
),
),
Padding(
padding: EdgeInsets.all(8.0),
child: RaisedButton(
color: Colors.indigo,
child: Text(
'Post',
style: TextStyle(color: Colors.white),),
onPressed: () {
handleSubmit();
Navigator.of(context).pop();
},
),
)
],
),
),
);
},
);
}
),
),
],
),

Answer 1

Create a StatefulWidget subclass say MyForm.
class MyForm extends StatefulWidget {
#override
_MyFormState createState() => _MyFormState();
}
class _MyFormState extends State<MyForm> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text("My form")),
body: Form(
key: formKey,
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Padding(
padding: EdgeInsets.all(8.0),
child: TextFormField(
initialValue: '',
onSaved: (val) => board.subject = val,
validator: (val) => val == "" ? val : null,
),
),
Padding(
padding: EdgeInsets.all(8.0),
child: RaisedButton(
color: Colors.indigo,
child: Text(
'Post',
style: TextStyle(color: Colors.white),
),
onPressed: () {
handleSubmit();
Navigator.of(context).pop();
},
),
)
],
),
),
);
}
}
And use it like this in your onPressed method.
onPressed: () {
Navigator.push(context, MaterialPagerRoute(builder: (context) => MyForm()));
}
So, when the button is clicked, you will be navigated to the new page which is your form currently.