flutter - change a variable from another class - flutter

Question

I would like when I press on the RawMaterialButton, the textField () class changes to the container () class and appears on the screen,
with the code I have now when I press nothing happens ...
can anyone fix it? Thank you.
void main() => runApp(mainApp());
class mainApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: chat(),
);
}
}
class chat extends StatefulWidget {
const chat({Key? key}) : super(key: key);
#override
_chatState createState() => _chatState();
}
class _chatState extends State<chat> {
bool changeClass = false;
#override
Widget build(BuildContext context) {
return Scaffold(
body: changeClass ? container() : textField(changeClass: changeClass),
);
}
}
class textField extends StatefulWidget {
textField({Key? key, required this.changeClass}) : super(key: key);
bool changeClass = false;
#override
_textFieldState createState() => _textFieldState();
}
class _textFieldState extends State<textField> {
#override
Widget build(BuildContext context) {
return Center(
child: Row(
children: [
Container(
width: 300.0,
height: 60.0,
color: Colors.red,
),
RawMaterialButton(
onPressed: () {
setState(() {
widget.changeClass = true;
});
},
child: Icon(Icons.send),
)
],
),
);
}
}
class container extends StatefulWidget {
const container({Key? key}) : super(key: key);
#override
_containerState createState() => _containerState();
}
class _containerState extends State<container> {
#override
Widget build(BuildContext context) {
return Center(
child: Container(
width: double.infinity,
height: 60.0,
color: Colors.grey,
),
);
}
}
hope someone can help me.
Thank you :)
I write this piece because otherwise it won't let me upload itI write this piece because otherwise it won't let me upload itI write this piece because otherwise it won't let me upload it

Answer 1

You are technically changing a local variable in the _textFieldState, so to solve the problem you have multiple options, one of them is to pass a function that change the state in the _chatState, this code would do so:
void main() => runApp(mainApp());
class mainApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: chat(),
);
}
}
class chat extends StatefulWidget {
const chat({Key? key}) : super(key: key);
#override
_chatState createState() => _chatState();
}
class _chatState extends State<chat> {
bool changeClass = false;
changeClassValue() {
setState(() {
changeClass = !changeClass;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: changeClass
? container()
: textField(changeClassValue: changeClassValue),
);
}
}
class textField extends StatefulWidget {
textField({Key? key, required this.changeClassValue}) : super(key: key);
Function changeClassValue;
#override
_textFieldState createState() => _textFieldState();
}
class _textFieldState extends State<textField> {
#override
Widget build(BuildContext context) {
return Center(
child: Row(
children: [
Container(
width: 300.0,
height: 60.0,
color: Colors.red,
),
RawMaterialButton(
onPressed: () {
setState(() {
widget.changeClassValue();
});
},
child: Icon(Icons.send),
)
],
),
);
}
}
class container extends StatefulWidget {
const container({Key? key}) : super(key: key);
#override
_containerState createState() => _containerState();
}
class _containerState extends State<container> {
#override
Widget build(BuildContext context) {
return Center(
child: Container(
width: double.infinity,
height: 60.0,
color: Colors.grey,
),
);
}
}
where the output would look like: