Creating custom widgets with multiple constructors - flutter

Question

So I am trying to create a custom widget in flutter that has multiple constructors.
Essentially I am creating an arrow button but want to be able to create the button with arrow icons facing in different directions.
Currently my code looks like this:
class RotateButton extends StatefulWidget {
RotateButton.left() {
_RotateButtonState createState() => _RotateButtonState.left();
}
RotateButton.right() {
_RotateButtonState createState() => _RotateButtonState.right();
}
#override
_RotateButtonState createState() => _RotateButtonState();
}
class _RotateButtonState extends State<RotateButton> {
IconData icon;
_RotateButtonState();
_RotateButtonState.left() {
icon = Icons.arrow_back;
}
_RotateButtonState.right() {
icon = Icons.arrow_forward;
}
#override
Widget build(BuildContext context) {
return Container(
decoration: BoxDecoration(
color: kPrimaryColor,
borderRadius: BorderRadius.circular(20),
),
child: Padding(
padding: const EdgeInsets.all(15.0),
child: Icon(
icon,
size: 70,
),
),
);
}
}
Every time I use my widget it just defaults to the default constructor and shows no Icon child.
Is there a way to build a class without making a default constructor.
Also is there a way I can build this widget without using a stateful widget as it kind of just overcomplicates it.
I am getting a message that says:
The declaration 'createState' isn't referenced
This message is coming up next to the named constructors in the rotatebutton class.
Any help is very much appreciated.

Answer 1

Use something like this:
class SomeWidget extends StatelessWidget {
final bool isRight;
const SomeWidget({Key key, this.isRight}) : super(key: key);
#override
Widget build(BuildContext context) {
return Container(
child: Icon(isRight?Icons.arrow_forward:Icons.arrow_back),
);
}
}