Flutter ElevatedButton onPressed functions Avoid using unnecessary statements - flutter

Question

I have a Flutter stateful widget inside a Stepper widget, and it looks like this:
The first step of the stepper widget has another widget as its content, and that widget is a stateful widget as below:
import 'package:flutter/material.dart';
class ConductorStart extends StatefulWidget {
const ConductorStart({
Key? key,
required this.continued,
}) : super(key: key);
final VoidCallback continued;
#override
ConductorStartState createState() => ConductorStartState();
}
class ConductorStartState extends State<ConductorStart> {
int _currentStep = 0;
bool _pressedButton = false;
void tapped() {
setState(() => _pressedButton = true);
}
#override
Widget build(BuildContext context) {
return Row(
children: <Widget>[
if (!_pressedButton)
ElevatedButton(
onPressed: () {
tapped;
widget.continued;
},
child: const Text('Continue'),
)
else
const SizedBox.shrink(),
],
);
}
}
The ElevatedButton has two functions when called: tapped, and widget.continued. tapped should make the button disappear. and widget.continued is a function from the parent widget that is supposed to make the parent widget to continue to step 2 when clicked. Currently the two functions have a warning of Avoid using unnecessary statements, and they do not get executed properly. When I click the continue button. Nothing happens. What did I do wrong here?

Answer 1

I'll totally go with Pat9RB. Just posting it here as an answer for others to quickly find the relevant issue.
Adding just definitions helps for adding a callback parameter in the constructor.
For Eg.: onPressed: myOnPressed;
where, onPressed needs a VoidCallback, and myOnPressed is a VoidCallback argument.
But, you need to call the function in order to execute it from any other function body.
Either call using .call() method, like, tapped!.call(); or append with callback syntax (), like, tapped();