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I'm using the RadioListTile widget in my application and I want to disable changing the value after some condition is satisfied. and there is no isButtonDisabled prop just like in Radio widget. how can I disable this widget(stop the value from changing)?
By the time I was writing the above statement I figured it out and it was easy. so Ill post the question and will answer it below.
import 'package:flutter/material.dart';
class Body extends StatefulWidget {
@override
_BodyState createState() => _BodyState();
}
class _BodyState extends State<Body> {
bool evaluate = false;
int value;
@override
Widget build(BuildContext context) {
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.start,
children: [
RadioListTile<int>(
value: 0,
isThreeLine: false,
title: Text(
'radio 1',
style: TextStyle(
fontWeight: FontWeight.bold,
),
),
groupValue: value,
onChanged: (value) => evaluate ? null : value = 0,
activeColor: Colors.green,
),
RadioListTile<int>(
value: 1,
isThreeLine: false,
title: Text(
'radio 2',
style: TextStyle(
fontWeight: FontWeight.bold,
),
),
groupValue: value,
onChanged: (value) => evaluate ? null : value = 1,
activeColor: Colors.green,
),
InkWell(
onTap: () {
evaluate = true;
},
child: Container(
child: Center(
child: Text(
'Submit answer',
),
),
),
)
],
);
}
}
246
Whenever onChange is null the component will become disabled. You should be able to do something link this instead:
onChanged: evaluate ? null : (value) => value = 0,
I would also rename evaluate to make it easier to understand, something like alreadyProvided, notAllowed, disabled or whatever makes sense, the most important thing is to really represent why it can't be changed.
In the end it could look like:
onChanged: alreadyProvided ? null : (value) => value = 0,
answered Oct 20 '22 03:10
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