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',
),
),
),
)
],
);
}
}
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,
I think you have already figured out the answer from the code. the solution is to declare bool value evaluate
in my case then on button click make that value true and setstate with that value and on the onChanged
prop of the RadioListTile
add this code:
onChanged: (value) => evaluate ? null : value = 0,
hope this was helpful!
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