I want to make dropdown in expandable in all time in flutter, - flutter

Question

I want to make this dropdown all time expandable state, don't need to un-expandable state. i want to hide or remove un-expandable state in dropdown and i want to show all time expandable to make true, its possible, is have any idea about it, please add it.
for exapmple, user click the dropdown right icon, don;t need to hide the dropdown items. how to do this

Answer 1

to achieve that design you can made a custom design for it. from what you explain the result should be done like this
and here is the custom code that I've created
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
final fieldText = TextEditingController();
MyApp({Key? key}) : super(key: key);
void clearText() {
fieldText.clear();
}
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(body: SafeArea(child: ListviewWithCheckBox()))
);
}
}
class ListviewWithCheckBox extends StatefulWidget {
#override
_ListviewWithCheckBoxState createState() => _ListviewWithCheckBoxState();
}
class _ListviewWithCheckBoxState extends State<ListviewWithCheckBox> {
List<String> _texts = [
"T-701 - ZONE 1/2/3",
"Slide Valves on 1st deck",
"F-301 - South side",
"Regen - 13th floor",
];
late List<bool> _isChecked;
#override
void initState() {
super.initState();
_isChecked = List<bool>.filled(_texts.length, false);
}
#override
Widget build(BuildContext context) {
return SingleChildScrollView(
child: Column(
children: [
CheckboxListTile(
controlAffinity: ListTileControlAffinity.leading,
title: Text('Oil_and_gas'),
value: false,
onChanged: (val) {
setState(
() {
// ....
},
);
},
),
Padding(
padding: const EdgeInsets.symmetric(horizontal: 30.0),
child: ListView.builder(
shrinkWrap: true,
primary: false,
itemCount: _texts.length,
itemBuilder: (context, index) {
return CheckboxListTile(
controlAffinity: ListTileControlAffinity.leading,
title: Text(_texts[index]),
value: _isChecked[index],
onChanged: (val) {
setState(
() {
// .....
},
);
},
);
},
),
),
],
),
);
}
}
that should work like a charm now