switch_test.dart

/** 1 */
// Inside build method, in form widget
void toggleDropdownEnabled(bool val) {
  ref
      .read(providerTrackerDrowndownIndustrialDegree.notifier)
      .update((state) => val);
}

/** 2 */
// Inside form
CustomButtonSwitch(
  title: '🟫 ¿Es mineral industrializado?',
  subtitle: 'Según decreto Nº 525/2010',
  controller: _isIndustrializedMineral,
  onPressed: toggleDropdownEnabled,
),

/** 3 - SWITCH */
import 'package:flutter/material.dart';

class CustomButtonSwitch extends StatefulWidget {
  final String title;
  final String subtitle;
  final SwitchController controller;
  final void Function(bool)? onPressed;

  const CustomButtonSwitch({
    super.key,
    required this.title,
    required this.subtitle,
    required this.controller,
    this.onPressed,
  });

  @override
  State<StatefulWidget> createState() => _CustomButtonSwitchState();
}

class _CustomButtonSwitchState extends State<CustomButtonSwitch> {
  @override
  Widget build(BuildContext context) {
    final border = BorderRadius.circular(10);
    final colors = Theme.of(context).colorScheme;
    return Padding(
      padding: const EdgeInsets.all(8.0),
      child: SwitchListTile(
        contentPadding: const EdgeInsets.fromLTRB(15, 0, 15, 5),
        dense: false,
        title: Text(widget.title),
        subtitle: Text(widget.subtitle),
        value: widget.controller.isSwitchOn,
        shape: RoundedRectangleBorder(
            side: BorderSide(color: colors.onBackground), borderRadius: border),
        onChanged: (bool newValue) {
          setState(() {
            widget.onPressed!(newValue);
            widget.controller.setValue(newValue);
          });
        },
      ),
    );
  }
}

class SwitchController extends ChangeNotifier {
  late bool isSwitchOn = false;

  void setValue(bool value) {
    isSwitchOn = value;
  }
}