generic-dialog-in-flutter.dart

typedef DialogOptionBuilder<T> = Map<String, T> Function();

Future<T?> showGenericDialog<T>({
  required BuildContext context,
  required String title,
  required String content,
  required DialogOptionBuilder optionsBuilder,
}) {
  final options = optionsBuilder();
  return showDialog<T>(
    context: context,
    builder: (context) {
      return AlertDialog(
        title: Text(title),
        content: Text(content),
        actions: options.keys.map(
          (optionTitle) {
            final T value = options[optionTitle];
            return TextButton(
              onPressed: () {
                Navigator.of(context).pop(value);
              },
              child: Text(optionTitle),
            );
          },
        ).toList(),
      );
    },
  );
}

Future<bool> showLogOutDialog(BuildContext context) {
  return showGenericDialog<bool>(
    context: context,
    title: 'Log out',
    content: 'Are you sure you want to log out?',
    optionsBuilder: () => {
      'Cancel': false,
      'Log out': true,
    },
  ).then(
    (value) => value ?? false,
  );
}