showCountryPickerDialog function Null safety

Future<Country?> showCountryPickerDialog(
  1. BuildContext context,
  2. {Widget? title,
  3. double cornerRadius = 35,
  4. bool focusSearchBox = false}
)

Implementation

Future<Country?> showCountryPickerDialog(
  BuildContext context, {
  Widget? title,
  double cornerRadius: 35,
  bool focusSearchBox: false,
}) {
  return showDialog<Country?>(
      context: context,
      barrierDismissible: true,
      builder: (_) => Dialog(
            shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.all(
              Radius.circular(cornerRadius),
            )),
            child: Column(
              children: <Widget>[
                SizedBox(height: 16),
                Stack(
                  children: <Widget>[
                    Positioned(
                      right: 8,
                      top: 4,
                      bottom: 0,
                      child: TextButton(
                          child: Text('Cancel'),
                          onPressed: () => Navigator.pop(context)),
                    ),
                    Center(
                      child: title ??
                          Text(
                            'Choose region',
                            textAlign: TextAlign.center,
                            style: TextStyle(
                              fontSize: 25,
                              fontWeight: FontWeight.w500,
                            ),
                          ),
                    ),
                  ],
                ),
                SizedBox(height: 16),
                Expanded(
                  child: CountryPickerWidget(
                    onSelected: (country) => Navigator.of(context).pop(country),
                  ),
                ),
              ],
            ),
          ));
}