showChoicesButtonDialog<T> function Null safety

Future<T?> showChoicesButtonDialog<T>(
  1. BuildContext context,
  2. {Key? key,
  3. required Widget title,
  4. Widget? content,
  5. required List<DialogChoice<T>> choices,
  6. Widget? cancelWidget,
  7. bool barrierDismissible = false,
  8. Color? barrierColor,
  9. bool useSafeArea = true,
  10. bool useRootNavigator = true,
  11. RouteSettings? routeSettings}

Displays a dialog with the choices informed in the parameter choices similar to a ListTile.

This dialog will be closed the moment you click on one of the choices listed on the screen, or when the Cancel button is clicked.

Example of using the dialog:

String result = await showChoicesButtonDialog<String>(context,
    title: Text('Select user'),
    choices: [
            icon: Icon(Icons.person),
            title: Text('Ricardo Crescenti'),
            subtitle: Text(''),
            value: 'ricardo.crescenti'),
            icon: Icon(Icons.person),
            title: Text('Ana Luiza Crescenti'),
            subtitle: Text(''),
            value: 'analuiza.crescenti'),
            icon: Icon(Icons.person),
            title: Text('Luis Otávio Crescenti'),
            subtitle: Text(''),
            value: 'luisotavio.crescenti'),
            icon: Icon(Icons.add),
            title: Text('Add new account'),
            value: ''),

if (result != null) {
    showBasicDialog(context, title: Text('Selected user'), content: Text(result));


Future<T?> showChoicesButtonDialog<T>(BuildContext context,
    {Key? key,
    required Widget title,
    Widget? content,
    required List<DialogChoice<T>> choices,
    Widget? cancelWidget,
    bool barrierDismissible = false,
    Color? barrierColor,
    bool useSafeArea = true,
    bool useRootNavigator = true,
    RouteSettings? routeSettings}) async {
  List<T>? result = await _showChoicesDialog<T>(context,
      title: title,
      content: content,
      choiceType: DialogChoicesType.button,
      choices: choices,
      cancelWidget: cancelWidget,
      barrierDismissible: barrierDismissible,
      barrierColor: barrierColor,
      useSafeArea: useSafeArea,
      useRootNavigator: useRootNavigator,
      routeSettings: routeSettings);

  return (result != null && result.isNotEmpty ? result[0] : null);