addGroup method Null safety

void addGroup(
  1. CowGroup _
)

Implementation

void addGroup(CowGroup _) {
  TextEditingController controller = TextEditingController()..text = _.name;
  FocusNode focusNode = FocusNode();
  controller.addListener(() => onChangeCowGroupName(_, controller.text));
  _.controller = controller;
  _.focusNode = focusNode;
  _cowGroups.add(_);
  notifyListeners();
}