select<k> method Null safety

  1. @override
void select<k>(
  1. k value
)

select one item in group ( singeSelection/multiple selection) value : (dynamic) value of item that should selected

Implementation

@override
void select<k>(k value) {
  assert(!(value is List),
      "you should use `selectItems` instead of select is only for one value");
  assert(_widgetState.values.contains(value),
      "you cannot select  item that doesn't exist");

  switch (isMultipleSelection) {
    case true:
      _widgetState.selectValues(List.filled(1, value).cast<k>().toList());
      break;
    case false:
      final index = _widgetState.values.indexOf(value);
      _widgetState.notifierItems[index].value =
          _widgetState.notifierItems[index].value.copy(
        checked: true,
      );
      if (_widgetState.selectedValue.value != null) {
        final indexOld =
            _widgetState.values.indexOf(_widgetState.selectedValue.value);
        if (indexOld != -1) {
          _widgetState.notifierItems[indexOld].value =
              _widgetState.notifierItems[indexOld].value.copy(
            checked: false,
          );
        }
      }
      _widgetState.selectedValue.value = value;
      break;
  }
}