whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(bool autoShow, RefreshController<T>? controller, SearchSupportCoreUiBuild childBuilder, SearchSupportActionListening? listening,)?)

A variant of when that fallback to returning null

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  TResult? Function(
          bool autoShow,
          RefreshController<T>? controller,
          SearchSupportCoreUiBuild childBuilder,
          SearchSupportActionListening? listening)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _SearchSupportParams() when $default != null:
      return $default(_that.autoShow, _that.controller, _that.childBuilder,
          _that.listening);
    case _:
      return null;
  }
}