whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String contentText,
    2. String okText,
    3. String cancelText,
    4. Widget? content,
    5. Widget? title,
    )?
)

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(String contentText, String okText, String cancelText,
          @igFreezedJson Widget? content, @igFreezedJson Widget? title)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _AskOkDialogParams() when $default != null:
      return $default(_that.contentText, _that.okText, _that.cancelText,
          _that.content, _that.title);
    case _:
      return null;
  }
}