when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. Duration duration,
    2. Widget leadingIcon,
    3. bool floating,
    4. EdgeInsets margin,
    5. double radius,
    6. String? actionLabel,
    )
)

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs TResult when<TResult extends Object?>(TResult Function( Duration duration,  Widget leadingIcon,  bool floating,  EdgeInsets margin,  double radius,  String? actionLabel)  $default,) {final _that = this;
switch (_that) {
case _XSnackbarConfig():
return $default(_that.duration,_that.leadingIcon,_that.floating,_that.margin,_that.radius,_that.actionLabel);case _:
  throw StateError('Unexpected subclass');

}
}