when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. Set<double> selectedRowIds,
    2. double? focusedRowId,
    3. Set<String> selectedCellIds,
    4. SelectionMode mode,
    )
)

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( Set<double> selectedRowIds,  double? focusedRowId,  Set<String> selectedCellIds,  SelectionMode mode)  $default,) {final _that = this;
switch (_that) {
case _SelectionState():
return $default(_that.selectedRowIds,_that.focusedRowId,_that.selectedCellIds,_that.mode);case _:
  throw StateError('Unexpected subclass');

}
}