OptionalVAlignmentUnaryFunction
class OptionalVAlignmentUnaryFunction<A, OA : ObservableValue<A>>(argA: OA, lambda: (A) -> VAlignment?) : UnaryFunction<VAlignment?, A, OA> , ObservableOptionalVAlignment
Boilerplate which avoids having to use generics.
Similar to VAlignmentUnaryFunction, but the value can also be null.