whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. @Size2DConverter() Size2D artboardSize,
    2. @CanvasFillConverter() @JsonKey.new(required: true, disallowNullValue: true) CanvasFill backgroundFill,
    3. @JsonKey.new(required: true, disallowNullValue: true) double backgroundOpacity,
    4. List<Node> children,
    )?
)

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(@Size2DConverter()  Size2D artboardSize, @CanvasFillConverter()@JsonKey(required: true, disallowNullValue: true)  CanvasFill backgroundFill, @JsonKey(required: true, disallowNullValue: true)  double backgroundOpacity,  List<Node> children)?  $default,) {final _that = this;
switch (_that) {
case _CanvasSceneDocument() when $default != null:
return $default(_that.artboardSize,_that.backgroundFill,_that.backgroundOpacity,_that.children);case _:
  return null;

}
}