when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String? surfaceColor,
    2. String? botBubbleColor,
    3. String? userBubbleColor,
    4. String? botTextColor,
    5. String? userTextColor,
    )
)

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( String? surfaceColor,  String? botBubbleColor,  String? userBubbleColor,  String? botTextColor,  String? userTextColor)  $default,) {final _that = this;
switch (_that) {
case _ChatAppearance():
return $default(_that.surfaceColor,_that.botBubbleColor,_that.userBubbleColor,_that.botTextColor,_that.userTextColor);case _:
  throw StateError('Unexpected subclass');

}
}