onCancel property Null safety

ControllerCancelCallback? onCancel
override

The callback which is called when the stream is canceled.

May be set to null, in which case no callback will happen.

Implementation

@override
ControllerCancelCallback? get onCancel => _controller.onCancel;
void onCancel=(ControllerCancelCallback? onCancelHandler)
override

The callback which is called when the stream is canceled.

May be set to null, in which case no callback will happen.

Implementation

@override
set onCancel(ControllerCancelCallback? onCancelHandler) {
  _controller.onCancel = onCancelHandler;
}