completeOperation method

void completeOperation(CancelableOperation<T> result, { bool propagateCancel = true, })

Makes this CancelableCompleter.operation complete with the same result as result.

If propagateCancel is true (the default), and the operation of this completer is canceled before result completes, then result is also canceled.

Implementation

void completeOperation(CancelableOperation<T> result,
    {bool propagateCancel = true}) {
  if (!_mayComplete) throw StateError('Already completed');
  _mayComplete = false;
  if (isCanceled) {
    if (propagateCancel) result.cancel();
    result.value.ignore();
    return;
  }
  result.then<void>((value) {
    _inner?.complete(
        value); // _inner is set to null if this.operation is cancelled.
  }, onError: (error, stack) {
    _inner?.completeError(error, stack);
  }, onCancel: () {
    operation.cancel();
  });
  if (propagateCancel) {
    _cancelCompleter?.future.whenComplete(result.cancel);
  }
}