method ensureSemantics

Source

SemanticsHandle ensureSemantics({ VoidCallback listener }) {
  if (_outstandingSemanticsHandle++ == 0) {
    assert(_semanticsOwner == null);
    _semanticsOwner = new SemanticsOwner();
    if (onSemanticsOwnerCreated != null)
      onSemanticsOwnerCreated();
  }
  return new SemanticsHandle._(this, listener);
}