onCancel property
read / write
The callback which is called when the stream is canceled.
May be set to null, in which case no callback will happen.
Implementation
abstract FutureOr<void> Function()? onCancel;
© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.19.6/dart-async/StreamController/onCancel.html
