onListen property

(void Function?()?) onListen

read / write

The callback which is called when the stream is listened to.

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

Implementation

abstract void Function()? onListen;

© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-async/StreamController/onListen.html