onListen property
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 Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.13.0/dart-async/StreamController/onListen.html