onListen property

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

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

Source

ControllerCallback get onListen;

void onListen=(void onListenHandler())

void set onListen(void onListenHandler());

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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-async/StreamController/onListen.html