onChange abstract method

StreamSubscription<Metadata> onChange(
  1. void handler(
    1. Metadata metadata
    )
)

Listens for Metadata changes.

This method returns a StreamSubscription that allows you to stop listening for changes when it's no longer needed by calling StreamSubscription.cancel.

handler is a callback that will be called whenever the metadata changes. If during the method call current metadata is available, the handler will be called right away.

Implementation

StreamSubscription<Metadata> onChange(
  void Function(Metadata metadata) handler,
);