addListener method
Subscribes to this object.
The listener
callback will be called whenever state changes.
To remove this listener
, call the function returned by addListener
final removeListener = example.addListener((value) => ...);
removeListener();
Implementation
RemoveListener addListener(ListenerCallback<State> listener) {
final listenerEntry = _ListenerEntry(listener);
_listeners.add(listenerEntry);
return () {
if (listenerEntry.list != null) {
listenerEntry.unlink();
}
};
}