addListener method
Register a closure to be called when the object notifies its listeners.
Implementation
@override
@mustCallSuper
void addListener(VoidCallback callback) {
_notifier.addListener(callback);
}
Register a closure to be called when the object notifies its listeners.
@override
@mustCallSuper
void addListener(VoidCallback callback) {
_notifier.addListener(callback);
}