OnClosedEvent class
class OnClosedEvent {
 final String notificationId;
 final bool byUser;
 OnClosedEvent(this.notificationId, this.byUser);
}
Constructors
new OnClosedEvent(String notificationId, bool byUser) #
Creates a new Object instance.
Object instances have no meaningful state, and are only useful
through their identity. An Object instance is equal to itself
only.
docs inherited from Object 
OnClosedEvent(this.notificationId, this.byUser);