Basic dart only observer pattern without any special features.

Features

• pass context through update arguments

Usage

• Inheritance from observer/observable
• Add observer to observable instances
• Call notifyObservers form the observable instance

//create observer
final observer = ObserverX();

//create observable and both observer
final observable = ObservableX();
observable.addObserver(observer);

//notifies all observer
observable.notifyObservers(/*arguments*/);

Checkout example or test for detailed information.