NotificationCenter

NotificationCenter handles messages and distributes them to all observers.

How to use

NotificationCenter facilitates communications between classes or plugins that do not know about each other.

When a class posts a notification, all observers are notified. The object posting the notification does not need to know anything about the observers.

var MyTabController = new Class({
	// Tab controller code here
	activateTab: function(tab) {
		// set styles, etc
		NotificationCenter.postNotification('TabActivated', { controller: this, tab: tab });
	}
});

An object can add itself as an observer for a notification by passing a callback function that will be executed when another object posts that notification.

var MyVideoPlayer = new Class({
	initialize: function() {
		// Video player code here
		NotificationCenter.addObserver('TabActivated', function(message) {
			if (message.tab.id === '#video') {
				this.restartPlayer();
			}
		})
	}
});

An object can post notifications to all listeners using the wildcard ''. Additionaly, an object can observe all notifications using the '' wildcard.

var MyBroadcaster = new Class({
	initialize: function() {
		// Notify all observers
		NotificationCenter.postNotification('*', {msg: 'Broadcaster initialized!'});
	}
});

var MySpy = new Class({
	initialize: function() {
		NotificationCenter.addObserver('*', this.logNotification.bind(this));
	},
	logNotification: function(message) {
		console.dir(message);
	}
});