/*
---

script: Group.js

name: Group

description: Class for monitoring collections of events

license: MIT-style license

authors:
  - Valerio Proietti

requires:
  - Core/Events
  - /MooTools.More

provides: [Group]

...
*/

(function(){

this.Group = new Class({

	initialize: function(){
		this.instances = Array.flatten(arguments);
	},

	addEvent: function(type, fn){
		var instances = this.instances,
			len = instances.length,
			togo = len,
			args = new Array(len),
			self = this;

		instances.each(function(instance, i){
			instance.addEvent(type, function(){
				if (!args[i]) togo--;
				args[i] = arguments;
				if (!togo){
					fn.call(self, instances, instance, args);
					togo = len;
					args = new Array(len);
				}
			});
		});
	}

});

})();