Extends ART.Element with listen/ignore event subscriptions.

ART.Events.js

/*
---
name: ART.Events
description: "Extends ART.Element with listen/ignore event subscriptions."
requires: [ART/ART.Element, More/Table]
provides: [ART.Events]
...
*/

ART.Element.implement({

	/* events */

	listen: function(type, fn){
		if (!this._events) this._events = {};

		if (typeof type != 'string'){ // listen type / fn with object
			for (var t in type) this.listen(t, type[t]);
		} else { // listen to one
			if (!this._events[type]) this._events[type] = new Table;
			var events = this._events[type];
			if (events.get(fn)) return this;
			var bound = fn.bind(this);
			events.set(fn, bound);
			var element = this.element;
			if (element.addEventListener) element.addEventListener(type, bound, false);
			else element.attachEvent('on' + type, bound);
		}

		return this;
	},

	ignore: function(type, fn){
		if (!this._events) return this;

		if (typeof type != 'string'){ // ignore type / fn with object
			for (var t in type) this.ignore(t, type[t]);
			return this;
		}

		var events = this._events[type];
		if (!events) return this;

		if (fn == null){ // ignore every of type
			events.each(function(fn, bound){
				this.ignore(type, fn);
			}, this);
		} else { // ignore one
			var bound = events.get(fn);
			if (!bound) return this;
			var element = this.element;
			if (element.removeEventListener) element.removeEventListener(type, bound, false);
			else element.detachEvent('on' + type, bound);
		}

		return this;
	}

});