/*! Copyright (c) 2010 Brandon Aaron (http://brandonaaron.net)
 * Licensed under the MIT License (LICENSE.txt).
 *
 * Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
 * Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
 * Thanks to: Seamus Leahy for adding deltaX and deltaY
 *
 * Version: 3.0.4
 * 
 * Requires: 1.2.2+
 */
(function($) {
	var types = ['DOMMouseScroll', 'mousewheel'];
	$.event.special.mousewheel = {
		setup: function() {
			if (this.addEventListener) {
				for (var i = types.length; i;) {
					this.addEventListener(types[--i], handler, false);
				}
			} else {
				this.onmousewheel = handler;
			}
		},
		teardown: function() {
			if (this.removeEventListener) {
				for (var i = types.length; i;) {
					this.removeEventListener(types[--i], handler, false);
				}
			} else {
				this.onmousewheel = null;
			}
		}
	};
	$.fn.extend({
		mousewheel: function(fn) {
			return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
		},
		unmousewheel: function(fn) {
			return this.unbind("mousewheel", fn);
		}
	});

	function handler(event) {
		var orgEvent = event || window.event,
			args = [].slice.call(arguments, 1),
			delta = 0,
			returnValue = true,
			deltaX = 0,
			deltaY = 0;
		event = $.event.fix(orgEvent);
		event.type = "mousewheel"; // Old school scrollwheel delta
		if (event.wheelDelta) {
			delta = event.wheelDelta / 120;
		}
		if (event.detail) {
			delta = -event.detail / 3;
		} // New school multidimensional scroll (touchpads) deltas
		deltaY = delta; // Gecko
		if (orgEvent.axis !== undefined && orgEvent.axis === orgEvent.HORIZONTAL_AXIS) {
			deltaY = 0;
			deltaX = -1 * delta;
		} // Webkit
		if (orgEvent.wheelDeltaY !== undefined) {
			deltaY = orgEvent.wheelDeltaY / 120;
		}
		if (orgEvent.wheelDeltaX !== undefined) {
			deltaX = -1 * orgEvent.wheelDeltaX / 120;
		} // Add event and delta to the front of the arguments
		args.unshift(event, delta, deltaX, deltaY);
		return $.event.handle.apply(this, args);
	}
})(jQuery);