/*! 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);