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/*! Copyright (c) 2011 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: 3.0.6
 *
 * Requires: 1.2.2+
 */

(function ($) {
    var types = ["DOMMouseScroll", "mousewheel"];

if ($.event.fixHooks) {
        for (var i = types.length; i; ) {
            $.event.fixHooks[types[--i]] = $.event.mouseHooks;
        }
    }

$.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 (orgEvent.wheelDelta) {
            delta = orgEvent.wheelDelta / 120;
        }
        if (orgEvent.detail) {
            delta = -orgEvent.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.dispatch || $.event.handle).apply(this, args);
    }
})(jQuery);