/*! 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);