"

From 2014.igem.org

/*! 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);