git.sur5r.net Git - i3/i3.github.io/blob - js/jquery.mousewheel.js

   1 /*! Copyright (c) 2009 Brandon Aaron (http://brandonaaron.net)
   2  * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
   3  * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
   4  * Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
   5  * Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
   6  *
   7  * Version: 3.0.2
   8  *
   9  * Requires: 1.2.2+
  10  */
  11
  12 (function($) {
  13
  14 var types = ['DOMMouseScroll', 'mousewheel'];
  15
  16 $.event.special.mousewheel = {
  17         setup: function() {
  18                 if ( this.addEventListener )
  19                         for ( var i=types.length; i; )
  20                                 this.addEventListener( types[--i], handler, false );
  21                 else
  22                         this.onmousewheel = handler;
  23         },
  24
  25         teardown: function() {
  26                 if ( this.removeEventListener )
  27                         for ( var i=types.length; i; )
  28                                 this.removeEventListener( types[--i], handler, false );
  29                 else
  30                         this.onmousewheel = null;
  31         }
  32 };
  33
  34 $.fn.extend({
  35         mousewheel: function(fn) {
  36                 return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
  37         },
  38
  39         unmousewheel: function(fn) {
  40                 return this.unbind("mousewheel", fn);
  41         }
  42 });
  43
  44
  45 function handler(event) {
  46         var args = [].slice.call( arguments, 1 ), delta = 0, returnValue = true;
  47
  48         event = $.event.fix(event || window.event);
  49         event.type = "mousewheel";
  50
  51         if ( event.wheelDelta ) delta = event.wheelDelta/120;
  52         if ( event.detail     ) delta = -event.detail/3;
  53
  54         // Add events and delta to the front of the arguments
  55         args.unshift(event, delta);
  56
  57         return $.event.handle.apply(this, args);
  58 }
  59
  60 })(jQuery);