js/jquery/jquery.mousewheel.js

   1 /*! Copyright (c) 2010 Brandon Aaron (http://brandonaaron.net)
   2  * Licensed under the MIT License (LICENSE.txt).
   3  *
   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  * Thanks to: Seamus Leahy for adding deltaX and deltaY
   7  *
   8  * Version: 3.0.4
   9  *
  10  * Requires: 1.2.2+
  11  */
  12
  13 (function($) {
  14
  15 var types = ['DOMMouseScroll', 'mousewheel'];
  16
  17 $.event.special.mousewheel = {
  18     setup: function() {
  19         if ( this.addEventListener ) {
  20             for ( var i=types.length; i; ) {
  21                 this.addEventListener( types[--i], handler, false );
  22             }
  23         } else {
  24             this.onmousewheel = handler;
  25         }
  26     },
  27
  28     teardown: function() {
  29         if ( this.removeEventListener ) {
  30             for ( var i=types.length; i; ) {
  31                 this.removeEventListener( types[--i], handler, false );
  32             }
  33         } else {
  34             this.onmousewheel = null;
  35         }
  36     }
  37 };
  38
  39 $.fn.extend({
  40     mousewheel: function(fn) {
  41         return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
  42     },
  43
  44     unmousewheel: function(fn) {
  45         return this.unbind("mousewheel", fn);
  46     }
  47 });
  48
  49
  50 function handler(event) {
  51     var orgEvent = event || window.event, args = [].slice.call( arguments, 1 ), delta = 0, returnValue = true, deltaX = 0, deltaY = 0;
  52     event = $.event.fix(orgEvent);
  53     event.type = "mousewheel";
  54
  55     // Old school scrollwheel delta
  56     if ( event.wheelDelta ) { delta = event.wheelDelta/120; }
  57     if ( event.detail     ) { delta = -event.detail/3; }
  58
  59     // New school multidimensional scroll (touchpads) deltas
  60     deltaY = delta;
  61
  62     // Gecko
  63     if ( orgEvent.axis !== undefined && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
  64         deltaY = 0;
  65         deltaX = -1*delta;
  66     }
  67
  68     // Webkit
  69     if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY/120; }
  70     if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = -1*orgEvent.wheelDeltaX/120; }
  71
  72     // Add event and delta to the front of the arguments
  73     args.unshift(event, delta, deltaX, deltaY);
  74
  75     return $.event.handle.apply(this, args);
  76 }
  77
  78 })(jQuery);