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   1  /*! Copyright (c) 2011 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: 3.0.6
   9   * 
  10   * Requires: 1.2.2+
  11   */
  12  
  13  (function($) {
  14  
  15  var types = ['DOMMouseScroll', 'mousewheel'];
  16  
  17  if ($.event.fixHooks) {
  18      for ( var i=types.length; i; ) {
  19          $.event.fixHooks[ types[--i] ] = $.event.mouseHooks;
  20      }
  21  }
  22  
  23  $.event.special.mousewheel = {
  24      setup: function() {
  25          if ( this.addEventListener ) {
  26              for ( var i=types.length; i; ) {
  27                  this.addEventListener( types[--i], handler, false );
  28              }
  29          } else {
  30              this.onmousewheel = handler;
  31          }
  32      },
  33      
  34      teardown: function() {
  35          if ( this.removeEventListener ) {
  36              for ( var i=types.length; i; ) {
  37                  this.removeEventListener( types[--i], handler, false );
  38              }
  39          } else {
  40              this.onmousewheel = null;
  41          }
  42      }
  43  };
  44  
  45  $.fn.extend({
  46      mousewheel: function(fn) {
  47          return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
  48      },
  49      
  50      unmousewheel: function(fn) {
  51          return this.unbind("mousewheel", fn);
  52      }
  53  });
  54  
  55  
  56  function handler(event) {
  57      var orgEvent = event || window.event, args = [].slice.call( arguments, 1 ), delta = 0, returnValue = true, deltaX = 0, deltaY = 0;
  58      event = $.event.fix(orgEvent);
  59      event.type = "mousewheel";
  60      
  61      // Old school scrollwheel delta
  62      if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta/120; }
  63      if ( orgEvent.detail     ) { delta = -orgEvent.detail/3; }
  64      
  65      // New school multidimensional scroll (touchpads) deltas
  66      deltaY = delta;
  67      
  68      // Gecko
  69      if ( orgEvent.axis !== undefined && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
  70          deltaY = 0;
  71          deltaX = -1*delta;
  72      }
  73      
  74      // Webkit
  75      if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY/120; }
  76      if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = -1*orgEvent.wheelDeltaX/120; }
  77      
  78      // Add event and delta to the front of the arguments
  79      args.unshift(event, delta, deltaX, deltaY);
  80      
  81      return ($.event.dispatch || $.event.handle).apply(this, args);
  82  }
  83  
  84  })(jQuery);