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   1  /*
   2  YUI 3.17.2 (build 9c3c78e)
   3  Copyright 2014 Yahoo! Inc. All rights reserved.
   4  Licensed under the BSD License.
   5  http://yuilibrary.com/license/
   6  */
   7  
   8  YUI.add('event-mousewheel', function (Y, NAME) {
   9  
  10  /**
  11   * Adds mousewheel event support
  12   * @module event
  13   * @submodule event-mousewheel
  14   */
  15  var DOM_MOUSE_SCROLL = 'DOMMouseScroll',
  16      fixArgs = function(args) {
  17          var a = Y.Array(args, 0, true), target;
  18          if (Y.UA.gecko) {
  19              a[0] = DOM_MOUSE_SCROLL;
  20              target = Y.config.win;
  21          } else {
  22              target = Y.config.doc;
  23          }
  24  
  25          if (a.length < 3) {
  26              a[2] = target;
  27          } else {
  28              a.splice(2, 0, target);
  29          }
  30  
  31          return a;
  32      };
  33  
  34  /**
  35   * Mousewheel event.  This listener is automatically attached to the
  36   * correct target, so one should not be supplied.  Mouse wheel
  37   * direction and velocity is stored in the 'wheelDelta' field.
  38   * @event mousewheel
  39   * @param type {string} 'mousewheel'
  40   * @param fn {function} the callback to execute
  41   * @param context optional context object
  42   * @param args 0..n additional arguments to provide to the listener.
  43   * @return {EventHandle} the detach handle
  44   * @for YUI
  45   */
  46  Y.Env.evt.plugins.mousewheel = {
  47      on: function() {
  48          return Y.Event._attach(fixArgs(arguments));
  49      },
  50  
  51      detach: function() {
  52          return Y.Event.detach.apply(Y.Event, fixArgs(arguments));
  53      }
  54  };
  55  
  56  
  57  }, '3.17.2', {"requires": ["node-base"]});