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   1  /*
   2  ---
   3  
   4  script: Class.Occlude.js
   5  
   6  name: Class.Occlude
   7  
   8  description: Prevents a class from being applied to a DOM element twice.
   9  
  10  license: MIT-style license.
  11  
  12  authors:
  13    - Aaron Newton
  14  
  15  requires: 
  16    - Core/Class
  17    - Core/Element
  18    - /MooTools.More
  19  
  20  provides: [Class.Occlude]
  21  
  22  ...
  23  */
  24  
  25  Class.Occlude = new Class({
  26  
  27      occlude: function(property, element){
  28          element = document.id(element || this.element);
  29          var instance = element.retrieve(property || this.property);
  30          if (instance && !$defined(this.occluded))
  31              return this.occluded = instance;
  32  
  33          this.occluded = false;
  34          element.store(property || this.property, this);
  35          return this.occluded;
  36      }
  37  
  38  });