context: proto._modifyOrientation = function(propValue, propOldValue, propData){  // update fast access variables  this._layoutHorizontal = propValue == QxConst.ORIENTATION_HORIZONTAL;  this._layoutVertical = propValue == QxConst.ORIENTATION_VERTICAL;  // Layout Implementation  if (this._layoutImpl)  {    this._layoutImpl.dispose();    this._layoutImpl = null;  };  if (QxUtil.isValidString(propValue)) {    this._layoutImpl = this._createLayoutImpl();  };    // call other core modifier  return this._modifyLayoutOrder();};
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