protected function _connectTotalCodeVar()
 {
     $_code_var = array();
     foreach ($_code_var as $key => $value) {
         $this->_totalCodeVars[$key] = '{{var ' . $this->_var_prefix . '_' . $value . '}}';
     }
     parent::_connectTotalCodeVar();
     return $this;
 }
 public function __construct()
 {
     $this->_var_prefix = Magestore_Pdfinvoiceplus_Helper_Variable::_PRE_VAR_ORDER;
     parent::__construct();
 }