protected function _getListDisplayType()
    {
        $listDisplayType = \OxidEsales\Eshop\Core\Registry::getSession()->getVariable('ldtype');

        if (is_null($listDisplayType)) {
            $listDisplayType = \OxidEsales\Eshop\Core\Registry::getConfig()->getConfigParam('sDefaultListDisplayType');
        }

        return $listDisplayType;
    }