public function getKeysOfHiddenSubparts()
    {
        $keysToHide = [];

        foreach ($this->nodes as $key => $node) {
            if (!$node->isVisible()) {
                $keysToHide[] = $key;
            }
        }

        return $keysToHide;
    }
public function getKeysOfHiddenSubparts()
    {
        $keysToHide = [];

        foreach ($this->nodes as $key => $node) {
            if (!$node->isVisible()) {
                $keysToHide[] = $key;
            }
        }

        return $keysToHide;
    }
public function getKeysOfHiddenSubparts ( ) { $ keysToHide = [ ] ; foreach ( $ this -> nodes as $ key => $ node ) { if ( ! $ node -> isVisible ( ) ) { $ keysToHide [ ] = $ key ; } } return $ keysToHide ; }
Creates a numeric array of all subparts that still are hidden.

The output of this function can be used for
\Tx_Oelib_Template::hideSubpartsArray.

@return string[] the key of the subparts which are hidden, will be empty if no elements are hidden
Creates a numeric array of all subparts that still are hidden .