interface MenuParentFormSelectorInterface

interface MenuParentFormSelectorInterface {
    
    /**
     * Gets the options for a select element to choose a menu and parent.
     *
     * @param string $id
     *   Optional ID of a link plugin. This will exclude the link and its
     *   children from the select options.
     * @param array $menus
     *   Optional array of menu names as keys and titles as values to limit
     *   the select options.  If NULL, all menus will be included.
     * @param \Drupal\Core\Cache\CacheableMetadata|null &$cacheability
     *   Optional cacheability metadata object, which will be populated based on
     *   the accessibility of the links and the cacheability of the links.
     *
     * @return array
     *   Keyed array where the keys are contain a menu name and parent ID and
     *   the values are a menu name or link title indented by depth.
     */
    public function getParentSelectOptions($id = '', array $menus = NULL, CacheableMetadata &$cacheability = NULL);
    
    /**
     * Gets a form element to choose a menu and parent.
     *
     * The specific type of form element will vary depending on the
     * implementation, but callers will normally need to set the #title for the
     * element.
     *
     * @param string $menu_parent
     *   A menu name and parent ID concatenated with a ':' character to use as the
     *   default value.
     * @param string $id
     *   (optional) ID of a link plugin. This will exclude the link and its
     *   children from being selected.
     * @param array $menus
     *   (optional) Array of menu names as keys and titles as values to limit
     *   the values that may be selected. If NULL, all menus will be included.
     *
     * @return array
     *   A form element to choose a parent, or an empty array if no possible
     *   parents exist for the given parameters. The resulting form value will be
     *   a single string containing the chosen menu name and parent ID separated
     *   by a ':' character.
     */
    public function parentSelectElement($menu_parent, $id = '', array $menus = NULL);

}