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<?php
namespace Drupal\Core\Menu;
use Drupal\Core\Cache\CacheableMetadata;
use Drupal\Core\Entity\EntityManagerInterface;
use Drupal\Component\Utility\Unicode;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\Core\StringTranslation\TranslationInterface;
/**
* Default implementation of the menu parent form selector service.
*
* The form selector is a list of all appropriate menu links.
*/
class MenuParentFormSelector implements MenuParentFormSelectorInterface {
use StringTranslationTrait;
/**
* The menu link tree service.
*
* @var \Drupal\Core\Menu\MenuLinkTreeInterface
*/
protected $menuLinkTree;
/**
* The entity manager.
*
* @var \Drupal\Core\Entity\EntityManagerInterface
*/
protected $entityManager;
/**
* Constructs a \Drupal\Core\Menu\MenuParentFormSelector
*
* @param \Drupal\Core\Menu\MenuLinkTreeInterface $menu_link_tree
* The menu link tree service.
* @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
* The entity manager.
* @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
* The string translation service.
*/
public function __construct(MenuLinkTreeInterface $menu_link_tree, EntityManagerInterface $entity_manager, TranslationInterface $string_translation) {
$this->menuLinkTree = $menu_link_tree;
$this->entityManager = $entity_manager;
$this->stringTranslation = $string_translation;
}
/**
* {@inheritdoc}
*/
public function getParentSelectOptions($id = '', array $menus = NULL, CacheableMetadata &$cacheability = NULL) {
if (!isset($menus)) {
$menus = $this->getMenuOptions();
}
$options = [];
$depth_limit = $this->getParentDepthLimit($id);
foreach ($menus as $menu_name => $menu_title) {
$options[$menu_name . ':'] = '<' . $menu_title . '>';
$parameters = new MenuTreeParameters();
$parameters->setMaxDepth($depth_limit);
$tree = $this->menuLinkTree->load($menu_name, $parameters);
$manipulators = [
['callable' => 'menu.default_tree_manipulators:checkNodeAccess'],
['callable' => 'menu.default_tree_manipulators:checkAccess'],
['callable' => 'menu.default_tree_manipulators:generateIndexAndSort'],
];
$tree = $this->menuLinkTree->transform($tree, $manipulators);
$this->parentSelectOptionsTreeWalk($tree, $menu_name, '--', $options, $id, $depth_limit, $cacheability);
}
return $options;
}
/**
* {@inheritdoc}
*/
public function parentSelectElement($menu_parent, $id = '', array $menus = NULL) {
$options_cacheability = new CacheableMetadata();
$options = $this->getParentSelectOptions($id, $menus, $options_cacheability);
// If no options were found, there is nothing to select.
if ($options) {
$element = [
'#type' => 'select',
'#options' => $options,
];
if (!isset($options[$menu_parent])) {
// The requested menu parent cannot be found in the menu anymore. Try
// setting it to the top level in the current menu.
list($menu_name, $parent) = explode(':', $menu_parent, 2);
$menu_parent = $menu_name . ':';
}
if (isset($options[$menu_parent])) {
// Only provide the default value if it is valid among the options.
$element += ['#default_value' => $menu_parent];
}
$options_cacheability->applyTo($element);
return $element;
}
return [];
}
/**
* Returns the maximum depth of the possible parents of the menu link.
*
* @param string $id
* The menu link plugin ID or an empty value for a new link.
*
* @return int
* The depth related to the depth of the given menu link.
*/
protected function getParentDepthLimit($id) {
if ($id) {
$limit = $this->menuLinkTree->maxDepth() - $this->menuLinkTree->getSubtreeHeight($id);
}
else {
$limit = $this->menuLinkTree->maxDepth() - 1;
}
return $limit;
}
/**
* Iterates over all items in the tree to prepare the parents select options.
*
* @param \Drupal\Core\Menu\MenuLinkTreeElement[] $tree
* The menu tree.
* @param string $menu_name
* The menu name.
* @param string $indent
* The indentation string used for the label.
* @param array $options
* The select options.
* @param string $exclude
* An excluded menu link.
* @param int $depth_limit
* The maximum depth of menu links considered for the select options.
* @param \Drupal\Core\Cache\CacheableMetadata|null &$cacheability
* The object to add cacheability metadata to, if not NULL.
*/
protected function parentSelectOptionsTreeWalk(array $tree, $menu_name, $indent, array &$options, $exclude, $depth_limit, CacheableMetadata &$cacheability = NULL) {
foreach ($tree as $element) {
if ($element->depth > $depth_limit) {
// Don't iterate through any links on this level.
break;
}
// Collect the cacheability metadata of the access result, as well as the
// link.
if ($cacheability) {
$cacheability = $cacheability
->merge(CacheableMetadata::createFromObject($element->access))
->merge(CacheableMetadata::createFromObject($element->link));
}
// Only show accessible links.
if (!$element->access->isAllowed()) {
continue;
}
$link = $element->link;
if ($link->getPluginId() != $exclude) {
$title = $indent . ' ' . Unicode::truncate($link->getTitle(), 30, TRUE, FALSE);
if (!$link->isEnabled()) {
$title .= ' (' . $this->t('disabled') . ')';
}
$options[$menu_name . ':' . $link->getPluginId()] = $title;
if (!empty($element->subtree)) {
$this->parentSelectOptionsTreeWalk($element->subtree, $menu_name, $indent . '--', $options, $exclude, $depth_limit, $cacheability);
}
}
}
}
/**
* Gets a list of menu names for use as options.
*
* @param array $menu_names
* (optional) Array of menu names to limit the options, or NULL to load all.
*
* @return array
* Keys are menu names (ids) values are the menu labels.
*/
protected function getMenuOptions(array $menu_names = NULL) {
$menus = $this->entityManager->getStorage('menu')->loadMultiple($menu_names);
$options = [];
/** @var \Drupal\system\MenuInterface[] $menus */
foreach ($menus as $menu) {
$options[$menu->id()] = $menu->label();
}
return $options;
}
}