menu_link_content.module

<?php


/**
 * @file
 * Allows administrators to create custom menu links.
 */
use Drupal\Core\Url;
use Drupal\Core\Entity\EntityInterface;
use Drupal\path_alias\PathAliasInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\system\MenuInterface;

/**
 * Implements hook_help().
 */
function menu_link_content_help($route_name, RouteMatchInterface $route_match) {
    switch ($route_name) {
        case 'help.page.menu_link_content':
            $output = '';
            $output .= '<h3>' . t('About') . '</h3>';
            $output .= '<p>' . t('The Custom Menu Links module allows users to create menu links. These links can be translated if multiple languages are used for the site.');
            if (\Drupal::moduleHandler()->moduleExists('menu_ui')) {
                $output .= ' ' . t('It is required by the Menu UI module, which provides an interface for managing menus and menu links. For more information, see the <a href=":menu-help">Menu UI module help page</a> and the <a href=":drupal-org-help">online documentation for the Custom Menu Links module</a>.', [
                    ':menu-help' => Url::fromRoute('help.page', [
                        'name' => 'menu_ui',
                    ])->toString(),
                    ':drupal-org-help' => 'https://www.drupal.org/documentation/modules/menu_link',
                ]);
            }
            else {
                $output .= ' ' . t('For more information, see the <a href=":drupal-org-help">online documentation for the Custom Menu Links module</a>. If you enable the Menu UI module, it provides an interface for managing menus and menu links.', [
                    ':drupal-org-help' => 'https://www.drupal.org/documentation/modules/menu_link',
                ]);
            }
            $output .= '</p>';
            return $output;
    }
}

/**
 * Implements hook_entity_type_alter().
 */
function menu_link_content_entity_type_alter(array &$entity_types) {
    // @todo Moderation is disabled for custom menu links until when we have an UI
    //   for them.
    //   @see https://www.drupal.org/project/drupal/issues/2350939
    $entity_types['menu_link_content']->setHandlerClass('moderation', '');
}

/**
 * Implements hook_menu_delete().
 */
function menu_link_content_menu_delete(MenuInterface $menu) {
    $storage = \Drupal::entityTypeManager()->getStorage('menu_link_content');
    $menu_links = $storage->loadByProperties([
        'menu_name' => $menu->id(),
    ]);
    $storage->delete($menu_links);
}

/**
 * Implements hook_ENTITY_TYPE_insert() for 'path_alias'.
 */
function menu_link_content_path_alias_insert(PathAliasInterface $path_alias) {
    _menu_link_content_update_path_alias($path_alias->getAlias());
}

/**
 * Helper function to update plugin definition using internal scheme.
 *
 * @param string $path
 *   The path alias.
 */
function _menu_link_content_update_path_alias($path) {
    
    /** @var \Drupal\Core\Menu\MenuLinkManagerInterface $menu_link_manager */
    $menu_link_manager = \Drupal::service('plugin.manager.menu.link');
    
    /** @var \Drupal\menu_link_content\MenuLinkContentInterface[] $entities */
    $entities = \Drupal::entityTypeManager()->getStorage('menu_link_content')
        ->loadByProperties([
        'link.uri' => 'internal:' . $path,
    ]);
    foreach ($entities as $menu_link) {
        $menu_link_manager->updateDefinition($menu_link->getPluginId(), $menu_link->getPluginDefinition(), FALSE);
    }
}

/**
 * Implements hook_ENTITY_TYPE_update() for 'path_alias'.
 */
function menu_link_content_path_alias_update(PathAliasInterface $path_alias) {
    if ($path_alias->getAlias() != $path_alias->original
        ->getAlias()) {
        _menu_link_content_update_path_alias($path_alias->getAlias());
        _menu_link_content_update_path_alias($path_alias->original
            ->getAlias());
    }
    elseif ($path_alias->getPath() != $path_alias->original
        ->getPath()) {
        _menu_link_content_update_path_alias($path_alias->getAlias());
    }
}

/**
 * Implements hook_ENTITY_TYPE_delete() for 'path_alias'.
 */
function menu_link_content_path_alias_delete(PathAliasInterface $path_alias) {
    _menu_link_content_update_path_alias($path_alias->getAlias());
}

/**
 * Implements hook_entity_predelete().
 */
function menu_link_content_entity_predelete(EntityInterface $entity) {
    
    /** @var \Drupal\Core\Menu\MenuLinkManagerInterface $menu_link_manager */
    $menu_link_manager = \Drupal::service('plugin.manager.menu.link');
    $entity_type_id = $entity->getEntityTypeId();
    foreach ($entity->uriRelationships() as $rel) {
        $url = $entity->toUrl($rel);
        // Entities can provide uri relationships that are not routed, in this case
        // getRouteParameters() will throw an exception.
        if (!$url->isRouted()) {
            continue;
        }
        $route_parameters = $url->getRouteParameters();
        if (!isset($route_parameters[$entity_type_id])) {
            // Do not delete links which do not relate to this exact entity. For
            // example, "collection", "add-form", etc.
            continue;
        }
        // Delete all MenuLinkContent links that point to this entity route.
        $result = $menu_link_manager->loadLinksByRoute($url->getRouteName(), $route_parameters);
        if ($result) {
            foreach ($result as $id => $instance) {
                if ($instance->isDeletable() && strpos($id, 'menu_link_content:') === 0) {
                    $instance->deleteLink();
                }
            }
        }
    }
}