ViewsMenuLink.php

<?php

namespace Drupal\views\Plugin\Derivative;

use Drupal\Component\Plugin\Derivative\DeriverBase;
use Drupal\Core\Plugin\Discovery\ContainerDeriverInterface;
use Drupal\views\Plugin\views\display\DisplayMenuInterface;
use Drupal\views\Views;
use Drupal\Core\Entity\EntityStorageInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides menu links for Views.
 *
 * @see \Drupal\views\Plugin\Menu\ViewsMenuLink
 */
class ViewsMenuLink extends DeriverBase implements ContainerDeriverInterface {
  
  /**
   * The view storage.
   *
   * @var \Drupal\Core\Entity\EntityStorageInterface
   */
  protected $viewStorage;
  
  /**
   * Constructs a \Drupal\views\Plugin\Derivative\ViewsLocalTask instance.
   *
   * @param \Drupal\Core\Entity\EntityStorageInterface $view_storage
   *   The view storage.
   */
  public function __construct(EntityStorageInterface $view_storage) {
    $this->viewStorage = $view_storage;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, $base_plugin_id) {
    return new static($container->get('entity_type.manager')
      ->getStorage('view'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function getDerivativeDefinitions($base_plugin_definition) {
    $links = [];
    $views = Views::getApplicableViews('uses_menu_links');
    foreach ($views as $data) {
      [
        $view_id,
        $display_id,
      ] = $data;
      /** @var \Drupal\views\ViewExecutable $executable */
      $executable = $this->viewStorage
        ->load($view_id)
        ->getExecutable();
      $executable->initDisplay();
      $display = $executable->displayHandlers
        ->get($display_id);
      if ($display instanceof DisplayMenuInterface && ($result = $display->getMenuLinks())) {
        foreach ($result as $link_id => $link) {
          $links[$link_id] = $link + $base_plugin_definition;
        }
      }
    }
    return $links;
  }

}