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 $data) {
            list($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;
    }

}