class ViewsMenuLink

class ViewsMenuLink extends MenuLinkBase implements ContainerFactoryPluginInterface {
    
    /**
     * {@inheritdoc}
     */
    protected $overrideAllowed = [
        'menu_name' => 1,
        'parent' => 1,
        'weight' => 1,
        'expanded' => 1,
        'enabled' => 1,
        'title' => 1,
        'description' => 1,
    ];
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * The view executable factory.
     *
     * @var \Drupal\views\ViewExecutableFactory
     */
    protected $viewExecutableFactory;
    
    /**
     * The view executable of the menu link.
     *
     * @var \Drupal\views\ViewExecutable
     */
    protected $view;
    
    /**
     * Constructs a new ViewsMenuLink.
     *
     * @param array $configuration
     *   A configuration array containing information about the plugin instance.
     * @param string $plugin_id
     *   The plugin ID for the plugin instance.
     * @param mixed $plugin_definition
     *   The plugin implementation definition.
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     * @param \Drupal\views\ViewExecutableFactory $view_executable_factory
     *   The view executable factory
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityTypeManagerInterface $entity_type_manager, ViewExecutableFactory $view_executable_factory) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        $this->entityTypeManager = $entity_type_manager;
        $this->viewExecutableFactory = $view_executable_factory;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('entity_type.manager'), $container->get('views.executable'));
    }
    
    /**
     * Initializes the proper view.
     *
     * @return \Drupal\views\ViewExecutable
     *   The view executable.
     */
    public function loadView() {
        if (empty($this->view)) {
            $metadata = $this->getMetaData();
            $view_id = $metadata['view_id'];
            $display_id = $metadata['display_id'];
            $view_entity = $this->entityTypeManager
                ->getStorage('view')
                ->load($view_id);
            $view = $this->viewExecutableFactory
                ->get($view_entity);
            $view->setDisplay($display_id);
            $view->initDisplay();
            $this->view = $view;
        }
        return $this->view;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getTitle() {
        // @todo Get the translated value from the config without instantiating the
        //   view. https://www.drupal.org/node/2310379
        return $this->loadView()->display_handler
            ->getOption('menu')['title'];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDescription() {
        return $this->loadView()->display_handler
            ->getOption('menu')['description'];
    }
    
    /**
     * {@inheritdoc}
     */
    public function isExpanded() {
        return (bool) $this->loadView()->display_handler
            ->getOption('menu')['expanded'];
    }
    
    /**
     * {@inheritdoc}
     */
    public function updateLink(array $new_definition_values, $persist) {
        $overrides = array_intersect_key($new_definition_values, $this->overrideAllowed);
        // Update the definition.
        $this->pluginDefinition = $overrides + $this->pluginDefinition;
        if ($persist) {
            $view = $this->loadView();
            $display =& $view->storage
                ->getDisplay($view->current_display);
            // Just save the title to the original view.
            $changed = FALSE;
            foreach ($overrides as $key => $new_definition_value) {
                if (empty($display['display_options']['menu'][$key]) || $display['display_options']['menu'][$key] != $new_definition_value) {
                    $display['display_options']['menu'][$key] = $new_definition_value;
                    $changed = TRUE;
                }
            }
            if ($changed) {
                // @todo Improve this to not trigger a full rebuild of everything, if we
                //   just changed some properties. https://www.drupal.org/node/2310389
                $view->storage
                    ->save();
            }
        }
        return $this->pluginDefinition;
    }
    
    /**
     * {@inheritdoc}
     */
    public function isDeletable() {
        return TRUE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function deleteLink() {
    }

}