class NavigationShortcutsBlock

final class NavigationShortcutsBlock extends BlockBase implements ContainerFactoryPluginInterface {
  
  /**
   * Constructs a new ShortcutsNavigationBlock.
   *
   * @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\Extension\ModuleHandlerInterface $moduleHandler
   *   The module handler service.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, protected ModuleHandlerInterface $moduleHandler) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static($configuration, $plugin_id, $plugin_definition, $container->get('module_handler'));
  }
  
  /**
   * {@inheritdoc}
   */
  protected function blockAccess(AccountInterface $account) : AccessResultInterface {
    return AccessResult::allowedIfHasPermission($account, 'access shortcuts');
  }
  
  /**
   * {@inheritdoc}
   */
  public function build() : array {
    // This navigation block requires shortcut module. Once the plugin is moved
    // to the module, this should not be necessary.
    if (!$this->moduleHandler
      ->moduleExists('shortcut')) {
      return [];
    }
    return [
      'shortcuts' => [
        // @phpstan-ignore-next-line
'#lazy_builder' => [
          'navigation.shortcut_lazy_builder:lazyLinks',
          [
            $this->configuration['label'],
          ],
        ],
        '#create_placeholder' => TRUE,
        '#cache' => [
          'keys' => [
            'shortcut_set_navigation_links',
          ],
          'contexts' => [
            'user',
          ],
        ],
        '#lazy_builder_preview' => [
          '#markup' => '<a href="#" class="toolbar-tray-lazy-placeholder-link">&nbsp;</a>',
        ],
      ],
    ];
  }

}