class ShortcutLazyBuilders

class ShortcutLazyBuilders implements TrustedCallbackInterface {
    
    /**
     * The renderer service.
     *
     * @var \Drupal\Core\Render\RendererInterface
     */
    protected $renderer;
    
    /**
     * Constructs a new ShortcutLazyBuilders object.
     *
     * @param \Drupal\Core\Render\RendererInterface $renderer
     *   The renderer service.
     */
    public function __construct(RendererInterface $renderer) {
        $this->renderer = $renderer;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function trustedCallbacks() {
        return [
            'lazyLinks',
        ];
    }
    
    /**
     * #lazy_builder callback; builds shortcut toolbar links.
     *
     * @return array
     *   A renderable array of shortcut links.
     */
    public function lazyLinks() {
        $shortcut_set = shortcut_current_displayed_set();
        $links = shortcut_renderable_links();
        $configure_link = NULL;
        if (shortcut_set_edit_access($shortcut_set)->isAllowed()) {
            $configure_link = [
                '#type' => 'link',
                '#title' => t('Edit shortcuts'),
                '#url' => Url::fromRoute('entity.shortcut_set.customize_form', [
                    'shortcut_set' => $shortcut_set->id(),
                ]),
                '#options' => [
                    'attributes' => [
                        'class' => [
                            'edit-shortcuts',
                        ],
                    ],
                ],
            ];
        }
        $build = [
            'shortcuts' => $links,
            'configure' => $configure_link,
        ];
        $this->renderer
            ->addCacheableDependency($build, $shortcut_set);
        return $build;
    }

}