class LayoutForm

final class LayoutForm extends FormBase {
    use LayoutBuilderEntityFormTrait {
        buildActions as buildActionsElement;
        saveTasks as saveTasks;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getBaseFormId() : string {
        return 'navigation_layout';
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() : string {
        return 'navigation_layout';
    }
    
    /**
     * The section storage.
     *
     * @var \Drupal\layout_builder\SectionStorageInterface
     */
    protected $sectionStorage;
    
    /**
     * Constructs a new LayoutForm.
     */
    public function __construct(LayoutTempstoreRepositoryInterface $layoutTempstoreRepository) {
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('layout_builder.tempstore_repository'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state, ?SectionStorageInterface $section_storage = NULL) {
        $form['#attributes']['class'][] = 'layout-builder-form';
        $form['layout_builder'] = [
            '#type' => 'layout_builder',
            '#section_storage' => $section_storage,
        ];
        $form['#attached']['library'][] = 'navigation/navigation.layoutBuilder';
        $this->sectionStorage = $section_storage;
        $form['actions'] = [
            'submit' => [
                '#type' => 'submit',
                '#value' => $this->t('Save'),
            ],
        ] + $this->buildActionsElement([]);
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) : void {
        $this->sectionStorage
            ->save();
        $this->saveTasks($form_state, new TranslatableMarkup('Saved navigation blocks'));
    }

}