getLayoutBuilderUrl example

'#submit' => ['::redirectOnSubmit'],
      '#redirect' => 'discard_changes',
    ];
    $actions['preview_toggle'] = $this->buildContentPreviewToggle();
    return $actions;
  }

  /** * Form submission handler. */
  public function redirectOnSubmit(array $form, FormStateInterface $form_state) {
    $form_state->setRedirectUrl($this->sectionStorage->getLayoutBuilderUrl($form_state->getTriggeringElement()['#redirect']));
  }

  /** * {@inheritdoc} */
  public function save(array $form, FormStateInterface $form_state) {
    $return = $this->sectionStorage->save();
    $this->layoutTempstoreRepository->delete($this->sectionStorage);
    $this->messenger()->addMessage($this->t('The layout has been saved.'));
    $form_state->setRedirectUrl($this->sectionStorage->getRedirectUrl());
    return $return;
  }

/** * {@inheritdoc} */
  public function getConfirmText() {
    return $this->t('Revert');
  }

  /** * {@inheritdoc} */
  public function getCancelUrl() {
    return $this->sectionStorage->getLayoutBuilderUrl();
  }

  /** * {@inheritdoc} */
  public function buildForm(array $form, FormStateInterface $form_state, SectionStorageInterface $section_storage = NULL) {
    if (!$section_storage instanceof OverridesSectionStorageInterface) {
      throw new \InvalidArgumentException(sprintf('The section storage with type "%s" and ID "%s" does not provide overrides', $section_storage->getStorageType(), $section_storage->getStorageId()));
    }

    $this->sectionStorage = $section_storage;
    

    $configuration = $this->layout->getConfiguration();

    $section = $this->getCurrentSection();
    $section->setLayoutSettings($configuration);
    if (!$this->isUpdate) {
      $this->sectionStorage->insertSection($this->delta, $section);
    }

    $this->layoutTempstoreRepository->set($this->sectionStorage);
    $form_state->setRedirectUrl($this->sectionStorage->getLayoutBuilderUrl());
  }

  /** * {@inheritdoc} */
  protected function successfulAjaxSubmit(array $form, FormStateInterface $form_state) {
    return $this->rebuildAndClose($this->sectionStorage);
  }

  /** * Retrieves the plugin form for a given layout. * * @param \Drupal\Core\Layout\LayoutInterface $layout * The layout plugin. * * @return \Drupal\Core\Plugin\PluginFormInterface * The plugin form for the layout. * * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException */

/** * {@inheritdoc} */
  public function getLayoutBuilderUrl($rel = 'view') {
    return Url::fromRoute("layout_builder.{$this->getStorageType()}.$rel", ['id' => $this->getStorageId()]);
  }

  /** * {@inheritdoc} */
  public function getRedirectUrl() {
    return $this->getLayoutBuilderUrl();
  }

  /** * {@inheritdoc} */
  public function access($operation, AccountInterface $account = NULL, $return_as_object = FALSE) {
    $result = AccessResult::allowed();
    return $return_as_object ? $result : $result->isAllowed();
  }

  /** * {@inheritdoc} */

  public function build(SectionStorageInterface $section_storage, int $delta, $plugin_id) {
    $section_storage->insertSection($delta, new Section($plugin_id));

    $this->layoutTempstoreRepository->set($section_storage);

    if ($this->isAjax()) {
      return $this->rebuildAndClose($section_storage);
    }
    else {
      $url = $section_storage->getLayoutBuilderUrl();
      return new RedirectResponse($url->setAbsolute()->toString());
    }
  }

}

  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('layout_builder.tempstore_repository')
    );
  }

  /** * {@inheritdoc} */
  public function getCancelUrl() {
    return $this->sectionStorage->getLayoutBuilderUrl();
  }

  /** * {@inheritdoc} */
  public function buildForm(array $form, FormStateInterface $form_state, SectionStorageInterface $section_storage = NULL, $delta = NULL) {
    $this->sectionStorage = $section_storage;
    $this->delta = $delta;

    $form = parent::buildForm($form, $form_state);

    

// If this block is context-aware, set the context mapping.     if ($this->block instanceof ContextAwarePluginInterface) {
      $this->block->setContextMapping($subform_state->getValue('context_mapping', []));
    }

    $configuration = $this->block->getConfiguration();

    $section = $this->sectionStorage->getSection($this->delta);
    $section->getComponent($this->uuid)->setConfiguration($configuration);

    $this->layoutTempstoreRepository->set($this->sectionStorage);
    $form_state->setRedirectUrl($this->sectionStorage->getLayoutBuilderUrl());
  }

  /** * {@inheritdoc} */
  protected function successfulAjaxSubmit(array $form, FormStateInterface $form_state) {
    return $this->rebuildAndClose($this->sectionStorage);
  }

  /** * Retrieves the plugin form for a given block. * * @param \Drupal\Core\Block\BlockPluginInterface $block * The block plugin. * * @return \Drupal\Core\Plugin\PluginFormInterface * The plugin form for the block. */

$entity_type = $entity->getEntityType();
    $bundle_info = $this->entityTypeBundleInfo->getBundleInfo($entity->getEntityTypeId());

    $variables = [
      '@bundle' => $bundle_info[$entity->bundle()]['label'],
      '@singular_label' => $entity_type->getSingularLabel(),
      '@plural_label' => $entity_type->getPluralLabel(),
    ];

    $defaults_link = $section_storage
      ->getDefaultSectionStorage()
      ->getLayoutBuilderUrl();

    if ($defaults_link->access($this->currentUser())) {
      $variables[':link'] = $defaults_link->toString();
      if ($entity_type->hasKey('bundle')) {
        $message = $this->t('You are editing the layout for this @bundle @singular_label. <a href=":link">Edit the template for all @bundle @plural_label instead.</a>', $variables);
      }
      else {
        $message = $this->t('You are editing the layout for this @singular_label. <a href=":link">Edit the template for all @plural_label instead.</a>', $variables);
      }
    }
    else {
      

// Hide the table of fields.       $form['fields']['#access'] = FALSE;
      $form['#fields'] = [];
      $form['#extra'] = [];
    }

    $form['manage_layout'] = [
      '#type' => 'link',
      '#title' => $this->t('Manage layout'),
      '#weight' => -10,
      '#attributes' => ['class' => ['button']],
      '#url' => $this->sectionStorage->getLayoutBuilderUrl(),
      '#access' => $is_enabled,
    ];

    $form['layout'] = [
      '#type' => 'details',
      '#open' => TRUE,
      '#title' => $this->t('Layout options'),
      '#tree' => TRUE,
    ];

    $form['layout']['enabled'] = [