layout_builder_ipe-1.0.x-dev/src/LayoutBuilder/LayoutBuilderUi.php

<?php

namespace Drupal\layout_builder_ipe\LayoutBuilder;

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Markup;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\Core\Url;
use Drupal\layout_builder\Context\LayoutBuilderContextTrait;
use Drupal\layout_builder\Controller\LayoutRebuildTrait;
use Drupal\layout_builder\LayoutTempstoreRepositoryInterface;
use Drupal\layout_builder\SectionComponent;
use Drupal\layout_builder\SectionStorageInterface;
use Symfony\Component\HttpFoundation\RequestStack;

/**
 * Service class for helping with altering the behavior of the LB UI.
 */
class LayoutBuilderUi {

  use StringTranslationTrait;
  use LayoutBuilderContextTrait;
  use LayoutRebuildTrait;

  const BEFORE = 'before';
  const AFTER = 'after';

  /**
   * The current request.
   *
   * @var \Symfony\Component\HttpFoundation\Request
   */
  protected $request;

  /**
   * The layout tempstore repository.
   *
   * @var \Drupal\layout_builder\LayoutTempstoreRepositoryInterface
   */
  protected $layoutTempstoreRepository;

  /**
   * Public constructor.
   *
   * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
   *   The request stack.
   * @param \Drupal\layout_builder\LayoutTempstoreRepositoryInterface $layout_tempstore_repository
   *   The layout tempstore repository.
   */
  public function __construct(RequestStack $request_stack, LayoutTempstoreRepositoryInterface $layout_tempstore_repository) {
    $this->request = $request_stack->getCurrentRequest();
    $this->layoutTempstoreRepository = $layout_tempstore_repository;
  }

  /**
   * Create an additional "Add block" button.
   *
   * @param \Drupal\layout_builder\SectionComponent $component
   *   The section component holding a block.
   * @param \Drupal\layout_builder\SectionStorageInterface $section_storage
   *   The section storage.
   * @param int $delta
   *   The delta of the section.
   * @param string $placement
   *   One of self::BEFORE or self::AFTER to control where the link should be
   *   added respective to the given component.
   *
   * @return array
   *   A render array describing the button.
   */
  public function createAddButton(SectionComponent $component, SectionStorageInterface $section_storage, $delta, $placement) {
    $storage_type = $section_storage->getStorageType();
    $storage_id = $section_storage->getStorageId();
    $section = $section_storage->getSection($delta);

    $layout = $section->getLayout($this->getPopulatedContexts($section_storage));
    $layout_settings = $section->getLayoutSettings();
    $section_label = !empty($layout_settings['label']) ? $layout_settings['label'] : $this->t('Section @section', ['@section' => $delta + 1]);

    $layout_definition = $layout->getPluginDefinition();
    $region_labels = $layout_definition->getRegionLabels();
    $region = $component->getRegion();

    $classes = [
      'use-ajax',
      'layout-builder__link',
      'layout-builder__link--add',
    ];
    $position = NULL;
    if ($placement == self::BEFORE) {
      $classes[] = 'link-before';
      $position = $component->getWeight();
    }
    if ($placement == self::AFTER) {
      $classes[] = 'link-after';
      $position = $component->getWeight() + 1;
    }

    $icon = Markup::create(file_get_contents('core/misc/icons/bebebe/plus.svg'));
    $add_link = [
      '#type' => 'link',
      '#title' => $this->t('@icon<span class="visually-hidden">in @section, @region region</span>', [
        '@icon' => $icon,
        '@section' => $section_label,
        '@region' => $region_labels[$region],
      ]),
      '#url' => Url::fromRoute('layout_builder.choose_block',
        [
          'section_storage_type' => $storage_type,
          'section_storage' => $storage_id,
          'delta' => $delta,
          'region' => $region,
        ],
        [
          'query' => [
            'position' => $position,
          ],
          'attributes' => [
            'class' => $classes,
            'data-dialog-type' => 'dialog',
            'data-dialog-renderer' => 'off_canvas',
          ],
        ],
      ),
    ];

    return $add_link;
  }

  /**
   * Handle a form submit of block forms.
   *
   * This method takes care to only do something, if the form submission is the
   * result of a form triggered by a button click on buttons created via
   * self::createAddButton().
   * The logic for positioning the element comes from
   * \Drupal\layout_builder\Controller\MoveBlockController::build().
   *
   * @param array $form
   *   The form element.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The form state interface.
   */
  public function blockFormSubmit(array &$form, FormStateInterface $form_state) {
    $position = $this->request->query->get('position');
    if ($position === NULL || $position === '') {
      return;
    }
    /** @var \Drupal\layout_builder\Form\AddBlockForm $form_object */
    $form_object = $form_state->getFormObject();
    $current_section = $form_object->getCurrentSection();

    // Get the new component and remove it from the current section, so that it
    // can be re-added at the specified position.
    $new_component = $form_object->getCurrentComponent();
    $current_section->removeComponent($new_component->getUuid());

    // Find the preceding block, based on the specified position, so that we
    // know after which element the component must be added.
    $preceding_block_uuid = NULL;
    foreach ($current_section->getComponents() as $component) {
      if ($component->getWeight() == $position - 1) {
        $preceding_block_uuid = $component->getUuid();
        break;
      }
    }

    // Now either insert the component after the preceding block, or put it
    // first if there is no preceding block. This will internally also adjust
    // the weight of all other components, so that the result is stable.
    if (isset($preceding_block_uuid)) {
      $current_section->insertAfterComponent($preceding_block_uuid, $new_component);
    }
    else {
      $current_section->insertComponent(0, $new_component);
    }

    // Now update the section storage in the tempstore.
    $section_storage = $form_object->getSectionStorage();
    $this->layoutTempstoreRepository->set($section_storage);

  }

}