MoveBlockController.php

<?php

namespace Drupal\layout_builder\Controller;

use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\layout_builder\LayoutTempstoreRepositoryInterface;
use Drupal\layout_builder\SectionStorageInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Defines a controller to move a block.
 *
 * @internal
 *   Controller classes are internal.
 */
class MoveBlockController implements ContainerInjectionInterface {
    use LayoutRebuildTrait;
    
    /**
     * The layout tempstore repository.
     *
     * @var \Drupal\layout_builder\LayoutTempstoreRepositoryInterface
     */
    protected $layoutTempstoreRepository;
    
    /**
     * LayoutController constructor.
     *
     * @param \Drupal\layout_builder\LayoutTempstoreRepositoryInterface $layout_tempstore_repository
     *   The layout tempstore repository.
     */
    public function __construct(LayoutTempstoreRepositoryInterface $layout_tempstore_repository) {
        $this->layoutTempstoreRepository = $layout_tempstore_repository;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('layout_builder.tempstore_repository'));
    }
    
    /**
     * Moves a block to another region.
     *
     * @param \Drupal\layout_builder\SectionStorageInterface $section_storage
     *   The section storage.
     * @param int $delta_from
     *   The delta of the original section.
     * @param int $delta_to
     *   The delta of the destination section.
     * @param string $region_to
     *   The new region for this block.
     * @param string $block_uuid
     *   The UUID for this block.
     * @param string|null $preceding_block_uuid
     *   (optional) If provided, the UUID of the block to insert this block after.
     *
     * @return \Drupal\Core\Ajax\AjaxResponse
     *   An AJAX response.
     */
    public function build(SectionStorageInterface $section_storage, int $delta_from, int $delta_to, $region_to, $block_uuid, $preceding_block_uuid = NULL) {
        $section = $section_storage->getSection($delta_from);
        $component = $section->getComponent($block_uuid);
        $section->removeComponent($block_uuid);
        // If the block is moving from one section to another, update the original
        // section and load the new one.
        if ($delta_from !== $delta_to) {
            $section = $section_storage->getSection($delta_to);
        }
        // If a preceding block was specified, insert after that. Otherwise add the
        // block to the front.
        $component->setRegion($region_to);
        if (isset($preceding_block_uuid)) {
            $section->insertAfterComponent($preceding_block_uuid, $component);
        }
        else {
            $section->insertComponent(0, $component);
        }
        $this->layoutTempstoreRepository
            ->set($section_storage);
        return $this->rebuildLayout($section_storage);
    }

}