LayoutBuilderOverrideHook.php

<?php

declare (strict_types=1);
namespace Drupal\layout_builder_override\Hook;

use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\Hook\Attribute\Hook;
use Drupal\layout_builder_override\Entity\EntityViewDisplay;
use Drupal\layout_builder_override\LayoutBuilderEntityViewDisplay;

/**
 * Hook implementations for layout_builder_override.
 */
class LayoutBuilderOverrideHook {
  public function __construct(protected ModuleHandlerInterface $moduleHandler) {
  }
  
  /**
   * Implements hook_entity_type_alter().
   */
  public function entityTypeAlter(array &$entity_types) : void {
    /** @var \Drupal\Core\Entity\EntityTypeInterface[] $entity_types */
    if ($this->moduleHandler
      ->moduleExists('layout_builder')) {
      $entity_types['entity_view_display']->setClass(LayoutBuilderEntityViewDisplay::class);
    }
    else {
      $entity_types['entity_view_display']->setClass(EntityViewDisplay::class);
    }
  }

}