LayoutBuilderConfigSubscriber.php

<?php

declare (strict_types=1);
namespace Drupal\layout_builder\EventSubscriber;

use Drupal\Core\Block\BlockManagerInterface;
use Drupal\Core\Config\ConfigCrudEvent;
use Drupal\Core\Config\ConfigEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Layout Builder Config subscriber.
 */
final class LayoutBuilderConfigSubscriber implements EventSubscriberInterface {
    
    /**
     * Constructs a LayoutBuilderConfigSubscriber.
     */
    public function __construct(BlockManagerInterface $blockManager) {
    }
    
    /**
     * Clears the block plugin cache when expose_all_field_blocks changes.
     *
     * @param \Drupal\Core\Config\ConfigCrudEvent $event
     *   The configuration event.
     */
    public function onConfigSave(ConfigCrudEvent $event) : void {
        $saved_config = $event->getConfig();
        if ($saved_config->getName() == 'layout_builder.settings' && $event->isChanged('expose_all_field_blocks')) {
            $this->blockManager
                ->clearCachedDefinitions();
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public static function getSubscribedEvents() : array {
        $events[ConfigEvents::SAVE][] = [
            'onConfigSave',
        ];
        return $events;
    }

}