EditorConfigTranslationSubscriber.php

<?php

namespace Drupal\editor\EventSubscriber;

use Drupal\config_translation\ConfigEntityMapperInterface;
use Drupal\config_translation\Event\ConfigMapperPopulateEvent;
use Drupal\config_translation\Event\ConfigTranslationEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Drupal\Core\Config\ConfigFactoryInterface;

/**
 * Adds configuration names to configuration mapper on POPULATE_MAPPER event.
 */
class EditorConfigTranslationSubscriber implements EventSubscriberInterface {
    
    /**
     * The config factory.
     *
     * @var \Drupal\Core\Config\ConfigFactoryInterface
     */
    protected $configFactory;
    
    /**
     * EditorConfigTranslationSubscriber constructor.
     *
     * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
     *   The factory for configuration objects.
     */
    public function __construct(ConfigFactoryInterface $config_factory) {
        $this->configFactory = $config_factory;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function getSubscribedEvents() : array {
        $events = [];
        if (class_exists('Drupal\\config_translation\\Event\\ConfigTranslationEvents')) {
            $events[ConfigTranslationEvents::POPULATE_MAPPER][] = [
                'addConfigNames',
            ];
        }
        return $events;
    }
    
    /**
     * Reacts to the populating of a configuration mapper.
     *
     * @param \Drupal\config_translation\Event\ConfigMapperPopulateEvent $event
     *   The configuration mapper event.
     */
    public function addConfigNames(ConfigMapperPopulateEvent $event) {
        $mapper = $event->getMapper();
        if ($mapper instanceof ConfigEntityMapperInterface && $mapper->getType() == 'filter_format') {
            $editor_config_name = 'editor.editor.' . $mapper->getEntity()
                ->id();
            // Only add the text editor config if it exists, otherwise we assume no
            // editor has been set for this text format.
            if (!$this->configFactory
                ->get($editor_config_name)
                ->isNew()) {
                $mapper->addConfigName($editor_config_name);
            }
        }
    }

}