ContactFormListBuilder.php

<?php

namespace Drupal\contact;

use Drupal\Core\Config\Entity\ConfigEntityListBuilder;
use Drupal\Core\Entity\EntityInterface;

/**
 * Defines a class to build a listing of contact form entities.
 *
 * @see \Drupal\contact\Entity\ContactForm
 */
class ContactFormListBuilder extends ConfigEntityListBuilder {
    
    /**
     * {@inheritdoc}
     */
    public function buildHeader() {
        $header['form'] = t('Form');
        $header['recipients'] = t('Recipients');
        $header['selected'] = t('Selected');
        return $header + parent::buildHeader();
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildRow(EntityInterface $entity) {
        // Special case the personal form.
        if ($entity->id() == 'personal') {
            $row['form'] = $entity->label();
            $row['recipients'] = t('Selected user');
            $row['selected'] = t('No');
        }
        else {
            $row['form'] = $entity->toLink(NULL, 'canonical')
                ->toString();
            $row['recipients']['data'] = [
                '#theme' => 'item_list',
                '#items' => $entity->getRecipients(),
                '#context' => [
                    'list_style' => 'comma-list',
                ],
            ];
            $default_form = \Drupal::config('contact.settings')->get('default_form');
            $row['selected'] = $default_form == $entity->id() ? t('Yes') : t('No');
        }
        return $row + parent::buildRow($entity);
    }

}