MediaTypeListBuilder.php

<?php

namespace Drupal\media;

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

/**
 * Provides a listing of media types.
 */
class MediaTypeListBuilder extends ConfigEntityListBuilder {
  
  /**
   * {@inheritdoc}
   */
  public function buildHeader() {
    $header['title'] = $this->t('Name');
    $header['description'] = [
      'data' => $this->t('Description'),
      'class' => [
        RESPONSIVE_PRIORITY_MEDIUM,
      ],
    ];
    return $header + parent::buildHeader();
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildRow(EntityInterface $entity) {
    $row['title'] = [
      'data' => $entity->label(),
      'class' => [
        'menu-label',
      ],
    ];
    $row['description']['data'] = [
      '#markup' => $entity->getDescription(),
    ];
    return $row + parent::buildRow($entity);
  }
  
  /**
   * {@inheritdoc}
   */
  public function render() {
    $build = parent::render();
    $build['table']['#empty'] = $this->t('No media types available. <a href=":url">Add media type</a>.', [
      ':url' => Url::fromRoute('entity.media_type.add_form')->toString(),
    ]);
    return $build;
  }

}