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<?php
/**
 * @file
 * Contains \Drupal\contact\MessageViewBuilder.
 */
namespace Drupal\contact;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\EntityViewBuilder;
use Drupal\Core\Mail\MailFormatHelper;
use Drupal\Core\Render\Element;
/**
 * Render controller for contact messages.
 */
class MessageViewBuilder extends EntityViewBuilder {
  /**
   * {@inheritdoc}
   */
  protected function getBuildDefaults(EntityInterface $entity, $view_mode) {
    $build = parent::getBuildDefaults($entity, $view_mode);
    // The message fields are individually rendered into email templates, so
    // the entity has no template itself.
    unset($build['#theme']);
    return $build;
  }
  /**
   * {@inheritdoc}
   */
  public function buildComponents(array &$build, array $entities, array $displays, $view_mode) {
    parent::buildComponents($build, $entities, $displays, $view_mode);
    foreach ($entities as $id => $entity) {
      // Add the message extra field, if enabled.
      $display = $displays[$entity->bundle()];
      if ($entity->getMessage() && $display->getComponent('message')) {
        $build[$id]['message'] = array(
          '#type' => 'item',
          '#title' => t('Message'),
          '#plain_text' => $entity->getMessage(),
        );
      }
    }
  }
  /**
   * {@inheritdoc}
   */
  public function view(EntityInterface $entity, $view_mode = 'full', $langcode = NULL) {
    $build = parent::view($entity, $view_mode, $langcode);
    if ($view_mode == 'mail') {
      // Convert field labels into headings.
      // @todo Improve \Drupal\Core\Mail\MailFormatHelper::htmlToText() to
      // convert DIVs correctly.
      foreach (Element::children($build) as $key) {
        if (isset($build[$key]['#label_display']) && $build[$key]['#label_display'] == 'above') {
          $build[$key] += array('#prefix' => '');
          $build[$key]['#prefix'] = $build[$key]['#title'] . ":\n";
          $build[$key]['#label_display'] = 'hidden';
        }
      }
      $build['#post_render'][] = function ($html, array $elements) {
        return MailFormatHelper::htmlToText($html);
      };
    }
    return $build;
  }
}