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MetadataInfoEventSubscriber.php in Filebrowser 3.x

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modules/src/EventSubscriber/MetadataInfoEventSubscriber.php
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<?php

namespace Drupal\filebrowser_extra\EventSubscriber;

use Drupal\filebrowser\Events\MetadataInfo;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
class MetadataInfoEventSubscriber implements EventSubscriberInterface {
  public static function getSubscribedEvents() {
    $events['filebrowser.metadata_info'][] = [
      'setInfo',
      0,
    ];
    return $events;
  }
  public function setInfo($event) {

    /** @var MetadataInfo $event */
    $data = $event
      ->getMetaDataInfo();
    $data['modified'] = [
      'title' => t('Modified'),
      //'sortable' => TRUE,
      'type' => 'integer',
    ];
    $event
      ->setMetaDataInfo($data);
  }

}

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