ContactListBuilder.php

<?php

namespace Drupal\content_entity_example\Entity\Controller;

use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\Entity\EntityListBuilder;
use Drupal\Core\Entity\EntityStorageInterface;
use Drupal\Core\Routing\UrlGeneratorInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a list controller for content_entity_example entity.
 *
 * @ingroup content_entity_example
 */
class ContactListBuilder extends EntityListBuilder {
  
  /**
   * The url generator.
   *
   * @var \Drupal\Core\Routing\UrlGeneratorInterface
   */
  protected $urlGenerator;
  
  /**
   * {@inheritdoc}
   */
  public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
    return new static($entity_type, $container->get('entity_type.manager')
      ->getStorage($entity_type->id()), $container->get('url_generator'));
  }
  
  /**
   * Constructs a new ContactListBuilder object.
   *
   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
   *   The entity type definition.
   * @param \Drupal\Core\Entity\EntityStorageInterface $storage
   *   The entity storage class.
   * @param \Drupal\Core\Routing\UrlGeneratorInterface $url_generator
   *   The url generator.
   */
  public function __construct(EntityTypeInterface $entity_type, EntityStorageInterface $storage, UrlGeneratorInterface $url_generator) {
    parent::__construct($entity_type, $storage);
    $this->urlGenerator = $url_generator;
  }
  
  /**
   * {@inheritdoc}
   *
   * We override ::render() so that we can add our own content above the table.
   * parent::render() is where EntityListBuilder creates the table using our
   * buildHeader() and buildRow() implementations.
   */
  public function render() {
    $build['description'] = [
      '#markup' => $this->t('Content Entity Example implements a Contacts model. These contacts are fieldable entities. You can manage the fields on the <a href=":admin_link">Contacts admin page</a>.', [
        ':admin_link' => $this->urlGenerator
          ->generateFromRoute('content_entity_example.contact_settings'),
      ]),
    ];
    $build['table'] = parent::render();
    return $build;
  }
  
  /**
   * {@inheritdoc}
   *
   * Building the header and content lines for the contact list.
   *
   * Calling the parent::buildHeader() adds a column for the possible actions
   * and inserts the 'edit' and 'delete' links as defined for the entity type.
   */
  public function buildHeader() {
    $header['id'] = $this->t('ContactID');
    $header['name'] = $this->t('Name');
    $header['first_name'] = $this->t('First Name');
    $header['role'] = $this->t('Role');
    return $header + parent::buildHeader();
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildRow(EntityInterface $entity) {
    /** @var \Drupal\content_entity_example\Entity\Contact $entity */
    $row['id'] = $entity->id();
    $row['name'] = $entity->toLink()
      ->toString();
    $row['first_name'] = $entity->first_name->value;
    $row['role'] = $entity->role->value;
    return $row + parent::buildRow($entity);
  }

}