og-8.x-1.x-dev/src/Plugin/Field/FieldWidget/OgAutocomplete.php

<?php

declare(strict_types=1);

namespace Drupal\og\Plugin\Field\FieldWidget;

use Drupal\Core\Field\Attribute\FieldWidget;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\Plugin\Field\FieldWidget\EntityReferenceAutocompleteWidget;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Symfony\Component\Validator\ConstraintViolationInterface;

/**
 * Plugin implementation of the 'og_autocomplete' widget.
 */
#[FieldWidget(
  id: 'og_autocomplete',
  label: new TranslatableMarkup('OG context autocomplete'),
  description: new TranslatableMarkup('An autocomplete widget that takes OG group context into account'),
  field_types: [
    'entity_reference',
  ],
)]
class OgAutocomplete extends EntityReferenceAutocompleteWidget {

  /**
   * {@inheritdoc}
   */
  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
    $element = parent::formElement($items, $delta, $element, $form, $form_state);

    $entity = $items->getEntity();
    if (!is_callable([$entity, 'getGroup'])) {
      return $element;
    }

    $element['target_id']['#type'] = 'og_autocomplete';
    $element['target_id']['#og_group'] = $entity->getGroup();

    return $element;
  }

  /**
   * {@inheritdoc}
   */
  public function errorElement(array $element, ConstraintViolationInterface $error, array $form, FormStateInterface $form_state) {
    return $element;
  }

}