address-8.x-1.x-dev/src/Plugin/Field/FieldWidget/CountryDefaultWidget.php

<?php

namespace Drupal\address\Plugin\Field\FieldWidget;

use CommerceGuys\Addressing\Country\CountryRepositoryInterface;
use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\WidgetBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Validator\ConstraintViolationInterface;

/**
 * Plugin implementation of the 'address_country_default' widget.
 *
 * @FieldWidget(
 *   id = "address_country_default",
 *   label = @Translation("Country"),
 *   field_types = {
 *     "address_country"
 *   },
 * )
 */
class CountryDefaultWidget extends WidgetBase implements ContainerFactoryPluginInterface {

  /**
   * The country repository.
   *
   * @var \CommerceGuys\Addressing\Country\CountryRepositoryInterface
   */
  protected $countryRepository;

  /**
   * Constructs a CountryDefaultWidget object.
   *
   * @param string $plugin_id
   *   The plugin_id for the widget.
   * @param mixed $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
   *   The definition of the field to which the widget is associated.
   * @param array $settings
   *   The widget settings.
   * @param array $third_party_settings
   *   Any third party settings.
   * @param \CommerceGuys\Addressing\Country\CountryRepositoryInterface $country_repository
   *   The country repository.
   */
  public function __construct($plugin_id, $plugin_definition, FieldDefinitionInterface $field_definition, array $settings, array $third_party_settings, CountryRepositoryInterface $country_repository) {
    parent::__construct($plugin_id, $plugin_definition, $field_definition, $settings, $third_party_settings);

    $this->countryRepository = $country_repository;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    // @see \Drupal\Core\Field\WidgetPluginManager::createInstance().
    return new static(
      $plugin_id,
      $plugin_definition,
      $configuration['field_definition'],
      $configuration['settings'],
      $configuration['third_party_settings'],
      $container->get('address.country_repository')
    );
  }

  /**
   * {@inheritdoc}
   */
  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
    $element['value'] = [
      '#type' => 'address_country',
      '#default_value' => $items[$delta]->value,
      '#available_countries' => $items[$delta]->getAvailableCountries(),
    ] + $element;

    return $element;
  }

  /**
   * {@inheritdoc}
   */
  public function errorElement(array $element, ConstraintViolationInterface $violation, array $form, FormStateInterface $form_state) {
    return $element['value'];
  }

}