bm-1.0.x-dev/src/Plugin/Field/FieldType/BookButtonItem.php

<?php

declare(strict_types=1);

namespace Drupal\bm\Plugin\Field\FieldType;

use Drupal\Component\Utility\Random;
use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldItemBase;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\TypedData\DataDefinition;

/**
 * Defines the 'bm_book_button' field type.
 *
 * @FieldType(
 *   id = "bm_book_button",
 *   label = @Translation("Book Button"),
 *   description = @Translation("Some description."),
 *   default_formatter = "bm_book_button_default",
 * )
 */
final class BookButtonItem extends FieldItemBase {

  /**
   * {@inheritdoc}
   */
  public static function defaultFieldSettings(): array {
    $settings = ['label' => 'book'];
    return $settings + parent::defaultFieldSettings();
  }

  /**
   * {@inheritdoc}
   */
  public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition): array {

    $properties['value_1'] = DataDefinition::create('string')
      ->setLabel(t('Value 1'));

    return $properties;
  }

  /**
   * {@inheritdoc}
   */
  public function getConstraints(): array {
    $constraints = parent::getConstraints();

    $options['value_1']['AllowedValues'] = [];

    $constraint_manager = \Drupal::typedDataManager()->getValidationConstraintManager();
    $constraints[] = $constraint_manager->create('ComplexData', $options);
    // @todo Add more constraints here.
    return $constraints;
  }

  /**
   * {@inheritdoc}
   */
  public static function schema(FieldStorageDefinitionInterface $field_definition): array {

    $columns = [
      'value_1' => [
        'type' => 'varchar',
        'length' => 255,
      ],
    ];

    $schema = [
      'columns' => $columns,
      // @DCG Add indexes here if necessary.
    ];

    return $schema;
  }

}