improvements-2.x-dev/modules/improvements_views/src/Plugin/Field/FieldType/ViewsItem.php

<?php

namespace Drupal\improvements_views\Plugin\Field\FieldType;

use Drupal\Core\Field\Attribute\FieldType;
use Drupal\Core\Field\FieldItemBase;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\TypedData\DataDefinition;

#[FieldType(
  id: 'views',
  label: new TranslatableMarkup('Views'),
  description: new TranslatableMarkup('Field for storing data about Views (View id and display name).'),
  default_widget: 'views_widget',
  default_formatter: 'views_formatter',
)]
class ViewsItem extends FieldItemBase {

  /**
   * {@inheritDoc}
   */
  public static function schema(FieldStorageDefinitionInterface $field_definition): array {
    return [
      'columns' => [
        'value' => [
          'type' => 'varchar',
          'length' => 255,
          'description' => 'View id and display name',
        ],
      ],
    ];
  }

  /**
   * {@inheritDoc}
   */
  public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition): array {
    $properties['value'] = DataDefinition::create('string')
      ->setLabel(new TranslatableMarkup('View id and display name'))
      ->setRequired(TRUE);

    return $properties;
  }

}