class FieldTestFieldHooks

class FieldTestFieldHooks {
    
    /**
     * Implements hook_field_widget_info_alter().
     */
    public function fieldWidgetInfoAlter(&$info) {
        $info['test_field_widget_multiple']['field_types'][] = 'test_field';
        $info['test_field_widget_multiple']['field_types'][] = 'test_field_with_preconfigured_options';
        // Add extra widget when needed for tests.
        // @see \Drupal\field\Tests\FormTest::widgetAlterTest().
        if ($alter_info = \Drupal::state()->get("field_test.widget_alter_test")) {
            if ($alter_info['widget'] === 'test_field_widget_multiple_single_value') {
                $info['test_field_widget_multiple_single_value']['field_types'][] = 'test_field';
            }
        }
    }
    
    /**
     * Implements hook_field_storage_config_update_forbid().
     */
    public function fieldStorageConfigUpdateForbid(FieldStorageConfigInterface $field_storage, FieldStorageConfigInterface $prior_field_storage) {
        if ($field_storage->getType() == 'test_field' && $field_storage->getSetting('unchangeable') != $prior_field_storage->getSetting('unchangeable')) {
            throw new FieldStorageDefinitionUpdateForbiddenException("field_test 'unchangeable' setting cannot be changed'");
        }
    }
    
    /**
     * Implements hook_entity_field_access().
     */
    public function entityFieldAccess($operation, FieldDefinitionInterface $field_definition, AccountInterface $account, ?FieldItemListInterface $items = NULL) {
        if ($field_definition->getName() == "field_no_{$operation}_access") {
            return AccessResult::forbidden();
        }
        // Only grant view access to test_view_field fields when the user has
        // 'view test_view_field content' permission.
        if ($field_definition->getName() == 'test_view_field' && $operation == 'view') {
            return AccessResult::forbiddenIf(!$account->hasPermission('view test_view_field content'))
                ->cachePerPermissions();
        }
        return AccessResult::allowed();
    }

}