content_translation_field_sync_widget

content_translation_field_sync_widget(FieldDefinitionInterface $field, $element_name = 'third_party_settings[content_translation][translation_sync]')

function content_translation_field_sync_widget(FieldDefinitionInterface $field, $element_name = 'third_party_settings[content_translation][translation_sync]') {
  // No way to store field sync information on this field.
  if (!($field instanceof ThirdPartySettingsInterface)) {
    return array();
  }

  $element = array();
  $definition = \Drupal::service('plugin.manager.field.field_type')->getDefinition($field->getType());
  $column_groups = $definition['column_groups'];
  if (!empty($column_groups) && count($column_groups) > 1) {
    $options = [];
    $default = [];
    $require_all_groups_for_translation = [];

    foreach ($column_groups as $group => $info) {
      $options[$group] = $info['label'];
      $default[$group] = !empty($info['translatable']) ? $group : FALSE;
      if (!empty($info['require_all_groups_for_translation'])) {
        $require_all_groups_for_translation[] = $group;
      }
    }

    $default = $field->getThirdPartySetting('content_translation', 'translation_sync', $default);

    $element = array(
      '#type' => 'checkboxes',
      '#title' => t('Translatable elements'),
      '#options' => $options,
      '#default_value' => $default,
    );

    if ($require_all_groups_for_translation) {
      // The actual checkboxes are sometimes rendered separately and the parent
      // element is ignored. Attach to the first option to ensure that this
      // does not get lost.
      $element[key($options)]['#attached']['drupalSettings']['contentTranslationDependentOptions'] = [
        'dependent_selectors' => [
          $element_name => $require_all_groups_for_translation
        ],
      ];
      $element[key($options)]['#attached']['library'][] = 'content_translation/drupal.content_translation.admin';
    }
  }

  return $element;
}