WidgetBase::form
public function WidgetBase::form
public WidgetBase::form(FieldItemListInterface $items, array &$form, FormStateInterface $form_state, $get_delta = NULL)
Creates a form element for a field.
If the entity associated with the form is new (i.e., $entity->isNew() is TRUE), the 'default value', if any, is pre-populated. Also allows other modules to alter the form element by implementing their own hooks.
Parameters
\Drupal\Core\Field\FieldItemListInterface $items: An array of the field values. When creating a new entity this may be NULL or an empty array to use default values.