public WidgetBaseInterface::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.
\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.
array $form: An array representing the form that the editing element will be attached to.
\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.
int $get_delta: Used to get only a specific delta value of a multiple value field.
array The form element array created for this field.
public function form(FieldItemListInterface $items, array &$form, FormStateInterface $form_state, $get_delta = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!WidgetBaseInterface.php/function/WidgetBaseInterface::form/8.1.x