Provides an generic base class for a confirmation form. Hierarchy class \Drupal\Core\Form\

The form state. Type:

public &FormStateInterface::getValue($key, $default = NULL)

public SubformState::setErrorByName($name, $message = '')

public static EnforcedResponse::createFromException(\Exception $e)

public FormCache::setCache($form_build_id, $form, FormStateInterface $form_state)

The form element that triggered submission, which may or may not be a button (in the case of Ajax forms). This key is often used to distinguish between various buttons in a

public FormStateDecoratorBase::getButtons()

public FormStateDecoratorBase::isSubmitted()

The current user. Type: