Defines the behavior a confirmation form. Hierarchy interface \Drupal\Core\Form\

public FormState::setValidateHandlers(array $validate_handlers)

public FormStateDecoratorBase::hasFileElement()

public FormStateInterface::unsetValue($key)

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 FormState::getFormObject() Returns

public FormStateInterface::setCached($cache = TRUE)

public FormAjaxResponseBuilder::__construct(MainCon

public FormStateDecoratorBase::getBuildInfo()

public FormStateDecoratorBase::isValueEmpty($key)