public FormStateInterface::setValue($key, $value)

public FormStateInterface::isSubmitted()

public static FormStateInterface::hasAnyErrors()

public FormStateInterface::setButtons(array $buttons)

public FormStateInterface::prepareCallback($callback)

public FormStateInterface::setResponse(Response $response)

public FormStateInterface::clearErrors()

public FormStateInterface::setAlwaysProcess($always_process =

public FormStateInterface::setGroups(array $groups)

public &FormStateInterface::getCompleteForm()