The renderer. Type:

public BookRemoveForm::buildForm(array $form, FormStateInterface

Stores flattened book trees. Type:

public static BookController::create(ContainerInterface

book_node_prepare_form(NodeInterface $node, $operation, FormStateInterface $form_state) Implements

book_type_is_allowed($type) Determines if a given node type is in the list of types allowed for books.

public BookOutlineStorageInterface::hasBooks()

protected BookManager::updateParent(array $link)

Controller routines for book routes. Hierarchy class \Drupal\Core\Controller\

public BookSettingsForm::submitForm(array &$form, FormStateInterface