public BookManagerInterface::bookTreeCheckAccess(&$tree

book_pick_book_nojs_submit($form, FormStateInterface $form_state) Form submission handler for node_form().

public BookOutlineStorage::getBookMenuTree($bid, $parameters

public BookManager::checkNodeIsRemovable(NodeInterface $node)

The node storage. Type:

protected BookManager::recurseTableOfContents(array $tree, $indent, array

public BookOutlineStorageInterface::loadMultiple($nids

protected BookManager::flatBookTree(array $tree, array &$flat)

public BookManager::addFormElements(array $form, FormStateInterface $form_state

The renderer. Type: