Displays the book outline form. Hierarchy class \Drupal\Core\Form\

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

Stores flattened book trees. Type:

Provides handling to render the book outline. Hierarchy class \Drupal\book\

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

The entity query for node. Type:

public BookAdminEditForm::validateForm(array &$form

The node storage. Type:

public BookOutlineStorageInterface::del

protected BookManager::updateParent(array $link)