/**
* {@inheritdoc}
*/
public function form(array $form, FormStateInterface $form_state)
{
$form['#title'] = $this->entity->label();
if (!isset($this->entity->book)) {
// The node is not part of any book yet - set default options.
$this->entity->book = $this->bookManager->getLinkDefaults($this->entity->id());
} else {
$this->entity->book['original_bid'] = $this->entity->book['bid'];
}
// Find the depth limit for the parent select.
if (!isset($this->entity->book['parent_depth_limit'])) {
$this->entity->book['parent_depth_limit'] = $this->bookManager->getParentDepthLimit($this->entity->book);
}
$form = $this->bookManager->addFormElements($form, $form_state, $this->entity, $this->currentUser(), FALSE);
return $form;
}
