/**
* {@inheritdoc}
*/
public function build()
{
$current_bid = 0;
if ($node = $this->requestStack->getCurrentRequest()->get('node')) {
$current_bid = empty($node->book['bid']) ? 0 : $node->book['bid'];
}
if ($this->configuration['block_mode'] == 'all pages') {
$book_menus = array();
$pseudo_tree = array(0 => array('below' => FALSE));
foreach ($this->bookManager->getAllBooks() as $book_id => $book) {
if ($book['bid'] == $current_bid) {
// If the current page is a node associated with a book, the menu
// needs to be retrieved.
$data = $this->bookManager->bookTreeAllData($node->book['bid'], $node->book);
$book_menus[$book_id] = $this->bookManager->bookTreeOutput($data);
} else {
// Since we know we will only display a link to the top node, there
// is no reason to run an additional menu tree query for each book.
$book['in_active_trail'] = FALSE;
// Check whether user can access the book link.
$book_node = $this->nodeStorage->load($book['nid']);
$book['access'] = $book_node->access('view');
$pseudo_tree[0]['link'] = $book;
$book_menus[$book_id] = $this->bookManager->bookTreeOutput($pseudo_tree);
}
$book_menus[$book_id] += array('#book_title' => $book['title']);
}
if ($book_menus) {
return array('#theme' => 'book_all_books_block') + $book_menus;
}
} elseif ($current_bid) {
// Only display this block when the user is browsing a book.
$query = \Drupal::entityQuery('node');
$nid = $query->condition('nid', $node->book['bid'], '=')->execute();
// Only show the block if the user has view access for the top-level node.
if ($nid) {
$tree = $this->bookManager->bookTreeAllData($node->book['bid'], $node->book);
// There should only be one element at the top level.
$data = array_shift($tree);
$below = $this->bookManager->bookTreeOutput($data['below']);
if (!empty($below)) {
return $below;
}
}
}
return array();
}
/**
* Formats the book links for the child pages of the current page.
*
* @param array $book_link
* A fully loaded book link that is part of the book hierarchy.
*
* @return array
* HTML for the links to the child pages of the current page.
*/
public function childrenLinks(array $book_link)
{
$flat = $this->bookManager->bookTreeGetFlat($book_link);
$children = array();
if ($book_link['has_children']) {
// Walk through the array until we find the current page.
do {
$link = array_shift($flat);
} while ($link && $link['nid'] != $book_link['nid']);
// Continue though the array and collect the links whose parent is this page.
while (($link = array_shift($flat)) && $link['pid'] == $book_link['nid']) {
$data['link'] = $link;
$data['below'] = '';
$children[] = $data;
}
}
if ($children) {
return $this->bookManager->bookTreeOutput($children);
}
return '';
}