public function BookOutline::nextLink in Drupal 9

Same name and namespace in other branches

1. 8 core/modules/book/src/BookOutline.php \Drupal\book\BookOutline::nextLink()

Fetches the book link for the next page of the book.

Parameters

array $book_link: A fully loaded book link that is part of the book hierarchy.

Return value

array A fully loaded book link for the page after the one represented in $book_link.

File

core/modules/book/src/BookOutline.php, line 82

Class

BookOutline

Provides handling to render the book outline.

Namespace

Drupal\book

Code

public function nextLink(array $book_link) {
  $flat = $this->bookManager
    ->bookTreeGetFlat($book_link);
  reset($flat);
  do {
    $key = key($flat);
    next($flat);
  } while ($key && $key != $book_link['nid']);
  if ($key == $book_link['nid']) {
    $next = current($flat);
    if ($next) {
      $this->bookManager
        ->bookLinkTranslate($next);
    }
    return $next;
  }
}