public BookOutline::prevLink(array $book_link)
Fetches the book link for the previous 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 before the one represented in $book_link.
File
- core/modules/book/src/BookOutline.php, line 37
Class
- BookOutline
- Provides handling to render the book outline.
Namespace
Drupal\book
Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | public function prevLink(array $book_link) { // If the parent is zero, we are at the start of a book. if ($book_link['pid'] == 0) { return NULL; } // Assigning the array to $flat resets the array pointer for use with each(). $flat = $this->bookManager->bookTreeGetFlat($book_link); $curr = NULL; do { $prev = $curr; list($key, $curr) = each($flat); } while ($key && $key != $book_link['nid']); if ($key == $book_link['nid']) { // The previous page in the book may be a child of the previous visible link. if ($prev['depth'] == $book_link['depth']) { // The subtree will have only one link at the top level - get its data. $tree = $this->bookManager->bookSubtreeData($prev); $data = array_shift($tree); // The link of interest is the last child - iterate to find the deepest one. while ($data['below']) { $data = end($data['below']); } $this->bookManager->bookLinkTranslate($data['link']); return $data['link']; } else { $this->bookManager->bookLinkTranslate($prev); return $prev; } }} |
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