/**
* Fetches the book link for the previous page of the book.
*
* @param array $book_link
* A fully loaded book link that is part of the book hierarchy.
*
* @return array
* A fully loaded book link for the page before the one represented in
* $book_link.
*/
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;
}
}
}
/**
* Generates HTML for export when invoked by book_export().
*
* The given node is embedded to its absolute depth in a top level section. For
* example, a child node with depth 2 in the hierarchy is contained in
* (otherwise empty) <div> elements corresponding to depth 0 and depth 1.
* This is intended to support WYSIWYG output - e.g., level 3 sections always
* look like level 3 sections, no matter their depth relative to the node
* selected to be exported as printer-friendly HTML.
*
* @param \Drupal\node\NodeInterface $node
* The node to export.
*
* @throws \Exception
* Thrown when the node was not attached to a book.
*
* @return array
* A render array representing the HTML for a node and its children in the
* book hierarchy.
*/
public function bookExportHtml(NodeInterface $node)
{
if (!isset($node->book)) {
throw new \Exception();
}
$tree = $this->bookManager->bookSubtreeData($node->book);
$contents = $this->exportTraverse($tree, array($this, 'bookNodeExport'));
return array('#theme' => 'book_export_html', '#title' => $node->label(), '#contents' => $contents, '#depth' => $node->book['depth'], '#cache' => ['tags' => $node->getEntityType()->getListCacheTags()]);
}
/**
* Builds the table portion of the form for the book administration page.
*
* @param \Drupal\node\NodeInterface $node
* The node of the top-level page in the book.
* @param array $form
* The form that is being modified, passed by reference.
*
* @see self::buildForm()
*/
protected function bookAdminTable(NodeInterface $node, array &$form)
{
$form['table'] = array('#theme' => 'book_admin_table', '#tree' => TRUE);
$tree = $this->bookManager->bookSubtreeData($node->book);
// Do not include the book item itself.
$tree = array_shift($tree);
if ($tree['below']) {
$hash = Crypt::hashBase64(serialize($tree['below']));
// Store the hash value as a hidden form element so that we can detect
// if another user changed the book hierarchy.
$form['tree_hash'] = array('#type' => 'hidden', '#default_value' => $hash);
$form['tree_current_hash'] = array('#type' => 'value', '#value' => $hash);
$this->bookAdminTableTree($tree['below'], $form['table']);
}
}
/**
* Builds the table portion of the form for the book administration page.
*
* @param \Drupal\node\NodeInterface $node
* The node of the top-level page in the book.
* @param array $form
* The form that is being modified, passed by reference.
*
* @see self::buildForm()
*/
protected function bookAdminTable(NodeInterface $node, array &$form)
{
$form['table'] = array('#type' => 'table', '#header' => [$this->t('Title'), $this->t('Weight'), $this->t('Parent'), $this->t('Operations')], '#empty' => $this->t('No book content available.'), '#tabledrag' => [['action' => 'match', 'relationship' => 'parent', 'group' => 'book-pid', 'subgroup' => 'book-pid', 'source' => 'book-nid', 'hidden' => TRUE, 'limit' => BookManager::BOOK_MAX_DEPTH - 2], ['action' => 'order', 'relationship' => 'sibling', 'group' => 'book-weight']]);
$tree = $this->bookManager->bookSubtreeData($node->book);
// Do not include the book item itself.
$tree = array_shift($tree);
if ($tree['below']) {
$hash = Crypt::hashBase64(serialize($tree['below']));
// Store the hash value as a hidden form element so that we can detect
// if another user changed the book hierarchy.
$form['tree_hash'] = array('#type' => 'hidden', '#default_value' => $hash);
$form['tree_current_hash'] = array('#type' => 'value', '#value' => $hash);
$this->bookAdminTableTree($tree['below'], $form['table']);
}
}