function book_block_view

Implements hook_block_view().

Displays the book table of contents in a block when the current page is a single-node view of a book node.

File

modules/book/book.module, line 275

Code

function book_block_view($delta = '') {
    $block = array();
    $current_bid = 0;
    if ($node = menu_get_object()) {
        $current_bid = empty($node->book['bid']) ? 0 : $node->book['bid'];
    }
    if (variable_get('book_block_mode', 'all pages') == 'all pages') {
        $block['subject'] = t('Book navigation');
        $book_menus = array();
        $pseudo_tree = array(
            0 => array(
                'below' => FALSE,
            ),
        );
        foreach (book_get_books() 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.
                $book_menus[$book_id] = menu_tree_output(menu_tree_all_data($node->book['menu_name'], $node->book));
            }
            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.
                $book_node = node_load($book['nid']);
                $book['access'] = node_access('view', $book_node);
                $pseudo_tree[0]['link'] = $book;
                $book_menus[$book_id] = menu_tree_output($pseudo_tree);
            }
        }
        $book_menus['#theme'] = 'book_all_books_block';
        $block['content'] = $book_menus;
    }
    elseif ($current_bid) {
        // Only display this block when the user is browsing a book.
        $select = db_select('node', 'n')->fields('n', array(
            'title',
        ))
            ->condition('n.nid', $node->book['bid'])
            ->addTag('node_access');
        $title = $select->execute()
            ->fetchField();
        // Only show the block if the user has view access for the top-level node.
        if ($title) {
            $tree = menu_tree_all_data($node->book['menu_name'], $node->book);
            // There should only be one element at the top level.
            $data = array_shift($tree);
            $block['subject'] = theme('book_title_link', array(
                'link' => $data['link'],
            ));
            $block['content'] = $data['below'] ? menu_tree_output($data['below']) : '';
        }
    }
    return $block;
}