<?php

/**
 * @file
 * Default theme implementation to navigate books. Presented under nodes that
 * are a part of book outlines.
 *
 * Available variables:
 * - $tree: The immediate children of the current node rendered as an
 *	 unordered list.
 * - $current_depth: Depth of the current node within the book outline.
 *	 Provided for context.
 * - $prev_url: URL to the previous node.
 * - $prev_title: Title of the previous node.
 * - $parent_url: URL to the parent node.
 * - $parent_title: Title of the parent node. Not printed by default. Provided
 *	 as an option.
 * - $next_url: URL to the next node.
 * - $next_title: Title of the next node.
 * - $has_links: Flags TRUE whenever the previous, parent or next data has a
 *	 value.
 * - $book_id: The book ID of the current outline being viewed. Same as the
 *	 node ID containing the entire outline. Provided for context.
 * - $book_url: The book/node URL of the current outline being viewed.
 *	 Provided as an option. Not used by default.
 * - $book_title: The book/node title of the current outline being viewed.
 *	 Provided as an option. Not used by default.
 *
 * @see template_preprocess_book_navigation()
 */
?>
<?php if ( $tree || $has_links ) : ?>
	<div id="book-navigation-<?php print $book_id; ?>" class="book-navigation clearfix">
		<?php print $tree;

		if ( $has_links ) : ?>
			<div class="links page-links clearfix">
				<?php if ( $prev_url ) : ?>
					<a href="<?php print $prev_url; ?>" class="page-previous" title="<?php print t( 'Go to previous page' ); ?>"><?php print t( '‹ ' ) . $prev_title; ?></a>
				<?php endif;
				if ( $parent_url ) : ?>
					<a href="<?php print $parent_url; ?>" class="page-up" title="<?php print t( 'Go to parent page' ); ?>"><?php print t( 'up' ); ?></a>
				<?php endif;
				if ( $next_url ) : ?>
					<a href="<?php print $next_url; ?>" class="page-next" title="<?php print t( 'Go to next page' ); ?>"><?php print $next_title . t( ' ›' ); ?></a>
				<?php endif; ?>
			</div>
		<?php endif; ?>
	</div><!-- /.book-navigation -->
<?php endif; ?>