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<?php
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/**
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* @file dhtml_menu.theme.inc
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* All functions related to generating the menu markup.
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*/
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/**
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* Preprocessor for menu_link.
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* Adds the required HTML attributes and loads subtrees if necessary.
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*/
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function dhtml_menu_preprocess_menu_link(&$variables) {
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$cookie = &drupal_static(__FUNCTION__);
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$settings = variable_get('dhtml_menu_settings');
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// Parse the cookie, if it is enabled.
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if (!isset($cookie)) {
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if ($settings['effects']['remember'] && $settings['nav'] != 'open' && $settings['effects']['siblings'] != 'close-all') {
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$cookie = explode(',', @$_COOKIE['dhtml_menu']);
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}
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else {
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$cookie = array();
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}
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}
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// Saves a lot of code.
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$l = &$variables['element']['#original_link'];
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if (empty($l)) {
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return;
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}
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// Determine if the menu is blacklisted or not whitelisted.
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// First check menu blocks.
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if (!empty($variables['element']['#bid']['module']) &&
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!empty($variables['element']['#bid']['delta']) &&
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$variables['element']['#bid']['module'] == 'menu_block') {
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$checked = !empty($settings['filter']['menu_block']['menu_block_' . $variables['element']['#bid']['delta']]);
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if ($checked == ($settings['filter']['type'] == 'blacklist')) {
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// This menu block is either blacklisted, or not whitelisted, hence it is disabled.
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return;
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}
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}
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// Then check menus.
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else {
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$disabled = ($settings['filter']['type'] == 'blacklist') == !empty($settings['filter']['list'][$l['menu_name']]);
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if (empty($l['menu_name']) || empty($l['mlid']) || $disabled) {
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return;
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}
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}
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// Add the ID and class attributes.
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$variables['element']['#attributes']['id'] = 'dhtml_menu-' . _dhtml_menu_unique_id($l['mlid']);
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$variables['element']['#attributes']['class'][] = 'dhtml-menu';
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// If there are children, but they were not loaded, load them.
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if ($l['has_children'] && !$variables['element']['#below']) {
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$variables['element']['#below'] = _dhtml_menu_subtree($l['menu_name'], $l['mlid']);
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}
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// If the current item can expand, and is neither saved as open nor in the active trail, close it.
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if ($l['has_children'] && !$l['in_active_trail'] && !in_array($variables['element']['#attributes']['id'], $cookie)) {
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if (!in_array('collapsed', $variables['element']['#attributes']['class'])) {
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$variables['element']['#attributes']['class'][] = 'collapsed';
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}
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if (!in_array('start-collapsed', $variables['element']['#attributes']['class'])) {
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$variables['element']['#attributes']['class'][] = 'start-collapsed';
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}
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}
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}
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/**
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* Traverses the menu tree and returns the sub-tree of the item
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* indicated by the parameter.
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*
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* @param $menu_name
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* The internal name of the menu.
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* @param $mlid
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* The menu link ID.
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*
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* @return
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* The tree below the menu item, as a renderable array, or an empty array.
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*/
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function _dhtml_menu_subtree($menu_name, $mlid) {
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static $index = array();
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static $indexed = array();
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// This looks expensive, but menu_tree_all_data uses static caching.
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$tree = menu_tree_all_data($menu_name);
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// Index the menu tree to find ancestor paths for each item.
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if (!isset($indexed[$menu_name])) {
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$index += _dhtml_menu_index($tree);
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$indexed[$menu_name] = TRUE;
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}
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// If the menu tree does not contain this item, stop.
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if (!isset($index[$mlid])) {
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return array();
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}
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// Traverse the tree using the ancestor path.
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foreach ($index[$mlid]['parents'] as $id) {
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$key = $index[$id]['key'];
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if (isset($tree[$key])) {
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$tree = $tree[$key]['below'];
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}
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else {
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return array();
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}
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}
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// Go one level further to go below the current item.
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$key = $index[$mlid]['key'];
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return isset($tree[$key]) ? menu_tree_output($tree[$key]['below']) : array();
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}
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/**
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* Indexes the menu tree by mlid. This is needed to identify the items
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* without relying on titles or stacks. This function is recursive.
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*
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* @param $tree
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* A tree of menu items such as the return value of menu_tree_all_data().
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* @param $ancestors
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* Optional, used only by internal recursion.
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* @param $parent
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* Optional, used only by internal recursion.
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*
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* @return
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* An array associating mlid values with the internal keys of the menu tree,
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* and all the mlids of the item's ancestors.
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*/
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function _dhtml_menu_index($tree, $ancestors = array(), $parent = NULL) {
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$index = array();
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if ($parent) {
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$ancestors[] = $parent;
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}
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foreach ($tree as $key => $item) {
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$index[$item['link']['mlid']] = array(
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'key' => $key,
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'parents' => $ancestors,
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);
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if (!empty($item['below'])) {
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$index += _dhtml_menu_index($item['below'], $ancestors, $item['link']['mlid']);
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}
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}
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return $index;
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}
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/**
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* Keeps track of ID attributes and adds a suffix to make it unique-when necessary.
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*/
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function _dhtml_menu_unique_id($id) {
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static $ids = array();
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if (!isset($ids[$id])) {
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$ids[$id] = 1;
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return $id;
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}
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else {
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return $id . '-' . $ids[$id]++;
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}
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}
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