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   1  <?php
   2  // $Id: menu_block.follow.inc,v 1.4 2010/03/22 14:11:27 johnalbin Exp $
   3  
   4  /**
   5   * @file
   6   * Provides active menu item pruning.
   7   */
   8  
   9  /**
  10   * Prune a tree so that it begins at the active menu item.
  11   *
  12   * @param $tree
  13   *   array The menu tree to prune.
  14   * @param $level
  15   *   string The level which the tree will be pruned to: 'active' or 'child'.
  16   * @return
  17   *   void
  18   */
  19  function _menu_tree_prune_active_tree(&$tree, $level) {
  20    do {
  21      $found_active_trail = FALSE;
  22      // Examine each element at this level for the active trail.
  23      foreach (array_keys($tree) AS $key) {
  24        if ($tree[$key]['link']['in_active_trail']) {
  25          $found_active_trail = TRUE;
  26          // If the active trail item has children, examine them.
  27          if ($tree[$key]['below']) {
  28            // If we are pruning to the active menu item's level, check if this
  29            // is the active menu item by checking its children.
  30            if ($level == 'active') {
  31              foreach (array_keys($tree[$key]['below']) AS $child_key) {
  32                if ($tree[$key]['below'][$child_key]['link']['in_active_trail']) {
  33                  // Get the title for the pruned tree.
  34                  menu_block_set_title($tree[$key]['link']);
  35                  $tree = $tree[$key]['below'];
  36                  // Continue in the pruned tree.
  37                  break 2;
  38                }
  39              }
  40              // If we've found the active item, we're done.
  41              break 2;
  42            }
  43            // Set the title for the pruned tree.
  44            menu_block_set_title($tree[$key]['link']);
  45            // If we are pruning to the children of the active menu item, just
  46            // prune the tree to the children of the item in the active trail.
  47            $tree = $tree[$key]['below'];
  48            // Continue in the pruned tree.
  49            break;
  50          }
  51          // If the active menu item has no children, we're done.
  52          else {
  53            if ($level == 'child') {
  54              $tree = array();
  55            }
  56            break 2;
  57          }
  58        }
  59      }
  60    } while ($found_active_trail);
  61  }