Paginator for user manager admin view

Closes ticket #1557
Note: also optimizes the way item count is retrieved for users, saving <user_count>-1 queries when displaying this page

modules/gallery/libraries/MY_Controller.php

@@ -0,0 +1,26 @@
+<?php defined("SYSPATH") or die("No direct script access.");
+/**
+ * Gallery - a web based photo album viewer and editor
+ * Copyright (C) 2000-2010 Bharat Mediratta
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+class Controller extends Controller_Core {
+  public function get_pager_params($page, $item_count, $items_per_page) {
+    $offset = ($page - 1) * $items_per_page;
+    $max_pages = max(ceil($item_count / $items_per_page), 1);
+    return array($offset, $max_pages);
+  }
+}