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);
+  }
+}

modules/user/controllers/admin_users.php

@@ -22,8 +22,40 @@ class Admin_Users_Controller extends Admin_Controller {
     $view = new Admin_View("admin.html");
     $view->page_title = t("Users and groups");
     $view->content = new View("admin_users.html");
-    $view->content->users = ORM::factory("user")->order_by("name", "ASC")->find_all();
+
+    // @todo: add this as a config option
+    $page_size = module::get_var("user", "page_size", 10);
+    $page = Input::instance()->get("page", "1");
+    $builder = db::build();
+    $user_count = $builder->from("users")->count_records();
+    list($offset, $max_pages) = Controller::get_pager_params($page, $user_count, $page_size);
+
+    // Make sure that the page references a valid offset
+    if ($page < 1) {
+      url::redirect(url::merge(array("page" => 1)));
+    } else if ($page > $max_pages) {
+      url::redirect(url::merge(array("page" => $max_pages)));
+    }
+    $view->content->users = ORM::factory("user")
+        ->select(array("users.id", "users.admin", "users.name", "users.email", "users.full_name",
+                       "users.last_login", "users.guest", db::expr("COUNT(items.id) as item_count")))
+        ->join("items", "items.owner_id", "users.id", "LEFT")
+        ->group_by("users.id")
+        ->order_by("users.name", "ASC")
+        ->find_all($page_size, $offset);
+
     $view->content->groups = ORM::factory("group")->order_by("name", "ASC")->find_all();
+    $view->content->page = $page;
+    $view->content->max_pages = $max_pages;
+
+    if ($page < $max_pages) {
+      $view->content->next_page_url = url::site(url::merge(array("page" => $page + 1)));
+    }
+    if ( $page > 1 )
+    {
+      $view->content->previous_page_url = url::site(url::merge(array("page" => $page - 1)));
+    }
+
     print $view;
   }
 

modules/user/views/admin_users.html.php

@@ -88,7 +88,7 @@
               <?= ($user->last_login == 0) ? "" : gallery::date($user->last_login) ?>
             </td>
             <td>
-              <?= db::build()->from("items")->where("owner_id", "=", $user->id)->count_records() ?>
+              <?= $user->item_count ?>
             </td>
             <td>
               <a href="<?= url::site("admin/users/edit_user_form/$user->id") ?>"
@@ -108,6 +108,35 @@
           </tr>
           <? endforeach ?>
         </table>
+
+        <div class="g-right">
+          <? if (isset($previous_page_url)): ?>
+            <a href="<?= $previous_page_url ?>"
+                class="g-button ui-icon-left ui-state-default ui-corner-all"
+                title="<?= t("Previous page")->for_html_attr() ?>">
+          <? else: ?>
+            <a class="g-button ui-icon-left ui-state-disabled ui-corner-all"
+                title="<?= t("Previous page")->for_html_attr() ?>">
+          <? endif ?>
+            <span class="ui-icon ui-icon-circle-plus"></span>
+            <?= t("Previous") ?>
+          </a>
+
+          <?= t("Page %current of %total", array("current"=>$page, "total"=>$max_pages)) ?>
+
+          <? if (isset($next_page_url)): ?>
+            <a href="<?= $next_page_url ?>"
+                class="g-button ui-icon-left ui-state-default ui-corner-all"
+                title="<?= t("Next page")->for_html_attr() ?>">
+          <? else: ?>
+            <a class="g-button ui-icon-left ui-state-disabled ui-corner-all"
+                title="<?= t("Next page")->for_html_attr() ?>">
+          <? endif ?>
+            <span class="ui-icon ui-icon-circle-plus"></span>
+            <?= t("Next") ?>
+          </a>
+        </div>
+
       </div>
     </div>