2 files changed, 115 insertions, 0 deletions
diff --git a/modules/gallery/libraries/Display_Context.php b/modules/gallery/libraries/Display_Context.php
new file mode 100644
index 00000000..5054cffb
--- /dev/null
+++ b/modules/gallery/libraries/Display_Context.php
@@ -0,0 +1,71 @@
+<?php defined("SYSPATH") or die("No direct script access.");
+/**
+ * Gallery - a web based photo album viewer and editor
+ * Copyright (C) 2000-2011 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.
+ */
+
+abstract class Display_Context_Core {
+  private $_display_context_name;
+  private $_data;
+
+  static function factory($display_context_name=null) {
+    if (empty($display_context_name)) {
+      $display_context_id = Session::instance()->get("display_context_id", "");
+      $context = Cache::instance()->get($display_context_id, null);
+      $context = empty($context) ? new Item_Display_Context() : unserialize($context);
+    } else {
+      $class_prefix = ucfirst(strtolower($display_context_name));
+      $class_name = "{$class_prefix}_Display_Context";
+      $context = new $class_name();
+    }
+
+    return $context;
+  }
+
+  protected function __construct($display_context_name) {
+    // $this->reset($display_context_name);
+    $this->_data = array();
+    $this->_display_context_name = $display_context_name;
+  }
+
+  final function get($key) {
+    return empty($this->_data[$key]) ? null : $this->_data[$key];
+  }
+
+  final function set($key, $value=null) {
+    if (is_array($key)) {
+      if ((array)$key == $key) {
+        $this->_data = array_merge($this->_data, $key);
+      } else {
+        $this->_data = array_merge($this->_data, array_fill_keys($key, $value));
+      }
+    } else {
+      $this->_data[$key] = $value;
+    }
+    return $this;
+  }
+
+  final function save() {
+    $context_data = serialize($this);
+    $display_context_id = "display_context_" . md5($context_data);
+    Session::instance()->set("display_context_id", $display_context_id);
+    Cache::instance()->set($display_context_id, $context_data);
+    return $this;
+  }
+
+  abstract function display_context($item);
+}
diff --git a/modules/gallery/libraries/Item_Display_Context.php b/modules/gallery/libraries/Item_Display_Context.php
new file mode 100644
index 00000000..d0562790
--- /dev/null
+++ b/modules/gallery/libraries/Item_Display_Context.php
@@ -0,0 +1,44 @@
+<?php defined("SYSPATH") or die("No direct script access.");
+/**
+ * Gallery - a web based photo album viewer and editor
+ * Copyright (C) 2000-2011 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 Item_Display_Context_Core extends Display_Context {
+  protected function __construct() {
+    parent::__construct("item");
+  }
+
+  function display_context($item) {
+    $where = array(array("type", "!=", "album"));
+    $position = item::get_position($item, $where);
+    if ($position > 1) {
+      list ($previous_item, $ignore, $next_item) =
+        $item->parent()->viewable()->children(3, $position - 2, $where);
+    } else {
+      $previous_item = null;
+      list ($next_item) = $item->parent()->viewable()->children(1, $position, $where);
+   }
+
+    return array("position" =>$position,
+                 "previous_item" => $previous_item,
+                 "next_item" =>$next_item,
+                 "sibling_count" => $item->parent()->viewable()->children_count($where),
+                 "parents" => $item->parents()->as_array(),
+                 "breadcrumbs" => Breadcrumb::array_from_item_parents($item));
+  }
+}