Index: branches/RC/core/units/categories/categories_event_handler.php
===================================================================
diff -u -r8929 -r9040
--- branches/RC/core/units/categories/categories_event_handler.php	(.../categories_event_handler.php)	(revision 8929)
+++ branches/RC/core/units/categories/categories_event_handler.php	(.../categories_event_handler.php)	(revision 9040)
@@ -464,7 +464,51 @@
 
 		parent::OnPreSaveCreated($event);
 	}
+	
+	
+	/**
+	* Exclude root categories from deleting
+	*
+	* @param kEvent $event
+	*/
+	function customProcessing(&$event, $type)
+	{	
+		if (!$this->Application->ConfigValue('m_AllowDeleteRootCats')) {
+			
+			if ($event->Name == 'OnMassDelete' && $type == 'before') {
 
+				$ids = $event->getEventParam('ids');
+
+				if ($ids) {
+
+					// get module roots and exclude them
+					foreach ($this->Application->ModuleInfo as $module_name => $module_data) {
+						if ((int)$module_data['RootCat'])
+						$ids_exclude[] = (int)$module_data['RootCat'];
+					}
+
+					if ($ids_exclude && array_intersect($ids, $ids_exclude))
+					{
+						$ids = array_diff($ids, $ids_exclude);
+						$this->Application->StoreVar('root_delete_error', 1);
+					}
+
+					/*
+					$id_field = $this->Application->getUnitOption($event->Prefix, 'IDField');
+					$table_name = $this->Application->getUnitOption($event->Prefix, 'TableName');
+
+					$sql = 'SELECT '.$id_field.'
+					FROM '.$table_name.'
+					WHERE '.$id_field.' IN ('.implode(',', $ids).').';
+					$event->setEventParam('ids', $this->Conn->GetCol($sql));
+					*/
+
+					$event->setEventParam('ids', $ids);
+				}
+			}
+		}
+	}
+
 	/**
 	 * Deletes all selected items.
 	 * Automatically recurse into sub-items using temp handler, and deletes sub-items
@@ -477,10 +521,16 @@
 		if ($this->Application->CheckPermission('SYSTEM_ACCESS.READONLY', 1)) {
 			return;
 		}
+		
 
 //		$event->status = erSUCCESS;
 
 		$ids = $this->StoreSelectedIDs($event);
+
+		$event->setEventParam('ids', $ids);
+		$this->customProcessing($event, 'before');
+		$ids = $event->getEventParam('ids');
+		
 		if ($ids) {
 			$recursive_helper =& $this->Application->recallObject('RecursiveHelper');
 			/* @var $recursive_helper kRecursiveHelper */