--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wvuing/wvuieng/EngInc/MCAChatObserver.h	Thu Dec 17 08:41:52 2009 +0200
@@ -0,0 +1,73 @@
+/*
+* Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies). 
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  Observer interface to handle chat container changes.
+*
+*/
+
+
+#ifndef __MCACHATOBSERVER_H__
+#define __MCACHATOBSERVER_H__
+
+//  INCLUDES
+#include <e32def.h>
+
+//	FORWARD CLASS DECLERATIONS
+class MCAMessage;
+
+// CLASS DECLARATION
+
+/**
+ *  Observer interface to handle messages container changes.
+ *
+ *  @lib CAEngine.dll
+ *  @since 3.0
+ */
+class MCAChatObserver
+    {
+
+    public: // Definitions
+
+        /**
+         * Events for observer to handle.
+         */
+        enum TChatEventType
+            {
+            EGroupListChanged,
+            EChatListChanged,
+            ESendListChanged,
+            EUnreadCountChanged, // Happens with new message and when messages are read.
+            EMemoryLow,
+            EEventNotSpecified
+            };
+
+    public: // Interface
+
+        /**
+         * Handle events.
+         * @param aEvent Event to handle.
+         * @param aMessage, Event occurred because of message
+         */
+        virtual void HandleChatEvent( TChatEventType aEvent, MCAMessage* aMessage = NULL ) = 0;
+
+    protected: // For protection.
+
+        /**
+         * Destructor
+         */
+        virtual ~MCAChatObserver() {}
+    };
+
+#endif      // __MCACHATOBSERVER_H__
+
+// End of File