/*

* 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