/*

* Copyright (c) 2007-2009 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:  Interface definition for esmricalviewer callback

*

*/

#ifndef MESMRICALVIEWERCALLBACK_H

#define MESMRICALVIEWERCALLBACK_H

// INCLUDES

//<cmail>

#include "esmricalvieweropcodes.hrh"   // tesmricalvieweroperationtype

//</cmail>

// FORWARD DECLARATIONS

class CFSMailMessage;

class MESMRIcalViewerObserver;

// CLASS DECLARATIONS

/**

 * MESMRIcalViewerCallback implements callback interface

 * for esmricalviewer.

 */

class MESMRIcalViewerCallback

    {

    public:

        /**

         * Virtual destructor

         */

        virtual ~MESMRIcalViewerCallback() { }

    public: // Interface

        /**

         * Processes given command asynchronously.

         * @param aCommandId Command to be processed.

         * @param aMessage Reference to mail message.

         * @param aObserver Observer for asynchronous operations

         * @exception KErrNotSupported if the command is not supported

         */

        virtual void ProcessAsyncCommandL(

                TESMRIcalViewerOperationType aCommandId,

                const CFSMailMessage& aMessage,

                MESMRIcalViewerObserver* aObserver = NULL ) = 0;

        /**

         * Processes given command synchronously.

         * @param aCommandId Command to be processed.

         * @param aMessage Reference to mail message.

         * @exception KErrNotSupported if the command is not supported

         */

        virtual void ProcessSyncCommandL(

                TESMRIcalViewerOperationType aCommandId,

                const CFSMailMessage& aMessage ) = 0;

        /**

         * Tests if callback can process command.

         * @param aCommandId Command to be processed.

         * @return ETrue if callback can process command.

         */

        virtual TBool CanProcessCommand(

                TESMRIcalViewerOperationType aCommandId ) const = 0;

        /**

        * Returns an extension point for this interface or NULL.

        * @param aExtensionUid Uid of extension.

        * @return Extension point or NULL.

        */

        virtual TAny* MRIcalViewerCallbackExtension(

              TUid /*aExtensionUid*/) { return NULL; }

    };

#endif // MESMRICALVIEWERCALLBACK_H

// EOF