/*

* Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

* which accompanies this distribution, and is available

* at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  

*     Bio control observer.

*

*/

#ifndef __MSGBIOCONTROLOBSERVER_H_

#define __MSGBIOCONTROLOBSERVER_H_

// INCLUDES 

// CONSTANTS

// MACROS

// DATA TYPES

// FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

// FORWARD DECLARATIONS

// CLASS DECLARATION

/**

 * Interface for Bio Control Observer. The MMsgBioControlObserver is used

 * for observing the Bio Control from the editor application.

 */

class MMsgBioControlObserver

    {

    public:

        /**

         * The command types. For use in conjunction with the

         * functions of this class.

         */

        enum TMsgCommands

            {

            EMsgNone = 0,

            EMsgSave,

            EMsgReply,

            EMsgForwad,

            EMsgSend,

            EMsgAddressBook,          

            EMsgClose

            };

    public:

        /**

         * Returns the first free command id that a BIO control can use for

         * its own purposes. All the commands having ids of more or equal to

         * an id returned by this function are passed to the BIO control.

         * @return First free command.

         */

        virtual TInt FirstFreeCommand() const = 0;

        /**

         * Requests the BIO message editor/viewer to handle a command.

         * Typically the BIO message editor/viewer does not handle a requested

         * command immediately but after the BIO control has returned from the

         * HandleCommandL function.

         * @param aCommand The command that can be handled.

         * @return KerrNone or KerrNotSupported

         */

        virtual TInt RequestHandleCommandL(TMsgCommands aCommand) = 0;

        /**

         * Returns ETrue or EFalse whether a requested aCommand is supported

         * by the BIO message editor or not. This command should be used

         * before requesting command handling by RequestHandleCommand().

         * @param aCommand The command

         * @return ETrue if command is support and EFalse if not.

         */

        virtual TBool IsCommandSupported(TMsgCommands aCommand) const = 0;

    };

#endif // __MSGBIOCONTROLOBSERVER_H_

//end of file