/*

* Copyright (c) 2006 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:  Video telephony engine class

*

*/

#ifndef CVTENGMODEL_H

#define CVTENGMODEL_H

//  INCLUDES

#include <e32base.h>

//#include <MVtEngEngine.h>

// CONSTANTS

//const ?type ?constant_var = ?constant;

// MACROS

//#define ?macro ?macro_def

// DATA TYPES

//enum ?declaration

//typedef ?declaration

//extern ?data_type;

// FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

class MVtEngEventObserver;

class MVtEngCommandObserver;

class CVtEngEventManager;

class CVtEngHandlerContainer;

class MVtEngCommandHandler;

class CVtEngCommandHandler;

class MVtEngSessionInfo;

class MVtEngMedia;

class MVtEngAudio;

class CVtEngStateManager;

class CVtEngUtility;

class CVtEngExtensions;

// CLASS DECLARATION

/**

*  Model for video telephony engine.

*

*  @lib videoteleng

*  @since 2.6

*/

NONSHARABLE_CLASS( CVtEngModel ) : public CBase

    {

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        * @param aEventObserver event observer

        * @param aCommandObserver command observer

        */

        IMPORT_C static CVtEngModel* NewL( 

            MVtEngEventObserver& aEventObserver,

            MVtEngCommandObserver& aCommandObserver );

        /**

        * Destructor.

        */

        IMPORT_C virtual ~CVtEngModel();

    public: // New functions

        IMPORT_C MVtEngCommandHandler& CommandHandler() const;

        IMPORT_C MVtEngSessionInfo& Session() const;

        IMPORT_C MVtEngMedia& Media() const;

        IMPORT_C MVtEngAudio& Audio() const;

        /**

        * Returns extension or NULL if extension cannot be found.

        * @param aExtensionUid extension uid

        * @return pointer to extension

        */

        IMPORT_C TAny* Extension( const TUid& aExtensionUid );

    protected:  // New functions

        /**

        * ?member_description.

        * @since ?Series60_version

        * @param ?arg1 ?description

        * @return ?description

        */

    protected:  // Functions from base classes

        /**

        * From ?base_class ?member_description

        */

    private:

        /**

        * C++ default constructor.

        */

        CVtEngModel();

        /**

        * By default Symbian 2nd phase constructor is private.

        */

        void ConstructL( MVtEngEventObserver& aEventObserver,

            MVtEngCommandObserver& aCommandObserver );    

    private:    // Data

        // Event manager acting as event mediator.

        CVtEngEventManager*     iEventManager;

        // Container for functional units.

        CVtEngHandlerContainer* iHandlers;

        // Handler for UI commands

        CVtEngCommandHandler*   iCommandHandler;

        // Manager for engine states

        CVtEngStateManager*     iStateManager;

        // Utility for TLS access

        CVtEngUtility*          iUtils;

        //  Container for engine extensions

        CVtEngExtensions* iExtensions;

    };

#endif      // CVTENGMODEL_H

// End of File