/*

* Copyright (c) 2008 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:  Sender class for mediator commands

*

*/

#ifndef C_VTENGMDTRCOMMANDSENDER_H

#define C_VTENGMDTRCOMMANDSENDER_H

//  INCLUDES

#include <e32cmn.h>

#include <mediatorcommandinitiator.h>

#include "MVtEngEventObserver.h"

// FORWARD DECLARATIONS

class CVtEngUtility;

class CVtEngOperation;

class CVtEngMdtrCommandSender;

class TVtMdtrStateIdle;

// CLASS DECLARATION

/**

*  Mediator command sender 

*

*  @lib videoteleng

*  @since 5.0

*/

NONSHARABLE_CLASS( CVtEngMdtrCommandSender ) :

    public CBase, 

    public MMediatorCommandResponseObserver,

    public MVtEngEventObserver

    {

public: // constructor and destructors

    /**

    * two-phase constructor

    */

    static CVtEngMdtrCommandSender* NewL( CVtEngUtility& aUtils );

    // Destructor

    ~CVtEngMdtrCommandSender();

public: // new methods

    /**

     * Requests telephony to end video call

     */

    void EndCall();

    /**

     * Requests telephony to fallback to voice call 

     */

    void VoiceFallback();

    /**

     * Requests telephony to make voice call 

     */

    void SwitchToVoiceL( CVtEngOperation& aOperation );

    /**

     * Notifies telephony about outgoing audio state change

     */

    void NotifyOutgoingAudioState( const TBool aMicEnabled );

    void SetSenderState( TVtMdtrStateIdle& aNewState );

public: // from MMediatorCommandResponseObserver

        // responses are not handled but required by mediator api

    virtual void CommandResponseL( TUid aDomain,

           TUid aCategory, 

           TInt aCommandId,

           TInt aStatus, 

           const TDesC8& aData );

public: // from MVtEngEventObserver

    // handles event accordint to ongoing operation

    virtual void HandleVtEventL( TInt aEvent );

private: // constructors

    CVtEngMdtrCommandSender( CVtEngUtility& aUtils );

    void ConstructL();

private:

    // for switch to voice operation, signaled when mediator command is issued.

    CVtEngOperation* iOperation;

    // for mediator command reception

    CMediatorCommandInitiator* iMediatorInitiator;

    CVtEngUtility& iUtils;

    TVtMdtrStateIdle* iSenderState;

    };

#endif // C_VTENGMDTRCOMMANDSENDER_H

// End of File