/*

* 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:  Observer for generic upnp volume state machine

*

*/

#ifndef C_UPNPVOLUMESTATEMACHINEOBSERVER_H

#define C_UPNPVOLUMESTATEMACHINEOBSERVER_H

// INCLUDES

#include <e32base.h>

/**

 * Class for receiving callbacks from

 * CUPnPVolumeStateMachine

 *

 * @lib upnpavcontrollerhelper.lib

 */

class MUpnpVolumeStateMachineObserver

    {

public:

    /**

     * Indicates state machine has been synchronised with the renderer

     * @param aError error that occurred during sync

     */

    virtual void VolumeSyncReady( TInt aError ) = 0;

    /**

     * Indicates volume state has been changed

     * either by request or spontanelously.

     * @param aError the error code

     * @param aRenderingSession for playback commands

     * @param aUserOriented ETrue if this responds to a request

     */

    virtual void VolumeChanged(

        TInt aError, TInt aVolume, TBool aUserOriented ) = 0;

    /**

     * Indicates mute state has been changed

     * either by request or spontanelously.

     * @param aError the error code

     * @param aMuteState current mute state

     * @param aUserOriented ETrue if this responds to a request

     */

    virtual void MuteChanged(

        TInt aError, TBool aMuteState, TBool aUserOriented ) = 0;

    };

#endif // C_UPNPVOLUMESTATEMACHINEOBSERVER_H