/*

* 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:  Volume control adjusts engine side volume values.

*

*/

#ifndef CVTUIVOLUMECONTROL_H

#define CVTUIVOLUMECONTROL_H

#include    <e32base.h>

#include    <mvtengcommandobserver.h>

#include    <mvtengaudio.h>

class MVtEngCommandHandler;

class MVtUiEngineCommandManager;

class CVtUiFeatureManager;

/**

*  Volume control adjusts engine side volume values.

*

*  @since Series 60 v5.0

*/

class CVtUiVolumeControl

    : public CBase,

      private MVtEngCommandObserver

    {

    public: // Constructors and destructor

    // Type for volume settings.

    typedef MVtEngAudio::TVtEngOutputVolume TVolume;

    /**

    * Constructor.

    *

    * @param aSelfPtr optional pointer to itself.

    * @param aCommandHandler command handler.

    * @param aAudio audio interface.

    * @param aCommandManager command manager.

    * @param aFeatureManager Reference to feature manager.

    */

    CVtUiVolumeControl(

        MVtEngCommandHandler& aCommandHandler,

        MVtEngAudio& aAudio,

        MVtUiEngineCommandManager& aCommandManager,

        CVtUiFeatureManager& aFeatureManager );

    /*

    * 2nd phase constructor

    */

    void ConstructL();

    /**

    * Destructor.

    */

    ~CVtUiVolumeControl();

public: // New functions

    // Adjust volume to new value

    void AdjustVolumeL( TVolume aVolume );

private:

    /**

    * @see MVtEngCommandObserver::HandleVTCommandPerformedL.

    */

    virtual void HandleVTCommandPerformedL(

        TVtEngCommandId aCommand,

        const TInt aError );

    // Checks if volume is changed in slider

    TBool IsVolumeChangedL();

private:

    // Reference to command handler.

    MVtEngCommandHandler& iCommandHandler;

    // Reference to audio interface.

    MVtEngAudio& iAudio;

    // Reference to command manager.

    MVtUiEngineCommandManager& iCommandManager;

    // ETrue if command is performed.

    TBool iCommandPerformed;

    // Volume being updated to engine.

    TVolume iVolume;

    // Volume pointer descriptor.

    TPtrC8 iVolumePtr;

    // Reference to featuremanager

    CVtUiFeatureManager& iFeatureManager;

    // Is control adjusting volume

    TBool iIsActive;

    };

#endif      // CVtUiVolumeControl_H

// End of File