/*

* 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:  Observer of accessory states.

*

*/

#ifndef CFMRADIOACCESSORYOBSERVER_H

#define CFMRADIOACCESSORYOBSERVER_H

#include <AccessoryServer.h>

#include <AccessoryMode.h>

#include <AccPolAccessoryMode.h>

class MFMRadioHeadsetEventObserver;

/**

 *  Observer of accessory states.  

 *

 *  Instance of this class observes notifications of headset state changes. 

 *  In its turn it sends notifications to its observer of those changes.

 *

 */

class CFMRadioAccessoryObserver : public CActive

    {

public:  

    /**

     * C++ default constructor.

     */

    CFMRadioAccessoryObserver();

    /**

     * Static constructor.

     */

    static CFMRadioAccessoryObserver* NewL();

    /**

     * Destructor.

     */

    virtual ~CFMRadioAccessoryObserver();

    /**

     * Sets observer. The observer will be notified when headset has been 

     * pressed or headset is connected/disconnected.

      *

     * @param aObserver Observer

     */

    void SetObserver( MFMRadioHeadsetEventObserver* aObserver );

    /**

     * Returns accessory connection state.

     *

     * @return <code>ETrue </code> if accessory is connected, 

     * <code>EFalse</code> otherwise

     */

    TBool IsHeadsetAccessoryConnected() const;

    // from base class CActive

    /**

     * From CActive

     *

     * @see CActive::RunL()

     */    

    void RunL();

    /**

     * From CActive

     *

     * @see CActive::DoCancel()

     */        

    void DoCancel();

protected:  

private: 

    /**

     * By default Symbian 2nd phase constructor is private.

     */

    void ConstructL();

public:

protected:

    /** 

     * Instance that gets notifications of the headset state changes 

     */

    MFMRadioHeadsetEventObserver* iObserver;

private:    // Data

    /** 

     * Session for The Accessory Server. 

     */

    RAccessoryServer iAccessoryServer;

    /** 

     * Accessory Mode sub-session 

     */            

    RAccessoryMode          iAccessoryModeSession;

    /** 

     * Accessory Mode structure, with active audio information. 

     */

    TAccPolAccessoryMode    iAccPolAccessoryMode;

    TAccPolAccessoryMode    iPrevAccMode;

    };

#endif      // CFMRADIOACCESSORYOBSERVER_H