/*

* 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:  DOS Server Monitor Class is used to monitor Audio Accessorries,

*                and encapsulate the interfaces with DOS Server.

*

*/

#ifndef CHeadsetButtonMonitor_H

#define CHeadsetButtonMonitor_H

#include <e32base.h>

#include <dossvrservices.h>

#include <psvariables.h>		// Property values

/**

* DOS Server Monitor Class is used to monitor Audio Accessorries,

* and encapsulate the interfaces with DOS Server.

*/

class CVoiceProgressDialog;

class CPlaybackVoiceDialog;

class CHeadsetButtonMonitor : public CDosEventListenerBase

    {

    public: // Constructors and destructor

        /**

        * The CVoiceTagHeadsetButtonMonitor destructor

        * @param 

        * @return 

        */   

        virtual ~CHeadsetButtonMonitor();

        /**

        * 2nd phase CVoiceTagHeadsetButtonMonitor constructor

        * @param aObserver - an observer to be notified when the disruption occurred.

        * @return a pointer to the new CActiveClass0SMSMonitor object

        */   

        static CHeadsetButtonMonitor* NewLC();

        /**

        * 2nd phase CVoiceTagHeadsetButtonMonitor constructor

        * @param aObserver - an observer to be notified when the disruption occurred.

        * @return a pointer to the new CActiveClass0SMSMonitor object

        */   

        static CHeadsetButtonMonitor* NewL();

    public:

        /**

        * Method to handle the registration for Audio Accessories disruption monitor.

        * @param aDisruptionType - a disruption type to be monitored

        * @return - Symbian standard error response

        */   

        TInt ActivateMonitorL();

        /**

        * Method to handle the deregistration of monitoring class 0 SMS

        * @param aDisruptionType - a disruption type to be stopped monitoring

        * @return 

        */  

        TInt DeActivateMonitor();

        /**

        * Method to handle the deregistration of monitoring class 0 SMS

        * @param aDisruptionType - a disruption type to be stopped monitoring

        * @return 

        */  

        void Register(CVoiceProgressDialog* aProgressObserver,CPlaybackVoiceCommandDialog* aPlaybackObserver);

        /**

        * Method to handle the deregistration of monitoring class 0 SMS

        * @param aDisruptionType - a disruption type to be stopped monitoring

        * @return 

        */  

        void DeRegister(CVoiceProgressDialog* aProgressObserver,CPlaybackVoiceCommandDialog* aPlaybackObserver);

        /**

        * Method to cancel the monitoring operation from Dos Server

        * @param 

        * @return 

        */   

        void CancelMonitor();

    protected:

        /**

        * It notifies about a change in the status of the headset.

        * @param aStatus The new status.

        * @return void

        */ 

		void HeadsetButtonChangedL(EPSButtonState aState);

        /**

        * Handles headset button down operation

        * @return void

        */

        void HandleButtonDown();

        /**

        * Handles head set button up operation

        * return void

        */

        void HandleButtonUp();

        /**

        * Handles head set button long press down operation

        * return void

        */

        void HandleButtonDownLong();

      private:

        /**

        * 2nd phase CVoiceTagHeadsetButtonMonitor constructor

        * @param 

        * @return 

        */   

        void ConstructL();

       /**

        * The CVoiceTagHeadsetButtonMonitor constructor

        * @param aObserver - an observer to be notified when the disruption occurred.

        * @return 

        */   

        CHeadsetButtonMonitor ();

    private: // data

        RDosServer                   iDosServerSession;

        CVoiceProgressDialog*        iProgressObserver;

        CPlaybackVoiceCommandDialog* iPlaybackObserver;

        TBool                        iButtonDown;

    };

#endif // CHeadsetButtonMonitor_H

// End of File