/*

* Copyright (c) 2004 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:  Monitors call status.

*

*/

#ifndef CVTCTLCALLSTATUSMONITOR_H

#define CVTCTLCALLSTATUSMONITOR_H

//  INCLUDES

#include "MVtCtlCallControl.h"

#include <e32base.h>

#include <etelmm.h>

/**

* Array for resolving call status (TMobileCallStatus) transition validity.

* Transition to lower value is not possible with exception to 0 priority

* (always possible to go to idle state). Initial state is EStatusUnknown.

*/

static const TInt KVtCtlStatusTransitionPriorities[] =

    { 

      1, //    EStatusUnknown

      0, //    EStatusIdle, possible from any

      2, //    EStatusDialling

      2, //    EStatusRinging

      3, //    EStatusAnswering

      3, //    EStatusConnecting

      4, //    EStatusConnected

      5, //    EStatusDisconnecting          

      // Status values below are not valid in video calls => should not happen.

      5, //    EStatusDisconnectingWithInband      

      0, //    EStatusReconnectPending

      0, //    EStatusHold

      0, //    EStatusWaitingAlternatingCallSwitch

      0, //    EStatusTransferring

      0  //    EStatusTransferAlerting

    };

// FORWARD DECLARATIONS

class MVtCtlCallStatusObserver;

// CLASS DECLARATION

/**

*  Monitor for call status

*

*  @lib CSCallCtrl

*  @since 2.6

*/

NONSHARABLE_CLASS( CVtCtlCallStatusMonitor ) : public CActive

    {

    public:  // Constructors and destructor

        /**

        * C++ constructor.

        * @param aCall call subsession

        * @param aObserver call status observer

        */

        /*****************************************************

        *   Series 60 Customer / ETel

        *   Series 60  ETel API

        *****************************************************/

        CVtCtlCallStatusMonitor( 

            RMobileCall& aCall,

            MVtCtlCallStatusObserver& aObserver );

        /**

        * Destructor.

        */

        virtual ~CVtCtlCallStatusMonitor();

    public: // New functions

        /**

        * Starts monitoring

        */

        void Start();

    private:  // From CActive

        /**

        * Cancel monitoring.

        */

        virtual void DoCancel();

        /**

        * Handles call status change.

        */

        virtual void RunL();

        /**

        * Handles leave in RunL.

        * @param aError error code

        * @return KErrNone

        */

        virtual TInt RunError( TInt aError );

    public: // New functions

        /**

        * Maps Etel status to internal state

        * @param aStatus mobile call status

        * @return session state, see TVtCtlState

        */

        /*****************************************************

        *   Series 60 Customer / ETel

        *   Series 60  ETel API

        *****************************************************/

        static MVtCtlCallControl::TVtCtlState MapState(

            const RMobileCall::TMobileCallStatus aStatus );

        /**

        * Checks if call state transition specified by arguments is legal.

        * @param aNewState proposed new call state

        * @param aCurrentState current call state

        * @return ETrue if transition is valid

        */

        static TBool IsLegalNewState(

            const RMobileCall::TMobileCallStatus aNewState,

            const RMobileCall::TMobileCallStatus aCurrentState );

    private:    // Data

        // Data call

        /*****************************************************

        *   Series 60 Customer / ETel

        *   Series 60  ETel API

        *****************************************************/

        RMobileCall& iCall;

        // Observer for call status changes

        MVtCtlCallStatusObserver& iObserver;

        // Call status and previous status

        /*****************************************************

        *   Series 60 Customer / ETel

        *   Series 60  ETel API

        *****************************************************/

        RMobileCall::TMobileCallStatus iCallStatus;

        RMobileCall::TMobileCallStatus iPreviousStatus;

    };

#endif      // CVTCTLCALLSTATUSMONITOR_H

// End of File