/*

* 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:  Interface for state objects to request application services.

*

*/

#ifndef M_MLCVTSTATECONTEXT_H

#define M_MLCVTSTATECONTEXT_H

#include <e32def.h> 

#include <vtengcommands.h>

#include "mlcvtshutterobserver.h"

class TLcVtStateBase;

class CVtEngModel;

/**

* Provides service interface for vt plugin state objects.

*

* @since S60 v3.2

*/

class MLcVtStateContext : public MLcVtShutterObserver

    {

    public:

        /**

        * Starts first phase of startup when prepare is received.

        */

        virtual void StartupPhase1L() = 0;

        /**

        * Starts application shutdown.

        */

        virtual void ShutdownL() = 0;

        /**

        * Starts second phase of startup.

        */

        virtual void StartupPhase2L() = 0;

        /**

        * Sets application to foreground and background.            

        * @param aForeground ETrue => foreground, EFalse => background

        */

        virtual void ChangeApplicationFocus( const TBool aForeground ) = 0;

        /**

        * Changes current application state.

        * @param aState new state

        */

        virtual void ChangeState( TLcVtStateBase* aState ) = 0;

        /**

        * Starts DTMF tone.

        * @param aTone DTMF tone.

        */

        //virtual void StartDtmfTone( const TChar& aTone ) = 0;

        /**

        * Stops tarts DTMF tone.

        */

        //virtual void StopDtmfTone() = 0;

        /**

        * Returns model.

        * @return model

        */

        virtual CVtEngModel& Model() = 0;

        /**

        * Returns source containing numbers typed by the user.

        * @return number soure

        */

        virtual TDesC* NumberSource() const = 0;

        /**

        * Executes engine command.

        * @param aCommand command id

        * @param aParams command params

        */

        virtual void DoExecuteCmdL( const TVtEngCommandId aCommand,

                TDesC8* aParams ) = 0;

        /**

        * Refreshes application UI.

        * @param aRefreshFlags identifies what to refresh

        */

        virtual void RefreshL( const TInt aRefreshFlags ) = 0;          

        /**

        * Updates engine states.

        */

        virtual void  RefreshStatesL() = 0;

        /**

        * Handles layout change.

        */

        //virtual void DoHandleLayoutChangedL() = 0;

        /**

        * Sets call id.

        */

        virtual void SetCallIdL( const TInt aCallId ) = 0;

        /**

        * Sets display text of remote end.

        */

        virtual TBool SetCallNameL( const TDesC& aName ) = 0;

        /**

        * Sets call number text of remote end.

        */

        virtual void SetCallNumberL( const TDesC& aNumber ) = 0;

        /**

         * Start shutdown process

         */

        virtual void StartShutdown() = 0;

        /**

        * Refresh flags

        */        

        enum TRefreshFlags

            {

            /** Navipane is refreshed */

            ENaviPane       = 0x01,

            /** Softkeys are refreshed */

            ESoftkeys       = 0x02,

            /** Refreshes blind (video availability) status */

            EBlind          = 0x04,

            /** Refreshes state sync with call handling */

            ESynchronise    = 0x08,

            /** Refreshes internal states (media etc) */

            EUiStates       = 0x10,

            /** Refreshes everything */

            EAll            = ENaviPane | 

                              ESoftkeys | 

                              EBlind | 

                              ESynchronise | 

                              EUiStates

            };

    };

#endif // M_MLCVTSTATECONTEXT_H