/*

* 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:  Event manager 

*

*/

#ifndef CVTENGEVENTMANAGER_H

#define CVTENGEVENTMANAGER_H

//  INCLUDES

#include <e32base.h>

#include "VtEngEvents.h"

// FORWARD DECLARATIONS

class MVtEngEventObserver;

// CLASS DECLARATION

/**

*  This class is responsible for notifying client

*  on engine events.

*

*  @lib videoteleng

*  @since 2.6

*/

NONSHARABLE_CLASS( CVtEngEventManager ) : public CActive

    {

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        */

        static CVtEngEventManager* NewL( 

            MVtEngEventObserver& aEventObserver );

        /**

        * Destructor.

        */

        virtual ~CVtEngEventManager();

    public: // New functions

        /**

        * Notifies client on session state change.

        */

        void SessionStateChanged();

        /**

        * Notifies event to observer.

        * @param aEvent event

        */

        static void NotifyEvent( const TInt aEvent );

        void AddObserverL( MVtEngEventObserver* aObserver );

        void RemoveObserver( const MVtEngEventObserver* aObserver );

    private: // from CActive

        void RunL();

        void DoCancel();

    private:

        /**

        * Notifies event to observer

        */

        void DoNotifyEvent( const TInt aEvent );

        TBool QueueAsyncEvent( const TInt aEvent );

        /**

        * Queue event and signal AO.

        * @param aEvent Asynchronous event to be signalled.

        */        

        void QueueAndSignal( const TInt aEvent );

        /**

        * Signals AO.

        */

        void Signal();

    private:

        /**

        * C++ default constructor.

        */

        CVtEngEventManager();

        // 2nd phase constructor

        void ConstructL( MVtEngEventObserver& aEventObserver );

    private:     // Data

        RPointerArray<MVtEngEventObserver> iObservers;

        // Asynchronous events are stored in this array and 

        // executed in order

        CArrayFixFlat< TInt >*  iEventQueue;

    };

#endif      // CVTENGEVENTMANAGER_H

// End of File