/*

* Copyright (c) 2007-2009 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: This file defines class CESMRFieldEventQueue.

*

*/

#ifndef CESMRFIELDEVENTQUEUE_H

#define CESMRFIELDEVENTQUEUE_H

#include <e32base.h>

#include "mesmrfieldeventqueue.h"

/**

 *  CESMRFieldEventQueue defines an field event queue for ESMR GUI.

 *

 *  @code

 *   

 *  @endcode

 *

 *  @lib esmrgui.lib

 */

NONSHARABLE_CLASS( CESMRFieldEventQueue ) : public CBase,

                                            public MESMRFieldEventQueue

    {

public:

    static CESMRFieldEventQueue* NewL();

    static CESMRFieldEventQueue* NewLC();

    /**

     * Destructor.

     */

    virtual ~CESMRFieldEventQueue();

// from base class MESMRFieldEventQueue

    /**

     * From MESMRFieldEventQueue.

     * Adds observer to the event queue.

     *

     * @param aObserver the observer.

     */

    void AddObserverL( MESMRFieldEventObserver* aObserver );

    /**

     * From MESMRFieldEventQueue.

     * Removes observer from the event queue.

     *

     * @param aObserver the observer.

     */

    void RemoveObserver( MESMRFieldEventObserver* aObserver );

    /**

     * From MESMRFieldEventQueue.

     * Notifies event to the event observers in the queue.

     * Event is notified synchronously.

     * 

     * @param aEvent the event.

     */

    void NotifyEventL( const MESMRFieldEvent& aEvent );

    /**

     * From MESMRFieldEventQueue.

     * Enques event to event queue and notifies it asynchronously to

     * the observers. Ownership of the event is transferred to the queue.

     * 

     * @param aEvent the event to enque to the event queue.

     */

    void NotifyEventAsyncL( MESMRFieldEvent* aEvent );

    /**

     * From MESMRFieldEventQueue.

     * Removes event from the event queue.

     * 

     * @param aEvent the event to remove from the event queue.

     */

    void CancelEvent( MESMRFieldEvent* aEvent );

private:

    CESMRFieldEventQueue();

    void ConstructL();

    static TInt NotifyCallBack( TAny* aPtr );

    void DoNotifyEventAsyncL();

    TBool HasEvents() const;

    void Start();

private: // data

    /**

     * Observer array

     */

    RPointerArray< MESMRFieldEventObserver > iObservers;

    /**

     * Event queue

     */

    RPointerArray< MESMRFieldEvent > iEventQueue;

    /**

     * Current observer index

     */

    TInt iNotifyIndex;

    /**

     * Idle callback. Own.

     */

    CIdle* iIdle;

    };

#endif // CESMRFIELDEVENTQUEUE_H