/*

* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

* Contains functionality for a callback timer

*

*/

/**

 @file

 @internalTechnology

 @released

*/

#ifndef __CALLBACKTIMER_H__

#define __CALLBACKTIMER_H__

#include <e32base.h>

/**

 * Interface class for using the services of CCallbackTimer

 */

class MTimerObserver

	{

public:

	virtual ~MTimerObserver() {};

	/**

	 * Call back function to handle the expiry of the timer

	 * @param aError	KErrNone if timer expired normally else any of the system-wide error codes to indicate a system error

	 */

	virtual void TimerRun(TInt aError) = 0;

	};

/**

 * A timer class that provides a call back on timer expiry

 */

class CCallbackTimer : public CTimer

	{

	public:

	/**

	 * Create and return a new instance of the CCallbackTimer. An ongoing timer operation can be cancelled by the client by calling the Cancel() method on this object.

	 * @param aCallBackIf			Callback interface that implements TimerRun() function

	 * @param aEnableCancelCallback	If ETrue cancel events (client initiated by calling Cancel() method) are notified. Default is EFalse

	 */

	IMPORT_C static CCallbackTimer* NewL(MTimerObserver& aCallBackIf, TBool aEnableCancelCallback = EFalse);

private:

	CCallbackTimer(MTimerObserver& aCallBackIf, TBool aEnableCancelCallback);

	// Methods from CTimer/CActive

	void RunL();

private:

	MTimerObserver& iCallBackIf;

	TBool iEnableCancelCallback;

	};

#endif // __CALLBACKTIMER_H__