// Copyright (c) 2005-2009 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 "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

// which accompanies this distribution, and is available

// at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

#ifndef __CALPROGRESSCALLBACK_H__

#define __CALPROGRESSCALLBACK_H__

class MCalProgressCallBack

/** A call back class to show the progress of long-running operations. 

When a long-running operation is carried out on the instance view or the entry 

view, this class is used to signal its progress, and when the function is complete.

@publishedAll

@released

*/

	{

public:

	/** Progress callback.

	This calls the observing class with the percentage complete of the current operation.

	@param aPercentageCompleted The percentage complete. */

	virtual void Progress(TInt aPercentageCompleted) = 0;

	/** Progress callback.

	This calls the observing class when the current operation is finished.

	@param aError The error if the operation failed, or KErrNone if successful. */

	virtual void Completed(TInt aError) = 0;

	/** 

    Asks the observing class whether progress callbacks are required. This

    is called once only to check if callbacks are enabled.

	@return If the observing class returns EFalse, then the Progress() function will not be called. 

    */

	virtual TBool NotifyProgress() = 0;

	};

#endif // __CALPROGRESSCALLBACK_H__