// Copyright (c) 1997-2009 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:

//

// Started by BLB, October 1996

#if !defined(__BACNTF_H__)

#define __BACNTF_H__

#include <e32base.h>

class CEnvironmentChangeNotifier : public CActive

/** Environment change notifier. This is an active object and can be used to handle 

environment change events. 

@publishedAll

@released

*/

	{

public:

	IMPORT_C static CEnvironmentChangeNotifier* NewL(TInt aPriority,const TCallBack& aCallBack);

	IMPORT_C ~CEnvironmentChangeNotifier();

	IMPORT_C void Start();

	IMPORT_C TInt Set(const TCallBack& aCallBack);

	inline TInt Change() const;

private:

	inline CEnvironmentChangeNotifier(TInt aPriority);

	void RunL();

	void DoCancel();

private:

	TInt iChange;

	TCallBack iCallBack;

	RChangeNotifier iChangeNotifier;

	};

inline TInt CEnvironmentChangeNotifier::Change() const

	/** Returns the last set of change events.

	If the last outstanding request completed normally, the function returns a 

	bit pattern where each bit value corresponds to one of the enumerators defined 

	by TChanges. A set bit indicates that the corresponding change event occurred.

	For example, if the bit value TChanges::EChangesMidnightCrossover is set, 

	then the system time has passed midnight.

	@return A set of bits consisting of one or more of the values defined by TChanges, 

	or KErrCancel if the last outstanding request was cancelled. 

	@see TChanges */

	{return iChange;}

#endif