/*

* Copyright (c) 2008 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:  

*

*/

#ifndef CMCSFREESPACEOBSERVER_H

#define CMCSFREESPACEOBSERVER_H

#include <e32base.h>	// For CActive, link against: euser.lib

#include <f32file.h>

/**

 * Interface for monitoring free space.

 *

 * @since S60 v5.0

 */

class MMcsFreeSpaceObserver

	{

public:

    /**

     * Handles free space threshold events.

     * It must be implemented in derived clesses.

     */

	virtual void HandleFreeSpaceEventL() = 0;

    static const TInt64 EFreeDiskSpace = 40*1024;

	};

/**

 *  Free space Observer Interface.

 *  @lib mcsmenu.lib

 *  @since S60 v5.0

 */

NONSHARABLE_CLASS(CMcsFreeSpaceObserver) : public CActive

	{

public:

	// Cancel and destroy

	~CMcsFreeSpaceObserver();

	// Two-phased constructor.

	static CMcsFreeSpaceObserver* NewL(MMcsFreeSpaceObserver& aCallback,

	    TInt64 aFreeDiskSpace = MMcsFreeSpaceObserver::EFreeDiskSpace,

	    TInt aDrive=EDriveC);

	// Two-phased constructor.

	static CMcsFreeSpaceObserver* NewLC(MMcsFreeSpaceObserver& aCallback,

	    TInt64 aFreeDiskSpace = MMcsFreeSpaceObserver::EFreeDiskSpace,

	    TInt aDrive = EDriveC);

private:

	// C++ constructor

    CMcsFreeSpaceObserver(MMcsFreeSpaceObserver& aCallback,

        TInt64 aFreeDiskSpace,

        TInt aDrive);

	// Second-phase constructor

	void ConstructL();

private:

	// From CActive

	// Handle completion

	void RunL();

	void DoCancel();

	TInt RunError(TInt aError);

private:

    /*

     * Observed drive.

     */

    TInt iDrive;

    /*

     * Free space threshold (bytes).

     */

    TInt64 iFreeDiskSpace;

    /*

     * A handle to a file server session.

     */

	RFs iFs;

	/*

	 * An object of a class implementing callback

	 * function (HandleFreeSpaceEventL)

	 * of MMcsFreeSpaceObserver interface.

	 */

	MMcsFreeSpaceObserver& iCallback;

	};

#endif // CMCSFREESPACEOBSERVER_H