/*+
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* Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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* This component and the accompanying materials are made available+
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* under the terms of "Eclipse Public License v1.0"+
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* which accompanies this distribution, and is available+
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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*+
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* Initial Contributors:+
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* Nokia Corporation - initial contribution.+
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*+
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* Contributors:+
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*+
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* Description: +
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*+
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*/+
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+
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/**+
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 * @file +
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 *+
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 * @internalComponent+
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 * @prototype+
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 */+
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+
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#ifndef __DRIVEWATCHER_H__+
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#define __DRIVEWATCHER_H__+
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+
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#include <e32base.h>+
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#include <f32file.h>+
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+
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namespace Swi+
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{+
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+
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/**+
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 * Observer interface called whenever a media change is detected.+
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 */+
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class MDriveObserver+
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	{+
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public:+
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	/// Enumeration indicating whether a card was inserted or removed+
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	enum TChangeType { EMediaInserted, EMediaRemoved };+
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	+
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	/**+
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	 * This function is called to indicate a media change has occurred.+
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	 *+
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	 * @param aChangeType	EInserted to indicate media has been inserted,+
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	 *						or ERemoved to indicate media has been removed.+
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	 */+
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	virtual void MediaChangeL(TInt aDrive, TChangeType aChangeType)=0;+
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	};+
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+
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/**+
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 * This active object waits for an indication that the media has changed,+
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 * and then notifies its observer.+
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 */+
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class CDriveWatcher : public CActive+
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	{+
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public:+
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	static CDriveWatcher* NewL(RFs& aFs, TInt aDrive, MDriveObserver& aObserver,TInt aPriority = EPriorityStandard);+
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	static CDriveWatcher* NewLC(RFs& aFs, TInt aDrive, MDriveObserver& aObserver,TInt aPriority = EPriorityStandard);+
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	+
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	~CDriveWatcher();+
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+
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	TInt Drive() const;+
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private:+
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	CDriveWatcher(RFs& aFs, TInt aDrive, MDriveObserver& aObserver, TInt aPriority);+
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+
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	void ConstructL();+
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+
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// from CActive+
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	void DoCancel();+
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	void RunL();+
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+
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	/// Set up change notification.+
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	void WaitForChangeL();+
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+
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	/**+
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	 * Notifies the observer of the appropriate media change depending on whether+
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	 * media is now present on the drive we're currently watching.+
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	 */+
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	void NotifyMediaChange();+
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	+
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	/** +
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	 * Determines if the media is present in the drive we are currently watching.+
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	 *+
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	 * @return ETrue if the media is present, EFalse otherwise.+
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	 */+
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	TBool IsMediaPresentL();+
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+
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private:+
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	/// Not owned by this class+
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	RFs& iFs;+
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	+
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	/// Drive number we are watching+
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	TInt iDrive;+
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+
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	/// Observer to notify of changes+
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	MDriveObserver& iObserver;  +
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	};+
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+
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// inline functions from CDriveWatcher+
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+
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inline TInt CDriveWatcher::Drive() const+
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	{+
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	return iDrive;+
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	}+
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	+
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} //namespace Swi+
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+
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#endif // #ifndef __DRIVEWATCHER_H__+
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+
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