/*

* 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:  Usb observer definition for fmtx watcher plugin.

*

*/

#ifndef HWRMFMTXUSBOBSERVER_H

#define HWRMFMTXUSBOBSERVER_H

#include <usbman.h>

#include "hwrmfmtxwatcherplugin.h"

#include "hwrmfmtxconnobserver.h"

/**

* Active object for obtaining notification of changes in USB connections.

*

* @since S60 3.2

* @lib hwrmfmtxwatcherplugin.lib

*/

NONSHARABLE_CLASS(CHWRMFmtxUsbObserver) : public CActive, 

                                  public MHWRMFmtxConnObserver

	{

public:

    /**

    * This is a two-phase constructor method that is used to create a new

    * instance for listening to the changes in USB connections.

    *

    * @param aObserver A reference to an observer instance.

    * @return A pointer to a new instance of the CHWRMFmtxUsbObserver class.

    *

	* @leave One of the Symbian OS error codes.

    */

    static CHWRMFmtxUsbObserver* NewL( MHWRMFmtxConnObserverCallback& aObserver );

    /**

    * Destructor.

    */

    ~CHWRMFmtxUsbObserver();

    // From MHWRMFmtxConnObserver

    TBool GetStatusL();

	void StartObservingL();

	void StopObserving();

private:

    /**

    * Constructor.

    *

    * @param aObserver A reference to an observer instance.

    */

    CHWRMFmtxUsbObserver( MHWRMFmtxConnObserverCallback& aObserver );

    /**

    * By default Symbian OS constructor is private.

    */

    void ConstructL();

    /**

    * Orders USB notification.

    */

    void OrderUsbNotification();

protected:

    // from CActive

    void RunL();

    void DoCancel();

private:

    /**

    * Handle to usbman.

    */    

	RUsb iUsbMan;

    /**

    * Storage for USB device state.

    * Updated upon completion of USB notification.

    */

    TUsbDeviceState iDeviceState;

    /**

    * Response callback pointer.

    */    

    MHWRMFmtxConnObserverCallback& iCallback;

    /**

    * Stores USB connection status, ETrue if connected.

    * Used for filtering out excess USB configuration change notifications.

    */    

    TBool iConnected;

	};

#endif      // HWRMFMTXUSBOBSERVER_H

// End of File