/*

* Copyright (c) 2007 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:  Watches USB states

*

*/

#ifndef CUSBSTATEWATCHER_H

#define CUSBSTATEWATCHER_H

#include <e32std.h>

#include <d32usbc.h>

#include "cusbdevcon.h"

/**

 *  Usb State watcher

 *  Reports Usb state changes to CUsbDevCon

 *

 *  @lib usbdevcon.lib

 *  @since S60 v.5.0 

 */

class CUsbStateWatcher : public CActive

    {

public:

    /**

     * Two-phased constructor.

     *

     * @since S60 v.5.0

     * @param aObserver Gets notifications when USB state changed

     * @param aLdd Link to LDD services

     * @return Constructed instance

     */ 

    static CUsbStateWatcher* NewL(CUsbDevCon& aObserver, RDevUsbcClient& aLdd);

    /**

    * Destructor.

    *

    * @since S60 v.5.0

    */

    virtual ~CUsbStateWatcher();

    /**

     * Activates USB states watching

     *

     * @since S60 v.5.0

     */

    void Activate();

private:

    /**

     * Default construction

     *

     * @since S60 v.5.0

     * @param aObserver Gets notifications when USB state changed

     * @param aLdd Link to LDD services

     */

    CUsbStateWatcher(CUsbDevCon& aObserver, RDevUsbcClient& aLdd);

    /**

     * Two-phased constructor.

     *

     * @since S60 v.5.0

     */

    void ConstructL();

    // from CActive

    /**

     * From CActive.

     *

     */

    void RunL();

    /**

     * From CActive.

     *

     */ 

    void DoCancel();

     /**

     * From CActive.

     *

     */ 

     TInt RunError( TInt /*aError*/ );

private: // data

    /**

     * Device state

     */

    TUint iState;

    /**

     * Observer

     * Not own.  

     */

    CUsbDevCon& iObserver;

    /**

     * LDD

     * Not own.  

     */

    RDevUsbcClient& iLdd;

    };

#endif // CUSBSTATEWATCHER_H