/*

* Copyright (c) 2007-2008 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:  Implementation of CWsfScreenSaverWatcher

*

*/

//  EXTERNAL INCLUDES

#include <e32cmn.h>

#include <ScreensaverInternalPSKeys.h>

//  CLASS HEADER

#include "wsfscreensaverwatcher.h"

//  INTERNAL INCLUDES

#include "wsfscreensaverstateobserver.h"

// ----------------------------------------------------------------------------

// CWsfScreenSaverWatcher::NewL

// ----------------------------------------------------------------------------

//

CWsfScreenSaverWatcher* CWsfScreenSaverWatcher::NewL( 

                                      MWsfScreenSaverStateObserver& aObserver )

    {

    CWsfScreenSaverWatcher* thisPtr = NewLC( aObserver );

    CleanupStack::Pop( thisPtr );

    return thisPtr;

    }

// ----------------------------------------------------------------------------

// CWsfScreenSaverWatcher::NewLC

// ----------------------------------------------------------------------------

//

CWsfScreenSaverWatcher* CWsfScreenSaverWatcher::NewLC( 

                                      MWsfScreenSaverStateObserver& aObserver )

    {

    CWsfScreenSaverWatcher* thisPtr = new ( ELeave ) CWsfScreenSaverWatcher( 

                                                                   aObserver );

    CleanupStack::PushL( thisPtr );

    thisPtr->ConstructL();

    return thisPtr;

    }

// ----------------------------------------------------------------------------

// CWsfScreenSaverWatcher::~CWsfScreenSaverWatcher

// ----------------------------------------------------------------------------

//

CWsfScreenSaverWatcher::~CWsfScreenSaverWatcher()

    {

    Cancel();

    iProperty.Close();

    }

// ----------------------------------------------------------------------------

// CWsfScreenSaverWatcher::CWsfScreenSaverWatcher

// ----------------------------------------------------------------------------

//

CWsfScreenSaverWatcher::CWsfScreenSaverWatcher( 

                                     MWsfScreenSaverStateObserver& aObserver ): 

    CActive( EPriorityStandard ),

    iObserver( &aObserver )

    {

    }

// ----------------------------------------------------------------------------

// CWsfScreenSaverWatcher::ConstructL

// ----------------------------------------------------------------------------

//

void CWsfScreenSaverWatcher::ConstructL()

    {

    User::LeaveIfError( iProperty.Attach( KPSUidScreenSaver, 

                                          KScreenSaverOn ) );

    CActiveScheduler::Add( this );

    }

// ----------------------------------------------------------------------------

// CWsfScreenSaverWatcher::RunL

// ----------------------------------------------------------------------------

//

void CWsfScreenSaverWatcher::RunL()

    {

    // read the value of property

    TBool screenSaverActive( EFalse );

    iProperty.Get( screenSaverActive );

    iObserver->ScreenSaverStatusChangedL( screenSaverActive );

    // reissue the request

    StartStatusScanning();

    }

// ----------------------------------------------------------------------------

// CWsfScreenSaverWatcher::DoCancel

// ----------------------------------------------------------------------------

//

void CWsfScreenSaverWatcher::DoCancel()

    {

    iProperty.Cancel();

    }

// ----------------------------------------------------------------------------

// CWsfScreenSaverWatcher::StartStatusScanning

// ----------------------------------------------------------------------------

//

void CWsfScreenSaverWatcher::StartStatusScanning()

    {

    iProperty.Subscribe( iStatus );

    SetActive();

    }

// ----------------------------------------------------------------------------

// CWsfScreenSaverWatcher::RunError

// ----------------------------------------------------------------------------

//

TInt CWsfScreenSaverWatcher::RunError( TInt /*aError*/ )

    {

    // issue the request so we will continue to receive 

    // state change notifications

    StartStatusScanning();

    return KErrNone;

    }