1 /*

     2 * Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies). 

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:  Implementation of CWsfScreenSaverWatcher

    15 *

    16 */

    17 

    18 

    19 //  EXTERNAL INCLUDES

    20 #include <e32cmn.h>

    21 #include <ScreensaverInternalPSKeys.h>

    22 

    23 //  CLASS HEADER

    24 #include "wsfscreensaverwatcher.h"

    25 

    26 //  INTERNAL INCLUDES

    27 #include "wsfscreensaverstateobserver.h"

    28 

    29 

    30 

    31 // ----------------------------------------------------------------------------

    32 // CWsfScreenSaverWatcher::NewL

    33 // ----------------------------------------------------------------------------

    34 //

    35 CWsfScreenSaverWatcher* CWsfScreenSaverWatcher::NewL( 

    36                                       MWsfScreenSaverStateObserver& aObserver )

    37     {

    38     CWsfScreenSaverWatcher* thisPtr = NewLC( aObserver );

    39     CleanupStack::Pop( thisPtr );

    40     return thisPtr;

    41     }

    42 

    43 

    44 // ----------------------------------------------------------------------------

    45 // CWsfScreenSaverWatcher::NewLC

    46 // ----------------------------------------------------------------------------

    47 //

    48 CWsfScreenSaverWatcher* CWsfScreenSaverWatcher::NewLC( 

    49                                       MWsfScreenSaverStateObserver& aObserver )

    50     {

    51     CWsfScreenSaverWatcher* thisPtr = new ( ELeave ) CWsfScreenSaverWatcher( 

    52                                                                    aObserver );

    53     CleanupStack::PushL( thisPtr );

    54     thisPtr->ConstructL();

    55     return thisPtr;

    56     }

    57 

    58 

    59 // ----------------------------------------------------------------------------

    60 // CWsfScreenSaverWatcher::~CWsfScreenSaverWatcher

    61 // ----------------------------------------------------------------------------

    62 //

    63 CWsfScreenSaverWatcher::~CWsfScreenSaverWatcher()

    64     {

    65     Cancel();

    66     iProperty.Close();

    67     }

    68 

    69 

    70 // ----------------------------------------------------------------------------

    71 // CWsfScreenSaverWatcher::CWsfScreenSaverWatcher

    72 // ----------------------------------------------------------------------------

    73 //

    74 CWsfScreenSaverWatcher::CWsfScreenSaverWatcher( 

    75                                      MWsfScreenSaverStateObserver& aObserver ): 

    76     CActive( EPriorityStandard ),

    77     iObserver( &aObserver )

    78     {

    79     }

    80 

    81 

    82 // ----------------------------------------------------------------------------

    83 // CWsfScreenSaverWatcher::ConstructL

    84 // ----------------------------------------------------------------------------

    85 //

    86 void CWsfScreenSaverWatcher::ConstructL()

    87     {

    88     User::LeaveIfError( iProperty.Attach( KPSUidScreenSaver, 

    89                                           KScreenSaverOn ) );

    90     CActiveScheduler::Add( this );

    91     }

    92 

    93 

    94 // ----------------------------------------------------------------------------

    95 // CWsfScreenSaverWatcher::RunL

    96 // ----------------------------------------------------------------------------

    97 //

    98 void CWsfScreenSaverWatcher::RunL()

    99     {

   100     // read the value of property

   101     TBool screenSaverActive( EFalse );

   102     iProperty.Get( screenSaverActive );

   103     iObserver->ScreenSaverStatusChangedL( screenSaverActive );

   104     // reissue the request

   105     StartStatusScanning();

   106     }

   107 

   108 

   109 // ----------------------------------------------------------------------------

   110 // CWsfScreenSaverWatcher::DoCancel

   111 // ----------------------------------------------------------------------------

   112 //

   113 void CWsfScreenSaverWatcher::DoCancel()

   114     {

   115     iProperty.Cancel();

   116     }

   117 

   118 

   119 // ----------------------------------------------------------------------------

   120 // CWsfScreenSaverWatcher::StartStatusScanning

   121 // ----------------------------------------------------------------------------

   122 //

   123 void CWsfScreenSaverWatcher::StartStatusScanning()

   124     {

   125     iProperty.Subscribe( iStatus );

   126     SetActive();

   127     }

   128 

   129 

   130 // ----------------------------------------------------------------------------

   131 // CWsfScreenSaverWatcher::RunError

   132 // ----------------------------------------------------------------------------

   133 //

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

   135     {

   136     // issue the request so we will continue to receive 

   137     // state change notifications

   138     StartStatusScanning();

   139     return KErrNone;

   140     }