1 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

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

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 /**

    17  @file

    18  @internalTechnology 

    19 */

    20 

    21 

    22 #ifndef PSPOPERTYOBSERVER_H

    23 #define PSPOPERTYOBSERVER_H

    24 

    25 #include <e32base.h>

    26 #include <e32property.h>

    27 

    28 

    29 /**

    30 * Callback interface for property change notification.

    31 */

    32 class MPsPropertyObserver

    33     {

    34 public:

    35     /**

    36     * Notifies changes in the property value

    37     *

    38     * @param aKey key for which value changed.

    39     * @param aValue new value.

    40     * @param aError KErrNone if successful. otherwise on of system-wide error.

    41     */

    42     virtual void PsPropertyChanged(TInt aKey, TInt aValue, TInt aError) =0;

    43     };

    44 

    45 /**

    46 *  This class observes changes in PS-Property value.

    47 *

    48 */

    49 NONSHARABLE_CLASS(CPsPropertyObserver) : public CActive

    50     {

    51 public:

    52     IMPORT_C static CPsPropertyObserver* NewL(const TUid& aGroup, TInt aKey, MPsPropertyObserver& aObserver);

    53     IMPORT_C static TInt Get(const TUid& aGroup, TInt aKey, TInt& value);

    54     IMPORT_C TInt Get(TInt& value);

    55     void Start();

    56     ~CPsPropertyObserver();

    57         

    58 private:

    59     CPsPropertyObserver(TUid aGroup, TInt aKey, MPsPropertyObserver& aObserver);

    60     void ConstructL(const TUid& aGroup);

    61     

    62 protected:

    63     void RunL();

    64     void DoCancel();

    65     

    66 private:

    67     RProperty iProperty;

    68     TUid iGroup;

    69     TInt iKey;

    70     TInt iValue;

    71     MPsPropertyObserver& iObserver;

    72     };

    73 

    74 #endif