1 /*

     2 * Copyright (c) 2002 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:  Publish & Subscribe property change observer

    15 *

    16 */

    17 

    18 

    19 

    20 #ifndef VMDETDLGPROPERTYOBSERVER_H

    21 #define VMDETDLGPROPERTYOBSERVER_H

    22 

    23 //  INCLUDES

    24 #include <e32base.h>        // CActive

    25 #include <e32property.h>    // RProperty

    26 

    27 // FORWARD DECLARATIONS

    28 class CVmDetailsDialog;

    29 

    30 // CLASS DECLARATION

    31 

    32 /**

    33 *  Implementation of the Publish & Subscribe property change observer

    34 *

    35 *  @lib

    36 *  @since 2.6

    37 */

    38 class CVmDetDlgPropertyObserver : public CActive

    39     {

    40     public:  // Constructors and destructor

    41 

    42         /**

    43         * Two-phased constructor.

    44         * @param aObserver Observer to be informed when observed property

    45         *                  changes

    46         */

    47         static CVmDetDlgPropertyObserver* NewL( CVmDetailsDialog& aDetDialog );

    48 

    49         /**

    50         * Destructor.

    51         */

    52         virtual ~CVmDetDlgPropertyObserver();

    53 

    54     public:     // New functions

    55 

    56         /**

    57         * Starts observing the given key for any changes

    58         * Notifies the observer when the property changes

    59         * @since 2.6

    60         * @param aCategory, Category of the observed property

    61         * @param aKey, Observed property

    62         */

    63         void ObservePropertyChangeL( TUid aCategory, TUint aKey );

    64 

    65     protected:  // Functions from base classes

    66 

    67         /**

    68         * From CActive

    69         */

    70         void RunL();

    71 

    72         /**

    73         * From CActive

    74         */

    75         void DoCancel();

    76 

    77         /**

    78         * From CActive

    79         */

    80         TInt RunError( TInt aError );

    81 

    82     private:

    83 

    84         /**

    85         * C++ default constructor.

    86         */

    87         CVmDetDlgPropertyObserver( CVmDetailsDialog& aDetDialog );

    88 

    89         /**

    90         * Symbian 2nd phase constructor..

    91         */

    92         void ConstructL();

    93 

    94     private:    // Data

    95 

    96         // Owns: Observed property

    97         RProperty iProperty;

    98 

    99         // Observer to be informed when property changes

   100         CVmDetailsDialog& iDetDialog;

   101         

   102         // Observed property

   103         TUint iKey;

   104     };

   105 

   106 #endif      // VMDETDLGPROPERTYOBSERVER_H

   107 

   108 // End of File