1 /*

     2 * Copyright (c) 2002-2006 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:  Interface for Publish and suscripe change notifier.

    15 *

    16 */

    17 

    18 

    19 

    20 #ifndef MSATSYSTEMSTATECHANGENOTIFIER_H

    21 #define MSATSYSTEMSTATECHANGENOTIFIER_H

    22 

    23 //  INCLUDES

    24 #include <e32std.h>

    25 

    26 // CONSTANTS

    27 // Indicates that the observer doesn't want to specify any value, when it should

    28 // be notified. In this case, the changed value is sent to observer

    29 const TInt KNotifyValueNotSet = -1;

    30 

    31 // CLASS DECLARATION

    32 

    33 /**

    34 *  Change notifier for Publish & Subscribe.

    35 *

    36 *  @lib SatSystemState

    37 *  @since Series 60 3.0

    38 */

    39 class MSatSystemStateChangeNotifier

    40     {

    41     public:  // Constructors and destructor

    42 

    43         /**

    44         * Destructor.

    45         */

    46         virtual ~MSatSystemStateChangeNotifier() {};

    47 

    48     public: // New functions

    49 

    50         /**

    51         * Request a notification of a change in system state.

    52         * The request is standing as long as it is canceled.

    53         */

    54         virtual void NotifyChangeL() = 0;

    55 

    56         /**

    57         * Cancels the notification request.

    58         */

    59         virtual void CancelNotify() = 0;

    60         

    61         /**

    62         * Gets the current value.

    63         * @return Current value for earlier request.

    64         */

    65         virtual TInt GetValueInt() { return KNotifyValueNotSet; };

    66 

    67     protected:  // New functions

    68 

    69         /**

    70         * C++ default constructor.

    71         */

    72         MSatSystemStateChangeNotifier() {};

    73 

    74     private:

    75 

    76         // Prohibit copy constructor if not deriving from CBase.

    77         MSatSystemStateChangeNotifier( const MSatSystemStateChangeNotifier& );

    78 

    79         // Prohibit assigment operator if not deriving from CBase.

    80         MSatSystemStateChangeNotifier& operator=( const MSatSystemStateChangeNotifier& );

    81 

    82     };

    83 

    84 #endif      // MSATSYSTEMSTATECHANGENOTIFIER_H

    85 

    86 // End of File