1 /*

     2 * Copyright (c) 2008-2009 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:    Provides a simple observable interface.

    15 *

    16 */

    17 

    18 

    19 

    20 

    21 #ifndef M_GLXSIMPLEOBSERVABLE_H

    22 #define M_GLXSIMPLEOBSERVABLE_H

    23 

    24 #include <e32base.h>

    25 #include "glxsimpleobserverevents.h"

    26 

    27 class MGlxSimpleObserver;

    28 

    29 /**

    30  *  MGlxSimpleObservable

    31  *

    32  *  Provides a simple observable interface.

    33  *

    34  *  @lib glxhuiutils.lib

    35  */

    36 class MGlxSimpleObservable

    37     {

    38 public:

    39     /**

    40     * Registers an observer if not previously registered

    41     * @param aObserver The observer concerned

    42     */

    43     virtual void RegisterObserverL( MGlxSimpleObserver* aObserver ) = 0;

    44 

    45     /**

    46     * Deregisters an observer if previously registered

    47     * @param aObserver The observer concerned

    48     */

    49     virtual void DeregisterObserver( MGlxSimpleObserver* aObserver ) = 0;

    50     };

    51     

    52 #endif // M_GLXSIMPLEOBSERVABLE_H