1 /*

     2 * Copyright (c) 2007 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:  The base class for interfaces provided by widget classes.

    15 *

    16 */

    17 

    18 

    19 #ifndef I_ALFINTERFACEBASE_H

    20 #define I_ALFINTERFACEBASE_H

    21 

    22 

    23 

    24 namespace Alf

    25     {

    26 

    27 struct IfId;

    28 /**

    29  *  The base class for interfaces provided by

    30  *  widget classes, including CAlfWidget, CAlfModel,

    31  *  CAlfWidgetControl, MAlfWidgetEventHandler,

    32  *  MAlfElement and derived classes.

    33  *

    34  *  @lib alfwidgetmodel.lib

    35  *  @since S60 ?S60_version

    36  *  @status Draft

    37  */

    38 class IAlfInterfaceBase

    39     {

    40 public:

    41     /**

    42      * Default virtual destructor.

    43      */

    44     virtual ~IAlfInterfaceBase() {}

    45 

    46     /**

    47      * Interface getter with casting.

    48      *

    49      * @since S60 ?S60_version

    50      * @param aType The type id of the queried interface.

    51      * @return The queried interface, or NULL if the interface is not

    52      *         supported or available.

    53      */

    54     template <class T>

    55     static T* makeInterface(IAlfInterfaceBase* aBase)

    56         {

    57         return (aBase? static_cast<T*>(aBase->makeInterface(T::type())): 0);

    58         }

    59 

    60 

    61     /**

    62      * Interface getter.

    63      * Derived classes should always call the base class method

    64      * from the overridden MakeInterface.

    65      *

    66      * @since S60 ?S60_version

    67      * @param aType The type id of the queried interface.

    68      * @return The queried interface, or NULL if the interface is not

    69      *         supported or available.

    70      */

    71     virtual IAlfInterfaceBase* makeInterface( const IfId& aType ) = 0;

    72 

    73 

    74     };

    75 

    76     }

    77 

    78 #endif // I_ALFINTERFACEBASE_H

    79 

    80 // End of File