/*

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

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

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

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Command validator callback class definition.

*

*/

#ifndef T_VTUICMDVALIDATORCALLBACK_H

#define T_VTUICMDVALIDATORCALLBACK_H

#include <e32base.h>

/**

 *  MVtUiCmdValidatorCallBack

 *

 *  Command validator callback API.

 *

 *  @since S60 v3.2

 */

class MVtUiCmdValidatorCallBack

    {

public:

    /**

     * Invokes callback call.

     */

    virtual TBool Call( TInt ) const = 0;

    };

/**

 *  TVtUiCmdValidatorCallBack

 *

 *  Validator callback wrapper to maintain type safety. Also allows use of

 *  different types of instances for invocation of callback.

 *

 *  @since S60 v3.2

 */

template < class T >

NONSHARABLE_CLASS( TVtUiCmdValidatorCallBack )

: public MVtUiCmdValidatorCallBack

    {

    // Callback method type definition

    typedef TBool ( T::*TCallBackMethod )( TInt ) const;

public:

    /**

     * Constructor

     *

     * @param aInstance Instance on which callback method will be called.

     * @param aMethod Callback method to be called.

     */

    TVtUiCmdValidatorCallBack( const T& aInstance, TCallBackMethod aMethod );

    /**

     * Executes callback.

     *

     * @param aParameter Callback parameter, e.g. command Id or resource Id.

     * @return Callback result.

     */

    TBool Call( TInt aParameter ) const;

private:

    // Instance from which callback method will be invoke

    const T* iInstance;

    // Callback method pointer

    TCallBackMethod iMethod;

    };

#include "tvtuicmdvalidatorcallback.inl"

#endif // T_VTUICMDVALIDATORCALLBACK_H