/*

* Copyright (c) 2009 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: This file contains the header file of the CCallBack 

* class.

*

*/

#ifndef CALLBACK_H

#define CALLBACK_H

//  INCLUDES

#include <e32base.h>

// CONSTANTS

// None

// MACROS

// None

// DATA TYPES

// None

// FUNCTION PROTOTYPES

// None

// FORWARD DECLARATIONS

// None

// CLASS DECLARATION

// DESCRIPTION

// Simple class for callbacks.

class CCallBack 

    :public CAsyncCallBack

    {

    public: // Enumerations

    private: // Enumerations

    public:  // Constructors and destructor

        /**

        * C++ constructor.

        */

        CCallBack( TInt aPriority ):CAsyncCallBack( aPriority ) {}

        /**

        * C++ constructor.

        */

        CCallBack( TCallBack& aCallBack, TInt aPriority ):

            CAsyncCallBack( aCallBack, aPriority ) {}

    public: // New functions

        /**

        * Return reference to TRequestStatus member.

        */

        TRequestStatus& Status(){ return iStatus; }

        /**

        * Set CCallBack active.

        */

        void SetActive()

            { 

            iStatus = KRequestPending; 

            CActive::SetActive(); 

            };

    public: // Functions from base classes

        /**

        *

        */

        void RunL(){ iCallBack.CallBack(); }

    protected:  // New functions

    protected:  // Functions from base classes

    private:

	public:     // Data

	protected:  // Data

    private:    // Data

    public:     // Friend classes

    protected:  // Friend classes

    private:    // Friend classes

    };

template <class T>

class CActiveCallback 

        :public CActive

    {

    public: // Enumerations

        /**

        * Callback function type definitions

        */

       typedef void (T::* TestFunction)();    

    private: // Enumerations

    public:  // Constructors and destructor

        /**

        * C++ constructor.

        */

        CActiveCallback ( T* aClass, TestFunction aFunction ) : CActive (EPriorityStandard)

            {

            iMethod = aFunction;

            iClass = aClass;

            iCompleted = EFalse;

            }

    public: // New functions

        /**

        * Return reference to TRequestStatus member.

        */

        TRequestStatus& Status(){ return iStatus; }

        /**

        * Set active object to active and return reference to TRequestStatus member

        */

        TRequestStatus& Activate()

            {        

            iCompleted = EFalse;

            SetActive();

            return iStatus;

            }

        /**

        * Is callback completed?

        */

        TBool isCompleted()

            {

            return iCompleted;

            }

    public: // Functions from base classes

        /**

        * Call the callback

        */

        void RunL()

            {

            iCompleted = ETrue;

            if ( iMethod != NULL )

                {

                (iClass->*iMethod) ();

                }        

            }

        /**

        * Just forward errors to framework

        */

        TInt RunError ( TInt aError )

            {

            return aError;

            }

        /**

        * Cancel is not supported.

        */

        void DoCancel ()

            {  

            }

    protected:  // New functions

    protected:  // Functions from base classes

    private:

	public:     // Data

	protected:  // Data

    private:    // Data

        TestFunction iMethod;           // Pointer to method to be called

        T* iClass;                      // Pointer to calls to be called

        TBool iCompleted;               // Is callback completed?

    public:     // Friend classes

    protected:  // Friend classes

    private:    // Friend classes

    };

#endif      // CALLBACK_H  

// End of File