1 /*

     2 * Copyright (c) 2008 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:  Video Source subsystem.

    15 *

    16 */

    17 

    18 

    19 #ifndef C_ACTIVEWAIT_H

    20 #define C_ACTIVEWAIT_H

    21 

    22 // INCLUDE FILES

    23 #include <e32base.h>

    24 #include <e32svr.h>

    25 /**

    26 *  Active waiter class for waiting any active request. When asynchronous

    27 *  request has been completed a given callback method will be called.

    28 *

    29 *  @lib videosource.lib

    30 */

    31 template < class R > class CVSActiveWait: public CActive

    32     {

    33     private :

    34     

    35   			typedef void ( R::*TVSActiveWaitCallback) ( TInt );  		

    36     

    37     public : // Constructors and destructor

    38 

    39         /**

    40         * Constructor.

    41         * @param "aRequester" ?description

    42         */

    43         inline CVSActiveWait( R* aRequester );

    44 

    45         /**

    46         * Destructor.

    47         */

    48         inline ~CVSActiveWait();

    49 

    50         /**

    51         * Initializes the waiter class.

    52         * @param "aCallback" Pointer to callback method that will be called

    53         * when asynchronous request has been completed.

    54         */

    55         inline void InitializeWaiter( TVSActiveWaitCallback aCallback );

    56 

    57         /**

    58         * Returns pointer to this active object's TRequestStatus member

    59         * (iStatus).

    60         * @return Pointer to this classes TRequestStatus member (iStatus).

    61         */

    62         inline TRequestStatus* RequestStatus();

    63 

    64         /**

    65         * Signals waiter with given error code.

    66         * @param aError Integer error code.

    67         */

    68         inline void Signal( TInt aError );

    69 

    70     private :    // Functions from base classes

    71 

    72         /**

    73         * From CActive. See CActive for description.

    74         */

    75         inline void RunL();

    76 

    77         /**

    78         * From CActive. See CActive for description.

    79         */

    80         inline void DoCancel();

    81 

    82     private :    // Data

    83 

    84         // Pointer to requester. Callback method call will be made in this

    85         // context.

    86         R* iRequester; // not owned

    87 

    88         // Pointer to callback method.

    89         TVSActiveWaitCallback iCallback;

    90     };

    91 

    92 #include "cactivewait.inl"

    93     

    94 #endif      // C_ACTIVEWAIT_H

    95