/*

* Copyright (c) 2004 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:  Internal extension class for Avkon query control

*

*/

#ifndef AKNQUERYEXTENSION_H

#define AKNQUERYEXTENSION_H

// INCLUDES

#include <e32base.h>

// FORWARD DECLARATIONS

class CAknQueryControl;

class CAknsFrameBackgroundControlContext;

// CLASS DECLARATION

/**

* Internal extension class for CAknQueryControl and derived classes.

*

* @since 2.6

*

* @internal

*/

NONSHARABLE_CLASS(CAknQueryExtension) : public CBase

    {

    public: // New methods

        enum TVirtualInputStatus

            {

            EVirtualInputCheckedAlready,

            EVirtualInputEnabled

            };

        /**

        * Creates a new editor control context (with QsnFrInput),

        * but does not initialize rectangles.

        *

        * @since 2.6

        */

        void CreateEditorContextL();

        /**

        * Returns the editor context.

        *

        * @since 2.6

        */

        CAknsFrameBackgroundControlContext* EditorContext();

    private: // New methods (only used by CAknQueryControl)

        /**

        * Retrieves the extension instance.

        * This method is only used internally by CAknQueryControl.

        * Generally, @c CAknQueryControl::QueryExtension should be used to 

        * access the instance.

        */

        static CAknQueryExtension* Instance(

            const CAknQueryControl* aQueryControl );

    private: // Construction and destruction (only used by CAknQueryControl)

        /**

        * Creates the extension.

        */

        static void CreateExtensionL(

            const CAknQueryControl* aQueryControl );

        /**

        * Destroyes the extension.

        */

        static void DestroyExtension(

            const CAknQueryControl* aQueryControl );

        /**

        * Static constructor.

        */

        static CAknQueryExtension* NewL();

        /**

        * Destructor.

        */

        virtual ~CAknQueryExtension();

    private: // Data

        CAknsFrameBackgroundControlContext* iEditorContext;

        TBool iAllowEmptyInput;

        TBitFlags iVirtualInputStatusFlags;

    private: // Friend classes

        friend class CAknQueryControl;

        friend class CAknMultilineQueryControl;

    };

#endif      // AKNQUERYEXTENSION_H

// End of File