/*

* 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:  Widget interface with utilities for scrollbar widget.

 *

*/

#ifndef ALF_SCROLLEVENTS_H

#define ALF_SCROLLEVENTS_H

// WidgetModel Includes

#include <alf/alfwidgetevents.h>

// Widget Includes

#include <alf/ialfscrollbarwidget.h>

#include <alf/ialfscrollbardefaultbaseelement.h>

namespace Alf

    {

    // forward declaration

    class IAlfScrollBarDefaultBaseElement;    

    /**

     *  Flags to indicate the changes being done in the scrollbar model

     *  ENoChange Flag to indicate no scrollbar model data is changed 

     *  ESpanChanged Flag to indicate Span is changed

     *  EViewLengthChanged Flag to indicate view length is changed

     *  EViewStartPosChanged Flag to indicate view start position is changed

     *  EFocusPosChanged Flag to indicate focus position is changed

     *

     *  @since S60 ?S60_version

     */

    enum ScrollModelChangeMask

        {

        ENoChange             = 0, // Flag if scrollbar model data is changed

        ESpanChanged          = 1, // Flag to indicate Span is changed 

        EViewLengthChanged    = 2, // Flag to indicate view length is changed

        EViewStartPosChanged  = 4, // Flag if view start position is changed 

        };

    /**

     *  This structure is used to send data along with 

     * EEventScrollModelChanged scroll event

     *

     *  @since S60 ?S60_version

     */

    struct ScrollModelChangedEventData

        {

        int mSpan;          // Span 

        int mViewLength;    // View Length 

        int mViewStartPos;  // View Start position 

        int mChangedMask;   // combination (ORing) of one or more 

                            // TScrollModelChangeMask enums

        };

    } // namespace Alf

#endif // IALF_SCROLLEVENTS_H

//End Of File