/*

* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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:  Gesture helper helper functions

*

*/

#include "rt_gestureobserver.h"

// system includes

#include <alf/alfcontrol.h>

#include <alf/alflayout.h>

using namespace RT_GestureHelper;

namespace 

    {

    /** @return the leaf-most visual that is under aPos */

    const CAlfVisual* VisualByCoordinates( const CAlfVisual& aRoot, const TPoint& aPos )

        {

        // If it has children, chose any of them is hit first

        const CAlfLayout* layout = dynamic_cast< const CAlfLayout* >( &aRoot );

        if ( layout)

            {

            TInt i = layout->Count();

            while( --i >= 0 )

                {

                if( VisualByCoordinates( layout->Visual( i ), aPos ) )

                    {

                    return &layout->Visual( i );

                    }

                }

            }

        // children were not hit. is this visual hit?

        if( TRect( aRoot.DisplayRect() ).Contains( aPos ) )

            {

            return &aRoot;

            }

        // visual was not found

        return NULL;

        }

    TBool IsRootVisual( const CAlfVisual& aVisual )

        {

        return !aVisual.Layout();

        }

    } // unnamed namespace 

// ----------------------------------------------------------------------------

// VisualByCoordinates

// ----------------------------------------------------------------------------

//

EXPORT_C CAlfVisual* HitTest::VisualByCoordinates( const CAlfControl& aControl, 

        const TPoint& aPos )

    {

    TInt i = aControl.VisualCount();

    while( --i >= 0 )

        {

        // Ask only root visuals, since all children are within the root visuals

        if ( IsRootVisual( aControl.Visual( i ) ) )

            {

            const CAlfVisual* hitVisual = ::VisualByCoordinates( 

                aControl.Visual( i ), aPos );

            if ( hitVisual )

                {

                return const_cast< CAlfVisual* >( hitVisual );

                }

            }

        }

    return NULL;

    }