mulwidgets/gesturehelper/src/hittest.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 08:56:02 +0200
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/*
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* Copyright (c) 2008-2008 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Gesture helper helper functions
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*
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*/
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#include "gestureobserver.h"
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// system includes
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#include <alf/alfcontrol.h>
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#include <alf/alflayout.h>
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using namespace GestureHelper;
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namespace 
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    {
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    /** @return the leaf-most visual that is under aPos */
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    const CAlfVisual* VisualByCoordinates( const CAlfVisual& aRoot, const TPoint& aPos )
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        {
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        // If it has children, chose any of them is hit first
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        const CAlfLayout* layout = dynamic_cast< const CAlfLayout* >( &aRoot );
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        if ( layout)
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            {
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            TInt i = layout->Count();
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            while( --i >= 0 )
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                {
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                if( VisualByCoordinates( layout->Visual( i ), aPos ) )
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                    {
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                    return &layout->Visual( i );
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                    }
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                }
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            }
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        // children were not hit. is this visual hit?
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        if( TRect( aRoot.DisplayRect() ).Contains( aPos ) )
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            {
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            return &aRoot;
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            }
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        // visual was not found
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        return NULL;
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        }
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    TBool IsRootVisual( const CAlfVisual& aVisual )
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        {
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        return !aVisual.Layout();
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        }
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    } // unnamed namespace 
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// ----------------------------------------------------------------------------
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// VisualByCoordinates
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// ----------------------------------------------------------------------------
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//
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EXPORT_C CAlfVisual* HitTest::VisualByCoordinates( const CAlfControl& aControl, 
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        const TPoint& aPos )
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    {
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    TInt i = aControl.VisualCount();
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    while( --i >= 0 )
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        {
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        // Ask only root visuals, since all children are within the root visuals
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        if ( IsRootVisual( aControl.Visual( i ) ) )
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            {
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            const CAlfVisual* hitVisual = ::VisualByCoordinates( 
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                aControl.Visual( i ), aPos );
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            if ( hitVisual )
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                {
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                return const_cast< CAlfVisual* >( hitVisual );
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                }
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            }
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        }
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    return NULL;
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    }