1 /*

     2 * Copyright (c) 2008-2008 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:  Gesture helper helper functions

    15 *

    16 */

    17 

    18 

    19 #include "gestureobserver.h"

    20 

    21 // system includes

    22 #include <alf/alfcontrol.h>

    23 #include <alf/alflayout.h>

    24 

    25 using namespace GestureHelper;

    26 

    27 namespace 

    28     {

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

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

    31         {

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

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

    34         if ( layout)

    35             {

    36             TInt i = layout->Count();

    37             while( --i >= 0 )

    38                 {

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

    40                     {

    41                     return &layout->Visual( i );

    42                     }

    43                 }

    44             }

    45             

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

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

    48             {

    49             return &aRoot;

    50             }

    51             

    52         // visual was not found

    53         return NULL;

    54         }

    55         

    56     TBool IsRootVisual( const CAlfVisual& aVisual )

    57         {

    58         return !aVisual.Layout();

    59         }

    60     } // unnamed namespace 

    61     

    62 // ----------------------------------------------------------------------------

    63 // VisualByCoordinates

    64 // ----------------------------------------------------------------------------

    65 //

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

    67         const TPoint& aPos )

    68     {

    69     TInt i = aControl.VisualCount();

    70     while( --i >= 0 )

    71         {

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

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

    74             {

    75             const CAlfVisual* hitVisual = ::VisualByCoordinates( 

    76                 aControl.Visual( i ), aPos );

    77             if ( hitVisual )

    78                 {

    79                 return const_cast< CAlfVisual* >( hitVisual );

    80                 }

    81             }

    82         }

    83     return NULL;

    84     }