mulwidgets/gesturehelper/src/hittest.cpp
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     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     }