1 /*

     2 * Copyright (c) 2008-2009 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:    Layout mapping index to distance from focus

    15 *

    16 */

    17 

    18 

    19 

    20 

    21 #include "glxfollowfocuslayout.h" 

    22 

    23 #include <mglxvisuallist.h>	// MGlxVisualList

    24 #include "glxpanic.h" // Panic codes

    25 #include <mglxanimation.h>

    26 

    27 // -----------------------------------------------------------------------------

    28 // Constructor

    29 // -----------------------------------------------------------------------------

    30 EXPORT_C TGlxFollowFocusLayout::TGlxFollowFocusLayout()

    31 	: iVisualList( NULL )

    32     {

    33     }

    34 

    35 // -----------------------------------------------------------------------------

    36 // Destructor

    37 // -----------------------------------------------------------------------------

    38 EXPORT_C TGlxFollowFocusLayout::~TGlxFollowFocusLayout() 

    39     {

    40     }

    41 

    42 // -----------------------------------------------------------------------------

    43 // SetVisualListL

    44 // -----------------------------------------------------------------------------

    45 //

    46 EXPORT_C void TGlxFollowFocusLayout::SetVisualListL(

    47 	MGlxVisualList* aVisualList )

    48     {

    49     __ASSERT_DEBUG( aVisualList, Panic( EGlxPanicNullVisualList ) );

    50 

    51     iVisualList = aVisualList;

    52     }

    53 

    54 // -----------------------------------------------------------------------------

    55 // DoSetLayoutValues

    56 // -----------------------------------------------------------------------------

    57 void TGlxFollowFocusLayout::DoSetLayoutValues( TGlxLayoutInfo& aInfo )

    58     {

    59     __ASSERT_DEBUG( iVisualList, Panic( EGlxPanicNullVisualList ) );

    60 

    61     // change the mappedindex to be relative to focus but wrapped around

    62     // so if the list items are

    63     //  0, 1, 2, 3, 4, 5, 6

    64     // -2,-1, 0, 1, 2, 3,-3 == focus in 2

    65     // -3,-2,-1, 0, 1, 2, 3 == focus in 3

    66     //  1, 2, 3,-3,-2,-1, 0 == focus in 6

    67     //  0, 1, 2, 3,-3,-2,-1 == focus in 0

    68 

    69     // calculate the current index - focus

    70     TInt index = aInfo.Index() - iVisualList->FocusIndex();

    71     

    72     // get item count

    73     TInt itemCount = iVisualList->ItemCount();

    74     TInt maxDist = itemCount / 2;

    75 

    76     // if index is smaller than smallest possible

    77     if ( index < -maxDist )

    78         {

    79         // wrap around

    80         index += itemCount;

    81         }

    82     // if index is larger than biggest possible

    83     else if ( index >= maxDist )

    84         {

    85         // wrap around

    86         index -= itemCount;

    87         }

    88     // assign the mapped index

    89     aInfo.iMappedIndex = index;

    90     }