1 <?xml version="1.0" encoding="utf-8"?>

     2 <!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

     3 <!-- This component and the accompanying materials are made available under the terms of the License 

     4 "Eclipse Public License v1.0" which accompanies this distribution, 

     5 and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->

     6 <!-- Initial Contributors:

     7     Nokia Corporation - initial contribution.

     8 Contributors: 

     9 -->

    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-422F37DF-F93F-443F-86EA-6A696A53E1E6" xml:lang="en"><title>Listening

    13 for scrollbar touch events</title><shortdesc>If your custom control contains a scrollbar, you need to listen

    14 for touch events in the scrollbar.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

    15 <p>For custom controls that override <codeph>CCoeControl::HandleScrollEventL()</codeph>,

    16 you must also call the base class implementation of the function.</p>

    17 <fig id="GUID-ECD9B9C0-0134-4D8A-B350-A797A5C1BE0F">

    18 <title>Scrollbar</title>

    19 <image href="GUID-8C8D6B06-E794-4269-B4DF-D2BE4DDB9E8B_d0e71515_href.png" scale="40" placement="inline"/>

    20 </fig>

    21 <p>For an implementation example, see below.</p>

    22 <codeblock xml:space="preserve">void CMyContainerControl::HandleScrollEventL( CEikScrollBar* aScrollBar, TEikScrollEvent aEventType )

    23     {

    24     if( !aScrollBar )

    25         {

    26         return;

    27         }

    28 

    29     TInt newPosition = aScrollBar->ThumbPosition();

    30     

    31     switch( aEventType )

    32         {

    33         case EEikScrollUp: // Moving up one step

    34             {

    35             MoveFocusUpL();

    36             break;

    37             }

    38         case EEikScrollDown: // Moving down one step

    39             {

    40             MoveFocusDownL();

    41             break;

    42             }

    43         case EEikScrollThumbDragVert: // Drag started

    44         case EEikScrollThumbReleaseVert: // Drag released

    45             {

    46             if( newPosition < iFocusedIndex )

    47                 {

    48                 MoveFocusUpL();

    49                 }

    50             else if( newPosition > iFocusedIndex )

    51                 {

    52                 MoveFocusDownL();

    53                 }

    54             break;

    55             }

    56         case EEikScrollPageUp:

    57             {

    58             while( newPosition < iFocusedIndex )

    59                 {

    60                 MoveFocusUpL();

    61                 }

    62             break;

    63             }

    64         case EEikScrollPageDown:

    65             {

    66             while( newPosition > iFocusedIndex )

    67                 {

    68                 MoveFocusDownL();

    69                 }

    70             break;

    71             }

    72         default:

    73             {

    74             break;

    75             }

    76         }

    77     DrawNow();

    78     }</codeblock>

    79 </conbody></concept>