<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE concept
  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-422F37DF-F93F-443F-86EA-6A696A53E1E6" xml:lang="en"><title>Listening
for scrollbar touch events</title><shortdesc>If your custom control contains a scrollbar, you need to listen
for touch events in the scrollbar.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
<p>For custom controls that override <codeph>CCoeControl::HandleScrollEventL()</codeph>,
you must also call the base class implementation of the function.</p>
<fig id="GUID-ECD9B9C0-0134-4D8A-B350-A797A5C1BE0F">
<title>Scrollbar</title>
<image href="GUID-8C8D6B06-E794-4269-B4DF-D2BE4DDB9E8B_d0e38310_href.png" scale="40" placement="inline"/>
</fig>
<p>For an implementation example, see below.</p>
<codeblock xml:space="preserve">void CMyContainerControl::HandleScrollEventL( CEikScrollBar* aScrollBar, TEikScrollEvent aEventType )
    {
    if( !aScrollBar )
        {
        return;
        }

    TInt newPosition = aScrollBar-&gt;ThumbPosition();
    
    switch( aEventType )
        {
        case EEikScrollUp: // Moving up one step
            {
            MoveFocusUpL();
            break;
            }
        case EEikScrollDown: // Moving down one step
            {
            MoveFocusDownL();
            break;
            }
        case EEikScrollThumbDragVert: // Drag started
        case EEikScrollThumbReleaseVert: // Drag released
            {
            if( newPosition &lt; iFocusedIndex )
                {
                MoveFocusUpL();
                }
            else if( newPosition &gt; iFocusedIndex )
                {
                MoveFocusDownL();
                }
            break;
            }
        case EEikScrollPageUp:
            {
            while( newPosition &lt; iFocusedIndex )
                {
                MoveFocusUpL();
                }
            break;
            }
        case EEikScrollPageDown:
            {
            while( newPosition &gt; iFocusedIndex )
                {
                MoveFocusDownL();
                }
            break;
            }
        default:
            {
            break;
            }
        }
    DrawNow();
    }</codeblock>
</conbody></concept>