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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_d0e65866_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->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 < iFocusedIndex )

                {

                MoveFocusUpL();

                }

            else if( newPosition > iFocusedIndex )

                {

                MoveFocusDownL();

                }

            break;

            }

        case EEikScrollPageUp:

            {

            while( newPosition < iFocusedIndex )

                {

                MoveFocusUpL();

                }

            break;

            }

        case EEikScrollPageDown:

            {

            while( newPosition > iFocusedIndex )

                {

                MoveFocusDownL();

                }

            break;

            }

        default:

            {

            break;

            }

        }

    DrawNow();

    }</codeblock>

</conbody></concept>