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<concept id="GUID-4D2AA522-82AB-4D1E-9F1E-5C6A35DEF195" xml:lang="en"><title>Pointer

events</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p><draft-comment time="2007-02-26T14:58">Add some additional contextual

information and examples in a future release of the library.</draft-comment></p>

<p>Pointer events are handled by the controls. A control should implement

the function <xref href="GUID-F1BFA411-8316-314C-8E4A-C6140124CB58.dita"><apiname>CCoeControl:HandlePointerEventL()</apiname></xref>  to be able

to handle pointer events. The <xref href="GUID-F1BFA411-8316-314C-8E4A-C6140124CB58.dita"><apiname>CCoeControl:HandlePointerEventL()</apiname></xref> function

is called by the framework whenever a pointer event occurs within the control. </p>

<codeblock id="GUID-F12E88CC-31FF-4C26-8FEC-0BC2C7717907" xml:space="preserve">virtual void HandlePointerEventL(const TPointerEvent&amp; aPointerEvent);

</codeblock>

<p>Before passing pointer events to controls, the framework performs the

event processing. If a <xref href="GUID-1FFA0073-3D83-388E-A824-08C31F90CC54.dita#GUID-1FFA0073-3D83-388E-A824-08C31F90CC54/GUID-26CE2524-04BC-3592-A7E5-7EEC792A466E"><apiname>TPointerEvent::EButton1Down()</apiname></xref> event

occurred in the control and the control does not currently have keyboard focus,

it sends an event of type <xref href="GUID-A2BF9AE8-CF42-3D94-8763-66DB11EDDA46.dita#GUID-A2BF9AE8-CF42-3D94-8763-66DB11EDDA46/GUID-E1A96B7F-0AF1-3397-AA94-C55ED75B01EC"><apiname>MCoeControlObserver::EEventRequestFocus()</apiname></xref> to

the control's observer — normally the control's container. The container control

should then set focus onto the control in which the <xref href="GUID-1FFA0073-3D83-388E-A824-08C31F90CC54.dita#GUID-1FFA0073-3D83-388E-A824-08C31F90CC54/GUID-26CE2524-04BC-3592-A7E5-7EEC792A466E"><apiname>TPointerEvent::EButton1Down()</apiname></xref> event

occurred. </p>

<note>

<p>By default, pointer drag events and pointer move events are not delivered

to controls. For additional information, see functions <xref href="GUID-1460DD8F-9AA1-3B99-8FFD-F309959CCA34.dita#GUID-1460DD8F-9AA1-3B99-8FFD-F309959CCA34/GUID-175F4394-0747-3F42-9364-024B3C55E0A3"><apiname>RWindowBase::PointerFilter()</apiname></xref> and <xref href="GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160.dita#GUID-B06F99BD-F032-3B87-AB26-5DD6EBE8C160/GUID-477F4BAA-268B-3F9F-9C18-6C6BF5403805"><apiname>CCoeControl::ClaimPointerGrab()</apiname></xref>.</p>

</note>

<p> The following code example demonstrates usage of the <parmname>TPointerEvent </parmname>class:</p>

<codeblock id="GUID-E050A4D7-995E-4819-B172-DCA432E3191F" xml:space="preserve">void CEventsAppView::HandlePointerEventL( const TPointerEvent&amp; aPointerEvent )

    {

    switch( aPointerEvent.iType )

        {

        case TPointerEvent::EButton1Down:

            {

            // Button 1 down

            // Get pointer position

            TPoint positionX = aPointerEvent.iPosition.iX;

            TPoint positionY = aPointerEvent.iPosition.iY;

            break;

            }

        case TPointerEvent::EButton1Up:

            {

            // button 1 up

            break;

            }

        case TPointerEvent::EDrag:

            {

            // drag event

            break;

            }

        case TPointerEvent::EMove:

            {

            // move event

            break;

            }

        default:

            {

            // do something

            break;

            }

        }

    }   </codeblock>

<p>For information on advanced pointer events, see <xref href="GUID-A12A66ED-2C8F-5CE6-8F3E-332B045A35B4.dita">Advanced

pointers</xref> section.</p>

</conbody></concept>