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The following examples demonstrate how to process window-related event types, which events are local to specific windows and include pointer events.
To detect if a pointer event has been issued, use the EEventPointerEnter
, EEventPointerExit
, EEventPointer
and EEventDragDrop
event types.
You can request information about the pointer event type by calling the TWsEvent::Pointer()
function.
// Pointer events
case EEventPointer:
case EEventDragDrop:
{
// Gets the pointer position
TPointerEvent& pointerEvent = *iWsEvent.Pointer();
TPoint point = pointerEvent.iPosition;
break;
}
To detect whether pointer events are ready to retrieve from a buffer, use the EEventPointerBufferReady
event type.
The RWindowBase::EnablePointerMoveBuffer()
function instructs the window server to begin putting pointer events into the pointer move buffer.
You can get the buffer containing the stored pointer events by calling RWindowBase::RetrievePointerMoveBuffer()
.
// Pointer events are ready to retrieve from a buffer
case EEventPointerBufferReady:
{
const TInt KPointerMoveBufferSize = 20;
// Gets the window
RWindow* window = (RWindow*)(iWsEvent.Handle());
// Set up an array of TPoints into which to read the buffer
TPoint pnts[KPointerMoveBufferSize];
TPtr8 ptr((TUint8 *)&pnts;,sizeof(pnts));
TInt numPts = window -> RetrievePointerMoveBuffer(ptr);
break;
}
Note that the way to map the handle to a window depends on the environment that you are working in, usually this will be the UI Control Framework which will have to do this mapping a different way.