How to determine device responsible for CorePointer event from withinclient?

Peter Hutterer mailinglists at
Mon Dec 18 19:49:43 PST 2006

On 19/12/2006, at 13:44 , Troy Yee wrote:
> For some X-client applications, having the touchscreen behave like the
> mouse is exactly what is desired.  But I also have X-client  
> applications
> that should ignore touchscreen input but not mouse input.  Some X- 
> client
> applications also want to selectively ignore touchscreen input and  
> to be
> able to distinguish mouse motion from touchscreen motion.
> I had hoped that the event handler would be able to determine the  
> device
> from which an event originated but I have not found a way to do this
> yet.  Can anyone point me in a direction that will allow for this
> selective client behaviour?

google for tutorials on the X Input Extension or XI.
Some starting points (for Xlib)

The events you will get are (depending what masks you use)  
XDeviceMotionEvents, which have a deviceid.
Core pointer events just don't have a device id attached to them.


Multi-Pointer X Server

More information about the xorg mailing list