Re: [Linuxwacom-discuss] XInput and know which device sent the event

[Voluspa <li...@te...>]

On Thu, 19 Jan 2006 12:38:40 +0100 Michael Kleiber wrote:

> I am programming an application that uses the XInput extension to 
> evaluate pen input. I followed the xidump sample and everything is 
> working so far.
> 
> I know want to distinguish the different tools of my tablet (stylus, 
> eraser, mouse, etc) but am not sure how to do it. The
> XDeviceMotionEvent  has a deviceid member but this does not seem to
> change whatever tool I use.
> 
> How can I find out what device the xevent was sent from?

You have to set up a XDevice and XDeviceInfo for each tool through the
XListInputDevices call, and then register with the X server which
events of each tool you are interested in receiving.

For a well commented example *cough*cough* see my
http://web.telia.com/~u46133770/wacom/ program to filter out the "pad"
device of an Intuos3 (the buttons and touch strips). The functions in
get_device.c and reg_events.c (called from main_setup.c) are modified
and stripped down versions of Frederic Lepied's program xinput-1.2 from
1996 - the functions in xinput.c and test.c files of that package.

I'm not juggling different devices there though, so please don't make me
think about the problem by further questions ;-) All I do is receive
events from the "pad" and optionally tell the "stylus" to toggle mode
between Absolute and Relative. The latter function in pen_mode.c is
based on setmode.c from Lepied's package. I suggest you bring home his
program for perusal, although it contains almost zero comments.

I don't have a link, but the tarball is named xinput-1.2.tar.gz

Mvh
Mats Johannesson
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