XInput 'use' values not listed in spec

PaladinOfKaos · 06-02-2009, 05:44 PM

There are two values for the XDeviceInfo.use property that are used in the modern X.org server, but are not defined in the spec. They are:

Code:

3: IsXExtensionKeyboard
4: IsXExtensionPointer

If I had to guess, I would say they mean "This device is being used to generate core [pointer,keyboard] events, but it can also be used as an extension device". Is this correct? If not, what is the actual meaning of those values?

stevexyz · 06-04-2009, 06:52 PM

Hi Paladin,

From the MPX page:
http://wearables.unisa.edu.au/mpx/

...in addition, the XDeviceInfo also contains a "use" field, which is of some importance. The use field can have one of 5 values:

* IsXPointer for any master pointer (i.e. cursor).
* IsXKeyboard for any master keyboard (i.e. keyboard focus)
* IsXExtensionPointer for any physical pointer device.
* IsXExtensionKeyboard for any physical keyboard device.
* IsXExtensionDevice for any physical device that is neither pointer nor keyboard (this is fairly uncommon).

I use XFree86 which seems to do it a little differently (you check for IsXExtensionDevice then check the name field) so I can't verify how much of this applies to X.org.

Cheers, Steve