On 01/19/2010 10:37 AM, ext Peter Hutterer wrote: > On Tue, Jan 19, 2010 at 10:04:53AM +0100, Bradley T. Hughes wrote: >> On 01/19/2010 09:43 AM, ext Peter Hutterer wrote: >>>>> given the easy case of a single user interacting with a surface: >>>>> with Qt as it is now, if you get all the coordinates in a single XI2 >>>>> event, >>>>> would that work for you? or is there extra information you need? >>>> >>>> That should work. Ideally I would like to also get some kind of >>>> indication from the device that it is a touch device, and what kind >>>> of touch device it is (it is a touchscreen or a touchpad? for >>>> example, we treat them slightly differently). >>> >>> Well, given the right axis labels that's the indication then :) >> >> Can you give me an example? Right now, I'm struggling with finding >> out how to get this information from the evdev driver to the client. > > as part of InitValuatorAxisStruct, the driver passes in an array of atoms > specifying the labels for the axes it announced. these are defined in > xserver-properties.h but are essentially free-form. so you can label them as > e.g. "Touchpoint1 X", "Touchpoint1 Y" (this needs to be put in the driver, > the current one doesn't do it). > you can then have the client ask the driver for the axis labels and if one > of the multi-touch axes is found, behave accordingly.
Ah, right, now I see it. > there's no good way to label some device as "touchpad" and one shouldn't do > so (the driver has to for technical reasons) since chances are likely that > devices will turn up that are both touchpad and $OTHERDEVICE. That I understand, and is kind of the situation I'm in with the hardware I've got. It does both touch and pen. I'm assuming button labels could also be used to indicate when a button press comes from a finger (BTN_TOUCH_FINGER) or a pen (BTN_TOUCH_PEN)? -- Bradley T. Hughes (Nokia-D-Qt/Oslo), bradley.hughes at nokia.com Sandakervn. 116, P.O. Box 4332 Nydalen, 0402 Oslo, Norway _______________________________________________ xorg-devel mailing list [email protected] http://lists.x.org/mailman/listinfo/xorg-devel
