Peter Hutterer wrote: > On Fri, Jun 18, 2010 at 09:41:01AM +0200, Henrik Rydberg wrote: >> Peter Hutterer wrote: >> [...] >>>> On the other hand, some devices carry a tiny be of extra information >>>> through the specific contact id's, and they are not strictly the lowest >>>> set of numbers needed to express the contacts that are active or have >>>> been activated since the last period of inactivity. From what I've >>>> heard the magic mouse (again) is one such example. I haven't actually >>>> poked around enough to see it. >>> do you have any info on what this extra information could be? >> You sit at a coffee table, coated with the finest multitouch film there is. >> You >> put down the tea cup and leave for the restroom, taking the btwallet with >> you. >> As everybody knows, once the btwallet is off the table, you are logged out. >> You >> come back, log in. Did anyone drink from your cup? > > Interesting example but I can't quite map it to the technical > implementation. We don't have a notion of "logged out", at our level the > tea cup would continue to produce touch points (or not, if lifted off). > Even someone drinking out of it with a straw is covered by the change in > pressure. > > "did anyone drink" is IMO too contextual that we can deal with it at our > level. we can only say "yes, the cup was lifted off" or "the cup is lighter > now". > > still not quite sure what that information could be.
Hehe, well, the example illustrates that if every new touch gets a unique tracking id, one can use that information to determine "newness" over extended periods of time. The straw trick does not really change that fact. Cheers, Henrik _______________________________________________ [email protected]: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: http://lists.x.org/mailman/listinfo/xorg-devel
