Le 9 mars 10 à 23:29, Henrik Rydberg a écrit :
Stéphane Chatty wrote:
Le 9 mars 10 à 22:59, Henrik Rydberg a écrit :
On the contrary, the MT protocol is dependent on one of the
single-touch events
BTN_TOUCH or ABS_PRESSURE to be present in the event stream for
proper
device
identification and for correct handling of zero-finger events.
The latter
because at least one value (BTN_TOUCH or ABS_PRESSURE) must change
state to pass
through input filtering when no fingers are present. This is what
needs
clarification.
Someone has pointed this to me a few weeks ago and tbh I had the
feeling
that this is a bug in the protocol that we failed to notice last
summer.
I agree with you that BTN_TOUCH plugs the hole, but I don't find
it very
satisfactory that we need one protocol to inform another.
Frankly, I never even imagined there would be pure MT devices
without support
for the existing single-touch applications. But sure, it was an
oversight at the
time.
In my case, not detecting it was a pure mistake, nothing else :-) And
I've worked with formal models of input devices for decades, which
makes it really embarrassing.
St.
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