On 10 Apr 2013, at 21:55, Richard Sanders wrote: > Out of curiosity I did a bit of googling and found this. > > http://www.jveweb.net/en/archives/2010/11/making-better-use-of-the-caps-lock-key-in-linux.html > > It would seem that trying to trap cap locks could be fruitless because > of key re mapping.
That's quite an interesting article, and mercifully short given the subject matter... It had never occurred to me to fire up xev and see what the Mac hosted VM was actually seeing, so I just spent a little time staring at that. It's not pretty... It's also clear that there's *a lot* of "manipulation" of kbd events going on "under the covers" for the Caps Lock key - if I press a regular key (say "a") I get one press event and one release event, on the "a" key. Fine. If I press and release Caps Lock, I get a veritable flurry or key press/release events (for the Caps Lock key), many with the same time stamp (and interleaved with events for the Shift_L, which of course I'm *not* pressing at all.) The *next* key I press, after releasing the Caps Lock key, is *also* associated with a series of Caps Lock and Shift_L events, before the key I actually pressed appears... With the correct CAPS/lower state applied. However, Num Lock; which to me seems conceptually similar, just delivers nice, clean key press/release events. (And updates the keyboard state.) I have no idea why Caps Lock doesn't just do that too. Complicated stuff is happening under the covers... However, for Howard's needs, it possibly does not matter - even key remapping may not really matter; I guess that he does not care which physical key is acting as Caps Lock, so long as he can detect whether the current keyboard state has Caps Lock on or off. The difficulty is that, at least in my VM's, the keyboard state is not resolved fully until the next key after the Caps Lock toggle. I assume, from the tests reported by others, that "real" PC's return less convoluted state and it more or less works? _______________________________________________ fltk mailing list fltk@easysw.com http://lists.easysw.com/mailman/listinfo/fltk
