does emacs know (xev-like) when a modifier key is pressed?

does emacs know (xev-like) when a modifier key is pressed?

[Joe Corneli]

I'd like to create a little mode-line "lighter" that will show which
combination of modifier keys is pressed.  (My keyboard has a sticky
key problem, so this would help me diagnose how to unjam the keys.)
Does Emacs know which modifiers are "on" at a given moment?

Re: does emacs know (xev-like) when a modifier key is pressed?

[Pascal J. Bourguignon]

Joe Corneli <holtzermann17@gmail.com> writes:

> I'd like to create a little mode-line "lighter" that will show which
> combination of modifier keys is pressed.  (My keyboard has a sticky
> key problem, so this would help me diagnose how to unjam the keys.)
> Does Emacs know which modifiers are "on" at a given moment?

M-x apropos RET modifier RET


-- 
__Pascal Bourguignon__                     http://www.informatimago.com/
A bad day in () is better than a good day in {}.

Re: does emacs know (xev-like) when a modifier key is pressed?

[Jason Rumney]

On Thursday, 13 September 2012 22:00:53 UTC+8, Joe Corneli  wrote:

> Does Emacs know which modifiers are "on" at a given moment?

No. Certainly not at the lisp level. On some platforms that do not support all modifiers being applied to any key, the C code has knowledge for some modifiers, but it isn't exposed outside of the keyboard handling code (see mod_key_state in w32inevt.c for example)

Re: does emacs know (xev-like) when a modifier key is pressed?

[Stefan Monnier]

> Does Emacs know which modifiers are "on" at a given moment?

Emacs could know (at least under X11 and probably under other GUIs as
well), but it currently opts to stay in the dark.


        Stefan