Re: [NSEvent isARepeat]

[Chris Vetter]

On 2006-04-28 09:49:36 +0200 Richard Frith-Macdonald 
<richard@tiptree.demon.co.uk> wrote:
> On 28 Apr 2006, at 10:23, Stephane Goujet wrote:
> A quick look at the backend source code reveals (back/Source/x11/ 
> XGServerEvent.m) the line ...
> isARepeat: NO /* isARepeat can't be supported with X */
> So the X11 backends always set it to 'NO'
> I have no idea whether the comment is really accurate ... but I guess 
>  the 
> issue to look at is if/how you can determine whether a keypress  is a 
> repeat 
> in X, and if it can be determined you need to provide a  patch to do 
> it.

X11 doesn't give you an easy way deciding whether a key is repeated or 
not, however, it gives you everything you need for doing it yourself / 
the hard way.

You know when a key gets pressed, and when it's released. Therefor you 
know the timestamp when the key is pressed. So what you do is, when a 
key is pressed, you memorize
a) that a key is pressed for the first time (eg. in a BOOL)
b) the timestamp when it was pressed
c) which key it was (event key keysym)

Next key-down event, you check which key it is, compare it to the 
previous key and if it's equal and the timestamp from then and the 
timestamp 'now' is below a 'threshold' you got a double-press. Now you 
toggle 'first press' to false.

Next key-down event, you do the same, plus, if it's below the 
'threshold' AND 'first press' is false, we got a repeat.

I know, this is over-simplified, but you probably get the idea, what 
I'm talking about.

--
Chris