On Sun, Sep 26, 2010 at 1:16 AM, Brandon S Allbery KF8NH < allbery@ece.cmu.edu> wrote:
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On 9/23/10 11:27 , Daniel wrote:
For what I want to do I need to have exclusive access to the keyboard events so that I can rewrite them. I have been experimenting a bit
This really wants to be done in (or with the active help of) the X server. You might want to look at how various accessibility-related programs work.
I have figured that one in the meantime (Input Managers are another category of apps which are similar). Unfortunately, I haven't found any pure X based accessibility programs. Most seem to depend on D-Bus in some way. One of those would be AT-SPI initiated by Gnome (seems to be in flux at the moment).
* active grab on A reverts to passive (incl some FocusEvents & KeymapNotify to inform us that B is still held)
When A is pressed, grab the keyboard and manage key events yourself (which is what you want to do anyway, isn't it?) until all the keys you want to work with are released, at which point you drop the grab.
Good idea, didn't think about trying to promote the grab from passive to active in-flight. I'll try that one and see what comes from it.
You should probably look for x.org-related mailing lists.
Yep, I've already sent a mail off to the xorg list, as I figured that the pool of people trying to do something similar is probably larger over there. I have found two additional ways of tackling the problem. One is from an answer on the xorg list which makes use of defining an xkb mapping with 'action' key mappings. I haven't investigated it yet, and at the moment it requires a patch to the xserver which is in the X bugzilla. Another option would be to add an additional layer of indirection on top. I'm currently running the relevant Linux desktop on a VirtualBox VM. VirtualBox attaches the GUI through an inprocess mechanism, which can be remoted via a backwards compatible version of RDP (MS remote desktop protocol). If I stick an additional proxy between the two parties, then I can manipulate the keyboard events freely. Admittedly this is the last solution I will look into, because it sounds like a lot of work, and I cannot stay within XMonad to do the heavy lifting.
- -- brandon s. allbery [linux,solaris,freebsd,perl] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.10 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
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