From: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: rms@gnu.org, emacs-devel@gnu.org
Subject: Re: Function for deleting a key binding in a sparse keymap
Date: Tue, 06 Dec 2005 20:56:11 -0500 [thread overview]
Message-ID: <87pso97k0r.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <4396184A.60606@student.lu.se> (Lennart Borgman's message of "Wed, 07 Dec 2005 00:01:30 +0100")
> I feel a bit stupid because this example is not terribly important. However
> this is what I do. There is a minor mode where I use this,
> bw-window-resize-mode. When entering this mode I do:
> (mapc (lambda(key)
> (define-key bw-keymap (vector key) nil))
> help-event-list)
> I set the "help keys" to nil so that the help is still available during
> resizing. Those are the keys I want to remove afterwards. The default value
> in the sparse keymap bw-keymap is:
> (define-key bw-keymap [t] 'bw-exit-resize-mode)
I see. Coming from a functional programming background, I'd use anoter
approach based on the idea of reusing the original value rather than using
side-effects to try and coerce it back to the same shape it had originally:
(defvar bw-keymap
(let ((map (make-sparse-keymap)))
(define-key map [t] 'bw-exit-resize-mode)
map))
then when adding help-event-list bindings:
(setq bw-keymap (let ((map (make-sparse-keymap)))
(set-keymap-parent map bw-keymap)
map))
;; dolist is more efficient than mapc.
(dolist (key help-event-list)
(define-key bw-keymap (vector key) nil))
and when you want to remove those keys, just do
(setq bw-keymap (keymap-parent bw-keymap))
Of course, you can use variants of it, e.g. introduce a "bw-basic-map"
variable to keep the original map, rather than rely on (keymap-parent
bw-keymap) holding that original map.
Stefan
next prev parent reply other threads:[~2005-12-07 1:56 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-04 23:58 Function for deleting a key binding in a sparse keymap Lennart Borgman
2005-12-05 16:38 ` Richard M. Stallman
2005-12-05 16:55 ` Lennart Borgman
2005-12-06 16:42 ` Richard M. Stallman
2005-12-06 17:04 ` Lennart Borgman
2005-12-06 21:26 ` Stefan Monnier
2005-12-06 22:18 ` Lennart Borgman
2005-12-06 22:28 ` Stefan Monnier
2005-12-06 23:01 ` Lennart Borgman
2005-12-07 1:56 ` Stefan Monnier [this message]
2005-12-07 9:56 ` Lennart Borgman
2005-12-07 10:13 ` Lennart Borgman
2005-12-07 14:33 ` Lennart Borgman
2005-12-08 9:10 ` Kim F. Storm
2005-12-07 17:06 ` Richard M. Stallman
2005-12-07 17:12 ` Lennart Borgman
2005-12-05 19:42 ` Stefan Monnier
-- strict thread matches above, loose matches on Subject: below --
2005-12-08 9:32 LENNART BORGMAN
2005-12-08 14:24 ` Kim F. Storm
2005-12-08 15:03 ` Lennart Borgman
2005-12-08 16:53 ` Stefan Monnier
2005-12-08 18:36 ` Lennart Borgman
2005-12-08 18:56 ` Stefan Monnier
2005-12-08 23:59 ` Lennart Borgman
2005-12-09 11:24 ` Kim F. Storm
2005-12-09 15:03 ` Richard M. Stallman
2005-12-09 20:12 ` Lennart Borgman
2005-12-10 4:13 ` Richard M. Stallman
2005-12-10 23:45 ` Lennart Borgman
2005-12-11 1:12 ` Stefan Monnier
2005-12-11 2:16 ` Lennart Borgman
2005-12-11 8:14 ` Stefan Monnier
2005-12-11 16:49 ` Richard M. Stallman
2005-12-11 16:49 ` Richard M. Stallman
2005-12-12 1:41 ` Lennart Borgman
2005-12-12 15:52 ` Stefan Monnier
2005-12-12 17:02 ` Lennart Borgman
2005-12-13 15:52 ` Stefan Monnier
2005-12-12 16:18 ` Richard M. Stallman
2005-12-12 19:09 ` Lennart Borgman
2005-12-13 17:50 ` Richard M. Stallman
2005-12-14 0:50 ` Lennart Borgman
2005-12-14 20:02 ` Richard M. Stallman
2005-12-10 23:40 ` Kim F. Storm
2005-12-11 0:29 ` Lennart Borgman
2005-12-11 0:54 ` Lennart Borgman
2005-12-11 16:49 ` Richard M. Stallman
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