From: Stefan Monnier <monnier@iro.umontreal.ca>
To: xenodasein@tutanota.de
Cc: Help Gnu Emacs <help-gnu-emacs@gnu.org>
Subject: Re: Explanation Request for the Function set-transient-map in subr.el
Date: Sun, 28 Nov 2021 14:45:03 -0500 [thread overview]
Message-ID: <jwvilwcysm8.fsf-monnier+Inbox@gnu.org> (raw)
In-Reply-To: <Mpbj_Pk--3-2@tutanota.de> (xenodasein@tutanota.de's message of "Sun, 28 Nov 2021 19:12:56 +0100 (CET)")
xenodasein@tutanota.de [2021-11-28 19:12:56] wrote:
> Thanks for your clarification on isearch issue.
>>> ((eq t keep-pred)
>>> (let ((mc (lookup-key map (this-command-keys-vector))))
>>> ;; If the key is unbound `this-command` is
>>> ;; nil and so is `mc`.
>>> (and mc (eq this-command mc))))
>
> I'm still not clear why exactly this expression is used though: (eq this-command mc).
> What are the possible values of mc here on the last line?
This tests whether the user typed a key-sequence from `map` as opposed
to some other one.
E.g. when you use `text-scale-adjust`, you want to "stay" in the
transient map as long as the user uses one of the keys in the `map`
(basically, +, -, or 0) and if the user types some other key, we
immediately/automatically exit from this transient map.
Stefan
next prev parent reply other threads:[~2021-11-28 19:45 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-11 18:10 Explanation Request for the Function set-transient-map in subr.el xenodasein--- via Users list for the GNU Emacs text editor
2021-11-12 14:41 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-11-14 12:08 ` FWD: " xenodasein--- via Users list for the GNU Emacs text editor
2021-11-14 13:04 ` xenodasein--- via Users list for the GNU Emacs text editor
2021-11-14 23:13 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-11-28 18:12 ` xenodasein--- via Users list for the GNU Emacs text editor
2021-11-28 19:17 ` Michael Heerdegen
2021-11-28 19:45 ` Stefan Monnier [this message]
2021-11-28 20:48 ` xenodasein--- via Users list for the GNU Emacs text editor
2021-11-28 21:07 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-11-28 21:24 ` Michael Heerdegen
2021-11-28 22:29 ` xenodasein--- via Users list for the GNU Emacs text editor
2021-11-28 22:44 ` xenodasein--- via Users list for the GNU Emacs text editor
2021-11-29 10:28 ` Michael Heerdegen
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