From: martin rudalics <rudalics@gmx.at>
To: Oleh Krehel <ohwoeowho@gmail.com>, 20100@debbugs.gnu.org
Subject: bug#20100: 24.4.91; Can't scroll a window while in minibuffer
Date: Fri, 13 Mar 2015 17:58:04 +0100 [thread overview]
Message-ID: <5503171C.4070704@gmx.at> (raw)
In-Reply-To: <87h9tp6ox3.fsf@gmail.com>
> I'm trying to write a completion package using `read-from-minibuffer'
> combined with `post-command-hook'.
>
> Everything is working OK, except when I want to sync the current
> completion candidate (one of buffer's lines) with the corresponding line
> in the buffer.
>
> This code, specifically `recenter', doesn't work:
>
> (with-current-buffer buf
> (goto-char (point-min))
> (forward-line (1- num))
> (recenter))
I suppose that at the time you invoke `recenter', the selected window
doesn't show `buf'. When with emacs -Q I do
(let ((buffer (get-buffer-create "*buffer*"))
(line 0))
(set-window-buffer nil buffer)
(with-current-buffer buffer
(while (< line 100)
(insert (format "%02d\n" line))
(setq line (1+ line))))
(with-current-buffer buffer
(goto-char (point-min))
(forward-line 25)
(recenter)))
then I see the line starting with "25" centered in the selected window.
Can you try modifying my example such that it "doesn't work for you"?
> However, this code will scroll the window (`buf' and `wnd' correspond to
> each other):
>
> (with-current-buffer buf
> (goto-char (point-min))
> (forward-line (1- num))
> (setf (window-point wnd)
> (point)))
The fact that you apparently have to
(setf (window-point wnd) (point))
seems to suport my claim above, namely that `wnd' is not selected at
that time.
> Still, it's not a perfect solution, since even after setting
> `window-point', (window-start wnd) and (window-end wnd t) will not
> return the correct thing.
What is the wrong thing and what would the correct thing be? The only
function that should work "correctly" here is `set-window-start'.
> I'm pretty sure it's a bug and the code above should work as is, but I'd
> also appreciate pointers for achieving the scrolling and window bounds
> re-calculation for the current Emacs.
Beyond what you can read in the documentations, explaining `recenter' is
hardly possible without explaining redisplay as well. You have to look
at its implementation.
martin
next prev parent reply other threads:[~2015-03-13 16:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-13 12:51 bug#20100: 24.4.91; Can't scroll a window while in minibuffer Oleh Krehel
2015-03-13 16:58 ` martin rudalics [this message]
2015-03-13 17:10 ` Oleh Krehel
2015-03-13 18:16 ` martin rudalics
2015-03-13 18:41 ` Oleh Krehel
2015-03-13 20:58 ` Eli Zaretskii
2015-03-14 8:17 ` martin rudalics
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5503171C.4070704@gmx.at \
--to=rudalics@gmx.at \
--cc=20100@debbugs.gnu.org \
--cc=ohwoeowho@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).