From: Sean McAfee <eefacm@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: (save-excursion (other-window 1)) leaves me in the other window
Date: Sun, 07 Mar 2010 19:09:18 -0800 [thread overview]
Message-ID: <m2eijvldb5.fsf@gmail.com> (raw)
In-Reply-To: 87y6i4sjsn.fsf@rapttech.com.au
Tim X <timx@nospam.dev.null> writes:
> Sean McAfee <eefacm@gmail.com> writes:
>> A native reimplementation of scroll-other-window doesn't work as I'd
>> expect:
>>
>> (save-excursion
>> (other-window 1)
>> (scroll-up))
>>
>> The problem is that the current window isn't restored, which surprised
>> me considerably. Why doesn't this work, and how would I write a
>> function to go do some stuff in the other window and then come back?
>
> As emacs already has the command to scroll the other window, I'm
> assuming your example is a simplification of what you really want to do.
True. The situation is this:
I have a frame, split horizontally into two windows. One window shows
text that came from an OCR process; the other window, in image-mode,
shows the (large) image that was the input to that OCR process. What I
want to do is work in the text window, shifting the image in the other
window around as I check it against the text. I assumed I could do
something like this:
(defmacro in-other-window (&rest body)
`(save-excursion (other-window 1) ,@body))
And then:
(global-set-key [(shift down)]
(lambda () (interactive) (in-other-window (image-next-line))))
...and similarly for the other three directions.
Although the documentation for save-excursion says that it saves and
restores the current buffer, it doesn't in this case. I still don't
really know why. I tried using save-window-excursion instead as Joe
Fineman suggested, but while that worked for image-next-line and
image-previous-line, it doesn't for image-forward-hscroll, which I need
for scrolling horizontally. I guess the horizontal scroll amount is
something that's saved and restored by save-window-excursion. So I
finally settled on this:
(defmacro in-other-window (&rest body)
`(progn
(other-window 1)
(unwind-protect
(progn ,@body)
(other-window -1))))
I just have to be careful not to alter the window configuration from
within in-other-window.
next prev parent reply other threads:[~2010-03-08 3:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-05 20:33 (save-excursion (other-window 1)) leaves me in the other window Sean McAfee
2010-03-05 22:21 ` Joe Fineman
2010-03-07 6:55 ` Tim X
2010-03-08 3:09 ` Sean McAfee [this message]
2010-03-08 7:26 ` Tim X
2010-03-08 16:55 ` Sean McAfee
2010-03-08 17:02 ` Sean McAfee
2010-03-08 17:24 ` David Kastrup
2010-03-09 6:45 ` Tim X
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
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=m2eijvldb5.fsf@gmail.com \
--to=eefacm@gmail.com \
--cc=help-gnu-emacs@gnu.org \
/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 external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.