From: martin rudalics <rudalics@gmx.at>
To: Eli Zaretskii <eliz@gnu.org>, Daniel Mendler <mail@daniel-mendler.de>
Cc: 47712@debbugs.gnu.org
Subject: bug#47712: 27.1; Provide `string-display-width` function, which takes properties into account, `substring-width`
Date: Tue, 13 Apr 2021 09:06:06 +0200 [thread overview]
Message-ID: <b45c1317-be00-eb00-5417-67a0b53edb4b@gmx.at> (raw)
In-Reply-To: <835z0r308u.fsf@gnu.org>
> (defun string-pixel-width (string)
> (with-current-buffer (get-buffer-create "foo")
> (erase-buffer)
> (insert string)
> (window-text-pixel-size nil (point-min) (point-max))))
[...]
> (There's indeed something strange with the results, I think the
> with-current-buffer thing is not enough (because if I manually switch
> to buffer "foo" and run the function, it returns correct results). I
> will take a closer look when I have time, unless martin beats me to
> it.)
For `window-text-pixel-size' to work correctly, the buffer in question
must be the buffer of the first argument of `window-text-pixel-size'
(that's what the display engine expects). OTOH Elisp code doesn't have
to care about whether that buffer is current (but it can't harm either).
So one way to write `string-pixel-width' should be
(defun string-pixel-width (string)
(let ((buffer (get-buffer-create "*foo*"))
(old-buffer (window-buffer)))
(with-current-buffer buffer
(erase-buffer)
(insert string)
(set-window-buffer (selected-window) buffer)
(prog1
(window-text-pixel-size nil (point-min) (point-max))
(set-window-buffer (selected-window) old-buffer)))))
martin
next prev parent reply other threads:[~2021-04-13 7:06 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-11 21:16 bug#47712: 27.1; Provide `string-display-width` function, which takes properties into account, `substring-width` Daniel Mendler
2021-04-12 2:26 ` Eli Zaretskii
2021-04-12 8:45 ` Daniel Mendler
2021-04-12 8:53 ` Lars Ingebrigtsen
2021-04-12 9:08 ` Daniel Mendler
2021-04-13 8:01 ` Lars Ingebrigtsen
2021-04-13 12:00 ` Eli Zaretskii
2021-04-13 12:25 ` Daniel Mendler
2021-04-14 8:50 ` Eli Zaretskii
2021-04-14 10:49 ` Daniel Mendler
2021-04-14 11:38 ` Eli Zaretskii
2021-04-12 12:21 ` Eli Zaretskii
2021-04-12 12:50 ` Daniel Mendler
2021-04-12 13:21 ` Eli Zaretskii
2021-04-12 13:32 ` Daniel Mendler
2021-04-12 13:40 ` Eli Zaretskii
2021-04-12 14:05 ` Daniel Mendler
2021-04-12 14:15 ` Eli Zaretskii
2021-04-12 14:32 ` Eli Zaretskii
2021-04-12 14:38 ` Daniel Mendler
2021-04-12 17:01 ` Eli Zaretskii
2021-04-12 17:18 ` Daniel Mendler
2021-04-13 7:06 ` martin rudalics [this message]
2021-04-13 12:23 ` Eli Zaretskii
2021-04-12 14:36 ` Daniel Mendler
2021-04-12 17:09 ` Eli Zaretskii
2021-04-12 17:13 ` Daniel Mendler
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