From: Eli Zaretskii <eliz@gnu.org>
To: "Paul W. Rankin" <pwr@bydasein.com>
Cc: sbaugh@catern.com, emacs-devel@gnu.org
Subject: Re: Horizontal centering in the display engine
Date: Thu, 15 Apr 2021 10:04:51 +0300 [thread overview]
Message-ID: <83zgy0xc30.fsf@gnu.org> (raw)
In-Reply-To: <66A8ED9D-F4C1-4DC0-9D8D-7EB82EA82DF4@bydasein.com> (pwr@bydasein.com)
> From: "Paul W. Rankin" <pwr@bydasein.com>
> Date: Thu, 15 Apr 2021 15:13:43 +1000
> Cc: Eli Zaretskii <eliz@gnu.org>,
> emacs-devel@gnu.org
>
> (defun center-align-line ()
> (let (line-width align-col)
> (setq line-width (- (line-end-position)
> (line-beginning-position)))
This calculation of line-width is, of course, only valid when there's
a single face used by the line's characters.
Using window-text-pixel-size will produce more accurate results, but
OP's main problem is not how to compute the line's width, it is how to
make the alignment adjust itself automatically to any changes in the
line's text and in the window's width.
next prev parent reply other threads:[~2021-04-15 7:04 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-15 5:13 Horizontal centering in the display engine Paul W. Rankin via Emacs development discussions.
2021-04-15 7:04 ` Eli Zaretskii [this message]
2021-04-15 11:39 ` Paul W. Rankin via Emacs development discussions.
2021-04-15 12:43 ` Stefan Monnier
2021-04-15 13:05 ` Paul W. Rankin via Emacs development discussions.
-- strict thread matches above, loose matches on Subject: below --
2021-04-13 18:25 sbaugh
2021-04-13 18:39 ` Eli Zaretskii
2021-04-13 19:28 ` sbaugh
2021-04-13 19:43 ` Eli Zaretskii
2021-04-13 20:49 ` sbaugh
2021-04-14 6:56 ` Eli Zaretskii
2021-04-14 13:28 ` sbaugh
2021-04-14 13:42 ` Yuan Fu
2021-04-14 14:04 ` Stefan Monnier
2021-04-14 15:22 ` sbaugh
2021-04-14 14:42 ` Eli Zaretskii
2021-04-14 15:25 ` sbaugh
2021-04-14 15:52 ` Eli Zaretskii
2021-04-14 8:28 ` martin rudalics
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