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From: martin rudalics <rudalics@gmx.at>
To: sbaugh@catern.com, emacs-devel@gnu.org
Subject: Re: Horizontal centering in the display engine
Date: Wed, 14 Apr 2021 10:28:07 +0200	[thread overview]
Message-ID: <5291bf34-cb80-8a22-1187-195cbc6b3544@gmx.at> (raw)
In-Reply-To: <8735vtx62w.fsf@catern.com>

 > The behavior I want is what's described here:
 > https://en.wikipedia.org/wiki/Typographic_alignment#Centered

I think the below should do most of what's needed.


(defun center-after-text-change (begin end _length)
   "..."
   (save-excursion
     (let ((from (progn (goto-char begin) (line-beginning-position)))
	  (to (progn (goto-char end) (line-beginning-position 2))))
       (center-region from to))))

(defun center-after-window-change (window)
   "..."
   (with-current-buffer (window-buffer window)
     (setq fill-column (window-body-width window))
     (center-region (window-start window) (window-end window))))

(with-current-buffer (get-buffer-create "*text*")
   (add-hook 'after-change-functions #'center-after-text-change 0 t)
   (add-hook 'window-state-change-functions #'center-after-window-change 0 t))

(switch-to-buffer "*text*")


But if you insist on handling variable-pitch text, things will get
expensive.

martin



  parent reply	other threads:[~2021-04-14  8:28 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-13 18:25 Horizontal centering in the display engine 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 [this message]
  -- strict thread matches above, loose matches on Subject: below --
2021-04-15  5:13 Paul W. Rankin via Emacs development discussions.
2021-04-15  7:04 ` Eli Zaretskii
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.

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