From: Yuan Fu <casouri@gmail.com>
To: Ihor Radchenko <yantar92@gmail.com>
Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
Subject: Re: Add a function that returns pixel distance between points?
Date: Sun, 31 Jan 2021 14:42:27 -0500 [thread overview]
Message-ID: <1378BC8F-C997-4BC6-A414-A4086A3E3AE9@gmail.com> (raw)
In-Reply-To: <87mtwp4pru.fsf@localhost>
> On Jan 31, 2021, at 12:52 AM, Ihor Radchenko <yantar92@gmail.com> wrote:
>
> Yuan Fu <casouri@gmail.com> writes:
>
>> When the text is displayed in variable-pitch font, the bars aren’t aligned. I’m using display property (space :align-to) to align those bars. To know with pixel position to align to, I need to calculate each column’s pixel width, and met the difficulties mentioned earlier.
>
> You can do it in temp buffer with line numbers and wrap prefix disabled.
> Something like
>
> (defun string-display-pixel-width (string &optional mode)
> "Calculate pixel width of STRING.
> Optional MODE specifies major mode used for display."
> (with-temp-buffer
> (with-silent-modifications
> (setf (buffer-string) string))
> (when (fboundp mode)
> (funcall mode)
> (font-lock-fontify-buffer))
> (let (wrap-prefix display-line-numbers)
> (if (get-buffer-window (current-buffer))
> (car (window-text-pixel-size nil (line-beginning-position) (point)))
> (set-window-buffer nil (current-buffer))
> (car (window-text-pixel-size nil (line-beginning-position) (point)))))))
>
> Best,
> Ihor
Thanks, I’ll try that and see if it is fast enough for my use :-)
Yuan
next prev parent reply other threads:[~2021-01-31 19:42 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-30 20:47 Add a function that returns pixel distance between points? Yuan Fu
2021-01-31 3:31 ` Eli Zaretskii
2021-01-31 5:17 ` Yuan Fu
2021-01-31 5:52 ` Ihor Radchenko
2021-01-31 19:42 ` Yuan Fu [this message]
2021-01-31 15:24 ` Eli Zaretskii
2021-01-31 19:41 ` Yuan Fu
2021-01-31 20:13 ` Eli Zaretskii
2021-02-01 14:16 ` Yuan Fu
2021-02-01 18:22 ` Eli Zaretskii
2021-02-01 23:00 ` Yuan Fu
2021-02-02 16:29 ` Eli Zaretskii
2021-02-03 15:04 ` Eli Zaretskii
2021-02-03 16:48 ` Yuan Fu
2021-02-04 16:02 ` Eli Zaretskii
2021-02-05 10:15 ` martin rudalics
2021-02-05 12:25 ` Eli Zaretskii
2021-02-05 15:48 ` martin rudalics
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