From: Eli Zaretskii <eliz@gnu.org>
To: Yuan Fu <casouri@gmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: Add a function that returns pixel distance between points?
Date: Mon, 01 Feb 2021 20:22:38 +0200 [thread overview]
Message-ID: <83v9bb6429.fsf@gnu.org> (raw)
In-Reply-To: <51016978-4D2F-45A8-8589-F4562B6DC4A8@gmail.com> (message from Yuan Fu on Mon, 1 Feb 2021 09:16:52 -0500)
> From: Yuan Fu <casouri@gmail.com>
> Date: Mon, 1 Feb 2021 09:16:52 -0500
> Cc: "emacs-devel\\@gnu.org" <emacs-devel@gnu.org>
>
> > IOW, can you show a test case where using window-text-pixel-size
> > returns incorrect results for :align-to due to line-prefix?
>
> Here is an example:
>
> (let ((width))
> (insert "woome")
> (setq width (car (window-text-pixel-size
> nil (line-beginning-position) (point))))
> (put-text-property (line-beginning-position) (point)
> 'line-prefix " ")
> (message "true width: %d returned width: %d"
> width (car (window-text-pixel-size
> nil (line-beginning-position) (point)))))
>
> Run it in an empty buffer and it will print the expected width and returned width. In the snippet I’m trying to measure the width of the text.
This says:
true width: 40 returned width: 64
However, if I use :align-to with the value of 64 pixels, the stretch
of whitespace ends where I'd expect it to end: aligned to right after
"woome".
So I still don't understand the problem you are facing. Which is why
I asked for an example code which uses :align-to in a way similar to
what you intend to do in your table rendering code, because I wanted
to see a situation where :align-to produces incorrect results when
using the return value of window-text-pixel-size in the presence of
line-prefix. But the example you show doesn't use :align-to.
next prev parent reply other threads:[~2021-02-01 18:22 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
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 [this message]
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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