[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Add a function that returns pixel distance between points?
From: |
Eli Zaretskii |
Subject: |
Re: Add a function that returns pixel distance between points? |
Date: |
Mon, 01 Feb 2021 20:22:38 +0200 |
> 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.
- Re: Add a function that returns pixel distance between points?, Yuan Fu, 2021/02/01
- Re: Add a function that returns pixel distance between points?,
Eli Zaretskii <=
- Re: Add a function that returns pixel distance between points?, Yuan Fu, 2021/02/01
- Re: Add a function that returns pixel distance between points?, Eli Zaretskii, 2021/02/02
- Re: Add a function that returns pixel distance between points?, Eli Zaretskii, 2021/02/03
- Re: Add a function that returns pixel distance between points?, Yuan Fu, 2021/02/03
- Re: Add a function that returns pixel distance between points?, Eli Zaretskii, 2021/02/04
- Re: Add a function that returns pixel distance between points?, martin rudalics, 2021/02/05
- Re: Add a function that returns pixel distance between points?, Eli Zaretskii, 2021/02/05
- Re: Add a function that returns pixel distance between points?, martin rudalics, 2021/02/05