From: sbaugh@catern.com
To: emacs-devel@gnu.org
Subject: Re: Horizontal centering in the display engine
Date: Wed, 14 Apr 2021 11:25:41 -0400 [thread overview]
Message-ID: <87fszsvqfe.fsf@catern.com> (raw)
In-Reply-To: 83k0p5ylkb.fsf@gnu.org
Eli Zaretskii <eliz@gnu.org> writes:
> No, you only need to update them when the length of some of the lines
> changes. That is why the values are different for each line: the
> lines will usually have different lengths, and that length is part of
> the value of :align-to. Right?
Oh, that's true, I only need to update them when the length of the line
changes.
>> > And if we go one level higher, I guess you intend to write a
>> > post-command-hook that recalculates the :align-to specs whenever text
>> > changes, is that right? Or how did you plan on taking text changes
>> > into consideration?
>>
>> No, I want my :align-to specs to stay the same as text changes.
>
> You want the display engine to evaluate the function call for you?
> That's not possible at the moment, the expression language accepted by
> :align-to is somewhat limited. It can automatically react to changes
> in a variable's value, but in that case it must be the same variable
> for all the lines, and that contradicts what you want to do.
Yes, that makes sense. So I'm asking about how difficult it would be to
add a new element to the :align-to expression language, one which
specifies the width of the current line. Arbitrary function calls is
not necessary for what I want, just something specifically for the width
of the current line, in the same way there's already elements for
left-fringe etc.
next prev parent reply other threads:[~2021-04-14 15:25 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 [this message]
2021-04-14 15:52 ` Eli Zaretskii
2021-04-14 8:28 ` martin rudalics
-- 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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