From: Yuan Fu <casouri@gmail.com>
To: sbaugh@catern.com
Cc: emacs-devel <emacs-devel@gnu.org>
Subject: Re: Horizontal centering in the display engine
Date: Wed, 14 Apr 2021 09:42:54 -0400 [thread overview]
Message-ID: <F5754B1E-2735-4356-B508-B2C92EBF7991@gmail.com> (raw)
In-Reply-To: <87tuo9uh9m.fsf@catern.com>
> On Apr 14, 2021, at 9:28 AM, sbaugh@catern.com wrote:
>
> Eli Zaretskii <eliz@gnu.org> writes:
>>>> E.g., are you planning on centering each line separately, or
>>>> everything together, or something else?
>>>
>>> Each line separately.
>>
>> So each line should have a different value of :align-to?
>
> If they each had a different value of :align-to, then I'd have to update
> those values of align-to every time text size or window size changes,
> which is something I want to avoid.
>
>> 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. If
> that's not possible with :align-to specs, then I'd use some other
> feature to implement the centering.
>
> As I mentioned in my initial email, it's entirely possible to center
> text in Emacs today, even by just inserting spaces. But that doesn't
> update automatically when text or window size changes; those spaces (or
> :align-to specs, in your proposal - they're basically the same) need to
> be updated by Lisp code running in post-command-hook or elsewhere, as
> you say.
>
> I want this centering display to be handled by the display engine, as
> other similar things are.
>
>
Instead of post-command-hook, you can use jit-lock: register a function that updates the display spec when text changes. That works fine in my experience. I don’t think the display engine can do what you want.
Yuan
next prev parent reply other threads:[~2021-04-14 13:42 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 [this message]
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
-- 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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