From: Arthur Miller <arthur.miller@live.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 52129@debbugs.gnu.org
Subject: bug#52129: 29.0.50; Wish: Extend `:align-to center' to work on lines in buffer
Date: Sun, 28 Nov 2021 00:40:30 +0100 [thread overview]
Message-ID: <AM9PR09MB49779B141211D1DBDD61CFDB96649@AM9PR09MB4977.eurprd09.prod.outlook.com> (raw)
In-Reply-To: <83r1b1zvqe.fsf@gnu.org> (Eli Zaretskii's message of "Sat, 27 Nov 2021 13:25:13 +0200")
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Arthur Miller <arthur.miller@live.com>
>> Cc: 52129@debbugs.gnu.org
>> Date: Sat, 27 Nov 2021 12:06:19 +0100
>>
>> > No, I mean to put this property:
>> >
>> > 'display '(space :align-to center)
>> >
>> > on a space character (or any other character, which will not be
>> > displayed) that is prepended to the time-stamp-string you want to
>> > display.
>>
>> Aha, like this?:
>>
>> (defun evc--time ()
>> (concat (propertize " " 'display '(space :align-to center))
>> (propertize
>> (time-stamp-string " %H:%M") 'face evc--time-face)))
>>
>> That still seems to be dependanble on when the time string is inserted? Because
>> when I test to insert like this:
>>
>> (defun evc--update ()
>> (let ((time (evc--time))
>> (date (evc--date)))
>> (when (frame-live-p evc--frame)
>> (select-frame evc--frame))
>> (with-current-buffer evc--buffer
>> (erase-buffer)
>> (insert time "\n" date)
>> (goto-char 1))))
>>
>> the string is not centered correctly; there is ~70 pixels difference between
>> left and right margins.
>
> That's because it centers the first character of the string, not its
> middle character.
That too; so you see, it is not as simple to get it right by just prepending a
space with :align-to center property.
>> Is there any way to make it aware of surrounding context, like entire line? Or
>> would that be too demanding computationally?
>
> I don't think I understand what you mean by "surrounding context", and
> what would it mean for it to "be aware" of it?
With context I meant simply the line, or at least part of the line to be
displayed. To be aware of it = to take it into consideration when displaying
line, so things like suggested would be possible.
next prev parent reply other threads:[~2021-11-27 23:40 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-26 20:01 bug#52129: 29.0.50; Wish: Extend `:align-to center' to work on lines in buffer Arthur Miller
2021-11-27 5:59 ` Eli Zaretskii
2021-11-27 8:47 ` Arthur Miller
2021-11-27 9:15 ` Eli Zaretskii
2021-11-27 11:06 ` Arthur Miller
2021-11-27 11:25 ` Eli Zaretskii
2021-11-27 23:40 ` Arthur Miller [this message]
2021-11-28 7:48 ` Eli Zaretskii
2021-11-28 10:38 ` Arthur Miller
2021-11-29 15:59 ` Lars Ingebrigtsen
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