From: Eli Zaretskii <eliz@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: Correct way to implement `pixel-point-and-height-at-unseen-line'?
Date: Tue, 14 Dec 2021 15:30:44 +0200 [thread overview]
Message-ID: <83bl1jl3ej.fsf@gnu.org> (raw)
In-Reply-To: <87czm0uifx.fsf@yahoo.com> (message from Po Lu on Tue, 14 Dec 2021 08:41:06 +0800)
> From: Po Lu <luangruo@yahoo.com>
> Cc: help-gnu-emacs@gnu.org
> Date: Tue, 14 Dec 2021 08:41:06 +0800
>
> Eli Zaretskii <eliz@gnu.org> writes:
>
> > And you didn't describe why do you need
> > pixel-point-and-height-at-unseen-line's data in the first place, so
> > maybe there's a different solution to whatever you are trying to do
> > that doesn't involve such a function.
>
> It's used to find a suitable new start position that's N pixels above
> window start, so vscroll can then be set to compensate for the
> difference.
Did you try something like this:
(save-excursion
(goto-char (window-start))
(vertical-motion (- (ceiling N (frame-char-height))))
(point))
where N is your number of pixels?
next prev parent reply other threads:[~2021-12-14 13:30 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <87pmq1wag9.fsf.ref@yahoo.com>
2021-12-13 1:38 ` Correct way to implement `pixel-point-and-height-at-unseen-line'? Po Lu
2021-12-13 2:20 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-12-13 2:49 ` Po Lu
2021-12-13 3:04 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-12-13 3:18 ` Po Lu
2021-12-13 23:41 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-12-14 0:41 ` Po Lu
2021-12-13 14:32 ` Eli Zaretskii
2021-12-14 0:41 ` Po Lu
2021-12-14 13:30 ` Eli Zaretskii [this message]
2021-12-14 13:48 ` Po Lu
2021-12-14 14:26 ` Eli Zaretskii
2021-12-15 0:40 ` Po Lu
2021-12-15 13:11 ` Eli Zaretskii
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