From: Tak Kunihiro <tkk@misasa.okayama-u.ac.jp>
To: eliz@gnu.org
Cc: tkk@misasa.okayama-u.ac.jp, emacs-devel@gnu.org
Subject: Re: line-pixel-height beyond eol
Date: Wed, 13 Sep 2017 09:24:30 +0900 (JST) [thread overview]
Message-ID: <20170913.092430.784440060052023776.tkk@misasa.okayama-u.ac.jp> (raw)
In-Reply-To: <83a820q7a3.fsf@gnu.org>
Thank you for the response.
>> Is there a way to obtain the height in pixels of the line at the `hollow’
>> point in the selected window? Or is there a way to maintain the height of
>> a line even when an image is horizontally scrolled out?
>
> I don't think I understand what value you want to obtain. Can you
> elaborate, and perhaps also explain what do you want to do with that
> value and why?
With Eww, I often meet pages with wide images. I want to scroll
pixel-wisely the buffers with auto-hscroll-mode off even when
(current-column) is a large number.
The building block of pixel-wise scrolling is described as below.
(progn (vertical-motion 1)
(dolist (vs (number-sequence 1 (1- (frame-char-height))))
(set-window-vscroll nil vs t) (sit-for 0.01))
(scroll-up 1))
To determine when to flush in a buffer of lines with different height,
I have to know
- height of line in pixel of the top line on screen.
I think that, on XXX condition, I rather should obtain it as
frame-char-height instead of line-pixel-height. I cannot find how to
describe the XXX condition.
Also, to avoid unexpected jump, I want to calculate margin to move the
`hollow’ cursor by vertical-motion. Here the `hollow’ cursor is
defined as a cursor shown up when (current-column) is large, that can
go over the end of line. I want to know following two valuse, that
are
- height of line in pixel where the `hollow’ cursor is
- y position of the `hollow’ cursor instead of (cdr (posn-x-y (posn-at-point))).
I have no idea how to get those.
Please give me suggestions!
next prev parent reply other threads:[~2017-09-13 0:24 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-12 10:12 line-pixel-height beyond eol Tak Kunihiro
2017-09-12 15:13 ` Eli Zaretskii
2017-09-13 0:24 ` Tak Kunihiro [this message]
2017-09-13 15:28 ` Eli Zaretskii
2017-09-13 23:14 ` Tak Kunihiro
2017-09-14 17:53 ` Eli Zaretskii
2017-09-15 1:39 ` Tak Kunihiro
2017-09-15 17:35 ` Eli Zaretskii
2017-09-23 12:57 ` Tak Kunihiro
2017-09-23 13:16 ` Eli Zaretskii
2017-10-05 9:50 ` Tak Kunihiro
2017-10-09 13:31 ` Eli Zaretskii
2017-10-16 5:13 ` Tak Kunihiro
2017-10-16 16:16 ` Eli Zaretskii
2017-10-17 0:29 ` Tak Kunihiro
2017-10-17 16:37 ` Eli Zaretskii
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