From: Po Lu <luangruo@yahoo.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: Allowing point to be outside the window?
Date: Sun, 05 Dec 2021 08:40:51 +0800 [thread overview]
Message-ID: <87mtlfubn0.fsf@yahoo.com> (raw)
In-Reply-To: <83mtlg5oeq.fsf@gnu.org> (Eli Zaretskii's message of "Sat, 04 Dec 2021 18:24:13 +0200")
Eli Zaretskii <eliz@gnu.org> writes:
> Which commands did you try in addition to goto-char? What about
> scrolling commands?
I haven't worked on any of the scrolling commands yet: they still keep
point inside the window.
>> The idea is that if `set_cursor_from_row' returns false (say if the
>> cursor was not found to be in the row), w->cursor_visible will also be
>> set to false.
> But you are just wasting cycles that way. When it is known that point
> is outside of the window, that function will end up being called for
> every screen line we lay out. Instead, just set the result without
> calling it in those cases.
>> I don't understand why set_cursor_from_row should be disabled though:
>> isn't it responsible for placing the cursor on the display (and as such,
>> isn't it required for the cursor to be displayed when point is _inside_
>> the window?).
> Yes. I meant when you know that point is outside of the window.
Thanks, I understand your point now.
>> Doesn't `try_scrolling' try to constrain point inside if it is too near
>> the end of the window?
> Among other things, yes. But its main purpose is not to move point,
> it's to find a suitable window-start position.
Thanks.
>> (And isn't the optimization that tries to decide whether or not to
>> blit the display if appropriate `scrolling_window' in dispextern.c?)
> scrolling_window belongs to the second phase of a redisplay cycle,
> where we actually deliver glyphs to the glass. try_scrolling is from
> the first phase, where we decide what should be on the glass.
>
> In any case, both try_scrolling and scrolling_window are not about
> bringing point back into view, they are about redrawing the window so
> that it correctly reflects the buffer contents. So these functions
> cannot and shouldn't be bypassed, even in this mode.
>
>> > The condition above doesn't check the keep_point_visible flag, why?
>> w->cursor_visible_p should always be true if keep_point_visible is not
>> nil by the time we get there.
> There should be a comment there about this, and perhaps also an
> assertion.
Okay, I will do that. Thanks.
next prev parent reply other threads:[~2021-12-05 0:40 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <87ilwd7zaq.fsf.ref@yahoo.com>
2021-11-28 3:07 ` Allowing point to be outside the window? Po Lu
2021-11-28 8:03 ` Eli Zaretskii
2021-11-28 8:13 ` Po Lu
2021-11-28 8:41 ` Eli Zaretskii
2021-11-28 12:47 ` Po Lu
2021-11-28 12:58 ` Eli Zaretskii
2021-11-28 13:10 ` Po Lu
2021-11-28 13:44 ` Eli Zaretskii
2021-11-29 1:47 ` Po Lu
2021-11-29 13:00 ` Eli Zaretskii
2021-11-29 13:22 ` Po Lu
2021-11-29 13:43 ` Eli Zaretskii
2021-11-30 1:40 ` Po Lu
2021-11-30 16:49 ` [External] : " Drew Adams
2021-11-30 17:26 ` Eli Zaretskii
2021-11-30 18:10 ` Lars Ingebrigtsen
2021-11-30 18:32 ` Eli Zaretskii
2021-11-30 18:49 ` Stefan Kangas
2021-11-30 19:21 ` Eli Zaretskii
2021-11-30 20:57 ` Drew Adams
2021-11-30 23:41 ` Daniel Martín
2021-12-01 8:30 ` martin rudalics
2021-12-01 9:10 ` Juri Linkov
2021-11-30 23:20 ` Stefan Monnier
2021-12-04 11:18 ` Po Lu
2021-12-04 12:55 ` Eli Zaretskii
2021-12-04 13:13 ` Po Lu
2021-12-04 16:24 ` Eli Zaretskii
2021-12-05 0:40 ` Po Lu [this message]
2021-12-04 17:15 ` Eli Zaretskii
2021-12-05 0:45 ` Po Lu
2021-12-05 9:03 ` Eli Zaretskii
2021-12-06 2:11 ` Po Lu
2021-12-06 14:13 ` Eli Zaretskii
2021-12-07 2:18 ` Po Lu
2021-12-07 13:42 ` Eli Zaretskii
2021-12-08 1:17 ` Po Lu
2021-12-08 17:14 ` Eli Zaretskii
2021-12-09 0:23 ` Po Lu
2021-12-09 8:02 ` Eli Zaretskii
2021-12-09 9:22 ` Po Lu
2021-12-09 10:02 ` Eli Zaretskii
2021-12-25 6:45 ` Po Lu
2021-12-25 7:07 ` Eli Zaretskii
2022-02-06 7:22 ` Po Lu
2022-02-06 11:34 ` Eli Zaretskii
2022-02-06 11:46 ` Po Lu
2022-02-06 11:55 ` Eli Zaretskii
2022-02-06 12:21 ` Po Lu
2022-02-06 16:15 ` Eli Zaretskii
2022-02-07 1:21 ` Po Lu
2022-02-07 7:21 ` Po Lu
2022-02-07 13:41 ` Eli Zaretskii
2022-02-07 13:57 ` Po Lu
2022-02-07 14:24 ` Eli Zaretskii
2022-02-08 0:58 ` Po Lu
2022-02-08 17:08 ` Eli Zaretskii
2022-02-09 1:57 ` Po Lu
2022-02-10 13:04 ` Eli Zaretskii
2022-02-10 13:09 ` Po Lu
2021-12-09 11:45 ` Eli Zaretskii
2021-12-09 12:19 ` Po Lu
2021-12-09 12:45 ` Eli Zaretskii
2021-12-04 13:00 ` dick
2021-12-04 13:14 ` tomas
2021-12-04 13:19 ` Po Lu
2021-12-04 13:41 ` Eli Zaretskii
2021-12-05 0:46 ` Po Lu
2021-12-05 7:12 ` Eli Zaretskii
2021-12-05 7:16 ` Po Lu
2021-12-05 8:48 ` Eli Zaretskii
2021-12-05 9:15 ` Po Lu
2021-12-05 9:25 ` Eli Zaretskii
2021-12-05 9:31 ` Po Lu
2021-12-05 10:34 ` Eli Zaretskii
2021-12-05 10:37 ` Po Lu
2021-12-04 14:17 ` dick
2021-12-04 16:33 ` Eli Zaretskii
2021-12-04 17:13 ` dick
2021-12-05 0:48 ` Po Lu
2021-11-28 14:03 ` Alan Mackenzie
2021-11-28 14:28 ` Eric S Fraga
2021-11-28 14:39 ` Eli Zaretskii
2021-11-28 16:55 ` Eric S Fraga
2021-11-28 14:42 ` dick
2021-11-28 15:39 ` Kévin Le Gouguec
2021-11-28 15:45 ` Eli Zaretskii
2021-11-28 17:14 ` Kévin Le Gouguec
2021-11-28 16:59 ` Eric S Fraga
2021-11-28 17:30 ` Kévin Le Gouguec
2021-11-29 0:34 ` Dmitry Gutov
2021-11-29 0:34 ` Po Lu
2021-12-08 1:45 ` John Ankarström
2021-12-08 12:45 ` Eli Zaretskii
2021-12-08 13:33 ` John Ankarström
2021-12-08 13:38 ` Po Lu
2021-12-08 13:52 ` John Ankarström
2021-12-08 14:26 ` Eli Zaretskii
2021-12-08 16:57 ` Stefan Monnier
2021-12-08 19:29 ` Yuri Khan
2021-12-09 0:16 ` Po Lu
2021-12-08 19:21 ` Rudolf Schlatte
2021-12-08 19:56 ` Juri Linkov
2021-12-08 20:05 ` André A. Gomes
2021-12-08 20:31 ` Linux console scrollback [ Was: Allowing point to be outside the window? ] Alan Mackenzie
2021-12-09 0:17 ` Allowing point to be outside the window? Po Lu
2021-12-08 22:25 ` Kévin Le Gouguec
2021-12-08 23:17 ` John Ankarström
[not found] <9603C99D-97E7-4285-A1C1-022191B6F5CC@univie.ac.at>
2021-12-08 18:43 ` Konrad Podczeck
2021-12-08 20:47 ` John Ankarström
2021-12-09 15:34 Konrad Podczeck
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