From: Keith David Bershatsky <esq@lawlist.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 22404@debbugs.gnu.org
Subject: bug#22404: 25.1.50; Forcing `window-scroll-functions` to run.
Date: Tue, 19 Jan 2016 10:49:57 -0800 [thread overview]
Message-ID: <m2ziw19zfu.wl%esq@lawlist.com> (raw)
In-Reply-To: <m260yqdsp7.wl%esq@lawlist.com>
Thank you, Eli, for taking a look at this feature request.
The post-command-hook ("PCH") is only sufficient to return the correct window-start and window-end when no scrolling occurs. If I attach a function to the PCH that places overlays, then I would need to know programmatically with 100% certainty whether the window-scroll-functions ("WSF") will be running one or more times subsequent to the PCH. If the WSF will be running one or more times subsequent to the PCH, then I want to programmatically *prevent* overlays from being placed with the PCH -- i.e., so that they can instead be placed by the WSF. If the WSF will run more than once, then I want to wait until the last time it runs to place my overlays -- i.e., because start/end have changed since the first time WSF ran. E.g., point was partially visible and redisplay brings it into full vi
ew.
I was not able to come up with a 100% reliable test from the PCH that tells me whether WSF will be running one or more times subsequent thereto. So, I am using the following work-around to force the WSF to run all the time. The problem remaining is that I still need a reliable test to determine whether the WSF will be running more than once, so that I can delay my overlay function until the last call. The feature request is essentially: trigger WSF (similar to set-window-buffer), but there is no need to set-window-buffer and there is no need to run the window-configuration-change-hook. If there is any way you can think of to programmatically know with 100% certainty whether the WSF will be running more than one time, your help would be greatly appreciated.
(setq scroll-conservatively 101)
(defun pch-fn ()
(let ((window-configuration-change-hook nil))
(set-window-buffer (selected-window) (current-buffer) 'keep-margins)))
(add-hook 'post-command-hook 'pch-fn nil 'local)
(defun wsf-fn (win start)
(message "win: %s | start: %s | end: %s" win start (window-end win t)))
(add-hook 'window-scroll-functions 'wsf-fn nil 'local)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
At Tue, 19 Jan 2016 19:50:08 +0200,
Eli Zaretskii wrote:
>
> * * *
>
> Can you please tell more details about the problem you have? I;ve
> read this description several times, and couldn't figure out why are
> you having problems.
>
> For example, why can't you run your function from the
> post-command-hook directly? If you want it to run after all the hook
> functions finished, you can use the APPEND argument to add-hook,
> right?
>
> Or if the above somehow doesn't work, what about pre-command-hook?
>
> And those are just 2 random thoughts that went through my head while I
> was reading your request.
>
> Thanks.
next prev parent reply other threads:[~2016-01-19 18:49 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-19 5:49 bug#22404: 25.1.50; Forcing `window-scroll-functions` to run Keith David Bershatsky
2016-01-19 17:50 ` Eli Zaretskii
2016-01-19 18:49 ` Keith David Bershatsky [this message]
2016-01-19 19:39 ` Eli Zaretskii
2016-01-19 18:53 ` John Wiegley
2016-01-19 19:26 ` Keith David Bershatsky
2016-01-19 20:35 ` Keith David Bershatsky
2016-01-20 13:34 ` Eli Zaretskii
2016-01-19 23:07 ` Keith David Bershatsky
2016-01-21 2:32 ` Keith David Bershatsky
2016-01-21 17:41 ` Eli Zaretskii
2016-01-21 19:54 ` Keith David Bershatsky
2016-01-21 20:28 ` Eli Zaretskii
2016-01-29 12:00 ` Michael Heerdegen
2016-01-29 14:37 ` Eli Zaretskii
2016-01-29 14:57 ` Michael Heerdegen
2016-01-29 15:33 ` Eli Zaretskii
2016-01-21 21:11 ` Keith David Bershatsky
2016-01-29 2:14 ` John Wiegley
2016-01-29 3:08 ` Keith David Bershatsky
2016-01-29 8:42 ` Eli Zaretskii
2016-01-29 15:54 ` Keith David Bershatsky
2016-02-01 3:50 ` Keith David Bershatsky
2016-02-01 19:54 ` Eli Zaretskii
2016-02-01 13:18 ` Keith David Bershatsky
2016-02-02 16:34 ` Eli Zaretskii
2016-02-02 5:58 ` Keith David Bershatsky
2016-02-02 18:16 ` Keith David Bershatsky
2016-02-02 18:43 ` Eli Zaretskii
2016-02-02 20:00 ` Keith David Bershatsky
2016-02-02 21:05 ` Keith David Bershatsky
2016-02-08 8:51 ` Keith David Bershatsky
2016-02-08 17:17 ` Eli Zaretskii
2016-02-09 16:00 ` Keith David Bershatsky
2016-02-09 17:48 ` Eli Zaretskii
2016-02-12 0:14 ` Keith David Bershatsky
2016-02-12 8:18 ` Eli Zaretskii
2016-02-16 3:39 ` Keith David Bershatsky
2016-02-22 6:05 ` Keith David Bershatsky
2016-03-11 16:21 ` Keith David Bershatsky
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