From: Eli Zaretskii <eliz@gnu.org>
To: Keith David Bershatsky <esq@lawlist.com>
Cc: 22404@debbugs.gnu.org
Subject: bug#22404: 25.1.50; Forcing `window-scroll-functions` to run.
Date: Tue, 19 Jan 2016 19:50:08 +0200 [thread overview]
Message-ID: <83mvs1bgrz.fsf@gnu.org> (raw)
In-Reply-To: <m260yqdsp7.wl%esq@lawlist.com> (message from Keith David Bershatsky on Mon, 18 Jan 2016 21:49:40 -0800)
> Date: Mon, 18 Jan 2016 21:49:40 -0800
> From: Keith David Bershatsky <esq@lawlist.com>
>
> As a feature request, please consider adding an alternative method to force the `window-scroll-functions` hook to run -- but NOT more than it would normally run. [In other words, it shouldn't run 3 times.] I only found `(set-window-buffer (selected-window) (current-buffer))` as a viable means to achieve this goal. `run-window-scroll-functions` runs immediately and is not a viable substitute for this feature request. Some users may not wish to `set-window-buffer` or run the `window-configuration-change-hook` to achieve this feature request.
>
> In my particular use case, I want to run a custom function only one time per command loop that is dependent upon the new `window-start` and `window-end`, which is only reliably available to the user after the `post-command-hook` has run its course. My function is too costly time-wise to run more than once each command loop. I have tried, to no avail, to come up with a test to ascertain with 100% accuracy (from the `post-command-hook`) to guess whether the `window-scroll-functions` hook will run and/or whether it will run more than one time (e.g., when cursor/point is partially visible). I played around with `(pos-visible-in-window-p nil nil t)` and whether it returned a length of 0, 2 or 6 -- however, from the `post-command-hook`, that is insufficient to ascertain with 100% accuracy w
hether the `window-scroll-functions` hook will run once or twice or not at all. The solution, I believe, is to force the `window-scroll-functions` hook to run during every redisplay -- but not more than it would normally run.
>
> In other words, I want the `window-scroll-functions` hook to run every command loop when my custom minor-mode is active -- or twice if point/cursor is only partially visible (at the bottom of the window) and needs to be moved up a smidgen by redisplay.
>
> Background: my custom function is a cross-hairs created with overlays that works with `word-wrap` -- the vertical line is XPM that matches the character and color underneath.
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 17:50 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 [this message]
2016-01-19 18:49 ` Keith David Bershatsky
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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