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bug#18739: 24.3; Request for a hook to be provided when scrolling will m
From: |
Stefan Monnier |
Subject: |
bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor |
Date: |
Thu, 16 Oct 2014 09:44:34 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux) |
>> >> It would be helpful to have a hook that would be called before any
>> >> scrolling command moves the cursor. In other words, I want to be
>> >> notified when an update to the display will force the location of
>> >> `point' to change in the current buffer.
>> > What's wrong with window-scroll-functions?
>> But these are also called when point is not affected, right?
> Yes. But it's easy to detect that situation, I think.
Is it?
I think the main reason why I ask is because I truly have no idea when
window-scroll-functions is called. You seem to be somewhat familiar
with it, so could you try and clarify it in the docstring?
Currently I see "List of functions to call before redisplaying a window
with scrolling" and "Note that these functions are also called by
`set-window-buffer'".
Here are some of the questions this brings up for me:
- is it called during set-window-buffer itself, or is it called in the
first redisplay after set-window-buffer?
- what means "redisplaying a window with scrolling" exactly? Does it
mean "redisplay with a different window-start then during the last
redisplay"? Does that include the case where window-start is changed
so as to follow point or is it only the cases where window-start was
changed explicitly by a scrolling command?
- how could a window-scroll-function distinguish the 3 cases:
"set-window-buffer", "used a scroll command", "moved point out of viewport".
I tried already a few times to understand window-scroll-functions, but
so far it has eluded me. FWIW, I found 3 kinds of uses:
- A crutch from when jit-lock didn't exist (in linum and lazy-lock).
- A way to try and keep a window fully empty showing only point-max by
calling set-window-start with the same window-start (in follow-mode).
Not clear exactly why this should work, and arguably goes against the
warning in window-scroll-functions's docstring.
- Do fancy auto-scrolling in eshell/em-smart (which does exactly what
window-scroll-functions's docstring warns not to do, AFAICT), calling
redisplay internally.
Stefan
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, (continued)
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Eli Zaretskii, 2014/10/15
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Josh Hunsaker, 2014/10/15
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Ivan Shmakov, 2014/10/15
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Eli Zaretskii, 2014/10/16
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Andreas Schwab, 2014/10/16
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Eli Zaretskii, 2014/10/16
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Andreas Schwab, 2014/10/16
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Eli Zaretskii, 2014/10/16
bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Stefan Monnier, 2014/10/15
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Eli Zaretskii, 2014/10/16
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor,
Stefan Monnier <=
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Josh, 2014/10/16
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Eli Zaretskii, 2014/10/16
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Josh, 2014/10/16
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Eli Zaretskii, 2014/10/16
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Josh, 2014/10/16
- bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Eli Zaretskii, 2014/10/16
bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Eli Zaretskii, 2014/10/16
bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Stefan Monnier, 2014/10/16
bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Josh, 2014/10/16
bug#18739: 24.3; Request for a hook to be provided when scrolling will move the cursor, Eli Zaretskii, 2014/10/16