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* bug#57526: 29.0.50; Precise pixel-scrolling works great with touchpad but not with mouse wheel
@ 2022-09-01 13:48 Tassilo Horn
  2022-09-02  1:15 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
  0 siblings, 1 reply; 9+ messages in thread
From: Tassilo Horn @ 2022-09-01 13:48 UTC (permalink / raw)
  To: 57526


1. emacs -Q
2. In *scratch* evaluate

(pixel-scroll-mode 1)
(setq pixel-scroll-precision-use-momentum t)
(pixel-scroll-precision-mode 1)

The result for me is that scrolling with my notebook's touchpad is
precise and uses momentum.  But scrolling with the mouse wheel seems to
scroll about 8 lines with each "click" of the wheel in one redisplay (so
it's not smooth at all) and there seems to be no momentum (which is
probably correct because the wheel doesn't give the ability to stop
momentum scrolling).  C-h k reports that wheel-down/up are bound to
pixel-scroll-precision.  On the touchpad it seems next to wheel-down/up
events a final touch-end event is generated starting the momentum
scrolling.

The reason for the difference is that the EVENTs passed to
pixel-scroll-precision have very different delta values.  The touchpad
events command emacs to scroll about 20 pixels, the mouse wheel events
command it to scroll 150 pixels.

I see there's some interpolation feature which might be relevant but I
don't get into that code path because (device-class last-event-frame
last-event-device) returns core-keyboard instead of mouse.  I get that
value in both the case where I scrolled using touchpad as well as mouse.
When I typed something with the real keyboard, it says just keyboard.


In GNU Emacs 29.0.50 (build 13, x86_64-pc-linux-gnu, GTK+ Version
 3.24.34, cairo version 1.17.6) of 2022-09-01 built on thinkpad-t440p
Repository revision: 67b85decc7702c24f2904e60e3eecfc2bfca5ab6
Repository branch: master
System Description: Arch Linux

Configured using:
 'configure --with-pgtk --with-native-compilation --with-xinput2'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS WEBP XIM GTK3 ZLIB

Important settings:
  value of $LC_MONETARY: de_DE.utf8
  value of $LC_NUMERIC: de_DE.utf8
  value of $LC_TIME: de_DE.utf8
  value of $LANG: en_US.UTF-8
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Major mode: ELisp/l

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  column-number-mode: t
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  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2022-09-03  7:04 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-09-01 13:48 bug#57526: 29.0.50; Precise pixel-scrolling works great with touchpad but not with mouse wheel Tassilo Horn
2022-09-02  1:15 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-09-02  4:57   ` Tassilo Horn
2022-09-02  9:30     ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-09-02 11:41       ` Tassilo Horn
2022-09-02 12:33         ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-09-02 12:39           ` Tassilo Horn
2022-09-03  1:04             ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-09-03  7:04               ` Tassilo Horn

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