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* lisp/pixel-scroll.el: Update commentary.

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Po Lu 2022-02-05 19:48:23 +08:00
parent 4243747b1b
commit 63eab2948a
1 changed files with 23 additions and 2 deletions
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lisp/pixel-scroll.el
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@ -32,8 +32,10 @@
;;; Commentary:
;; This package offers a global minor mode which makes mouse-wheel
;; scroll a line smoothly.
;; This file contains two somewhat related features.
;; The first is a global minor mode which makes Emacs try to scroll
;; each line smoothly.
;;
;; Scrolling a line up by `set-window-vscroll' and that by `scroll-up'
;; give similar display as shown below.
@ -58,6 +60,25 @@
;; (set-window-vscroll nil vs t) (sit-for 0))
;; (scroll-up 1)
;; The second is another global minor mode that redefines `wheel-up'
;; and `wheel-down' to a command that tries to scroll the display
;; according to the precise movement of a trackpad or mouse.
;; But it operates in a much more intelligent manner than simply
;; setting the vscroll. It will set window start to the position
;; closest to the position at the top-left corner of the window if
;; vscroll were set accordingly, in a smart and fast manner, and only
;; set vscroll the rest of the way. There is no visible difference,
;; but it is much faster, and doesn't move the display by a huge
;; portion if vscroll is reset for some reason.
;; It also tries to move point out of the way, so redisplay will not
;; recenter the display as it scrolls. This works well almost all of
;; the time, but is impossible to get right with images larger than
;; the window they're displayed in. A feature that will allow
;; redisplay to skip recentering is in the works, and will completely
;; resolve this problem.
;;; Todo:
;;
;; Allowing pixel-level scrolling in Emacs requires a thorough review