From: Richard M. Stallman <rms@gnu.org>
Date: Sat, 30 Apr 1994 07:23:15 +0000 (+0000)
Subject: (scroll-bar-event-ratio): New function.
X-Git-Tag: emacs-19.34~8631
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=8682867842d9cdf5d800cdf306eaaf5a578f96fe;p=emacs.git

(scroll-bar-event-ratio): New function.
---

diff --git a/lisp/scroll-bar.el b/lisp/scroll-bar.el
index 462fdad55ae..181e02999e7 100644
--- a/lisp/scroll-bar.el
+++ b/lisp/scroll-bar.el
@@ -34,6 +34,13 @@
 
 ;;;; Utilities.
 
+(defun scroll-bar-event-ratio (event)
+  "Given a scroll bar event EVENT, return the scroll bar position as a ratio.
+The value is a cons cell (PORTION . WHOLE) containing two integers
+whose ratio gives the event's vertical position in the scroll bar, with 0
+referring to the top and 1 to the bottom."
+  (nth 2 event))
+
 (defun scroll-bar-scale (num-denom whole)
   "Given a pair (NUM . DENOM) and WHOLE, return (/ (* NUM WHOLE) DENOM).
 This is handy for scaling a position on a scroll bar into real units,