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Diffstat (limited to 'lisp/scroll-bar.el')
| -rw-r--r-- | lisp/scroll-bar.el | 7 |
1 files changed, 7 insertions, 0 deletions
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, |