Variable: tooltip-functions
tooltip-functions is a variable defined in tooltip.el.gz.
Value
nil
Documentation
Functions to call to display tooltips.
Each function is called with one argument EVENT which is a copy of the last mouse movement event that occurred. If one of these functions displays the tooltip, it should return non-nil and the rest are not called.
Source Code
;; Defined in /usr/src/emacs/lisp/tooltip.el.gz
;;; Variables that are not customizable.
(defvar tooltip-functions nil
"Functions to call to display tooltips.
Each function is called with one argument EVENT which is a copy
of the last mouse movement event that occurred. If one of these
functions displays the tooltip, it should return non-nil and the
rest are not called.")