Name
make-toggling-winop -- Returns a procedure which takes a window WIN and toggles a property of it.
Synopsis
(make-toggling-winop pred neg pos)
Description
Returns a procedure which takes a window WIN and toggles a property of it.
PRED, NEG, and POS should be functions which take a window and
check whether the property holds for the window, reset the property
on the window, and set the property on the window, respectively.