22 White on Black Panel Predicate
| (require mrlib/panel-wob) | package: gui-lib |
procedure
This predicate is intended to determine if the underlying
operating system is in a dark mode.
Under relatively recent versions of Mac OS, it queries dark mode directly. See also application-dark-mode-handler.
On other platforms, it determines if the foreground color of the panel background is lighter than the background color. If they appear to be the same, white-on-black-panel-scheme? returns #f.