Subject: Re: bug#68766: 29.2; Windows dark/light mode changes does not reflect on Emacs Title bar/Scrollbar

From: Eli Zaretskii <[email-masked]>
Date: Tue, 30 Jan 2024 15:15:04 +0200

> From: Rudolf Schlatte <[email-masked]>
> Date: Tue, 30 Jan 2024 12:57:45 +0100
> 
> Stefan Kangas <[email-masked]> writes:
> 
> > Eli Zaretskii <[email-masked]> writes:
> >
> >> It's "by design", in the sense that this is how the Dark theme support
> >> is implemented in Emacs.  If someone submits changes to react to theme
> >> change immediately for all the frames, we can consider that for
> >> inclusion.
> >
> > I think that would be a useful feature, indeed.
> >
> > AFAIU, the point of light/dark mode for many users is that they want to
> > use different settings depending on the time of day.  This needs the
> > Emacs frame to react to it when the time switches (as most programs in
> > desktop environments like Gnome, or even macOS, do).
> 
> This is what I have in my init file, conditionalized on (eq
> window-system 'mac).  It's not the nicest API, but maybe serves as an
> inspiration for a better-designed, more general hook.
> 
> (add-hook 'mac-effective-appearance-change-hook
>              #'(lambda () (pcase (plist-get (mac-application-state) :appearance)
>                             ("NSAppearanceNameDarkAqua" (load-theme 'ef-night t))
>                             ("NSAppearanceNameAqua" (load-theme 'ef-frost t)))))

Thanks, but the original report was about MS-Windows, not macOS.