GNU bug report logs - #53458
[Request, Linux] Follow system dark mode user preference

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Package: emacs; Reported by: Maximiliano Sandoval <msandova@HIDDEN>; dated Sat, 22 Jan 2022 22:15:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Po Lu <luangruo@HIDDEN>
To: Rudolf Schlatte <rudi@HIDDEN>
Subject: Re: bug#53458: [Request, Linux] Follow system dark mode user
 preference
References: <3iRhN5EFJnIdFLuFt_CnYryIAZSjHpoq96ZkkxYkI1DJS4cNYRyGd18E92AH1lTjuEY75njusiICZbdF_AD0brAkLZ_9o9Gk435hsZbXiho=@protonmail.com>
 <87wnirryve.fsf@HIDDEN> <m18rv6k94b.fsf@HIDDEN>
Date: Sun, 23 Jan 2022 21:14:50 +0800
In-Reply-To: <m18rv6k94b.fsf@HIDDEN> (Rudolf Schlatte's message of
 "Sun, 23 Jan 2022 12:02:44 +0100")
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Rudolf Schlatte <rudi@HIDDEN> writes:

> The OS changes the title bar color etc., but such a change would let
> Emacs adapt frame contents, for example by changing the active theme.

For Emacs to change the GTK stylesheet when the system tells it to over
the XDG portal API doesn't mean it will necessarily be possible for Lisp
programs to obtain the name of the stylesheet being utilized, but I
think something like what Carbon Emacs has would be a good idea.

I'm not convinced that implementing the former is a good idea, since
changing the decoration style should be (and will probably be in the
future) handled by either GTK+ or the window manager, while these
standards come and go, but I am not opposed to the latter.

Patches welcome, thanks.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#53458; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Rudolf Schlatte <rudi@HIDDEN>
Subject: Re: bug#53458: [Request,
 Linux] Follow system dark mode user preference
Date: Sun, 23 Jan 2022 12:02:44 +0100
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Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs@HIDDEN> writes:

> Maximiliano Sandoval <msandova@HIDDEN> writes:
>
>> Recently a new setting was added to xdg-desktop-portal to declare the user
>> preference for a dark mode. This setting is DE-agnostic┬╣ and it is sandbox
>> friendly. The dark mode setting will be officially supported in GNOME 42,
>> elementary OS already supports it, and there is a merge request for KDE that
>> will most likely included its next release.
>>
>> How to implement
>
> Isn't the window manager and GTK+ responsible for this, and not the
> applications themselves?

The OS changes the title bar color etc., but such a change would let
Emacs adapt frame contents, for example by changing the active theme.
To give a concrete example, I have the snippet below in my init file,
evaluated when I'm running Yamamoto-san's Mac port:

  (add-hook 'mac-effective-appearance-change-hook
            #'(lambda () (pcase (plist-get (mac-application-state) :appearance)
                           ("NSAppearanceNameDarkAqua" (modus-themes-load-vivendi))
                           ("NSAppearanceNameAqua" (modus-themes-load-operandi))))) 







Information forwarded to bug-gnu-emacs@HIDDEN:
bug#53458; Package emacs. Full text available.

Message received at 53458 <at> debbugs.gnu.org:


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From: Po Lu <luangruo@HIDDEN>
To: Maximiliano Sandoval <msandova@HIDDEN>
Subject: Re: bug#53458: [Request, Linux] Follow system dark mode user
 preference
References: <3iRhN5EFJnIdFLuFt_CnYryIAZSjHpoq96ZkkxYkI1DJS4cNYRyGd18E92AH1lTjuEY75njusiICZbdF_AD0brAkLZ_9o9Gk435hsZbXiho=@protonmail.com>
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Maximiliano Sandoval <msandova@HIDDEN> writes:

> Recently a new setting was added to xdg-desktop-portal to declare the user
> preference for a dark mode. This setting is DE-agnostic=C2=B9 and it is s=
andbox
> friendly. The dark mode setting will be officially supported in GNOME 42,
> elementary OS already supports it, and there is a merge request for KDE t=
hat
> will most likely included its next release.
>
> How to implement

Isn't the window manager and GTK+ responsible for this, and not the
applications themselves?




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#53458; Package emacs. Full text available.

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From: Maximiliano Sandoval <msandova@HIDDEN>
Subject: [Request, Linux] Follow system dark mode user preference
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Recently a new setting was added to xdg-desktop-portal to declare the user
preference for a dark mode. This setting is DE-agnostic=C2=B9 and it is san=
dbox
friendly. The dark mode setting will be officially supported in GNOME 42,
elementary OS already supports it, and there is a merge request for KDE tha=
t
will most likely included its next release.

How to implement: Emacs has to read via dbus the value of the setting and l=
isten
for changes, then (if using a GtkHeaderBar) set the value of
GtkSetting:gtk-application-prefer-dark-theme so that the header bar/title b=
ar of
emacs follows the preference. Ideally there could be `color-scheme` variabl=
e for
which the user can set values

 * prefer-light
 * prefer-dark
 * follow-system

and a `is-dark-mode` variable so that users can read its value and add hook=
s to
it.

Note that desktops environments might add dark/light mode schedulers based =
on
the time of the day, so it is important to be able to set hooks and listen =
to
the dbus for changes of the setting.

Relevant devel discussions:

- https://lists.gnu.org/archive/html/emacs-devel/2021-10/msg01737.html
- https://lists.gnu.org/archive/html/emacs-devel/2021-03/msg00482.html

Relevant material:

- Freedesktop spec: https://flatpak.github.io/xdg-desktop-portal/#gdbus-org=
.freedesktop.portal.Settings
- GNOME Dark mode initiative: https://gitlab.gnome.org/GNOME/Initiatives/-/=
issues/32
- C example (taken from the initiative): https://gitlab.gnome.org/GNOME/Ini=
tiatives/-/wikis/uploads/b590f6ee98c68b652d95708f707ce927/hello.c

--
Maximiliano




Acknowledgement sent to Maximiliano Sandoval <msandova@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#53458; Package emacs. Full text available.
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