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Re: Dark mode on Windows

From: Po Lu
Subject: Re: Dark mode on Windows
Date: Mon, 25 Oct 2021 09:22:31 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Po Lu <luangruo@yahoo.com> writes:

> Is this feature available on free operating systems?
> The X11+GTK port, which runs on free operating systems, needs this
> feature.
> P.S. this is also a problem with the NS port.  The ability to use a dark
> stylesheet for window decorations is only available on macOS, and not
> GNUstep.

Some other comments:

+    # darkmode
+    W32_LIBS="$W32_LIBS -ldwmapi"
+    # darkmode

This will not work on Windows NT prior to NT 6.0, or any version of
Windows 9x.

+ /* darkmode */
+ #include <dwmapi.h>
+ #endif
+ /* darkmode */

What is the purpose of this define?  Is `DWMWA_USE_IMMERSIVE_DARK_MODE'
an undocumented feature?

+      /* Enable darkmode */
+      BOOL isDarkMode = TRUE;
+      DwmSetWindowAttribute(hwnd,
+                           DWMWA_USE_IMMERSIVE_DARK_MODE,
+                           &isDarkMode,
+                           sizeof(isDarkMode));

This needs to be controllable by the user, and will similarly not work
on slightly old versions of Windows.

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