Re: Dark mode on Windows

[Po Lu]

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>
+ #ifndef DWMWA_USE_IMMERSIVE_DARK_MODE
+ #define DWMWA_USE_IMMERSIVE_DARK_MODE 20
+ #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.