[gsettings-desktop-schemas/wip/exalm/dark: 29/30] Add color-scheme setting

[Alexander Mikhaylenko <alexm src gnome org>]

commit e3c2c421d78a8bfff466ad2180781cbaacce0319
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Sun Sep 19 21:32:59 2021 +0500

    Add color-scheme setting
    
    This will be used to implement a system-wide dark preference.

 headers/gdesktop-enums.h                           | 7 +++++++
 schemas/org.gnome.desktop.interface.gschema.xml.in | 7 +++++++
 2 files changed, 14 insertions(+)
---
diff --git a/headers/gdesktop-enums.h b/headers/gdesktop-enums.h
index dac464b..e67e0f7 100644
--- a/headers/gdesktop-enums.h
+++ b/headers/gdesktop-enums.h
@@ -251,4 +251,11 @@ typedef enum
   G_DESKTOP_FONT_RGBA_ORDER_VBGR,
 } GDesktopFontRgbaOrder;
 
+typedef enum
+{
+  G_DESKTOP_COLOR_SCHEME_DEFAULT,
+  G_DESKTOP_COLOR_SCHEME_PREFER_DARK,
+  G_DESKTOP_COLOR_SCHEME_PREFER_LIGHT,
+} GDesktopColorScheme;
+
 #endif /* __gdesktop_enums_h__ */
diff --git a/schemas/org.gnome.desktop.interface.gschema.xml.in 
b/schemas/org.gnome.desktop.interface.gschema.xml.in
index 2e3554a..a998708 100644
--- a/schemas/org.gnome.desktop.interface.gschema.xml.in
+++ b/schemas/org.gnome.desktop.interface.gschema.xml.in
@@ -294,5 +294,12 @@
        The order of subpixel elements on an LCD screen; only used when antialiasing is set to “rgba”. 
Possible values are: “rgb” for red on left (most common), “bgr” for blue on left, “vrgb” for red on top, 
“vbgr” for red on bottom.
       </description>
     </key>
+    <key name="color-scheme" enum="org.gnome.desktop.GDesktopColorScheme">
+      <default>'default'</default>
+      <summary>Color scheme</summary>
+      <description>
+        The preferred color scheme for the user interface. Valid values are “default”, “prefer-dark”, 
“prefer-light”.
+      </description>
+    </key>
   </schema>
 </schemalist>