Follow elementary OS-wide dark preference

README.md

@@ -11,8 +11,9 @@ The hero that Gotham needs. Harvey is a color contrast checker. It checks a give
 
 
 You'll need the following dependencies to build:
+* libgranite-dev (>= 5.4.0)
 * libgtk-3-dev
-* libhandy-1-dev
+* libhandy-1-dev (>= 0.90.0)
 * meson
 * valac
 

io.github.danirabbit.harvey.yml

@@ -7,9 +7,6 @@ finish-args:
   - '--share=ipc'
   - '--socket=fallback-x11'
   - '--socket=wayland'
-
-  # needed for perfers-color-scheme
-  - '--system-talk-name=org.freedesktop.Accounts'
 modules:
   - name: harvey
     buildsystem: meson

meson.build

@@ -20,6 +20,7 @@ executable(
     dependencies: [
         dependency('glib-2.0'),
         dependency('gobject-2.0'),
+        dependency('granite', version: '>= 5.4.0'),
         dependency('gtk+-3.0'),
         dependency('libhandy-1', version: '>= 0.90.0'),
         meson.get_compiler('c').find_library('m', required : false)

src/Application.vala

@@ -15,6 +15,22 @@ public class Harvey : Gtk.Application {
         settings = new Settings ("io.github.danirabbit.harvey");
     }
 
+    protected override void startup () {
+        base.startup ();
+
+        // Follow elementary OS-wide dark preference
+        var granite_settings = Granite.Settings.get_default ();
+        var gtk_settings = Gtk.Settings.get_default ();
+
+        granite_settings.bind_property ("prefers-color-scheme", gtk_settings, "gtk-application-prefer-dark-theme",
+            BindingFlags.DEFAULT | BindingFlags.SYNC_CREATE,
+            ((binding, granite_prop, ref gtk_prop) => {
+                gtk_prop.set_boolean ((Granite.Settings.ColorScheme) granite_prop == Granite.Settings.ColorScheme.DARK);
+                return true;
+            })
+        );
+    }
+
     protected override void activate () {
         if (get_windows ().length () > 0) {
             get_windows ().data.present ();