Reimplemented dark mode. Removed toggle. Changing with system theme

Author: adithyankv

com.github.peteruithoven.resizer.yml

@@ -20,6 +20,7 @@ finish-args:
   - '--socket=fallback-x11'
   - '--socket=wayland'
   - '--filesystem=home'
+  - '--system-talk-name=org.freedesktop.Accounts'
 
 # This section is where you list all the source code required to build your app.
 # If we had external dependencies that weren't included in our SDK, we would list

data/com.github.peteruithoven.resizer.gschema.xml

@@ -8,13 +8,5 @@
             <range min="1" max="10000"/>
             <default>1000</default>
         </key>
-        <key name="dark-mode-on" type="b">
-            <default>false</default>
-            <summary>dark theme activated</summary>
-            <description>
-                To toggle between system dark theme and light theme.
-                True if dark theme is to be used
-            </description>
-        </key>
     </schema>
 </schemalist>

src/Application.vala

@@ -46,11 +46,30 @@ namespace Resizer {
         }
 
         protected override void activate () {
+            set_theme();
+
             window = new Window ();
             window.set_application (this);
             window.show_all ();
         }
 
+        private void set_theme (){
+            var sys_settings = Granite.Settings.get_default ();
+            var settings = Gtk.Settings.get_default ();
+
+            settings.gtk_application_prefer_dark_theme = is_dark_theme_prefered(sys_settings, settings);
+
+            /* be notified when system theme is changed and change accordingly */
+            sys_settings.notify["prefers-color-scheme"].connect (() => {
+                settings.gtk_application_prefer_dark_theme = is_dark_theme_prefered(sys_settings, settings);
+            });
+        }
+
+        private bool is_dark_theme_prefered (Granite.Settings sys_settings, Gtk.Settings settings){
+                return (sys_settings.prefers_color_scheme == Granite.Settings.ColorScheme.DARK);
+        }
+
+
         public static int main (string[] args) {
             var app = new Application ();
             return app.run (args);

src/HeaderBar.vala

@@ -21,7 +21,6 @@
 
 namespace Resizer {
     public class HeaderBar : Hdy.HeaderBar {
-        private Settings settings = new Settings (Constants.PROJECT_NAME);
 
         construct {
             show_close_button = true;
@@ -46,17 +45,7 @@ namespace Resizer {
             info_menu.valign = Gtk.Align.CENTER;
             info_menu.popover = infoPopover;
 
-            var gtk_settings = Gtk.Settings.get_default ();
-            var mode_toggle = new Granite.ModeSwitch.from_icon_name ("display-brightness-symbolic",
-                                                                     "weather-clear-night-symbolic");
-            mode_toggle.valign = Gtk.Align.CENTER;
-            mode_toggle.primary_icon_tooltip_text = _("Light background");
-            mode_toggle.secondary_icon_tooltip_text = _("Dark background");
-            mode_toggle.bind_property ("active", gtk_settings, "gtk_application_prefer_dark_theme");
-            settings.bind("dark-mode-on", mode_toggle, "active", GLib.SettingsBindFlags.DEFAULT);
-
             pack_end (info_menu);
-            pack_end (mode_toggle);
         }
     }
 }