MainWindow: center on X11 and Wayland

.github/workflows/main.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Install Dependencies
         run: |
           apt update
-          apt install -y desktop-file-utils gettext meson libaccountsservice-dev libgtk-4-dev libgee-0.8-dev libgranite-7-dev libadwaita-1-dev libxkbregistry-dev libjson-glib-dev libpolkit-gobject-1-dev libpwquality-dev valac
+          apt install -y desktop-file-utils gettext meson libaccountsservice-dev libgtk-4-dev libgee-0.8-dev libgranite-7-dev libadwaita-1-dev libxkbregistry-dev libjson-glib-dev libpantheon-wayland-1-dev libpolkit-gobject-1-dev libpwquality-dev valac
       - name: Build
         run: |
           meson build

README.md

@@ -17,6 +17,7 @@ You'll need the following dependencies:
 * libgtk-4-dev
 * libadwaita-1-dev >= 1.4
 * libjson-glib-dev
+* libpantheon-wayland-1-dev
 * libpwquality-dev
 * libxkbregistry-dev
 * meson

meson.build

@@ -17,12 +17,16 @@ glib_dep = dependency('glib-2.0', version: '>=2.74')
 gobject_dep = dependency('gobject-2.0')
 granite_dep = dependency('granite-7', version: '>=7.4.0')
 gtk_dep = dependency('gtk4')
+gtk_wayland_dep = dependency('gtk4-wayland')
+gtk_x11_dep = dependency('gtk4-x11')
 adw_dep = dependency('libadwaita-1', version: '>=1.4.0')
 json_glib_dep = dependency('json-glib-1.0')
+pantheon_wayland_dep = dependency('pantheon-wayland-1')
 polkit_dep = dependency('polkit-gobject-1')
 posix_dep = meson.get_compiler('vala').find_library('posix')
 pwquality_dep = dependency('pwquality')
 xkbregistry_dep = dependency('xkbregistry')
+x11_dep = dependency('x11')
 
 dependencies = [
     accountservice_dep,
@@ -31,12 +35,16 @@ dependencies = [
     gobject_dep,
     granite_dep,
     gtk_dep,
+    gtk_wayland_dep,
+    gtk_x11_dep,
     adw_dep,
     json_glib_dep,
+    pantheon_wayland_dep,
     polkit_dep,
     posix_dep,
     pwquality_dep,
     xkbregistry_dep,
+    x11_dep
 ]
 
 subdir('po')

src/MainWindow.vala

@@ -17,7 +17,7 @@
  * Authored by: Corentin Noël <corentin@elementary.io>
  */
 
-public class Installer.MainWindow : Gtk.Window {
+public class Installer.MainWindow : Gtk.Window, PantheonWayland.ExtendedBehavior {
     private Adw.NavigationView navigationview;
 
     private AccountView account_view;
@@ -71,6 +71,30 @@ public class Installer.MainWindow : Gtk.Window {
 
             return Source.REMOVE;
         });
+
+        child.realize.connect (() => {
+            connect_to_shell ();
+            if (display is Gdk.Wayland.Display) {
+                make_centered ();
+            } else {
+                make_centered_x11 ();
+            }
+        });
+    }
+
+    private void make_centered_x11 () {
+        var display = Gdk.Display.get_default ();
+        if (display is Gdk.X11.Display) {
+            unowned var xdisplay = ((Gdk.X11.Display) display).get_xdisplay ();
+
+            var window = ((Gdk.X11.Surface) get_surface ()).get_xid ();
+
+            var prop = xdisplay.intern_atom ("_MUTTER_HINTS", false);
+
+            var value = "centered=1";
+
+            xdisplay.change_property (window, prop, X.XA_STRING, 8, 0, (uchar[]) value, value.length);
+        }
     }
 
     /*