MainWindow: center with shell protocol

.github/workflows/main.yml

@@ -24,7 +24,7 @@ jobs:
     - name: Install Dependencies
       run: |
         apt update
-        apt install -y desktop-file-utils libgranite-7-dev libgtk-4-dev libadwaita-1-dev meson valac
+        apt install -y desktop-file-utils libgranite-7-dev libgtk-4-dev libadwaita-1-dev libpantheon-wayland-1-dev meson valac
     - name: Build
       run: |
         meson build

README.md

@@ -9,6 +9,7 @@ You'll need the following dependencies:
 * libgtk-4-dev (>= 4.10)
 * libgranite-7-dev
 * libadwaita-1-dev (>= 1.4.0)
+* libpantheon-wayland-1-dev
 * meson
 * valac
 

meson.build

@@ -23,6 +23,7 @@ gtk_dep = dependency('gtk4', version: '>= 4.10')
 posix_dep = meson.get_compiler('vala').find_library('posix')
 adw_dep = dependency('libadwaita-1', version: '>= 1.4.0')
 m_dep = cc.find_library('m', required : false)
+pantheon_wayland_dep = dependency('pantheon-wayland-1')
 
 dependencies = [
     gee_dep,
@@ -32,7 +33,8 @@ dependencies = [
     gtk_dep,
     posix_dep,
     adw_dep,
-    m_dep
+    m_dep,
+    pantheon_wayland_dep
 ]
 
 asresources = gnome.compile_resources(

src/MainWindow.vala

@@ -17,7 +17,7 @@
  * Authored by: Corentin Noël <[email protected]>
  */
 
-public class Onboarding.MainWindow : Gtk.ApplicationWindow {
+public class Onboarding.MainWindow : Gtk.ApplicationWindow, PantheonWayland.ExtendedBehavior {
     public string[] viewed { get; set; }
     public static GLib.Settings settings;
     public static ListStore pages;
@@ -140,6 +140,11 @@ public class Onboarding.MainWindow : Gtk.ApplicationWindow {
         add_action (back_action);
         add_action (next_action);
         add_action (skip_action);
+
+        child.realize.connect (() => {
+            connect_to_shell ();
+            make_centered ();
+        });
     }
 
     private void action_next () {