Add toast overlay with signal

src/application.vala

@@ -19,6 +19,8 @@
  */
 
 public class Allesapp.Application : Adw.Application {
+    public signal void toast (string message, int timeout = 5);
+
     public Application () {
         Object (
             application_id: "de.clerie.allesapp",

src/main.vala

@@ -18,11 +18,13 @@
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
+public static Allesapp.Application app;
+
 int main (string[] args) {
     Intl.bindtextdomain (Config.GETTEXT_PACKAGE, Config.LOCALEDIR);
     Intl.bind_textdomain_codeset (Config.GETTEXT_PACKAGE, "UTF-8");
     Intl.textdomain (Config.GETTEXT_PACKAGE);
 
-    var app = new Allesapp.Application ();
+    app = new Allesapp.Application ();
     return app.run (args);
 }

src/window.ui

@@ -21,6 +21,8 @@
             </child>
           </object>
         </child>
+        <child>
+          <object class="AdwToastOverlay" id="toast_overlay">
             <child>
               <object class="GtkBox">
                 <property name="orientation">vertical</property>
@@ -54,6 +56,8 @@
               </object>
             </child>
           </object>
+        </child>
+      </object>
     </property>
     <property name="default-height">600</property>
     <property name="default-width">800</property>

src/window.vala

@@ -23,10 +23,17 @@ public class Allesapp.Window : Adw.ApplicationWindow {
     [GtkChild]
     private unowned Gtk.Label my_ip_address_label;
 
+    [GtkChild]
+    private unowned Adw.ToastOverlay toast_overlay;
+
     public Window (Gtk.Application app) {
         Object (application: app);
     }
 
+    construct {
+        app.toast.connect (add_toast);
+    }
+
     [GtkCallback]
     private void on_fetch_my_ip_address () {
 
@@ -36,7 +43,13 @@ public class Allesapp.Window : Adw.ApplicationWindow {
         var input_stream = session.send (msg);
         var data_input_stream = new DataInputStream (input_stream);
 
-        my_ip_address_label.set_label (data_input_stream.read_line_utf8());
+        app.toast (data_input_stream.read_line_utf8());
 
     }
+
+    private void add_toast (string message, int timeout) {
+        toast_overlay.add_toast (new Adw.Toast (message) {
+            timeout = timeout
+        });
+    }
 }