Handle sound confirmations in the indicator

meson.build

@@ -50,12 +50,13 @@ shared_module(
     'src/Widgets/PlayerList.vala',
     'src/Widgets/DeviceManagerWidget.vala',
     'src/Widgets/DeviceItem.vala',
-    'src/Services/PulseAudioManager.vala',
-    'src/Services/MprisClient.vala',
-    'src/Services/Volume-control.vala',
-    'src/Services/Manager.vala',
+    'src/Services/DBus.vala',
     'src/Services/Device.vala',
+    'src/Services/Manager.vala',
     'src/Services/MediaPlayer.vala',
+    'src/Services/MprisClient.vala',
+    'src/Services/PulseAudioManager.vala',
+    'src/Services/Volume-control.vala',
     gresource,
     dependencies: [
         dependency('glib-2.0'),

src/Services/DBus.vala

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2023 elementary, Inc. <https://elementary.io>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+[DBus (name = "io.elementary.wingpanel.sound")]
+public class Sound.DBus : GLib.Object {
+    [DBus (visible = false)]
+    public signal void on_handle_osd ();
+
+    private static GLib.Once<Sound.DBus> instance;
+
+    [DBus (visible = false)]
+    public static Sound.DBus get_default () {
+        return instance.once (() => {
+            return new Sound.DBus ();
+        });
+    }
+
+    private DBus () {
+        Object ();
+    }
+
+    [DBus (visible = false)]
+    public static void init () {
+        Bus.own_name (SESSION, "io.elementary.wingpanel.sound", NONE,
+            (connection) => {
+                try {
+                    connection.register_object ("/io/elementary/wingpanel/sound", get_default ());
+                } catch (Error e) {
+                    warning (e.message);
+                }
+            },
+            () => {},
+            () => warning ("Could not acquire name")
+        );
+    }
+
+    public void handle_osd () throws DBusError, IOError {
+        on_handle_osd ();
+    }
+}

src/Widgets/DisplayWidget.vala

@@ -27,6 +27,7 @@ public class DisplayWidget : Gtk.Box {
     public signal void volume_press_event (Gdk.EventButton e);
     public signal void mic_press_event (Gdk.EventButton e);
 
+    private Gtk.Revealer volume_levelbar_revealer;
     private uint volume_timeout = 0;
 
     construct {
@@ -42,7 +43,7 @@ public class DisplayWidget : Gtk.Box {
         };
         volume_levelbar.get_style_context ().add_provider (provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);
 
-        var volume_levelbar_revealer = new Gtk.Revealer () {
+        volume_levelbar_revealer = new Gtk.Revealer () {
             child = volume_levelbar,
             reveal_child = false,
             transition_type = SLIDE_LEFT
@@ -119,19 +120,22 @@ public class DisplayWidget : Gtk.Box {
             }
         });
 
-        notify["volume"].connect (() => {
-            if (volume_timeout != 0) {
-                Source.remove (volume_timeout);
-                volume_timeout = 0;
-            }
+        Sound.DBus.init ();
+        Sound.DBus.get_default ().on_handle_osd.connect (show_volume_levelbar);
+    }
 
-            volume_levelbar_revealer.reveal_child = true;
+    public void show_volume_levelbar () {
+        if (volume_timeout != 0) {
+            Source.remove (volume_timeout);
+            volume_timeout = 0;
+        }
 
-            if (volume_timeout == 0) {
-                volume_timeout = Timeout.add_seconds (1, () => {
-                    volume_levelbar_revealer.reveal_child = false;
-                });
-            }
+        volume_levelbar_revealer.reveal_child = true;
+
+        volume_timeout = Timeout.add_seconds (1, () => {
+            volume_levelbar_revealer.reveal_child = false;
+            volume_timeout = 0;
+            return Source.REMOVE;
         });
     }
 }