use libnotify for notifications. show volume notification

meson.build

@@ -5,6 +5,7 @@ project('mictray', 'vala', 'c',
 gtk_dep = dependency('gtk+-3.0', version : '>=3.22')
 gee_dep = dependency('gee-0.8')
 pulse_dep = dependency('libpulse')
+notify_dep = dependency('libnotify')
 pulse_loop_dep = dependency('libpulse-mainloop-glib')
 
 
@@ -23,6 +24,6 @@ install_data('mictray.desktop', install_dir: install_desktoppath)
 
 executable('mictray', 'src/mictray.vala',
 	sources,
-	dependencies : [gtk_dep, pulse_dep, pulse_loop_dep, gee_dep],
+	dependencies : [gtk_dep, pulse_dep, pulse_loop_dep, gee_dep,notify_dep],
 	install: true
 )

src/mictray.vala

@@ -1,11 +1,13 @@
 
 using Gtk;
+using Notify;
 
 static MicStatusIcon status_icon;
 
 static Pulse pulse;
 static ConfigFile config;
 static MicTrayApp app;
+static Notify.Notification vol_notification;
 
 extern const string GETTEXT_PACKAGE;
 
@@ -18,17 +20,44 @@ class MicTrayApp : Gtk.Application
 		config = new ConfigFile();
 
 		pulse = new Pulse();
-		pulse.change_callback = () => {status_icon.update();};
+
+		Notify.init ("MicTray");
+		vol_notification = new Notify.Notification ("Volume: %d%c".printf(pulse.volume, '%'), "", status_icon.icon_name);
+		vol_notification.set_timeout(2000);
+		vol_notification.set_hint("transient", new Variant.boolean(true));
+
+		pulse.change_callback = () =>
+		{
+			status_icon.update();
+
+			if (config.show_notifications && pulse.old_volume != pulse.volume)
+			{
+				try
+				{
+					vol_notification.update("Volume: %d%c".printf(pulse.volume, '%'), "", status_icon.icon_name);
+					vol_notification.set_hint("value", new Variant.int32(pulse.volume));
+					vol_notification.show();
+				}
+				catch (Error e)
+				{
+					error ("Error: %s", e.message);
+				}
+			}
+		};
 
 		pulse.source_change_callback = () =>
 		{
 			if (config.show_notifications)
 			{
-				Notification notification = new Notification("Input source changed");
-				notification.set_icon(new ThemedIcon(status_icon.icon_name));
-				notification.set_body(pulse.current_source_description);
-
-				app.send_notification("source-changed", notification);
+				try
+				{
+					Notify.Notification notification = new Notify.Notification ("Input source changed", pulse.current_source_description, status_icon.icon_name);
+					notification.show();
+				}
+				catch (Error e)
+				{
+					error ("Error: %s", e.message);
+				}
 			}
 		};
 

src/pulse.vala

@@ -7,6 +7,7 @@ public class Pulse : Object
 	public string? current_source_name = null;
 	public string? current_source_description = null;
 	public int volume;
+	public int old_volume;
 	public bool muted;
 
 	public Callback change_callback;
@@ -181,6 +182,7 @@ public class Pulse : Object
 		{
 			if (eol > 0) return;
 
+			this.old_volume = this.volume;
 			this.volume = (int)((info.volume.avg() / (float)PulseAudio.Volume.NORM) * 100);
 			this.muted = (bool)info.mute;