mconnect/battery-proxy: send org.freedesktop.DBus.Properties.PropertiesChanged

src/mconnect/battery-proxy.vala

@@ -24,6 +24,7 @@ class BatteryHandlerProxy : Object, PacketHandlerInterfaceProxy {
 	private Device device = null;
 	private BatteryHandler battery_handler = null;
 	private uint register_id = 0;
+	private ulong notify_id = 0;
 
 	public uint level { get; private set; default = 0; }
 	public bool charging { get; private set; default = false; }
@@ -51,6 +52,10 @@ class BatteryHandlerProxy : Object, PacketHandlerInterfaceProxy {
 	public void bus_register(DBusConnection conn, string path) throws IOError {
 		if (this.register_id == 0)
 			this.register_id = conn.register_object(path, this);
+
+		this.notify_id = this.notify.connect((spec) => {
+				this.send_property_change(conn, path, spec);
+			});
 	}
 
 	[DBus (visible = false)]
@@ -58,7 +63,39 @@ class BatteryHandlerProxy : Object, PacketHandlerInterfaceProxy {
 		if (this.register_id != 0)
 			conn.unregister_object(this.register_id);
 		this.register_id = 0;
+
+		this.disconnect(this.notify_id);
+		this.notify_id = 0;
 	}
 
 	public signal void battery(uint level, bool charging);
+
+	private void send_property_change(DBusConnection conn, string path, ParamSpec p) {
+		var builder = new VariantBuilder (VariantType.ARRAY);
+        var invalid_builder = new VariantBuilder (new VariantType ("as"));
+
+        if (p.name == "level") {
+            Variant i = this.level;
+            builder.add ("{sv}", "level", i);
+        }
+
+        if (p.name == "charging") {
+            Variant i = this.charging;
+            builder.add ("{sv}", "charging", i);
+        }
+
+        try {
+            conn.emit_signal(null,
+							 path,
+							 "org.freedesktop.DBus.Properties",
+							 "PropertiesChanged",
+							 new Variant ("(sa{sv}as)",
+										  "org.mconnect.Device.Battery",
+										  builder,
+										  invalid_builder)
+				);
+        } catch (Error e) {
+            warning("%s\n", e.message);
+        }
+	}
 }