Add onActivate and onDeactivate signals

extension.js

@@ -49,7 +49,7 @@ class MonitorWidget {
 
         // Don't know why, _rightBox seems undefined on shell 3.36 !!
         if (this.box === undefined) {
-            log(`${box} is undefined, falling back to centerBox`);
+            log(`${box} box is undefined, falling back to center one`);
             this.box = Main.panel._centerBox;
         }
 
@@ -79,7 +79,6 @@ class MonitorWidget {
 
     _addToBox(lastWidget) {
         // lastWidget => NULL, insert at the end
-        // Add to box
         if (this.box !== Main.panel._rigthBox || lastWidget) {
             if (this.icon) {
                 this.box.insert_child_above(this.icon, lastWidget);
@@ -177,6 +176,7 @@ class GenericMonitorDBUS {
         this.clutterSettings = clutter.Settings.get_default();
         this._dbusImpl = Gio.DBusExportedObject.wrapJSObject(loadInterfaceXml('dbus.xml'), this);
         this._dbusImpl.export(Gio.DBus.session, '/com/soutade/GenericMonitor');
+        this._dbusImpl.emit_signal('onActivate', null);
     }
 
     _checkParmeters(parameters) {
@@ -399,6 +399,7 @@ class GenericMonitorDBUS {
     }
 
     destructor() {
+        this._dbusImpl.emit_signal('onDeactivate', null);
         for (let groupIndex in this.monitor_groups) {
             let group = this.monitor_groups[groupIndex];
             for (let itemIndex in group)