Cast as widget

Author: teamcons

src/Services/ZoomController.vala

@@ -35,12 +35,12 @@ public class Jorts.ZoomController : Object {
         var keypress_controller = new Gtk.EventControllerKey ();
         keypress_controller.key_pressed.connect (on_key_press_event);
         keypress_controller.key_released.connect (on_key_release_event);
-        window.add_controller ((Gtk.EventController)keypress_controller);
+        ((Gtk.Widget)window).add_controller ((Gtk.EventController)keypress_controller);
 
         var scroll_controller = new Gtk.EventControllerScroll (VERTICAL);
         scroll_controller.scroll_end.connect (() => current_scroll_delta = 0);
         scroll_controller.scroll.connect (on_scroll);
-        window.add_controller ((Gtk.EventController)scroll_controller);
+        ((Gtk.Widget)window).add_controller ((Gtk.EventController)scroll_controller);
     }
 
     /**