window: Add a catch-all global handler hook

clients/window.c

@@ -80,6 +80,7 @@ struct display {
 	cairo_surface_t **pointer_surfaces;
 
 	display_drag_offer_handler_t drag_offer_handler;
+	display_global_handler_t global_handler;
 };
 
 struct window {
@@ -1338,6 +1339,8 @@ display_handle_global(struct wl_display *display, uint32_t id,
 			offer = wl_drag_offer_create(display, id);
 			d->drag_offer_handler(offer, d);
 		}
+	} else if (d->global_handler) {
+		d->global_handler(d, interface, version);
 	}
 }
 
@@ -1544,3 +1547,10 @@ display_set_drag_offer_handler(struct display *display,
 {
 	display->drag_offer_handler = handler;
 }
+
+void
+display_set_global_handler(struct display *display,
+			   display_global_handler_t handler)
+{
+	display->global_handler = handler;
+}

clients/window.h

@@ -127,6 +127,10 @@ typedef int (*window_motion_handler_t)(struct window *window,
 typedef void (*display_drag_offer_handler_t)(struct wl_drag_offer *offer,
 					     struct display *display);
 
+typedef void (*display_global_handler_t)(struct display *display,
+					 const char *interface,
+					 uint32_t version);
+
 struct window *
 window_create(struct display *display, const char *title,
 	      int32_t width, int32_t height);
@@ -224,6 +228,10 @@ void
 display_set_drag_offer_handler(struct display *display,
 			       display_drag_offer_handler_t handler);
 
+void
+display_set_global_handler(struct display *display,
+			   display_global_handler_t handler);
+
 struct wl_drag *
 window_create_drag(struct window *window);