[mutter] wayland/pointer: Use glib signals tracking focus surface

[Jonas Ådahl <jadahl src gnome org>]

commit b19e4592df42fd4bf7440e785a7fc58fe8378c3c
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed May 31 17:24:07 2017 +0800

    wayland/pointer: Use glib signals tracking focus surface
    
    Use the "destroy" MetaWaylandSurface signal instead of the wl_resource
    destroy signal for tracking the lifetime of the surface with pointer
    focus.
    
    As unsetting the focus may have side effects due to handlers of the
    "focus-surface-changed" signal, connect the signal after the default
    handler to make sure other clean up facilities have the chance deal with
    the surface destruction before we try to unset the focus.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=783113

 src/wayland/meta-wayland-pointer.c |   28 +++++++++++++++-------------
 src/wayland/meta-wayland-pointer.h |    2 +-
 2 files changed, 16 insertions(+), 14 deletions(-)
---
diff --git a/src/wayland/meta-wayland-pointer.c b/src/wayland/meta-wayland-pointer.c
index 4578f3e..7c05912 100644
--- a/src/wayland/meta-wayland-pointer.c
+++ b/src/wayland/meta-wayland-pointer.c
@@ -247,14 +247,6 @@ sync_focus_surface (MetaWaylandPointer *pointer)
 }
 
 static void
-pointer_handle_focus_surface_destroy (struct wl_listener *listener, void *data)
-{
-  MetaWaylandPointer *pointer = wl_container_of (listener, pointer, focus_surface_listener);
-
-  meta_wayland_pointer_set_focus (pointer, NULL);
-}
-
-static void
 meta_wayland_pointer_send_frame (MetaWaylandPointer *pointer,
                                 struct wl_resource *resource)
 {
@@ -488,8 +480,6 @@ meta_wayland_pointer_enable (MetaWaylandPointer *pointer)
     g_hash_table_new_full (NULL, NULL, NULL,
                            (GDestroyNotify) meta_wayland_pointer_client_free);
 
-  pointer->focus_surface_listener.notify = pointer_handle_focus_surface_destroy;
-
   pointer->cursor_surface = NULL;
 
   manager = clutter_device_manager_get_default ();
@@ -815,6 +805,13 @@ meta_wayland_pointer_broadcast_leave (MetaWaylandPointer *pointer,
   meta_wayland_pointer_broadcast_frame (pointer);
 }
 
+static void
+focus_surface_destroyed (MetaWaylandSurface *surface,
+                         MetaWaylandPointer *pointer)
+{
+  meta_wayland_pointer_set_focus (pointer, NULL);
+}
+
 void
 meta_wayland_pointer_set_focus (MetaWaylandPointer *pointer,
                                 MetaWaylandSurface *surface)
@@ -838,7 +835,9 @@ meta_wayland_pointer_set_focus (MetaWaylandPointer *pointer,
           pointer->focus_client = NULL;
         }
 
-      wl_list_remove (&pointer->focus_surface_listener.link);
+      g_signal_handler_disconnect (pointer->focus_surface,
+                                   pointer->focus_surface_destroyed_handler_id);
+      pointer->focus_surface_destroyed_handler_id = 0;
       pointer->focus_surface = NULL;
     }
 
@@ -848,8 +847,11 @@ meta_wayland_pointer_set_focus (MetaWaylandPointer *pointer,
       ClutterPoint pos;
 
       pointer->focus_surface = surface;
-      wl_resource_add_destroy_listener (pointer->focus_surface->resource,
-                                        &pointer->focus_surface_listener);
+
+      pointer->focus_surface_destroyed_handler_id =
+        g_signal_connect_after (pointer->focus_surface, "destroy",
+                                G_CALLBACK (focus_surface_destroyed),
+                                pointer);
 
       clutter_input_device_get_coords (pointer->device, NULL, &pos);
 
diff --git a/src/wayland/meta-wayland-pointer.h b/src/wayland/meta-wayland-pointer.h
index 547cd56..9f55590 100644
--- a/src/wayland/meta-wayland-pointer.h
+++ b/src/wayland/meta-wayland-pointer.h
@@ -71,7 +71,7 @@ struct _MetaWaylandPointer
   GHashTable *pointer_clients;
 
   MetaWaylandSurface *focus_surface;
-  struct wl_listener focus_surface_listener;
+  gulong focus_surface_destroyed_handler_id;
   guint32 focus_serial;
   guint32 click_serial;