[mutter/wayland] Revert "pointer: Remove focus listener"

[Jasper St. Pierre <jstpierre src gnome org>]

commit 602307e694dbafcb58f929b1b68b527f77b48118
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Dec 3 10:50:35 2013 -0500

    Revert "pointer: Remove focus listener"
    
    This reverts commit a8ac2cc27543ef4afe762e8a0675cceef7afdf91.

 src/wayland/meta-wayland-pointer.c |   17 +++++++++++++++++
 src/wayland/meta-wayland-pointer.h |    1 +
 2 files changed, 18 insertions(+), 0 deletions(-)
---
diff --git a/src/wayland/meta-wayland-pointer.c b/src/wayland/meta-wayland-pointer.c
index 6246872..193cd4d 100644
--- a/src/wayland/meta-wayland-pointer.c
+++ b/src/wayland/meta-wayland-pointer.c
@@ -64,6 +64,16 @@ meta_wayland_pointer_get_seat (MetaWaylandPointer *pointer)
 }
 
 static void
+lose_pointer_focus (struct wl_listener *listener, void *data)
+{
+  MetaWaylandPointer *pointer =
+    wl_container_of (listener, pointer, focus_listener);
+
+  pointer->focus_resource = NULL;
+  pointer->focus = NULL;
+}
+
+static void
 default_grab_focus (MetaWaylandPointerGrab *grab,
                     MetaWaylandSurface     *surface,
                    const ClutterEvent     *event)
@@ -257,6 +267,7 @@ meta_wayland_pointer_init (MetaWaylandPointer *pointer,
 
   memset (pointer, 0, sizeof *pointer);
   wl_list_init (&pointer->resource_list);
+  pointer->focus_listener.notify = lose_pointer_focus;
   pointer->default_grab.interface = &default_pointer_grab_interface;
   pointer->default_grab.pointer = pointer;
   pointer->grab = &pointer->default_grab;
@@ -276,6 +287,10 @@ meta_wayland_pointer_init (MetaWaylandPointer *pointer,
 void
 meta_wayland_pointer_release (MetaWaylandPointer *pointer)
 {
+  /* XXX: What about pointer->resource_list? */
+  if (pointer->focus_resource)
+    wl_list_remove (&pointer->focus_listener.link);
+
   pointer->focus = NULL;
   pointer->focus_resource = NULL;
 }
@@ -313,6 +328,7 @@ meta_wayland_pointer_set_focus (MetaWaylandPointer *pointer,
       struct wl_display *display = wl_client_get_display (client);
       serial = wl_display_next_serial (display);
       wl_pointer_send_leave (resource, serial, pointer->focus->resource);
+      wl_list_remove (&pointer->focus_listener.link);
     }
 
   resource = find_resource_for_surface (&pointer->resource_list, surface);
@@ -345,6 +361,7 @@ meta_wayland_pointer_set_focus (MetaWaylandPointer *pointer,
                                 wl_fixed_to_int (pointer->x),
                                 wl_fixed_to_int (pointer->y));
       wl_pointer_send_enter (resource, serial, surface->resource, sx, sy);
+      wl_resource_add_destroy_listener (resource, &pointer->focus_listener);
       pointer->focus_serial = serial;
     }
 
diff --git a/src/wayland/meta-wayland-pointer.h b/src/wayland/meta-wayland-pointer.h
index a31d609..95a4b5e 100644
--- a/src/wayland/meta-wayland-pointer.h
+++ b/src/wayland/meta-wayland-pointer.h
@@ -48,6 +48,7 @@ struct _MetaWaylandPointer
   struct wl_list resource_list;
   MetaWaylandSurface *focus;
   struct wl_resource *focus_resource;
+  struct wl_listener focus_listener;
   guint32 focus_serial;
   guint32 click_serial;