[mutter/wip/dnd-surface3: 11/11] wayland: Ensure drag surface offset changes update the DnD actor

[Carlos Garnacho <carlosg src gnome org>]

commit 80398e065f3d2db1c24a386cca90858eb10625e7
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Oct 6 17:07:43 2014 +0200

    wayland: Ensure drag surface offset changes update the DnD actor

 src/wayland/meta-wayland-data-device.c |   26 ++++++++++++++++++++++++++
 src/wayland/meta-wayland-data-device.h |    4 ++++
 src/wayland/meta-wayland-surface.c     |    9 +++++++++
 3 files changed, 39 insertions(+), 0 deletions(-)
---
diff --git a/src/wayland/meta-wayland-data-device.c b/src/wayland/meta-wayland-data-device.c
index 97f1426..421d34b 100644
--- a/src/wayland/meta-wayland-data-device.c
+++ b/src/wayland/meta-wayland-data-device.c
@@ -645,3 +645,29 @@ meta_wayland_data_device_set_keyboard_focus (MetaWaylandDataDevice *data_device)
       wl_data_device_send_selection (data_device_resource, offer);
     }
 }
+
+gboolean
+meta_wayland_data_device_is_dnd_surface (MetaWaylandDataDevice *data_device,
+                                         MetaWaylandSurface    *surface)
+{
+  return data_device->current_grab &&
+    data_device->current_grab->drag_surface == surface;
+}
+
+void
+meta_wayland_data_device_update_dnd_surface (MetaWaylandDataDevice *data_device)
+{
+  MetaWaylandDragGrab *drag_grab;
+
+  if (!data_device->current_grab)
+    return;
+
+  drag_grab = data_device->current_grab;
+
+  if (!drag_grab->feedback_actor || !drag_grab->drag_surface)
+    return;
+
+  meta_feedback_actor_set_anchor (META_FEEDBACK_ACTOR (drag_grab->feedback_actor),
+                                  -drag_grab->drag_surface->offset_x,
+                                  -drag_grab->drag_surface->offset_y);
+}
diff --git a/src/wayland/meta-wayland-data-device.h b/src/wayland/meta-wayland-data-device.h
index 854c1fd..b4b3900 100644
--- a/src/wayland/meta-wayland-data-device.h
+++ b/src/wayland/meta-wayland-data-device.h
@@ -44,4 +44,8 @@ void meta_wayland_data_device_init (MetaWaylandDataDevice *data_device);
 
 void meta_wayland_data_device_set_keyboard_focus (MetaWaylandDataDevice *data_device);
 
+gboolean meta_wayland_data_device_is_dnd_surface (MetaWaylandDataDevice *data_device,
+                                                  MetaWaylandSurface    *surface);
+void meta_wayland_data_device_update_dnd_surface (MetaWaylandDataDevice *data_device);
+
 #endif /* META_WAYLAND_DATA_DEVICE_H */
diff --git a/src/wayland/meta-wayland-surface.c b/src/wayland/meta-wayland-surface.c
index cf840e5..01d09a7 100644
--- a/src/wayland/meta-wayland-surface.c
+++ b/src/wayland/meta-wayland-surface.c
@@ -176,6 +176,13 @@ cursor_surface_commit (MetaWaylandSurface      *surface,
 }
 
 static void
+dnd_surface_commit (MetaWaylandSurface      *surface,
+                    MetaWaylandPendingState *pending)
+{
+  meta_wayland_data_device_update_dnd_surface (&surface->compositor->seat->data_device);
+}
+
+static void
 calculate_surface_window_geometry (MetaWaylandSurface *surface,
                                    MetaRectangle      *total_geometry,
                                    float               parent_x,
@@ -445,6 +452,8 @@ commit_pending_state (MetaWaylandSurface      *surface,
 
   if (surface == compositor->seat->pointer.cursor_surface)
     cursor_surface_commit (surface, pending);
+  else if (meta_wayland_data_device_is_dnd_surface (&compositor->seat->data_device, surface))
+    dnd_surface_commit (surface, pending);
   else if (surface->window)
     toplevel_surface_commit (surface, pending);
   else if (surface->subsurface.resource)