wayland: Implement DnD actions as per wl_data_device v3 changes

We now additionally send:
  - wl_data_offer.source_actions
  - wl_data_source.action
  - wl_data_offer.action
  - wl_data_source.drop_performed
  - wl_data_source.drag_finished

The protocol changes allow for compositors to implement different policies
when chosing the action, mutter uses this to reimplement the same behavior
that GTK+ traditionally had:

  - Alt/Control/Shift modifiers change the chosen action to
    ask/copy/move respectively
  - Drags with middle button start out as "ask" by default

As mutter now also grabs the keyboard and unsets the window focus for these
purposes, the window focus is restored after the drag operation has
finished.

src/wayland/meta-wayland-data-device.c

@@ -42,12 +42,18 @@ struct _MetaWaylandDataOffer
   struct wl_resource *resource;
   MetaWaylandDataSource *source;
   struct wl_listener source_destroy_listener;
+  uint32_t dnd_actions;
+  uint32_t preferred_dnd_action;
 };
 
 typedef struct _MetaWaylandDataSourcePrivate
 {
+  MetaWaylandDataOffer *offer;
   struct wl_array mime_types;
   gboolean has_target;
+  uint32_t dnd_actions;
+  uint32_t user_dnd_action;
+  uint32_t current_dnd_action;
 } MetaWaylandDataSourcePrivate;
 
 typedef struct _MetaWaylandDataSourceWayland
@@ -74,6 +80,50 @@ unbind_resource (struct wl_resource *resource)
   wl_list_remove (wl_resource_get_link (resource));
 }
 
+static uint32_t
+data_offer_choose_action (MetaWaylandDataOffer *offer)
+{
+  MetaWaylandDataSource *source = offer->source;
+  uint32_t actions, user_action, available_actions;
+
+  actions = meta_wayland_data_source_get_actions (source);
+  user_action = meta_wayland_data_source_get_user_action (source);
+
+  available_actions = actions & offer->dnd_actions;
+
+  if (!available_actions)
+    return 0;
+
+  /* If the user is forcing an action, go for it */
+  if ((user_action & available_actions) != 0)
+    return user_action;
+
+  /* If the dest side has a preferred DnD action, use it */
+  if ((offer->preferred_dnd_action & available_actions) != 0)
+    return offer->preferred_dnd_action;
+
+  /* Use the first found action, in bit order */
+  return 1 << (ffs (available_actions) - 1);
+}
+
+static void
+data_offer_update_action (MetaWaylandDataOffer *offer)
+{
+  uint32_t current_action, action;
+
+  if (!offer->source)
+    return;
+
+  current_action = meta_wayland_data_source_get_current_action (offer->source);
+  action = data_offer_choose_action (offer);
+
+  if (current_action == action)
+    return;
+
+  meta_wayland_data_source_set_current_action (offer->source, action);
+  wl_data_offer_send_action (offer->resource, action);
+}
+
 static void
 meta_wayland_data_source_target (MetaWaylandDataSource *source,
                                  const char *mime_type)
@@ -123,6 +173,106 @@ meta_wayland_data_source_cancel (MetaWaylandDataSource *source)
   META_WAYLAND_DATA_SOURCE_GET_CLASS (source)->cancel (source);
 }
 
+uint32_t
+meta_wayland_data_source_get_actions (MetaWaylandDataSource *source)
+{
+  MetaWaylandDataSourcePrivate *priv =
+    meta_wayland_data_source_get_instance_private (source);
+
+  return priv->dnd_actions;
+}
+
+uint32_t
+meta_wayland_data_source_get_user_action (MetaWaylandDataSource *source)
+{
+  MetaWaylandDataSourcePrivate *priv =
+    meta_wayland_data_source_get_instance_private (source);
+
+  return priv->user_dnd_action;
+}
+
+uint32_t
+meta_wayland_data_source_get_current_action (MetaWaylandDataSource *source)
+{
+  MetaWaylandDataSourcePrivate *priv =
+    meta_wayland_data_source_get_instance_private (source);
+
+  return priv->current_dnd_action;
+}
+
+static void
+meta_wayland_data_source_set_current_offer (MetaWaylandDataSource *source,
+                                            MetaWaylandDataOffer  *offer)
+{
+  MetaWaylandDataSourcePrivate *priv =
+    meta_wayland_data_source_get_instance_private (source);
+
+  priv->offer = offer;
+}
+
+static MetaWaylandDataOffer *
+meta_wayland_data_source_get_current_offer (MetaWaylandDataSource *source)
+{
+  MetaWaylandDataSourcePrivate *priv =
+    meta_wayland_data_source_get_instance_private (source);
+
+  return priv->offer;
+}
+
+void
+meta_wayland_data_source_set_current_action (MetaWaylandDataSource *source,
+                                             uint32_t               action)
+{
+  MetaWaylandDataSourcePrivate *priv =
+    meta_wayland_data_source_get_instance_private (source);
+
+  if (priv->current_dnd_action == action)
+    return;
+
+  priv->current_dnd_action = action;
+  META_WAYLAND_DATA_SOURCE_GET_CLASS (source)->action (source, action);
+}
+
+void
+meta_wayland_data_source_set_actions (MetaWaylandDataSource *source,
+                                      uint32_t               dnd_actions)
+{
+  MetaWaylandDataSourcePrivate *priv =
+    meta_wayland_data_source_get_instance_private (source);
+  MetaWaylandDataOffer *offer;
+
+  if (priv->dnd_actions == dnd_actions)
+    return;
+
+  priv->dnd_actions = dnd_actions;
+  offer = meta_wayland_data_source_get_current_offer (source);
+
+  if (offer)
+    {
+      wl_data_offer_send_source_actions (offer->resource,
+                                         priv->dnd_actions);
+      data_offer_update_action (offer);
+    }
+}
+
+static void
+meta_wayland_data_source_set_user_action (MetaWaylandDataSource *source,
+                                          uint32_t               action)
+{
+  MetaWaylandDataSourcePrivate *priv =
+    meta_wayland_data_source_get_instance_private (source);
+  MetaWaylandDataOffer *offer;
+
+  if (priv->user_dnd_action == action)
+    return;
+
+  priv->user_dnd_action = action;
+  offer = meta_wayland_data_source_get_current_offer (source);
+
+  if (offer)
+    data_offer_update_action (offer);
+}
+
 static void
 data_offer_accept (struct wl_client *client,
                    struct wl_resource *resource,
@@ -161,21 +311,59 @@ data_offer_destroy (struct wl_client *client, struct wl_resource *resource)
   wl_resource_destroy (resource);
 }
 
+static void
+data_offer_set_actions (struct wl_client   *client,
+                        struct wl_resource *resource,
+                        uint32_t            dnd_actions,
+                        uint32_t            preferred_action)
+{
+  MetaWaylandDataOffer *offer = wl_resource_get_user_data (resource);
+
+  if (offer->dnd_actions == dnd_actions &&
+      offer->preferred_dnd_action == preferred_action)
+    return;
+
+  offer->dnd_actions = dnd_actions;
+  offer->preferred_dnd_action = preferred_action;
+
+  data_offer_update_action (offer);
+}
+
 static const struct wl_data_offer_interface data_offer_interface = {
   data_offer_accept,
   data_offer_receive,
   data_offer_destroy,
+  data_offer_set_actions
 };
 
+static void
+meta_wayland_data_source_notify_drop_performed (MetaWaylandDataSource *source)
+{
+  META_WAYLAND_DATA_SOURCE_GET_CLASS (source)->drop_performed (source);
+}
+
+void
+meta_wayland_data_source_notify_finish (MetaWaylandDataSource *source)
+{
+  META_WAYLAND_DATA_SOURCE_GET_CLASS (source)->drag_finished (source);
+}
+
 static void
 destroy_data_offer (struct wl_resource *resource)
 {
   MetaWaylandDataOffer *offer = wl_resource_get_user_data (resource);
 
   if (offer->source)
-    g_object_remove_weak_pointer (G_OBJECT (offer->source),
+    {
-                                  (gpointer *)&offer->source);
+      if (offer == meta_wayland_data_source_get_current_offer (offer->source))
+        meta_wayland_data_source_notify_finish (offer->source);
 
+      g_object_remove_weak_pointer (G_OBJECT (offer->source),
+                                    (gpointer *)&offer->source);
+      offer->source = NULL;
+    }
+
+  meta_display_sync_wayland_input_focus (meta_get_display ());
   g_slice_free (MetaWaylandDataOffer, offer);
 }
 
@@ -203,6 +391,9 @@ meta_wayland_data_source_send_offer (MetaWaylandDataSource *source,
   wl_array_for_each (p, &priv->mime_types)
     wl_data_offer_send_offer (offer->resource, *p);
 
+  data_offer_update_action (offer);
+  meta_wayland_data_source_set_current_offer (source, offer);
+
   return offer->resource;
 }
 
@@ -222,14 +413,27 @@ data_source_destroy (struct wl_client *client, struct wl_resource *resource)
   wl_resource_destroy (resource);
 }
 
+static void
+data_source_set_actions (struct wl_client   *client,
+                         struct wl_resource *resource,
+                         uint32_t            dnd_actions)
+{
+  MetaWaylandDataSource *source = wl_resource_get_user_data (resource);
+
+  meta_wayland_data_source_set_actions (source, dnd_actions);
+}
+
 static struct wl_data_source_interface data_source_interface = {
   data_source_offer,
-  data_source_destroy
+  data_source_destroy,
+  data_source_set_actions
 };
 
 struct _MetaWaylandDragGrab {
   MetaWaylandPointerGrab  generic;
 
+  MetaWaylandKeyboardGrab keyboard_grab;
+
   MetaWaylandSeat        *seat;
   struct wl_client       *drag_client;
 
@@ -248,6 +452,7 @@ struct _MetaWaylandDragGrab {
   struct wl_listener      drag_origin_listener;
 
   int                     drag_start_x, drag_start_y;
+  ClutterModifierType     buttons;
 };
 
 static void
@@ -256,6 +461,7 @@ destroy_drag_focus (struct wl_listener *listener, void *data)
   MetaWaylandDragGrab *grab = wl_container_of (listener, grab, drag_focus_listener);
 
   grab->drag_focus_data_device = NULL;
+  grab->drag_focus = NULL;
 }
 
 void
@@ -285,6 +491,7 @@ meta_wayland_drag_grab_set_focus (MetaWaylandDragGrab *drag_grab,
   client = wl_resource_get_client (surface->resource);
 
   data_device_resource = wl_resource_find_for_client (&seat->data_device.resource_list, client);
+  meta_wayland_data_source_set_current_offer (drag_grab->drag_data_source, NULL);
 
   if (drag_grab->drag_data_source && data_device_resource)
     offer = meta_wayland_data_source_send_offer (drag_grab->drag_data_source,
@@ -312,6 +519,22 @@ drag_grab_focus (MetaWaylandPointerGrab *grab,
   meta_wayland_drag_grab_set_focus (drag_grab, surface);
 }
 
+static void
+data_source_update_user_dnd_action (MetaWaylandDataSource *source,
+                                    ClutterModifierType    modifiers)
+{
+  uint32_t user_dnd_action = 0;
+
+  if (modifiers & CLUTTER_SHIFT_MASK)
+    user_dnd_action = WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE;
+  else if (modifiers & CLUTTER_CONTROL_MASK)
+    user_dnd_action = WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY;
+  else if (modifiers & (CLUTTER_MOD1_MASK | CLUTTER_BUTTON2_MASK))
+    user_dnd_action = WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK;
+
+  meta_wayland_data_source_set_user_action (source, user_dnd_action);
+}
+
 static void
 drag_grab_motion (MetaWaylandPointerGrab *grab,
 		  const ClutterEvent     *event)
@@ -356,7 +579,15 @@ data_device_end_drag_grab (MetaWaylandDragGrab *drag_grab)
 
   drag_grab->seat->data_device.current_grab = NULL;
 
-  meta_wayland_pointer_end_grab (drag_grab->generic.pointer);
+  /* There might be other grabs created in result to DnD actions like popups
+   * on "ask" actions, we must not reset those, only our own.
+   */
+  if (drag_grab->generic.pointer->grab == (MetaWaylandPointerGrab *) drag_grab)
+    {
+      meta_wayland_pointer_end_grab (drag_grab->generic.pointer);
+      meta_wayland_keyboard_end_grab (drag_grab->keyboard_grab.keyboard);
+    }
+
   g_slice_free (MetaWaylandDragGrab, drag_grab);
 }
 
@@ -371,13 +602,23 @@ drag_grab_button (MetaWaylandPointerGrab *grab,
   if (drag_grab->generic.pointer->grab_button == clutter_event_get_button (event) &&
       event_type == CLUTTER_BUTTON_RELEASE)
     {
+      MetaWaylandDataSource *data_source = drag_grab->drag_data_source;
       gboolean success = FALSE;
 
-      if (meta_wayland_data_source_has_target (drag_grab->drag_data_source))
+      if (drag_grab->drag_focus &&
+          meta_wayland_data_source_get_current_action (drag_grab->drag_data_source) &&
+          meta_wayland_data_source_has_target (drag_grab->drag_data_source))
         {
           meta_wayland_surface_drag_dest_drop (drag_grab->drag_focus);
+          meta_wayland_data_source_notify_drop_performed (data_source);
           success = TRUE;
         }
+      else
+        {
+          meta_wayland_data_source_cancel (data_source);
+          meta_wayland_data_source_set_current_offer (data_source, NULL);
+          meta_wayland_data_device_set_dnd_source (&drag_grab->seat->data_device, NULL);
+        }
 
       /* Finish drag and let actor self-destruct */
       meta_dnd_actor_drag_finish (META_DND_ACTOR (drag_grab->feedback_actor),
@@ -396,6 +637,40 @@ static const MetaWaylandPointerGrabInterface drag_grab_interface = {
   drag_grab_button,
 };
 
+static gboolean
+keyboard_drag_grab_key (MetaWaylandKeyboardGrab *grab,
+                        const ClutterEvent      *event)
+{
+  return FALSE;
+}
+
+static void
+keyboard_drag_grab_modifiers (MetaWaylandKeyboardGrab *grab,
+                              ClutterModifierType      modifiers)
+{
+  MetaWaylandDragGrab *drag_grab;
+
+  drag_grab = wl_container_of (grab, drag_grab, keyboard_grab);
+
+  /* The modifiers here just contain keyboard modifiers, mix it with the
+   * mouse button modifiers we got when starting the drag operation.
+   */
+  modifiers |= drag_grab->buttons;
+
+  if (drag_grab->drag_data_source)
+    {
+      data_source_update_user_dnd_action (drag_grab->drag_data_source, modifiers);
+
+      if (drag_grab->drag_focus)
+        meta_wayland_surface_drag_dest_update (drag_grab->drag_focus);
+    }
+}
+
+static const MetaWaylandKeyboardGrabInterface keyboard_drag_grab_interface = {
+  keyboard_drag_grab_key,
+  keyboard_drag_grab_modifiers
+};
+
 static void
 destroy_data_device_origin (struct wl_listener *listener, void *data)
 {
@@ -440,12 +715,16 @@ meta_wayland_data_device_start_drag (MetaWaylandDataDevice                 *data
   MetaWaylandSeat *seat = wl_container_of (data_device, seat, data_device);
   MetaWaylandDragGrab *drag_grab;
   ClutterPoint pos, stage_pos;
+  ClutterModifierType modifiers;
 
   data_device->current_grab = drag_grab = g_slice_new0 (MetaWaylandDragGrab);
 
   drag_grab->generic.interface = funcs;
   drag_grab->generic.pointer = &seat->pointer;
 
+  drag_grab->keyboard_grab.interface = &keyboard_drag_grab_interface;
+  drag_grab->keyboard_grab.keyboard = &seat->keyboard;
+
   drag_grab->drag_client = client;
   drag_grab->seat = seat;
 
@@ -460,6 +739,11 @@ meta_wayland_data_device_start_drag (MetaWaylandDataDevice                 *data
   drag_grab->drag_start_x = stage_pos.x;
   drag_grab->drag_start_y = stage_pos.y;
 
+  modifiers = clutter_input_device_get_modifier_state (seat->pointer.device);
+  drag_grab->buttons = modifiers &
+    (CLUTTER_BUTTON1_MASK | CLUTTER_BUTTON2_MASK | CLUTTER_BUTTON3_MASK |
+     CLUTTER_BUTTON4_MASK | CLUTTER_BUTTON5_MASK);
+
   g_object_weak_ref (G_OBJECT (source),
                      drag_grab_data_source_destroyed,
                      drag_grab);
@@ -467,6 +751,7 @@ meta_wayland_data_device_start_drag (MetaWaylandDataDevice                 *data
   drag_grab->drag_data_source = source;
   meta_wayland_data_device_set_dnd_source (data_device,
                                            drag_grab->drag_data_source);
+  data_source_update_user_dnd_action (source, modifiers);
 
   if (icon_surface)
     {
@@ -548,6 +833,10 @@ data_device_start_drag (struct wl_client *client,
   meta_wayland_data_device_start_drag (data_device, client,
                                        &drag_grab_interface,
                                        surface, drag_source, icon_surface);
+
+  meta_wayland_keyboard_set_focus (&seat->keyboard, NULL);
+  meta_wayland_keyboard_start_grab (&seat->keyboard,
+                                    &seat->data_device.current_grab->keyboard_grab);
 }
 
 static void
@@ -600,6 +889,34 @@ meta_wayland_source_cancel (MetaWaylandDataSource *source)
   wl_data_source_send_cancelled (source_wayland->resource);
 }
 
+static void
+meta_wayland_source_action (MetaWaylandDataSource *source,
+                            uint32_t               action)
+{
+  MetaWaylandDataSourceWayland *source_wayland =
+    META_WAYLAND_DATA_SOURCE_WAYLAND (source);
+
+  wl_data_source_send_action (source_wayland->resource, action);
+}
+
+static void
+meta_wayland_source_drop_performed (MetaWaylandDataSource *source)
+{
+  MetaWaylandDataSourceWayland *source_wayland =
+    META_WAYLAND_DATA_SOURCE_WAYLAND (source);
+
+  wl_data_source_send_drop_performed (source_wayland->resource);
+}
+
+static void
+meta_wayland_source_drag_finished (MetaWaylandDataSource *source)
+{
+  MetaWaylandDataSourceWayland *source_wayland =
+    META_WAYLAND_DATA_SOURCE_WAYLAND (source);
+
+  wl_data_source_send_drag_finished (source_wayland->resource);
+}
+
 static void
 meta_wayland_source_finalize (GObject *object)
 {
@@ -623,6 +940,9 @@ meta_wayland_data_source_wayland_class_init (MetaWaylandDataSourceWaylandClass *
   data_source_class->send = meta_wayland_source_send;
   data_source_class->target = meta_wayland_source_target;
   data_source_class->cancel = meta_wayland_source_cancel;
+  data_source_class->action = meta_wayland_source_action;
+  data_source_class->drop_performed = meta_wayland_source_drop_performed;
+  data_source_class->drag_finished = meta_wayland_source_drag_finished;
 }
 
 static void
@@ -647,6 +967,7 @@ meta_wayland_data_source_init (MetaWaylandDataSource *source)
     meta_wayland_data_source_get_instance_private (source);
 
   wl_array_init (&priv->mime_types);
+  priv->current_dnd_action = -1;
 }
 
 static void
@@ -722,11 +1043,18 @@ meta_wayland_drag_dest_drop (MetaWaylandDataDevice *data_device,
   wl_data_device_send_drop (grab->drag_focus_data_device);
 }
 
+static void
+meta_wayland_drag_dest_update (MetaWaylandDataDevice *data_device,
+                               MetaWaylandSurface    *surface)
+{
+}
+
 static const MetaWaylandDragDestFuncs meta_wayland_drag_dest_funcs = {
   meta_wayland_drag_dest_focus_in,
   meta_wayland_drag_dest_focus_out,
   meta_wayland_drag_dest_motion,
-  meta_wayland_drag_dest_drop
+  meta_wayland_drag_dest_drop,
+  meta_wayland_drag_dest_update
 };
 
 const MetaWaylandDragDestFuncs *

src/wayland/meta-wayland-data-device.h

@@ -45,6 +45,11 @@ struct _MetaWaylandDataSourceClass
   void (* target)  (MetaWaylandDataSource *source,
                     const gchar           *mime_type);
   void (* cancel)  (MetaWaylandDataSource *source);
+
+  void (* action)         (MetaWaylandDataSource *source,
+                           uint32_t               action);
+  void (* drop_performed) (MetaWaylandDataSource *source);
+  void (* drag_finished)  (MetaWaylandDataSource *source);
 };
 
 struct _MetaWaylandDataDevice
@@ -95,6 +100,17 @@ void     meta_wayland_data_source_send           (MetaWaylandDataSource *source,
                                                   const gchar           *mime_type,
                                                   gint                   fd);
 
+void     meta_wayland_data_source_notify_finish  (MetaWaylandDataSource *source);
+
+uint32_t meta_wayland_data_source_get_actions        (MetaWaylandDataSource *source);
+uint32_t meta_wayland_data_source_get_user_action    (MetaWaylandDataSource *source);
+uint32_t meta_wayland_data_source_get_current_action (MetaWaylandDataSource *source);
+
+void     meta_wayland_data_source_set_actions        (MetaWaylandDataSource *source,
+                                                      uint32_t               dnd_actions);
+void     meta_wayland_data_source_set_current_action (MetaWaylandDataSource *source,
+                                                      uint32_t               action);
+
 const MetaWaylandDragDestFuncs *
          meta_wayland_data_device_get_drag_dest_funcs (void);
 

src/wayland/meta-wayland-versions.h

@@ -36,7 +36,7 @@
 
 /* Global/master objects (version exported by wl_registry and negotiated through bind) */
 #define META_WL_COMPOSITOR_VERSION          3
-#define META_WL_DATA_DEVICE_MANAGER_VERSION 2
+#define META_WL_DATA_DEVICE_MANAGER_VERSION 3
 #define META_XDG_SHELL_VERSION              1
 #define META_WL_SHELL_VERSION               1
 #define META_WL_SEAT_VERSION                4

src/wayland/meta-xwayland-selection.c

@@ -108,6 +108,7 @@ enum {
   ATOM_DND_ACTION_MOVE,
   ATOM_DND_ACTION_COPY,
   ATOM_DND_ACTION_ASK,
+  ATOM_DND_ACTION_PRIVATE,
   N_DND_ATOMS
 };
 
@@ -126,6 +127,7 @@ const gchar *atom_names[] = {
   "XdndActionMove",
   "XdndActionCopy",
   "XdndActionAsk",
+  "XdndActionPrivate",
   NULL
 };
 
@@ -135,6 +137,19 @@ G_DEFINE_TYPE (MetaWaylandDataSourceXWayland, meta_wayland_data_source_xwayland,
                META_TYPE_WAYLAND_DATA_SOURCE);
 
 /* XDND helpers */
+static Atom
+action_to_atom (uint32_t action)
+{
+  if (action & WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY)
+    return xdnd_atoms[ATOM_DND_ACTION_COPY];
+  else if (action & WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE)
+    return xdnd_atoms[ATOM_DND_ACTION_MOVE];
+  else if (action & WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK)
+    return xdnd_atoms[ATOM_DND_ACTION_ASK];
+  else
+    return None;
+}
+
 static void
 xdnd_send_enter (MetaXWaylandSelection *selection_data,
                  Window                 dest)
@@ -217,10 +232,21 @@ xdnd_send_position (MetaXWaylandSelection *selection_data,
                     int                    x,
                     int                    y)
 {
+  MetaWaylandCompositor *compositor = meta_wayland_compositor_get_default ();
   MetaSelectionBridge *selection = &selection_data->dnd.selection;
+  MetaWaylandDataSource *source = compositor->seat->data_device.dnd_data_source;
   Display *xdisplay = GDK_DISPLAY_XDISPLAY (gdk_display_get_default ());
+  uint32_t action = 0, user_action, actions;
   XEvent xev = { 0 };
 
+  user_action = meta_wayland_data_source_get_user_action (source);
+  actions = meta_wayland_data_source_get_actions (source);
+
+  if (user_action & actions)
+    action = user_action;
+  if (!action)
+    action = actions;
+
   xev.xclient.type = ClientMessage;
   xev.xclient.message_type = xdnd_atoms[ATOM_DND_POSITION];
   xev.xclient.format = 32;
@@ -230,7 +256,7 @@ xdnd_send_position (MetaXWaylandSelection *selection_data,
   xev.xclient.data.l[1] = 0;
   xev.xclient.data.l[2] = (x << 16) | y;
   xev.xclient.data.l[3] = time;
-  xev.xclient.data.l[4] = xdnd_atoms[ATOM_DND_ACTION_COPY];
+  xev.xclient.data.l[4] = action_to_atom (action);
 
   XSendEvent (xdisplay, dest, False, NoEventMask, &xev);
 }
@@ -262,6 +288,8 @@ xdnd_send_finished (MetaXWaylandSelection *selection_data,
 {
   MetaDndBridge *selection = &selection_data->dnd;
   Display *xdisplay = GDK_DISPLAY_XDISPLAY (gdk_display_get_default ());
+  MetaWaylandDataSource *source = selection_data->dnd.selection.source;
+  uint32_t action = 0;
   XEvent xev = { 0 };
 
   xev.xclient.type = ClientMessage;
@@ -273,8 +301,9 @@ xdnd_send_finished (MetaXWaylandSelection *selection_data,
 
   if (accepted)
     {
+      action = meta_wayland_data_source_get_current_action (source);
       xev.xclient.data.l[1] = 1; /* Drop successful */
-      xev.xclient.data.l[2] = xdnd_atoms[ATOM_DND_ACTION_COPY];
+      xev.xclient.data.l[2] = action_to_atom (action);
     }
 
   XSendEvent (xdisplay, dest, False, NoEventMask, &xev);
@@ -283,7 +312,7 @@ xdnd_send_finished (MetaXWaylandSelection *selection_data,
 static void
 xdnd_send_status (MetaXWaylandSelection *selection_data,
                   Window                 dest,
-                  gboolean               accepted)
+                  uint32_t               action)
 {
   MetaDndBridge *selection = &selection_data->dnd;
   Display *xdisplay = GDK_DISPLAY_XDISPLAY (gdk_display_get_default ());
@@ -296,12 +325,10 @@ xdnd_send_status (MetaXWaylandSelection *selection_data,
 
   xev.xclient.data.l[0] = selection->dnd_window;
   xev.xclient.data.l[1] = 1 << 1; /* Bit 2: dest wants XdndPosition messages */
+  xev.xclient.data.l[4] = action_to_atom (action);
 
-  if (accepted)
+  if (xev.xclient.data.l[4])
-    {
+    xev.xclient.data.l[1] |= 1 << 0; /* Bit 1: dest accepts the drop */
-      xev.xclient.data.l[1] |= 1 << 0; /* Bit 1: dest accepts the drop */
-      xev.xclient.data.l[4] = xdnd_atoms[ATOM_DND_ACTION_COPY];
-    }
 
   XSendEvent (xdisplay, dest, False, NoEventMask, &xev);
 }
@@ -387,6 +414,32 @@ x11_selection_data_free (X11SelectionData *data)
   g_slice_free (X11SelectionData, data);
 }
 
+static void
+x11_selection_data_send_finished (MetaSelectionBridge *selection,
+                                  gboolean             success)
+{
+  uint32_t action = meta_wayland_data_source_get_current_action (selection->source);
+
+  if (!selection->x11_selection)
+    return;
+
+  if (success && action == WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE)
+    {
+      Display *xdisplay = GDK_DISPLAY_XDISPLAY (gdk_display_get_default ());
+
+      /* Request data deletion on the drag source */
+      XConvertSelection (xdisplay,
+                         selection->selection_atom,
+                         gdk_x11_get_xatom_by_name ("DELETE"),
+                         gdk_x11_get_xatom_by_name ("_META_SELECTION"),
+                         selection->window,
+                         CurrentTime);
+    }
+
+  xdnd_send_finished (selection->x11_selection->selection_data,
+                      selection->owner, success);
+}
+
 static void
 x11_selection_data_finish (MetaSelectionBridge *selection,
                            gboolean             success)
@@ -395,13 +448,18 @@ x11_selection_data_finish (MetaSelectionBridge *selection,
     return;
 
   if (selection == &selection->x11_selection->selection_data->dnd.selection)
-    xdnd_send_finished (selection->x11_selection->selection_data,
+    x11_selection_data_send_finished (selection, success);
-                        selection->owner, success);
 
   g_clear_pointer (&selection->x11_selection,
                    (GDestroyNotify) x11_selection_data_free);
 }
 
+static void
+x11_selection_data_close (X11SelectionData *data)
+{
+  g_output_stream_close (data->stream, data->cancellable, NULL);
+}
+
 static void
 x11_data_write_cb (GObject      *object,
                    GAsyncResult *res,
@@ -435,6 +493,7 @@ x11_data_write_cb (GObject      *object,
     }
   else
     {
+      x11_selection_data_close (selection->x11_selection);
       x11_selection_data_finish (selection, success);
     }
 }
@@ -693,6 +752,7 @@ meta_xwayland_selection_get_incr_chunk (MetaWaylandCompositor *compositor,
   else
     {
       /* Transfer has completed */
+      x11_selection_data_close (selection->x11_selection);
       x11_selection_data_finish (selection, TRUE);
     }
 
@@ -741,11 +801,15 @@ meta_x11_source_target (MetaWaylandDataSource *source,
   MetaWaylandDataSourceXWayland *source_xwayland =
     META_WAYLAND_DATA_SOURCE_XWAYLAND (source);
   MetaSelectionBridge *selection = source_xwayland->selection;
+  uint32_t action = 0;
 
   if (selection->selection_atom == xdnd_atoms[ATOM_DND_SELECTION])
     {
+      if (mime_type)
+        action = meta_wayland_data_source_get_current_action (source);
+
       xdnd_send_status (compositor->xwayland_manager.selection_data,
-                        selection->owner, mime_type != NULL);
+                        selection->owner, action);
     }
 }
 
@@ -756,10 +820,46 @@ meta_x11_source_cancel (MetaWaylandDataSource *source)
     META_WAYLAND_DATA_SOURCE_XWAYLAND (source);
   MetaSelectionBridge *selection = source_xwayland->selection;
 
+  x11_selection_data_send_finished (selection, FALSE);
   g_clear_pointer (&selection->x11_selection,
                    (GDestroyNotify) x11_selection_data_free);
 }
 
+static void
+meta_x11_source_action (MetaWaylandDataSource *source,
+                        uint32_t               action)
+{
+  MetaWaylandCompositor *compositor = meta_wayland_compositor_get_default ();
+  MetaWaylandDataSourceXWayland *source_xwayland =
+    META_WAYLAND_DATA_SOURCE_XWAYLAND (source);
+  MetaSelectionBridge *selection = source_xwayland->selection;
+
+  if (selection->selection_atom == xdnd_atoms[ATOM_DND_SELECTION])
+    {
+      if (!meta_wayland_data_source_has_target (source))
+        action = 0;
+
+      xdnd_send_status (compositor->xwayland_manager.selection_data,
+                        selection->owner, action);
+    }
+}
+
+static void
+meta_x11_source_drop_performed (MetaWaylandDataSource *source)
+{
+}
+
+static void
+meta_x11_source_drag_finished (MetaWaylandDataSource *source)
+{
+  MetaWaylandDataSourceXWayland *source_xwayland =
+    META_WAYLAND_DATA_SOURCE_XWAYLAND (source);
+  MetaSelectionBridge *selection = source_xwayland->selection;
+
+  if (selection->x11_selection)
+    x11_selection_data_send_finished (selection, TRUE);
+}
+
 static void
 meta_wayland_data_source_xwayland_init (MetaWaylandDataSourceXWayland *source_xwayland)
 {
@@ -774,6 +874,9 @@ meta_wayland_data_source_xwayland_class_init (MetaWaylandDataSourceXWaylandClass
   data_source_class->send = meta_x11_source_send;
   data_source_class->target = meta_x11_source_target;
   data_source_class->cancel = meta_x11_source_cancel;
+  data_source_class->action = meta_x11_source_action;
+  data_source_class->drop_performed = meta_x11_source_drop_performed;
+  data_source_class->drag_finished = meta_x11_source_drag_finished;
 }
 
 static MetaWaylandDataSource *
@@ -837,11 +940,27 @@ meta_x11_drag_dest_drop (MetaWaylandDataDevice *data_device,
                   meta_display_get_current_time_roundtrip (meta_get_display ()));
 }
 
+static void
+meta_x11_drag_dest_update (MetaWaylandDataDevice *data_device,
+                           MetaWaylandSurface    *surface)
+{
+  MetaWaylandCompositor *compositor = meta_wayland_compositor_get_default ();
+  MetaWaylandSeat *seat = compositor->seat;
+  ClutterPoint pos;
+
+  clutter_input_device_get_coords (seat->pointer.device, NULL, &pos);
+  xdnd_send_position (compositor->xwayland_manager.selection_data,
+                      compositor->xwayland_manager.selection_data->dnd.dnd_dest,
+                      clutter_get_current_event_time (),
+                      pos.x, pos.y);
+}
+
 static const MetaWaylandDragDestFuncs meta_x11_drag_dest_funcs = {
   meta_x11_drag_dest_focus_in,
   meta_x11_drag_dest_focus_out,
   meta_x11_drag_dest_motion,
-  meta_x11_drag_dest_drop
+  meta_x11_drag_dest_drop,
+  meta_x11_drag_dest_update
 };
 
 const MetaWaylandDragDestFuncs *
@@ -1135,6 +1254,10 @@ meta_xwayland_selection_handle_selection_request (MetaWaylandCompositor *composi
                                               selection->timestamp);
       reply_selection_request (event, TRUE);
     }
+  else if (data_source && event->target == gdk_x11_get_xatom_by_name ("DELETE"))
+    {
+      meta_wayland_data_source_notify_finish (data_source);
+    }
   else
     {
       if (data_source &&
@@ -1257,6 +1380,7 @@ meta_xwayland_selection_handle_client_message (MetaWaylandCompositor *compositor
   if (event->window == dnd->selection.window)
     {
       MetaWaylandDataSource *data_source;
+      uint32_t action = 0;
 
       data_source = compositor->seat->data_device.dnd_data_source;
 
@@ -1269,6 +1393,19 @@ meta_xwayland_selection_handle_client_message (MetaWaylandCompositor *compositor
           meta_wayland_data_source_set_has_target (data_source,
                                                    (event->data.l[1] & 1) != 0);
 
+          /* data.l[4] contains the action atom */
+          if (event->data.l[4])
+            {
+              if (((Atom) event->data.l[4]) == xdnd_atoms[ATOM_DND_ACTION_COPY] ||
+                  ((Atom) event->data.l[4]) == xdnd_atoms[ATOM_DND_ACTION_PRIVATE])
+                action = WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY;
+              else if (((Atom) event->data.l[4]) == xdnd_atoms[ATOM_DND_ACTION_MOVE])
+                action = WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE;
+              else if (((Atom) event->data.l[4]) == xdnd_atoms[ATOM_DND_ACTION_ASK])
+                action = WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK;
+            }
+
+          meta_wayland_data_source_set_current_action (data_source, action);
           return TRUE;
         }
       else if (event->message_type == xdnd_atoms[ATOM_DND_FINISHED])
@@ -1277,8 +1414,7 @@ meta_xwayland_selection_handle_client_message (MetaWaylandCompositor *compositor
           if (compositor->seat->data_device.current_grab)
             return FALSE;
 
-          meta_wayland_data_device_set_dnd_source (&compositor->seat->data_device,
+          meta_wayland_data_source_notify_finish (data_source);
-                                                   NULL);
           return TRUE;
         }
     }
@@ -1338,6 +1474,7 @@ meta_xwayland_selection_handle_client_message (MetaWaylandCompositor *compositor
         {
           ClutterEvent *motion;
           ClutterPoint pos;
+          uint32_t action = 0;
 
           motion = clutter_event_new (CLUTTER_MOTION);
           clutter_input_device_get_coords (seat->pointer.device, NULL, &pos);
@@ -1346,11 +1483,19 @@ meta_xwayland_selection_handle_client_message (MetaWaylandCompositor *compositor
           clutter_event_set_source_device (motion, seat->pointer.device);
           clutter_event_set_time (motion, dnd->last_motion_time);
 
+          if ((Atom) event->data.l[4] == xdnd_atoms[ATOM_DND_ACTION_COPY])
+            action = WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY;
+          else if ((Atom) event->data.l[4] == xdnd_atoms[ATOM_DND_ACTION_MOVE])
+            action = WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE;
+          else if ((Atom) event->data.l[4] == xdnd_atoms[ATOM_DND_ACTION_ASK])
+            action = WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK;
+
+          meta_wayland_data_source_set_actions (dnd->selection.source, action);
+
           meta_wayland_surface_drag_dest_motion (drag_focus, motion);
           xdnd_send_status (compositor->xwayland_manager.selection_data,
                             (Window) event->data.l[0],
-                            meta_wayland_data_source_has_target (
+                            meta_wayland_data_source_get_current_action (dnd->selection.source));
-                              dnd->selection.source));
 
           clutter_event_free (motion);
           return TRUE;