[mutter/gnome-3-36] wayland: Move MetaWaylandDataOffer to its own file
- From: Robert Mader <rmader src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [mutter/gnome-3-36] wayland: Move MetaWaylandDataOffer to its own file
- Date: Wed, 24 Jun 2020 20:21:28 +0000 (UTC)
commit b52a0be2880a0bed428f620f65f40082a1afe348
Author: Carlos Garnacho <carlosg gnome org>
Date: Thu Apr 9 16:22:21 2020 +0200
wayland: Move MetaWaylandDataOffer to its own file
This is still an openly defined struct, as we will need accessed
by "subclasses". Same principle applies than with the
MetaWaylandDataSource refactor, this is not meant to introduce
functional changes, so just go with it.
On the bright side, the interactions are now clearer, so it could
be made saner in the future.
https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1193
(cherry picked from commit 91ef7515de688d47ee30265a6651987bae352fc3)
src/meson.build | 2 +
src/wayland/meta-wayland-data-device.c | 290 +++--------------------------
src/wayland/meta-wayland-data-device.h | 3 +-
src/wayland/meta-wayland-data-offer.c | 326 +++++++++++++++++++++++++++++++++
src/wayland/meta-wayland-data-offer.h | 50 +++++
5 files changed, 400 insertions(+), 271 deletions(-)
---
diff --git a/src/meson.build b/src/meson.build
index c1ea1e399d..8ae0c56c68 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -495,6 +495,8 @@ if have_wayland
'wayland/meta-wayland-cursor-surface.h',
'wayland/meta-wayland-data-device.c',
'wayland/meta-wayland-data-device.h',
+ 'wayland/meta-wayland-data-offer.c',
+ 'wayland/meta-wayland-data-offer.h',
'wayland/meta-wayland-data-source.c',
'wayland/meta-wayland-data-source.h',
'wayland/meta-wayland-data-source-primary.c',
diff --git a/src/wayland/meta-wayland-data-device.c b/src/wayland/meta-wayland-data-device.c
index be8f53f0a2..11c0d799e7 100644
--- a/src/wayland/meta-wayland-data-device.c
+++ b/src/wayland/meta-wayland-data-device.c
@@ -47,22 +47,6 @@
#define ROOTWINDOW_DROP_MIME "application/x-rootwindow-drop"
-#define ALL_ACTIONS (WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY | \
- WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE | \
- WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK)
-
-struct _MetaWaylandDataOffer
-{
- struct wl_resource *resource;
- MetaWaylandDataSource *source;
- struct wl_listener source_destroy_listener;
- gboolean accepted;
- gboolean action_sent;
- uint32_t dnd_actions;
- enum wl_data_device_manager_dnd_action preferred_dnd_action;
- MetaSelectionType selection_type;
-};
-
static void unset_selection_source (MetaWaylandDataDevice *data_device,
MetaSelectionType selection_type);
@@ -80,85 +64,6 @@ unbind_resource (struct wl_resource *resource)
wl_list_remove (wl_resource_get_link (resource));
}
-static enum wl_data_device_manager_dnd_action
-data_offer_choose_action (MetaWaylandDataOffer *offer)
-{
- MetaWaylandDataSource *source = offer->source;
- uint32_t actions, user_action, available_actions;
-
- if (wl_resource_get_version (offer->resource) <
- WL_DATA_OFFER_ACTION_SINCE_VERSION)
- return WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY;
-
- meta_wayland_data_source_get_actions (source, &actions);
- user_action = meta_wayland_data_source_get_user_action (source);
-
- available_actions = actions & offer->dnd_actions;
-
- if (!available_actions)
- return WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE;
-
- /* 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);
-}
-
-void
-meta_wayland_data_offer_update_action (MetaWaylandDataOffer *offer)
-{
- enum wl_data_device_manager_dnd_action current_action, action;
- MetaWaylandDataSource *source;
-
- if (!offer->source)
- return;
-
- source = offer->source;
- current_action = meta_wayland_data_source_get_current_action (source);
- action = data_offer_choose_action (offer);
-
- if (current_action == action)
- return;
-
- meta_wayland_data_source_set_current_action (source, action);
-
- if (!meta_wayland_data_source_get_in_ask (source) &&
- wl_resource_get_version (offer->resource) >=
- WL_DATA_OFFER_ACTION_SINCE_VERSION)
- {
- wl_data_offer_send_action (offer->resource, action);
- offer->action_sent = TRUE;
- }
-}
-
-static void
-data_offer_accept (struct wl_client *client,
- struct wl_resource *resource,
- guint32 serial,
- const char *mime_type)
-{
- MetaWaylandDataOffer *offer = wl_resource_get_user_data (resource);
-
- /* FIXME: Check that client is currently focused by the input
- * device that is currently dragging this data source. Should
- * this be a wl_data_device request? */
-
- if (offer->source)
- {
- meta_wayland_data_source_target (offer->source, mime_type);
- meta_wayland_data_source_set_has_target (offer->source,
- mime_type != NULL);
- }
-
- offer->accepted = mime_type != NULL;
-}
-
static void
transfer_cb (MetaSelection *selection,
GAsyncResult *res,
@@ -175,42 +80,6 @@ transfer_cb (MetaSelection *selection,
g_output_stream_close (stream, NULL, NULL);
}
-static void
-data_offer_receive (struct wl_client *client, struct wl_resource *resource,
- const char *mime_type, int32_t fd)
-{
- MetaWaylandDataOffer *offer = wl_resource_get_user_data (resource);
- MetaDisplay *display = meta_get_display ();
- MetaSelectionType selection_type;
- GList *mime_types;
- gboolean found;
-
- selection_type = offer->selection_type;
- mime_types = meta_selection_get_mimetypes (meta_display_get_selection (display),
- selection_type);
- found = g_list_find_custom (mime_types, mime_type, (GCompareFunc) g_strcmp0) != NULL;
- g_list_free_full (mime_types, g_free);
-
- if (found)
- {
- GOutputStream *stream;
-
- stream = g_unix_output_stream_new (fd, TRUE);
- meta_selection_transfer_async (meta_display_get_selection (display),
- selection_type,
- mime_type,
- -1,
- stream,
- NULL,
- (GAsyncReadyCallback) transfer_cb,
- stream);
- }
- else
- {
- close (fd);
- }
-}
-
static void
default_destructor (struct wl_client *client,
struct wl_resource *resource)
@@ -218,79 +87,6 @@ default_destructor (struct wl_client *client,
wl_resource_destroy (resource);
}
-static void
-data_offer_finish (struct wl_client *client,
- struct wl_resource *resource)
-{
- MetaWaylandDataOffer *offer = wl_resource_get_user_data (resource);
- enum wl_data_device_manager_dnd_action current_action;
-
- if (!offer->source ||
- offer != meta_wayland_data_source_get_current_offer (offer->source))
- return;
-
- if (!offer->accepted || !offer->action_sent)
- {
- wl_resource_post_error (offer->resource,
- WL_DATA_OFFER_ERROR_INVALID_FINISH,
- "premature finish request");
- return;
- }
-
- current_action = meta_wayland_data_source_get_current_action (offer->source);
-
- if (current_action == WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE ||
- current_action == WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK)
- {
- wl_resource_post_error (offer->resource,
- WL_DATA_OFFER_ERROR_INVALID_OFFER,
- "offer finished with an invalid action");
- return;
- }
-
- meta_wayland_data_source_notify_finish (offer->source);
-}
-
-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 (dnd_actions & ~(ALL_ACTIONS))
- {
- wl_resource_post_error (offer->resource,
- WL_DATA_OFFER_ERROR_INVALID_ACTION_MASK,
- "invalid actions mask %x", dnd_actions);
- return;
- }
-
- if (preferred_action &&
- (!(preferred_action & dnd_actions) ||
- __builtin_popcount (preferred_action) > 1))
- {
- wl_resource_post_error (offer->resource,
- WL_DATA_OFFER_ERROR_INVALID_ACTION,
- "invalid action %x", preferred_action);
- return;
- }
-
- offer->dnd_actions = dnd_actions;
- offer->preferred_dnd_action = preferred_action;
-
- meta_wayland_data_offer_update_action (offer);
-}
-
-static const struct wl_data_offer_interface data_offer_interface = {
- data_offer_accept,
- data_offer_receive,
- default_destructor,
- data_offer_finish,
- data_offer_set_actions,
-};
-
static void
primary_offer_receive (struct wl_client *client, struct wl_resource *resource,
const char *mime_type, int32_t fd)
@@ -327,42 +123,6 @@ static const struct gtk_primary_selection_offer_interface primary_offer_interfac
default_destructor,
};
-static void
-destroy_data_offer (struct wl_resource *resource)
-{
- MetaWaylandDataOffer *offer = wl_resource_get_user_data (resource);
- MetaWaylandSeat *seat;
-
- if (offer->source)
- {
- seat = meta_wayland_data_source_get_seat (offer->source);
-
- if (offer == meta_wayland_data_source_get_current_offer (offer->source))
- {
- if (seat->data_device.dnd_data_source == offer->source)
- {
- if (wl_resource_get_version (offer->resource) <
- WL_DATA_OFFER_ACTION_SINCE_VERSION)
- meta_wayland_data_source_notify_finish (offer->source);
- else if (meta_wayland_data_source_get_drop_performed (offer->source))
- meta_wayland_data_source_cancel (offer->source);
- }
- else
- {
- meta_wayland_data_source_set_current_offer (offer->source, NULL);
- meta_wayland_data_source_set_has_target (offer->source, FALSE);
- }
- }
-
- 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);
-}
-
static void
destroy_primary_offer (struct wl_resource *resource)
{
@@ -391,30 +151,23 @@ create_and_send_dnd_offer (MetaWaylandDataSource *source,
{
MetaWaylandDataOffer *offer = g_slice_new0 (MetaWaylandDataOffer);
struct wl_array *mime_types;
+ struct wl_resource *resource;
char **p;
- offer->selection_type = META_SELECTION_DND;
- offer->source = source;
- g_object_add_weak_pointer (G_OBJECT (source), (gpointer *)&offer->source);
- offer->resource = wl_resource_create (wl_resource_get_client (target),
- &wl_data_offer_interface,
- wl_resource_get_version (target), 0);
- wl_resource_set_implementation (offer->resource,
- &data_offer_interface,
- offer,
- destroy_data_offer);
+ offer = meta_wayland_data_offer_new (META_SELECTION_DND, source, target);
+ resource = meta_wayland_data_offer_get_resource (offer);
- wl_data_device_send_data_offer (target, offer->resource);
+ wl_data_device_send_data_offer (target, resource);
mime_types = meta_wayland_data_source_get_mime_types (source);
wl_array_for_each (p, mime_types)
- wl_data_offer_send_offer (offer->resource, *p);
+ wl_data_offer_send_offer (resource, *p);
meta_wayland_data_offer_update_action (offer);
meta_wayland_data_source_set_current_offer (source, offer);
- return offer->resource;
+ return resource;
}
struct _MetaWaylandDragGrab {
@@ -1031,8 +784,10 @@ meta_wayland_drag_dest_focus_in (MetaWaylandDataDevice *data_device,
MetaWaylandDataOffer *offer)
{
MetaWaylandDragGrab *grab = data_device->current_grab;
+ MetaWaylandDataSource *source;
struct wl_display *display;
struct wl_client *client;
+ struct wl_resource *resource;
uint32_t source_actions;
wl_fixed_t sx, sy;
@@ -1046,18 +801,21 @@ meta_wayland_drag_dest_focus_in (MetaWaylandDataDevice *data_device,
wl_resource_add_destroy_listener (grab->drag_focus_data_device,
&grab->drag_focus_listener);
- if (wl_resource_get_version (offer->resource) >=
+ resource = meta_wayland_data_offer_get_resource (offer);
+
+ if (wl_resource_get_version (resource) >=
WL_DATA_OFFER_SOURCE_ACTIONS_SINCE_VERSION)
{
- meta_wayland_data_source_get_actions (offer->source, &source_actions);
- wl_data_offer_send_source_actions (offer->resource, source_actions);
+ source = meta_wayland_data_offer_get_source (offer);
+ meta_wayland_data_source_get_actions (source, &source_actions);
+ wl_data_offer_send_source_actions (resource, source_actions);
}
meta_wayland_pointer_get_relative_coordinates (grab->generic.pointer,
surface, &sx, &sy);
wl_data_device_send_enter (grab->drag_focus_data_device,
wl_display_next_serial (display),
- surface->resource, sx, sy, offer->resource);
+ surface->resource, sx, sy, resource);
}
static void
@@ -1504,6 +1262,7 @@ create_and_send_clipboard_offer (MetaWaylandDataDevice *data_device,
{
MetaWaylandDataOffer *offer;
MetaDisplay *display = meta_get_display ();
+ struct wl_resource *resource;
GList *mimetypes, *l;
mimetypes = meta_selection_get_mimetypes (meta_display_get_selection (display),
@@ -1511,24 +1270,17 @@ create_and_send_clipboard_offer (MetaWaylandDataDevice *data_device,
if (!mimetypes)
return NULL;
- offer = g_slice_new0 (MetaWaylandDataOffer);
- offer->selection_type = META_SELECTION_CLIPBOARD;
- offer->resource = wl_resource_create (wl_resource_get_client (target),
- &wl_data_offer_interface,
- wl_resource_get_version (target), 0);
- wl_resource_set_implementation (offer->resource,
- &data_offer_interface,
- offer,
- destroy_data_offer);
+ offer = meta_wayland_data_offer_new (META_SELECTION_CLIPBOARD, NULL, target);
+ resource = meta_wayland_data_offer_get_resource (offer);
- wl_data_device_send_data_offer (target, offer->resource);
+ wl_data_device_send_data_offer (target, resource);
for (l = mimetypes; l; l = l->next)
- wl_data_offer_send_offer (offer->resource, l->data);
+ wl_data_offer_send_offer (resource, l->data);
g_list_free_full (mimetypes, g_free);
- return offer->resource;
+ return resource;
}
static struct wl_resource *
diff --git a/src/wayland/meta-wayland-data-device.h b/src/wayland/meta-wayland-data-device.h
index d6563ab09e..292cf56c45 100644
--- a/src/wayland/meta-wayland-data-device.h
+++ b/src/wayland/meta-wayland-data-device.h
@@ -28,6 +28,7 @@
#include "clutter/clutter.h"
#include "meta/meta-selection-source.h"
+#include "wayland/meta-wayland-data-offer.h"
#include "wayland/meta-wayland-data-source.h"
#include "wayland/meta-wayland-types.h"
@@ -93,6 +94,4 @@ MetaWaylandSurface *
void meta_wayland_drag_grab_update_feedback_actor (MetaWaylandDragGrab *drag_grab,
ClutterEvent *event);
-void meta_wayland_data_offer_update_action (MetaWaylandDataOffer *offer);
-
#endif /* META_WAYLAND_DATA_DEVICE_H */
diff --git a/src/wayland/meta-wayland-data-offer.c b/src/wayland/meta-wayland-data-offer.c
new file mode 100644
index 0000000000..800d55144a
--- /dev/null
+++ b/src/wayland/meta-wayland-data-offer.c
@@ -0,0 +1,326 @@
+/*
+ * Copyright © 2011 Kristian Høgsberg
+ * 2020 Red Hat Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission. The copyright holders make no representations
+ * about the suitability of this software for any purpose. It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <gio/gunixoutputstream.h>
+#include <glib-unix.h>
+#include <glib.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "meta/meta-selection.h"
+#include "wayland/meta-wayland-data-device.h"
+#include "wayland/meta-wayland-private.h"
+
+#include "meta-wayland-data-offer.h"
+
+#define ALL_ACTIONS (WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY | \
+ WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE | \
+ WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK)
+
+static void
+data_offer_accept (struct wl_client *client,
+ struct wl_resource *resource,
+ guint32 serial,
+ const char *mime_type)
+{
+ MetaWaylandDataOffer *offer = wl_resource_get_user_data (resource);
+
+ /* FIXME: Check that client is currently focused by the input
+ * device that is currently dragging this data source. Should
+ * this be a wl_data_device request? */
+
+ if (offer->source)
+ {
+ meta_wayland_data_source_target (offer->source, mime_type);
+ meta_wayland_data_source_set_has_target (offer->source,
+ mime_type != NULL);
+ }
+
+ offer->accepted = mime_type != NULL;
+}
+
+static void
+transfer_cb (MetaSelection *selection,
+ GAsyncResult *res,
+ GOutputStream *stream)
+{
+ GError *error = NULL;
+
+ if (!meta_selection_transfer_finish (selection, res, &error))
+ {
+ g_warning ("Could not fetch selection data: %s", error->message);
+ g_error_free (error);
+ }
+
+ g_output_stream_close (stream, NULL, NULL);
+}
+
+static void
+data_offer_receive (struct wl_client *client, struct wl_resource *resource,
+ const char *mime_type, int32_t fd)
+{
+ MetaWaylandDataOffer *offer = wl_resource_get_user_data (resource);
+ MetaDisplay *display = meta_get_display ();
+ MetaSelectionType selection_type;
+ GList *mime_types;
+ gboolean found;
+
+ selection_type = offer->selection_type;
+ mime_types = meta_selection_get_mimetypes (meta_display_get_selection (display),
+ selection_type);
+ found = g_list_find_custom (mime_types, mime_type, (GCompareFunc) g_strcmp0) != NULL;
+ g_list_free_full (mime_types, g_free);
+
+ if (found)
+ {
+ GOutputStream *stream;
+
+ stream = g_unix_output_stream_new (fd, TRUE);
+ meta_selection_transfer_async (meta_display_get_selection (display),
+ selection_type,
+ mime_type,
+ -1,
+ stream,
+ NULL,
+ (GAsyncReadyCallback) transfer_cb,
+ stream);
+ }
+ else
+ {
+ close (fd);
+ }
+}
+
+static void
+data_offer_destroy (struct wl_client *client,
+ struct wl_resource *resource)
+{
+ wl_resource_destroy (resource);
+}
+
+static void
+data_offer_finish (struct wl_client *client,
+ struct wl_resource *resource)
+{
+ MetaWaylandDataOffer *offer = wl_resource_get_user_data (resource);
+ enum wl_data_device_manager_dnd_action current_action;
+
+ if (!offer->source ||
+ offer != meta_wayland_data_source_get_current_offer (offer->source))
+ return;
+
+ if (!offer->accepted || !offer->action_sent)
+ {
+ wl_resource_post_error (offer->resource,
+ WL_DATA_OFFER_ERROR_INVALID_FINISH,
+ "premature finish request");
+ return;
+ }
+
+ current_action = meta_wayland_data_source_get_current_action (offer->source);
+
+ if (current_action == WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE ||
+ current_action == WL_DATA_DEVICE_MANAGER_DND_ACTION_ASK)
+ {
+ wl_resource_post_error (offer->resource,
+ WL_DATA_OFFER_ERROR_INVALID_OFFER,
+ "offer finished with an invalid action");
+ return;
+ }
+
+ meta_wayland_data_source_notify_finish (offer->source);
+}
+
+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 (dnd_actions & ~(ALL_ACTIONS))
+ {
+ wl_resource_post_error (offer->resource,
+ WL_DATA_OFFER_ERROR_INVALID_ACTION_MASK,
+ "invalid actions mask %x", dnd_actions);
+ return;
+ }
+
+ if (preferred_action &&
+ (!(preferred_action & dnd_actions) ||
+ __builtin_popcount (preferred_action) > 1))
+ {
+ wl_resource_post_error (offer->resource,
+ WL_DATA_OFFER_ERROR_INVALID_ACTION,
+ "invalid action %x", preferred_action);
+ return;
+ }
+
+ offer->dnd_actions = dnd_actions;
+ offer->preferred_dnd_action = preferred_action;
+
+ meta_wayland_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_finish,
+ data_offer_set_actions,
+};
+
+static void
+destroy_data_offer (struct wl_resource *resource)
+{
+ MetaWaylandDataOffer *offer = wl_resource_get_user_data (resource);
+ MetaWaylandSeat *seat;
+
+ if (offer->source)
+ {
+ seat = meta_wayland_data_source_get_seat (offer->source);
+
+ if (offer == meta_wayland_data_source_get_current_offer (offer->source))
+ {
+ if (seat->data_device.dnd_data_source == offer->source)
+ {
+ if (wl_resource_get_version (offer->resource) <
+ WL_DATA_OFFER_ACTION_SINCE_VERSION)
+ meta_wayland_data_source_notify_finish (offer->source);
+ else if (meta_wayland_data_source_get_drop_performed (offer->source))
+ meta_wayland_data_source_cancel (offer->source);
+ }
+ else
+ {
+ meta_wayland_data_source_set_current_offer (offer->source, NULL);
+ meta_wayland_data_source_set_has_target (offer->source, FALSE);
+ }
+ }
+
+ 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);
+}
+
+MetaWaylandDataOffer *
+meta_wayland_data_offer_new (MetaSelectionType selection_type,
+ MetaWaylandDataSource *source,
+ struct wl_resource *target)
+{
+ MetaWaylandDataOffer *offer;
+
+ offer = g_slice_new0 (MetaWaylandDataOffer);
+ offer->selection_type = selection_type;
+ offer->resource = wl_resource_create (wl_resource_get_client (target),
+ &wl_data_offer_interface,
+ wl_resource_get_version (target), 0);
+ wl_resource_set_implementation (offer->resource,
+ &data_offer_interface,
+ offer,
+ destroy_data_offer);
+ if (source)
+ {
+ offer->source = source;
+ g_object_add_weak_pointer (G_OBJECT (source), (gpointer *)&offer->source);
+ }
+
+ return offer;
+}
+
+static enum wl_data_device_manager_dnd_action
+data_offer_choose_action (MetaWaylandDataOffer *offer)
+{
+ MetaWaylandDataSource *source = offer->source;
+ uint32_t actions, user_action, available_actions;
+
+ if (wl_resource_get_version (offer->resource) <
+ WL_DATA_OFFER_ACTION_SINCE_VERSION)
+ return WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY;
+
+ meta_wayland_data_source_get_actions (source, &actions);
+ user_action = meta_wayland_data_source_get_user_action (source);
+
+ available_actions = actions & offer->dnd_actions;
+
+ if (!available_actions)
+ return WL_DATA_DEVICE_MANAGER_DND_ACTION_NONE;
+
+ /* 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);
+}
+
+void
+meta_wayland_data_offer_update_action (MetaWaylandDataOffer *offer)
+{
+ enum wl_data_device_manager_dnd_action current_action, action;
+ MetaWaylandDataSource *source;
+
+ if (!offer->source)
+ return;
+
+ source = offer->source;
+ current_action = meta_wayland_data_source_get_current_action (source);
+ action = data_offer_choose_action (offer);
+
+ if (current_action == action)
+ return;
+
+ meta_wayland_data_source_set_current_action (source, action);
+
+ if (!meta_wayland_data_source_get_in_ask (source) &&
+ wl_resource_get_version (offer->resource) >=
+ WL_DATA_OFFER_ACTION_SINCE_VERSION)
+ {
+ wl_data_offer_send_action (offer->resource, action);
+ offer->action_sent = TRUE;
+ }
+}
+
+struct wl_resource *
+meta_wayland_data_offer_get_resource (MetaWaylandDataOffer *offer)
+{
+ return offer->resource;
+}
+
+MetaWaylandDataSource *
+meta_wayland_data_offer_get_source (MetaWaylandDataOffer *offer)
+{
+ return offer->source;
+}
diff --git a/src/wayland/meta-wayland-data-offer.h b/src/wayland/meta-wayland-data-offer.h
new file mode 100644
index 0000000000..07824c1e0c
--- /dev/null
+++ b/src/wayland/meta-wayland-data-offer.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright © 2011 Kristian Høgsberg
+ * 2020 Red Hat Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission. The copyright holders make no representations
+ * about the suitability of this software for any purpose. It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#ifndef META_WAYLAND_DATA_OFFER_H
+#define META_WAYLAND_DATA_OFFER_H
+
+#include "wayland/meta-wayland-data-source.h"
+
+struct _MetaWaylandDataOffer
+{
+ struct wl_resource *resource;
+ MetaWaylandDataSource *source;
+ struct wl_listener source_destroy_listener;
+ gboolean accepted;
+ gboolean action_sent;
+ uint32_t dnd_actions;
+ enum wl_data_device_manager_dnd_action preferred_dnd_action;
+ MetaSelectionType selection_type;
+};
+
+MetaWaylandDataOffer * meta_wayland_data_offer_new (MetaSelectionType selection_type,
+ MetaWaylandDataSource *source,
+ struct wl_resource *resource);
+
+void meta_wayland_data_offer_update_action (MetaWaylandDataOffer *offer);
+
+struct wl_resource * meta_wayland_data_offer_get_resource (MetaWaylandDataOffer *offer);
+MetaWaylandDataSource * meta_wayland_data_offer_get_source (MetaWaylandDataOffer *offer);
+
+#endif /* META_WAYLAND_DATA_OFFER_H */
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