wayland: Simplify MetaSelectionSourceWayland

Instead of taking resource and send/cancel funcs, take a
MetaWaylandDataSource, which exposes all the vfuncs to do the same on the
internal resource.

This has the added side effect that only MetaWaylandDataSource has a
pointer to the wl_resource, which may be unset untimely.

Fixes: https://gitlab.gnome.org/GNOME/mutter/issues/842

src/wayland/meta-selection-source-wayland-private.h

@@ -25,6 +25,8 @@
 #include <wayland-server.h>
 
 #include "meta/meta-selection-source.h"
+#include "wayland/meta-wayland-data-device.h"
+#include "wayland/meta-wayland-data-device-private.h"
 
 #define META_TYPE_SELECTION_SOURCE_WAYLAND (meta_selection_source_wayland_get_type ())
 
@@ -33,14 +35,6 @@ G_DECLARE_FINAL_TYPE (MetaSelectionSourceWayland,
                       META, SELECTION_SOURCE_WAYLAND,
                       MetaSelectionSource)
 
-typedef void (* MetaWaylandSendFunc) (struct wl_resource *resource,
+MetaSelectionSource * meta_selection_source_wayland_new (MetaWaylandDataSource *source);
-                                      const char         *mimetype,
-                                      int                 fd);
-typedef void (* MetaWaylandCancelFunc) (struct wl_resource *resource);
-
-MetaSelectionSource * meta_selection_source_wayland_new (struct wl_resource    *resource,
-                                                         GList                 *mime_types,
-                                                         MetaWaylandSendFunc    send_func,
-                                                         MetaWaylandCancelFunc  cancel_func);
 
 #endif /* META_SELECTION_SOURCE_WAYLAND_H */

src/wayland/meta-selection-source-wayland.c

@@ -29,10 +29,8 @@
 struct _MetaSelectionSourceWayland
 {
   MetaSelectionSource parent_instance;
+  MetaWaylandDataSource *data_source;
   GList *mimetypes;
-  MetaWaylandSendFunc send_func;
-  MetaWaylandCancelFunc cancel_func;
-  struct wl_resource *resource;
 };
 
 G_DEFINE_TYPE (MetaSelectionSourceWayland, meta_selection_source_wayland,
@@ -85,7 +83,8 @@ meta_selection_source_wayland_read_async (MetaSelectionSource *source,
   g_task_set_source_tag (task, meta_selection_source_wayland_read_async);
 
   stream = g_unix_input_stream_new (pipe_fds[0], TRUE);
-  source_wayland->send_func (source_wayland->resource, mimetype, pipe_fds[1]);
+  meta_wayland_data_source_send (source_wayland->data_source,
+                                 mimetype, pipe_fds[1]);
   close (pipe_fds[1]);
 
   g_task_return_pointer (task, stream, g_object_unref);
@@ -119,7 +118,7 @@ meta_selection_source_wayland_deactivated (MetaSelectionSource *source)
   MetaSelectionSourceWayland *source_wayland =
     META_SELECTION_SOURCE_WAYLAND (source);
 
-  source_wayland->cancel_func (source_wayland->resource);
+  meta_wayland_data_source_cancel (source_wayland->data_source);
   META_SELECTION_SOURCE_CLASS (meta_selection_source_wayland_parent_class)->deactivated (source);
 }
 
@@ -143,20 +142,29 @@ meta_selection_source_wayland_init (MetaSelectionSourceWayland *source)
 {
 }
 
+static GList *
+copy_string_array_to_list (struct wl_array *array)
+{
+  GList *l = NULL;
+  char **p;
+
+  wl_array_for_each (p, array)
+    l = g_list_prepend (l, g_strdup (*p));
+
+  return l;
+}
+
 MetaSelectionSource *
-meta_selection_source_wayland_new (struct wl_resource    *resource,
+meta_selection_source_wayland_new (MetaWaylandDataSource *data_source)
-                                   GList                 *mime_types,
-                                   MetaWaylandSendFunc    send_func,
-                                   MetaWaylandCancelFunc  cancel_func)
 {
   MetaSelectionSourceWayland *source_wayland;
+  struct wl_array *mimetypes;
 
   source_wayland = g_object_new (META_TYPE_SELECTION_SOURCE_WAYLAND, NULL);
-  source_wayland->mimetypes = g_list_copy_deep (mime_types,
+  source_wayland->data_source = data_source;
-                                                (GCopyFunc) g_strdup, NULL);
+
-  source_wayland->send_func = send_func;
+  mimetypes = meta_wayland_data_source_get_mime_types (data_source);
-  source_wayland->cancel_func = cancel_func;
+  source_wayland->mimetypes = copy_string_array_to_list (mimetypes);
-  source_wayland->resource = resource;
 
   return META_SELECTION_SOURCE (source_wayland);
 }

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

@@ -250,7 +250,7 @@ meta_wayland_data_source_get_mime_types (const MetaWaylandDataSource *source)
   return &priv->mime_types;
 }
 
-static void
+void
 meta_wayland_data_source_cancel (MetaWaylandDataSource *source)
 {
   META_WAYLAND_DATA_SOURCE_GET_CLASS (source)->cancel (source);
@@ -1152,18 +1152,6 @@ destroy_data_device_icon (struct wl_listener *listener, void *data)
     clutter_actor_remove_all_children (drag_grab->feedback_actor);
 }
 
-static GList *
-copy_string_array_to_list (struct wl_array *array)
-{
-  GList *l = NULL;
-  char **p;
-
-  wl_array_for_each (p, array)
-    l = g_list_prepend (l, g_strdup (*p));
-
-  return l;
-}
-
 void
 meta_wayland_data_device_start_drag (MetaWaylandDataDevice                 *data_device,
                                      struct wl_client                      *client,
@@ -1263,7 +1251,6 @@ data_device_start_drag (struct wl_client *client,
   MetaWaylandSurface *surface = NULL, *icon_surface = NULL;
   MetaWaylandDataSource *drag_source = NULL;
   MetaSelectionSource *selection_source;
-  GList *mimetypes;
 
   if (origin_resource)
     surface = wl_resource_get_user_data (origin_resource);
@@ -1299,12 +1286,7 @@ data_device_start_drag (struct wl_client *client,
       return;
     }
 
-  mimetypes = copy_string_array_to_list (meta_wayland_data_source_get_mime_types (drag_source));
+  selection_source = meta_selection_source_wayland_new (drag_source);
-  selection_source = meta_selection_source_wayland_new (source_resource,
-                                                        mimetypes,
-                                                        wl_data_source_send_send,
-                                                        wl_data_source_send_cancelled);
-  g_list_free_full (mimetypes, g_free);
   set_selection_source (data_device, META_SELECTION_DND,
                         selection_source);
   g_object_unref (selection_source);
@@ -1664,23 +1646,14 @@ meta_wayland_data_device_set_selection (MetaWaylandDataDevice *data_device,
 
   if (source)
     {
-      MetaWaylandDataSourceWayland *source_wayland =
-        META_WAYLAND_DATA_SOURCE_WAYLAND (source);
       MetaSelectionSource *selection_source;
-      GList *mimetypes;
 
       meta_wayland_data_source_set_seat (source, seat);
       g_object_weak_ref (G_OBJECT (source),
                          selection_data_source_destroyed,
                          data_device);
 
-      mimetypes = copy_string_array_to_list (meta_wayland_data_source_get_mime_types (source));
+      selection_source = meta_selection_source_wayland_new (source);
-      selection_source = meta_selection_source_wayland_new (source_wayland->resource,
-                                                            mimetypes,
-                                                            wl_data_source_send_send,
-                                                            wl_data_source_send_cancelled);
-      g_list_free_full (mimetypes, g_free);
-
       set_selection_source (data_device, META_SELECTION_CLIPBOARD,
                             selection_source);
       g_object_unref (selection_source);
@@ -1805,20 +1778,13 @@ meta_wayland_data_device_set_primary (MetaWaylandDataDevice *data_device,
   if (source)
     {
       MetaSelectionSource *selection_source;
-      GList *mimetypes;
 
       meta_wayland_data_source_set_seat (source, seat);
       g_object_weak_ref (G_OBJECT (source),
                          primary_source_destroyed,
                          data_device);
 
-      mimetypes = copy_string_array_to_list (meta_wayland_data_source_get_mime_types (source));
+      selection_source = meta_selection_source_wayland_new (source);
-      selection_source = meta_selection_source_wayland_new (META_WAYLAND_DATA_SOURCE_WAYLAND (source)->resource,
-                                                            mimetypes,
-                                                            gtk_primary_selection_source_send_send,
-                                                            gtk_primary_selection_source_send_cancelled);
-      g_list_free_full (mimetypes, g_free);
-
       set_selection_source (data_device, META_SELECTION_PRIMARY,
                             selection_source);
       g_object_unref (selection_source);

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

@@ -111,6 +111,8 @@ gboolean meta_wayland_data_source_has_target     (MetaWaylandDataSource *source)
 void     meta_wayland_data_source_set_has_target (MetaWaylandDataSource *source,
                                                   gboolean               has_target);
 
+void     meta_wayland_data_source_cancel         (MetaWaylandDataSource *source);
+
 void     meta_wayland_data_source_send           (MetaWaylandDataSource *source,
                                                   const gchar           *mime_type,
                                                   gint                   fd);