[gnome-music/wip/mschraal/tageditor-13feb2020: 18/25] coregrilo: Add a callback function to writeback

[Marinus Schraal <mschraal src gnome org>]

commit fd344fc896231be919c9e06f82b86f511b4f8f40
Author: Jean Felder <jfelder src gnome org>
Date:   Sun Nov 24 15:09:11 2019 +0100

    coregrilo: Add a callback function to writeback

 gnomemusic/coregrilo.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/gnomemusic/coregrilo.py b/gnomemusic/coregrilo.py
index 75c15527..ec7b3597 100644
--- a/gnomemusic/coregrilo.py
+++ b/gnomemusic/coregrilo.py
@@ -180,7 +180,7 @@ class CoreGrilo(GObject.GObject):
         for wrapper in self._wrappers.values():
             wrapper.populate_album_disc_songs(media, discnr, callback)
 
-    def _store_metadata(self, source, media, keys):
+    def _store_metadata(self, source, media, data):
         """Convenience function to store metadata
 
         Wrap the metadata store call in a idle_add compatible form.
@@ -189,6 +189,7 @@ class CoreGrilo(GObject.GObject):
         :param list keys: A list of Grilo metadata keys
         """
         # FIXME: Doing this async crashes.
+        keys, callback = data
         try:
             source.store_metadata_sync(
                 media, keys, Grl.WriteFlags.NORMAL)
@@ -196,18 +197,22 @@ class CoreGrilo(GObject.GObject):
             self._log.warning(
                 "Error {}: {}".format(error.domain, error.message))
 
+        if callback is not None:
+            callback()
         return GLib.SOURCE_REMOVE
 
-    def writeback(self, media, keys):
+    def writeback(self, media, keys, callback=None):
         """Store the values associated with the keys.
 
         :param Grl.Media media: A Grilo media item
         :param list keys: A list of Grilo metadata keys
+        :param function callback: callback function
         """
+        data = [keys, callback]
         for wrapper in self._wrappers.values():
             if media.get_source() == wrapper.source.props.source_id:
                 GLib.idle_add(
-                    self._store_metadata, wrapper.props.source, media, keys)
+                    self._store_metadata, wrapper.props.source, media, data)
                 break
 
     def search(self, text):