[gnome-music/wip/mschraal/artrework: 2/3] albumartcache: Fix MPRIS thumbnail retrieval

[Marinus Schraal <mschraal src gnome org>]

commit 3d36090f1349da683f6c6e76ca58b3adc0155537
Author: Marinus Schraal <mschraal gnome org>
Date:   Sun Jan 28 16:34:00 2018 +0100

    albumartcache: Fix MPRIS thumbnail retrieval

 gnomemusic/albumartcache.py | 13 +++++++++++++
 gnomemusic/player.py        |  4 ++--
 2 files changed, 15 insertions(+), 2 deletions(-)
---
diff --git a/gnomemusic/albumartcache.py b/gnomemusic/albumartcache.py
index 373ceb3..d312bb1 100644
--- a/gnomemusic/albumartcache.py
+++ b/gnomemusic/albumartcache.py
@@ -263,6 +263,7 @@ class Art(GObject.GObject):
 
         surface = _make_icon_frame(pixbuf, self._size, self._scale)
         self._surface = surface
+        self._set_grilo_thumbnail_path()
 
         self.emit('finished')
 
@@ -333,6 +334,18 @@ class Art(GObject.GObject):
 
         return False
 
+    def _set_grilo_thumbnail_path(self):
+        # TODO: This sets the thumbnail path for the Grilo Media object
+        # to be used by MPRIS. However, calling this by default for
+        # every cache hit is unnecessary.
+        album = utils.get_album_title(self._media)
+        artist = utils.get_artist_name(self._media)
+
+        success, thumb_file = MediaArt.get_file(artist, album, "album")
+        if success:
+            self._media.set_thumbnail(
+                GLib.filename_to_uri(thumb_file.get_path(), None))
+
     @GObject.Property
     @log
     def surface(self):
diff --git a/gnomemusic/player.py b/gnomemusic/player.py
index 8bd0478..ca5a119 100644
--- a/gnomemusic/player.py
+++ b/gnomemusic/player.py
@@ -580,6 +580,7 @@ class Player(GObject.GObject):
         self.artistLabel.set_label(artist)
 
         art = ArtImage(Art.Size.XSMALL, media)
+        art.connect('finished', self._on_art_finished)
         art.image = self._image
 
         title = utils.get_media_title(media)
@@ -633,8 +634,7 @@ class Player(GObject.GObject):
         return False
 
     @log
-    def _on_cache_lookup(self, surface, data=None):
-        # FIXME: Need this for mpris
+    def _on_art_finished(self, klass):
         self.emit('thumbnail-updated')
 
     @log