tracklist: Use the Texture Cache for album art

Replacing our tracklist-specific one that caches textures, but not to
local disk.

Implements #53 ("Convert the TrackList to use the Texture Cache")
Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

emmental/tracklist/row.py

@@ -4,10 +4,10 @@ import datetime
 import dateutil.tz
 import pathlib
 from gi.repository import GObject
-from gi.repository import Gdk
 from gi.repository import Gtk
 from .. import buttons
 from .. import factory
+from .. import texture
 
 
 class TrackRow(factory.ListRow):
@@ -278,8 +278,6 @@ class MediumString(InscriptionRow):
 class AlbumCover(TrackRow):
     """A Track Row to display Album art."""
 
-    Cache = dict()
-
     filepath = GObject.Property(type=GObject.TYPE_PYOBJECT)
 
     def __init__(self, listitem: Gtk.ListItem, property: str):
@@ -293,19 +291,14 @@ class AlbumCover(TrackRow):
         match param.name:
             case "mediumid": self.rebind_album("filepath", to_self=True)
             case "filepath":
-                if self.filepath is None:
-                    texture = None
-                elif (texture := AlbumCover.Cache.get(self.filepath)) is None:
-                    texture = Gdk.Texture.new_from_filename(str(self.filepath))
-                    AlbumCover.Cache[self.filepath] = texture
-
-                self.child.set_paintable(texture)
-                self.child.set_has_tooltip(texture is not None)
+                tex = texture.CACHE[self.filepath]
+                self.child.set_paintable(tex)
+                self.child.set_has_tooltip(tex is not None)
 
     def __query_tooltip(self, child: Gtk.Picture, x: int, y: int,
                         keyboard_mode: bool, tooltip: Gtk.Tooltip) -> bool:
-        texture = AlbumCover.Cache.get(self.filepath)
-        tooltip.set_custom(Gtk.Picture.new_for_paintable(texture))
+        tex = texture.CACHE[self.filepath]
+        tooltip.set_custom(Gtk.Picture.new_for_paintable(tex))
         return True
 
     def do_bind(self) -> None:

tests/tracklist/test_row.py

@@ -8,7 +8,6 @@ import emmental.tracklist.row
 import tests.util
 import unittest.mock
 from gi.repository import GObject
-from gi.repository import Gdk
 from gi.repository import Gtk
 from gi.repository import Adw
 
@@ -193,9 +192,6 @@ class TestTrackRowWidgets(tests.util.TestCase):
 
     def test_album_cover(self):
         """Test the Album Cover widget."""
-        self.assertDictEqual(emmental.tracklist.row.AlbumCover.Cache, {})
-        cache = emmental.tracklist.row.AlbumCover.Cache
-
         row = emmental.tracklist.row.AlbumCover(self.listitem, "cover")
         self.assertIsInstance(row, emmental.tracklist.row.TrackRow)
         self.assertIsInstance(row.child, Gtk.Picture)
@@ -206,10 +202,9 @@ class TestTrackRowWidgets(tests.util.TestCase):
         row.bind()
         self.assertEqual(row.filepath, tests.util.COVER_JPG)
 
-        self.assertEqual(len(cache), 1)
-        self.assertIsInstance(cache[tests.util.COVER_JPG], Gdk.Texture)
+        self.assertEqual(len(emmental.texture.CACHE), 1)
         self.assertEqual(row.child.get_paintable(),
-                         cache[tests.util.COVER_JPG])
+                         emmental.texture.CACHE[tests.util.COVER_JPG])
         self.assertTrue(row.child.get_has_tooltip())
 
         self.album.cover = None