audio: Add a custom TrackTitle label

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

audio/nowplaying.py

@@ -1,5 +1,18 @@
 # Copyright 2021 (c) Anna Schumaker.
-from gi.repository import GLib, Gtk
+from gi.repository import GLib
+from gi.repository import Gtk
+
+class TrackTitle(Gtk.Label):
+    def __init__(self, player):
+        Gtk.Label.__init__(self)
+        player.connect("track-changed", self.on_track_changed)
+        self.on_track_changed(player, None, player.track)
+        self.add_css_class("title")
+
+    def on_track_changed(self, player, old, new):
+        text = new.title if new else "Emmental"
+        self.set_markup(f"<big>{GLib.markup_escape_text(text)}</big>")
+
 
 class NowPlaying(Gtk.ScrolledWindow):
     def __init__(self):

audio/test_nowplaying.py

@@ -1,7 +1,35 @@
 # Copyright 2021 (c) Anna Schumaker.
-from . import nowplaying
-from gi.repository import Gtk
 import unittest
+from gi.repository import GObject
+from gi.repository import Gtk
+from . import nowplaying
+
+class FakeTrack(GObject.GObject):
+    def __init__(self):
+        GObject.GObject.__init__(self)
+        self.title = "Test Title"
+
+class FakePlayer(GObject.GObject):
+    def __init__(self):
+        GObject.GObject.__init__(self)
+        self.track = None
+
+    @GObject.Signal(arg_types=(FakeTrack,FakeTrack))
+    def track_changed(self, prev, new): pass
+
+
+class TestAudioTrackTitle(unittest.TestCase):
+    def test_track_title(self):
+        fake  = FakePlayer()
+        title = nowplaying.TrackTitle(fake)
+
+        self.assertIsInstance(title, Gtk.Label)
+        self.assertTrue(title.has_css_class("title"))
+        self.assertEqual(title.get_text(), "Emmental")
+
+        fake.emit("track-changed", None, FakeTrack())
+        self.assertEqual(title.get_text(), "Test Title")
+
 
 class TestNowPlaying(unittest.TestCase):
     def test_now_playing_init(self):