tracklist: Request a Track when it is activated

And wire up a handler for the factory track-requested signal in the main
application code.

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

emmental/__init__.py

@@ -105,6 +105,10 @@ class Application(Adw.Application):
         self.__load_track(self.factory.previous_track(),
                           rg_auto="track", restart=True)
 
+    def __track_requested(self, factory: playlist.Factory, track,
+                          rg_auto: str, restarted: bool) -> None:
+        self.__load_track(track, rg_auto=rg_auto, restart=restarted)
+
     def __tracks_table_loaded(self, track_table, param) -> None:
         if track_table.current_track is not None:
             self.player.file = track_table.current_track.path
@@ -225,6 +229,7 @@ class Application(Adw.Application):
                                         self.factory, "db-previous")
         self.win.sidebar.bind_property("selected-playlist",
                                        self.factory, "db-visible")
+        self.factory.connect("track-requested", self.__track_requested)
 
     def connect_player(self) -> None:
         """Connect the audio.Player."""

emmental/tracklist/trackview.py

@@ -55,6 +55,7 @@ class TrackView(Gtk.Frame):
         self._selection.bind_property("n-items", self, "n-tracks")
 
         self._selection.connect("items-changed", self.__runtime_changed)
+        self._columnview.connect("activate", self.__track_activated)
         self._columnview.add_css_class("emmental-track-list")
 
         self.set_child(self._scrollwin)
@@ -71,6 +72,11 @@ class TrackView(Gtk.Frame):
                           position: int, removed: int, added: int) -> None:
         self.runtime = sum(t.length for t in self._selection)
 
+    def __track_activated(self, columnview: Gtk.ColumnView,
+                          position: int) -> None:
+        self.playlist.request_track(self._selection[position])
+        self._selection.unselect_all()
+
     @GObject.Property(type=Gio.ListModel)
     def columns(self) -> Gio.ListModel:
         """Get the ListModel for the columns."""

tests/tracklist/test_trackview.py

@@ -1,6 +1,7 @@
 # Copyright 2022 (c) Anna Schumaker.
 """Tests our Track ColumnView."""
 import pathlib
+import unittest.mock
 import emmental.tracklist.trackview
 import tests.util
 from gi.repository import Gtk
@@ -61,6 +62,20 @@ class TestTrackView(tests.util.TestCase):
         self.assertTrue(self.trackview._columnview.has_css_class(
                         "emmental-track-list"))
 
+    def test_track_activated(self):
+        """Test activating a row in the columnview."""
+        requested = unittest.mock.Mock()
+        self.playlist.connect("track-requested", requested)
+        self.trackview.playlist = self.playlist
+        self.trackview._selection.set_model(self.playlist)
+        self.db_plist.add_track(self.track)
+
+        with unittest.mock.patch.object(self.trackview._selection,
+                                        "unselect_all") as mock_unselect:
+            self.trackview._columnview.emit("activate", 0)
+            requested.assert_called_with(self.playlist, self.track)
+            mock_unselect.assert_called()
+
     def test_playlist(self):
         """Test the playlist property."""
         self.assertIsNone(self.trackview.playlist)