[gnome-music] playlistview: Refactor current playlist check

[Marinus Schraal <mschraal src gnome org>]

commit b44df6b56aed43d6fe301f81a4ad6683e15ded93
Author: Jean Felder <jean felder gmail com>
Date:   Sun Jan 28 17:30:21 2018 +0100

    playlistview: Refactor current playlist check

 gnomemusic/views/playlistview.py | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)
---
diff --git a/gnomemusic/views/playlistview.py b/gnomemusic/views/playlistview.py
index 5eda4ab..af57942 100644
--- a/gnomemusic/views/playlistview.py
+++ b/gnomemusic/views/playlistview.py
@@ -405,7 +405,7 @@ class PlaylistView(BaseView):
         for row in self._sidebar:
             playlist = row.playlist
             if (str(playlist_id) == playlist.get_id()
-                    and self.current_playlist == playlist):
+                    and self._is_current_playlist(playlist)):
                 GLib.idle_add(self._on_playlist_activated, self._sidebar, row)
                 break
 
@@ -553,6 +553,14 @@ class PlaylistView(BaseView):
         else:
             return False
 
+    @log
+    def _is_current_playlist(self, playlist):
+        """Check if playlist is currently displayed"""
+        if (self.current_playlist
+                and playlist.get_id() == self.current_playlist.get_id()):
+            return True
+        return False
+
     @log
     def _stage_playlist_for_deletion(self):
         self.model.clear()
@@ -628,22 +636,19 @@ class PlaylistView(BaseView):
 
     @log
     def _on_song_added_to_playlist(self, playlists, playlist, item):
-        if (self.current_playlist
-                and playlist.get_id() == self.current_playlist.get_id()):
+        if self._is_current_playlist(playlist):
             self._add_song_to_model(item, self.model)
 
     @log
     def _on_song_removed_from_playlist(self, playlists, playlist, item):
-        if (self.current_playlist
-                and playlist.get_id() == self.current_playlist.get_id()):
+        if self._is_current_playlist(playlist):
             model = self.model
         else:
             return
 
         # checks if the to be removed track is now being played
         def is_playing(row):
-            if (self.current_playlist
-                    and playlist.get_id() == self.current_playlist.get_id()):
+            if self._is_current_playlist(playlist):
                 if (self.player.currentTrack is not None
                         and self.player.currentTrack.valid()):
                     track_path = self.player.currentTrack.get_path()