[gnome-music/wip/mschraal/player-factor-out-gstreamer: 15/42] use state property changed signal

[Marinus Schraal <mschraal src gnome org>]

commit 5385fd5420c857cae5c2b82d6d98e0cf4b9bb563
Author: Marinus Schraal <mschraal gnome org>
Date:   Fri Feb 9 09:52:14 2018 +0100

    use state property changed signal

 gnomemusic/gstplayer.py | 6 +-----
 gnomemusic/player.py    | 7 ++++++-
 2 files changed, 7 insertions(+), 6 deletions(-)
---
diff --git a/gnomemusic/gstplayer.py b/gnomemusic/gstplayer.py
index 0b6986a..8a2b5ee 100644
--- a/gnomemusic/gstplayer.py
+++ b/gnomemusic/gstplayer.py
@@ -52,15 +52,13 @@ class GstPlayer(GObject.GObject):
     }
 
     @log
-    def __init__(self, player):
+    def __init__(self):
         super().__init__()
 
         Gst.init(None)
 
         self._settings = Gio.Settings.new('org.gnome.Music')
 
-        self._super_player = player
-
         self._player = Gst.ElementFactory.make('playbin', 'player')
         self._bus = self._player.get_bus()
         self._bus.add_signal_watch()
@@ -136,8 +134,6 @@ class GstPlayer(GObject.GObject):
         # message. In practice, self means only Gst.State.PLAYING and
         # Gst.State.PAUSED are.
         self.state = self.state
-        self._super_player._sync_playing()
-
 
     @log
     def _on_bus_element(self, bus, message):
diff --git a/gnomemusic/player.py b/gnomemusic/player.py
index b9ba3f7..96768c0 100644
--- a/gnomemusic/player.py
+++ b/gnomemusic/player.py
@@ -120,8 +120,9 @@ class Player(GObject.GObject):
         self.playlist_insert_handler = 0
         self.playlist_delete_handler = 0
 
-        self._player = GstPlayer(self)
+        self._player = GstPlayer()
         self._player.connect('eos', self._on_eos)
+        self._player.connect('notify::state', self._on_state_change)
 
         self._lastfm = LastFmScrobbler()
 
@@ -311,6 +312,10 @@ class Player(GObject.GObject):
     def playing(self):
         return self._player.is_playing()
 
+    @log
+    def _on_state_change(self, klass, arguments):
+        self._sync_playing()
+
     @log
     def _sync_playing(self):
         if self._player.is_playing():