Add seeked event

mopidy/backends/base/playback.py

@@ -484,7 +484,10 @@ class PlaybackController(object):
         self.play_time_started = self._current_wall_time
         self.play_time_accumulated = time_position
 
-        return self.provider.seek(time_position)
+        success = self.provider.seek(time_position)
+        if success:
+            self._trigger_seeked()
+        return success
 
     def stop(self, clear_current_track=False):
         """
@@ -540,6 +543,10 @@ class PlaybackController(object):
         logger.debug(u'Triggering options changed event')
         BackendListener.send('options_changed')
 
+    def _trigger_seeked(self):
+        logger.debug(u'Triggering seeked event')
+        BackendListener.send('seeked')
+
 
 class BasePlaybackProvider(object):
     """

mopidy/listeners.py

@@ -105,3 +105,12 @@ class BackendListener(object):
         *MAY* be implemented by actor.
         """
         pass
+
+    def seeked(self):
+        """
+        Called whenever the time position changes by an unexpected amount, e.g.
+        at seek to a new time position.
+
+        *MAY* be implemented by actor.
+        """
+        pass

tests/listeners_test.py

@@ -30,3 +30,6 @@ class BackendListenerTest(unittest.TestCase):
 
     def test_listener_has_default_impl_for_volume_changed(self):
         self.listener.volume_changed()
+
+    def test_listener_has_default_impl_for_seeked(self):
+        self.listener.seeked()