Player controls now get dynamically assigned to view model base classes.

This gives view models more freedom in how play events from the player are handled

Aurora/Services/PlayerService/PlayerService.cs

@@ -34,6 +34,19 @@ namespace Aurora.Services.PlayerService
             get { return _state; }
         }
 
+        public bool IsLoaded
+        {
+            get
+            {
+                return this._currentMedia == null;
+            }
+        }
+
+        public bool IsMediaLoaded(BaseMedia media)
+        {
+            return _currentMedia == media;
+        }
+
         /// <summary>
         /// Load media into the media player.
         /// </summary>
@@ -51,7 +64,11 @@ namespace Aurora.Services.PlayerService
             _mediaPlayer.Stopped += OnStopped;
             md.Dispose();
 
-            MediaChanged.Invoke(this, new MediaChangedEventArgs(_currentMedia.Metadata));
+            if (MediaChanged != null)
+            {
+                MediaChanged.Invoke(this, new MediaChangedEventArgs(_currentMedia.Metadata));
+            }
+
         }
 
         /// <summary>
@@ -62,7 +79,11 @@ namespace Aurora.Services.PlayerService
             PlaybackState oldState = _state;
             _state = PlaybackState.Playing;
             _mediaPlayer.Play();
-            PlaybackStateChanged.Invoke(this, new PlaybackStateChangedEventArgs(oldState, _state));
+
+            if (PlaybackStateChanged != null)
+            {
+                PlaybackStateChanged.Invoke(this, new PlaybackStateChangedEventArgs(oldState, _state));
+            }
         }
 
         /// <summary>
@@ -73,7 +94,11 @@ namespace Aurora.Services.PlayerService
             PlaybackState oldState = _state;
             _state = PlaybackState.Buffering;
             _mediaPlayer.Pause();
-            PlaybackStateChanged.Invoke(this, new PlaybackStateChangedEventArgs(oldState, _state));
+
+            if (PlaybackStateChanged != null)
+            {
+                PlaybackStateChanged.Invoke(this, new PlaybackStateChangedEventArgs(oldState, _state));
+            }
         }
 
         /// <summary>
@@ -84,7 +109,12 @@ namespace Aurora.Services.PlayerService
             PlaybackState oldState = _state;
             _state = PlaybackState.Stopped;
             _mediaPlayer.Stop();
-            PlaybackStateChanged.Invoke(this, new PlaybackStateChangedEventArgs(oldState, _state));
+
+            if (PlaybackStateChanged != null)
+            {
+                PlaybackStateChanged.Invoke(this, new PlaybackStateChangedEventArgs(oldState, _state));
+            }
+
         }
 
         public void Enqueue(BaseMedia song)
@@ -103,6 +133,7 @@ namespace Aurora.Services.PlayerService
         private void Unload()
         {
             _currentMedia.Unload();
+            _currentMedia = null;
             _mediaPlayer.Media = null;
             _mediaPlayer = null;
         }