修复按下空格键有时无法播放/暂停的问题

src/App/Controls/Player/BiliPlayerTransportControls/BiliPlayerTransportControls.Properties.cs

@@ -65,6 +65,7 @@ public partial class BiliPlayerTransportControls
         private DispatcherTimer _danmakuTimer;
         private DispatcherTimer _cursorTimer;
         private DispatcherTimer _normalTimer;
+        private DispatcherTimer _focusTimer;
         private DanmakuView _danmakuView;
         private ToggleButton _fullWindowPlayModeButton;
         private ToggleButton _fullScreenPlayModeButton;

src/App/Controls/Player/BiliPlayerTransportControls/BiliPlayerTransportControls.cs

@@ -40,8 +40,10 @@ public BiliPlayerTransportControls()
             InitializeDanmakuTimer();
             InitializeCursorTimer();
             InitializeNormalTimer();
+            InitializeFocusTimer();
 
             _normalTimer.Start();
+            _focusTimer.Start();
         }
 
         /// <summary>
@@ -406,6 +408,8 @@ private void CheckCurrentPlayerMode()
                 default:
                     break;
             }
+
+            _playPauseButton.Focus(FocusState.Programmatic);
         }
 
         private void OnDanmakuListAdded(object sender, List<DanmakuElem> e)
@@ -510,6 +514,8 @@ private async void OnPlaybackStateChangedAsync(MediaPlaybackSession sender, obje
                     _danmakuView.ResumeDanmaku();
                     Hide();
                 }
+
+                _playPauseButton.Focus(FocusState.Programmatic);
             });
         }
 
@@ -548,6 +554,16 @@ private void InitializeNormalTimer()
             }
         }
 
+        private void InitializeFocusTimer()
+        {
+            if (_focusTimer == null)
+            {
+                _focusTimer = new DispatcherTimer();
+                _focusTimer.Interval = TimeSpan.FromSeconds(5);
+                _focusTimer.Tick += OnFocusTimerTick;
+            }
+        }
+
         private void InitializeDanmaku(List<DanmakuElem> elements)
         {
             var list = new List<DanmakuModel>();
@@ -759,6 +775,14 @@ private void OnNormalTimerTick(object sender, object e)
             }
         }
 
+        private void OnFocusTimerTick(object sender, object e)
+        {
+            if (ViewModel.PlayerDisplayMode != PlayerDisplayMode.Default)
+            {
+                _playPauseButton.Focus(FocusState.Programmatic);
+            }
+        }
+
         private void OnInteractionControlManipulationCompleted(object sender, ManipulationCompletedRoutedEventArgs e)
         {
             _manipulationVolume = 0;