修复SMTC显示重复播放器的问题 (#1446)

* 修复SMTC显示重复播放器的问题

* 修复SMTC在直播下的暂停问题

src/ViewModels/ViewModels.Uwp/Core/FFmpegPlayerViewModel/FFmpegPlayerViewModel.Methods.cs

@@ -70,11 +70,9 @@ namespace Bili.ViewModels.Uwp.Core
             {
                 _audioPlaybackItem = _audioFFSource.CreateMediaPlaybackItem();
                 _mediaTimelineController = GetTimelineController();
-                _videoPlayer.CommandManager.IsEnabled = false;
                 _videoPlayer.TimelineController = _mediaTimelineController;
 
                 _audioPlayer = GetAudioPlayer();
-                _audioPlayer.CommandManager.IsEnabled = false;
                 _audioPlayer.Source = _audioPlaybackItem;
                 _audioPlayer.TimelineController = _mediaTimelineController;
             }
@@ -141,6 +139,7 @@ namespace Bili.ViewModels.Uwp.Core
             player.CurrentStateChanged += OnMediaPlayerCurrentStateChangedAsync;
             player.MediaEnded += OnMediaPlayerEndedAsync;
             player.MediaFailed += OnMediaPlayerFailedAsync;
+            player.CommandManager.IsEnabled = false;
             return player;
         }
 
@@ -148,6 +147,7 @@ namespace Bili.ViewModels.Uwp.Core
         {
             var player = new MediaPlayer();
             player.MediaFailed += OnMediaPlayerFailedAsync;
+            player.CommandManager.IsEnabled = false;
             return player;
         }
 

src/ViewModels/ViewModels.Uwp/Core/FFmpegPlayerViewModel/FFmpegPlayerViewModel.cs

@@ -69,6 +69,14 @@ namespace Bili.ViewModels.Uwp.Core
             }
             else
             {
+                if (_videoPlayer != null
+                    && _videoPlayer.TimelineController == null
+                    && _videoPlayer.PlaybackSession != null
+                    && _videoPlayer.PlaybackSession.CanPause)
+                {
+                    _videoPlayer.Pause();
+                }
+
                 if (_audioPlayer != null
                     && _audioPlayer.TimelineController == null
                     && _audioPlayer.PlaybackSession != null

src/ViewModels/ViewModels.Uwp/Core/MediaPlayerViewModel/MediaPlayerViewModel.Live.cs

@@ -95,7 +95,7 @@ namespace Bili.ViewModels.Uwp.Core
         private async Task InitializeLivePlayerAsync(string url)
         {
             await _player.SetSourceAsync(url);
-            StartTimersAndDisplayRequest();
+            StartTimers();
         }
 
         private async Task ChangeLiveAudioOnlyAsync(bool isAudioOnly)

src/ViewModels/ViewModels.Uwp/Core/MediaPlayerViewModel/MediaPlayerViewModel.Method.cs

@@ -49,6 +49,7 @@ namespace Bili.ViewModels.Uwp.Core
 
             if (_systemMediaTransportControls != null)
             {
+                _systemMediaTransportControls.DisplayUpdater.ClearAll();
                 _systemMediaTransportControls.IsEnabled = false;
                 _systemMediaTransportControls = null;
             }
@@ -118,7 +119,7 @@ namespace Bili.ViewModels.Uwp.Core
             }
         }
 
-        private void StartTimersAndDisplayRequest()
+        private void StartTimers()
         {
             _progressTimer?.Start();
             _unitTimer?.Start();
@@ -259,6 +260,7 @@ namespace Bili.ViewModels.Uwp.Core
             }
 
             var updater = _systemMediaTransportControls.DisplayUpdater;
+            updater.ClearAll();
             updater.Type = MediaPlaybackType.Video;
             updater.Thumbnail = Windows.Storage.Streams.RandomAccessStreamReference.CreateFromUri(new Uri(cover));
             updater.VideoProperties.Title = title;

src/ViewModels/ViewModels.Uwp/Core/MediaPlayerViewModel/MediaPlayerViewModel.Video.cs

@@ -29,7 +29,7 @@ namespace Bili.ViewModels.Uwp.Core
             ResetPlayer();
             ResetMediaData();
             await LoadVideoAsync();
-            StartTimersAndDisplayRequest();
+            StartTimers();
         }
 
         private async Task LoadVideoAsync()
@@ -143,7 +143,7 @@ namespace Bili.ViewModels.Uwp.Core
             try
             {
                 await _player.SetSourceAsync(_video, _audio);
-                StartTimersAndDisplayRequest();
+                StartTimers();
             }
             catch (Exception ex)
             {