feat(windows): add topSeek parms mentioned in docs (#4456)

Author: Lyqqt

windows/ReactNativeVideoCPP/ReactVideoView.cpp

@@ -88,6 +88,14 @@ ReactVideoView::ReactVideoView(winrt::Microsoft::ReactNative::IReactContext cons
       }
     }
   });
+
+  m_positionChangedToken = m_player.PlaybackSession().PositionChanged(
+      winrt::auto_revoke, [ref = get_weak()](auto const& sender, auto const& args) {
+        if (auto self = ref.get()) {
+          auto newPosition = sender.Position().count();
+          self->m_mediaPlayerPosition = newPosition;
+        }
+      });
 }
 
 void ReactVideoView::OnMediaOpened(IInspectable const &, IInspectable const &) {
@@ -155,7 +163,22 @@ void ReactVideoView::OnBufferingEnded(IInspectable const &, IInspectable const &
 void ReactVideoView::OnSeekCompleted(IInspectable const &, IInspectable const &) {
   runOnQueue([weak_this{get_weak()}]() {
     if (auto strong_this{weak_this.get()}) {
-      strong_this->m_reactContext.DispatchEvent(*strong_this, L"topVideoSeek", nullptr);
+      if (auto mediaPlayer = strong_this->m_player) {
+        auto currentTimeInSeconds = mediaPlayer.PlaybackSession().Position().count() / 10000000;
+        auto seekTimeInSeconds = strong_this->m_mediaPlayerPosition / 10000000;
+
+        strong_this->m_reactContext.DispatchEvent(
+          *strong_this,
+          L"topVideoSeek",
+          [&](winrt::Microsoft::ReactNative::IJSValueWriter const &eventDataWriter) noexcept {
+            eventDataWriter.WriteObjectBegin();
+            {
+              WriteProperty(eventDataWriter, L"currentTime", currentTimeInSeconds);
+              WriteProperty(eventDataWriter, L"seekTime", seekTimeInSeconds);
+            }
+            eventDataWriter.WriteObjectEnd();
+          });
+      }
     }
   });
 }

windows/ReactNativeVideoCPP/ReactVideoView.h

@@ -29,6 +29,7 @@ struct ReactVideoView : ReactVideoViewT<ReactVideoView> {
   bool m_fullScreen = false;
   double m_volume = 0;
   double m_position = 0;
+  double m_mediaPlayerPosition = 0;
   Windows::UI::Xaml::DispatcherTimer m_timer;
   Windows::Media::Playback::MediaPlayer m_player = nullptr;
   Windows::UI::Core::CoreDispatcher m_uiDispatcher = nullptr;
@@ -40,6 +41,7 @@ struct ReactVideoView : ReactVideoViewT<ReactVideoView> {
   Windows::Media::Playback::MediaPlaybackSession::BufferingStarted_revoker m_bufferingStartedToken{};
   Windows::Media::Playback::MediaPlaybackSession::BufferingEnded_revoker m_bufferingEndedToken{};
   Windows::Media::Playback::MediaPlaybackSession::SeekCompleted_revoker m_seekCompletedToken{};
+  Windows::Media::Playback::MediaPlaybackSession::PositionChanged_revoker m_positionChangedToken{};
 
   bool IsPlaying(Windows::Media::Playback::MediaPlaybackState currentState);
   void OnMediaOpened(IInspectable const &sender, IInspectable const &args);