Video optimizations (#18)

* use events for `VideoTrackRenderer`

* logger

* implemented visibility detection

* optimize code with 1 param debounce func

* stop pending visibility event when disposed

* clean up

* mark internal

* report to track

* call dispose on pub and track

* use internal events to receive visibility events

* clean up visibility for disposed track

* listen to track visibility events on pub

* re-design

* quickly re-enable

* clean up

* clean up

example/lib/widgets/participant.dart

@@ -27,6 +27,7 @@ class _ParticipantWidgetState extends State<ParticipantWidget> {
   //
   TrackPublication? firstVideoPub;
   TrackPublication? firstAudioPub;
+  bool _visible = true;
 
   @override
   void initState() {
@@ -79,14 +80,17 @@ class _ParticipantWidgetState extends State<ParticipantWidget> {
         child: Stack(
           children: [
             // Video
-            if (firstVideoPub?.subscribed == true &&
-                firstVideoPub?.muted == false)
-              VideoTrackRenderer(
-                firstVideoPub!.track as VideoTrack,
-                fit: RTCVideoViewObjectFit.RTCVideoViewObjectFitCover,
-              )
-            else
-              const NoVideoWidget(),
+            InkWell(
+              onTap: () => setState(() => _visible = !_visible),
+              child: (firstVideoPub?.subscribed == true &&
+                      firstVideoPub?.muted == false &&
+                      _visible)
+                  ? VideoTrackRenderer(
+                      firstVideoPub!.track as VideoTrack,
+                      fit: RTCVideoViewObjectFit.RTCVideoViewObjectFitCover,
+                    )
+                  : const NoVideoWidget(),
+            ),
 
             Align(
               alignment: Alignment.bottomCenter,

example/pubspec.lock

@@ -406,6 +406,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0"
+  visibility_detector:
+    dependency: transitive
+    description:
+      name: visibility_detector
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.2"
   win32:
     dependency: transitive
     description:

example/pubspec.yaml

@@ -21,6 +21,9 @@ dependencies:
 
   livekit_client:
     path: ../
+    # git:
+    #   url: https://github.com/livekit/client-sdk-flutter
+    #   ref: main
 
 dev_dependencies:
   flutter_test: