Adds functionality to flet_video to know what song is playing (#3772)

* Flet video typo fix on on_completed handler

* Flet_video added on_track_changed to get track playing

* Changed event from track to track_changed

* Updated Comment name as well on python end

packages/flet_video/lib/src/video.dart

@@ -68,6 +68,12 @@ class _VideoControlState extends State<VideoControl> with FletStoreMixin {
       .triggerControlEvent(widget.control.id, "completed", message ?? "");
   }
 
+  void _onTrackChanged(String? message) {
+  debugPrint("Video onTrackChanged: $message");
+  widget.backend
+      .triggerControlEvent(widget.control.id, "track_changed", message ?? "");
+  }
+
   @override
   Widget build(BuildContext context) {
     debugPrint("Video build: ${widget.control.id}");
@@ -98,7 +104,7 @@ class _VideoControlState extends State<VideoControl> with FletStoreMixin {
 
       bool onError = widget.control.attrBool("onError", false)!;
       bool onCompleted = widget.control.attrBool("onCompleted", false)!;
-
+      bool onTrackChanged = widget.control.attrBool("onTrackChanged", false)!;
 
       double? volume = widget.control.attrDouble("volume");
       double? pitch = widget.control.attrDouble("pitch");
@@ -272,8 +278,14 @@ class _VideoControlState extends State<VideoControl> with FletStoreMixin {
           _onCompleted(event.toString());
         }
       });
-
+
+      player.stream.playlist.listen((event) {
+        if (onTrackChanged) {
+          _onTrackChanged(event.index.toString());
+        }
+      });
+
       return constrainedControl(context, video, widget.parent, widget.control);
     });
   }
-}
+}

sdk/python/packages/flet-core/src/flet_core/video.py

@@ -91,6 +91,7 @@ def __init__(
         on_exit_fullscreen: OptionalEventCallable = None,
         on_error: OptionalEventCallable = None,
         on_completed: OptionalEventCallable = None,
+        on_track_changed: OptionalEventCallable = None,
 
         #
         # ConstrainedControl
@@ -175,6 +176,7 @@ def __init__(
         self.on_loaded = on_loaded
         self.on_error = on_error
         self.on_completed = on_completed
+        self.on_track_changed = on_track_changed
 
 
     def _get_control_name(self):
@@ -601,3 +603,13 @@ def on_completed(self) -> OptionalControlEventCallable:
     def on_completed(self, handler: OptionalControlEventCallable):
         self._set_attr("onCompleted", True if handler is not None else None)
         self._add_event_handler("completed", handler)
+
+    # on_track_changed
+    @property
+    def on_track_changed(self) -> OptionalControlEventCallable:
+        return self._get_event_handler("track_changed")
+
+    @on_track_changed.setter
+    def on_track_changed(self, handler: OptionalControlEventCallable):
+        self._set_attr("onTrackChanged", True if handler is not None else None)
+        self._add_event_handler("track_changed", handler)