added legal state bar content

lib/util/watchState.dart

@@ -0,0 +1,12 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+class WatchState<T> extends StatelessWidget {
+  final Widget Function(BuildContext context, T state) child;
+  const WatchState(this.child, {super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Consumer<T>(builder: (BuildContext context, T value, Widget? child) => this.child(context, value));
+  }
+}