ensure new value applied.

lib/ring_indicator.dart

@@ -106,23 +106,26 @@ class _RingIndicatorState extends State<RingIndicator> {
     ticker = Ticker((_) {
       var diff = DateTime.now().difference(startTime).inMilliseconds;
       if (diff > 300) {
+        _applyChangeToSelfAndParent(newValue);
         return ticker?.stop();
       }
-      if (mounted) {
+      _applyChangeToSelfAndParent(oldValue + (newValue - oldValue) * (diff / 300));
-        setState(() {
-          _value = oldValue + (newValue - oldValue) * (diff / 300);
-          values[0] = LevelValue(_value);
-        });
-        if (parent != null) {
-          for (var value in values.values) {
-            parent!.updateValue(value.incrementLevel());
-          }
-        }
-      }
     })
       ..start();
   }
 
+  _applyChangeToSelfAndParent(double value) {
+    setState(() {
+      _value = value;
+      values[0] = LevelValue(_value);
+    });
+    if (parent != null) {
+      for (var value in values.values) {
+        parent!.updateValue(value.incrementLevel());
+      }
+    }
+  }
+
   @override
   void initState() {
     super.initState();