Merge pull request matthewfx#32 from nero-angela/nero

Modify to excute _setupPainter when appearance has changed

Author: matthewfx

lib/src/circular_slider.dart

@@ -61,6 +61,7 @@ class _SleekCircularSliderState extends State<SleekCircularSlider>
   double? _rotation;
   SpinAnimationManager? _spinManager;
   ValueChangedAnimationManager? _animationManager;
+  late int _appearanceHashCode;
 
   bool get _interactionEnabled => (widget.onChangeEnd != null ||
       widget.onChange != null && !widget.appearance.spinnerMode);
@@ -70,6 +71,7 @@ class _SleekCircularSliderState extends State<SleekCircularSlider>
     super.initState();
     _startAngle = widget.appearance.startAngle;
     _angleRange = widget.appearance.angleRange;
+    _appearanceHashCode = widget.appearance.hashCode;
 
     if (!widget.appearance.animationEnabled) {
       return;
@@ -138,8 +140,9 @@ class _SleekCircularSliderState extends State<SleekCircularSlider>
 
   @override
   Widget build(BuildContext context) {
-    /// If painter is null there is a need to setup it to prevent exceptions.
-    if (_painter == null) {
+    /// _setupPainter excution when _painter is null or appearance has changed.
+    if (_painter == null || _appearanceHashCode != widget.appearance.hashCode) {
+      _appearanceHashCode = widget.appearance.hashCode;
       _setupPainter();
     }
     return RawGestureDetector(