build method Null safety
- dynamic context
Implementation
@override
Widget build(BuildContext context) {
return AnimatedBuilder(
animation: _animationController,
builder: (BuildContext context, Widget? child) {
return Center(
child: CustomPaint(
size: widget.boxSize,
painter: _Painter(
lineLength: widget.lineLength,
lineOpacity: _animationController.value,
),
),
);
},
);
}