createColorFilterAnimation method
Implementation
Animation<Color?>? createColorFilterAnimation() {
// ignore: unnecessary_null_comparison
if (richbar.backgroundOpaque == null) return null;
return ColorTween(
begin: Colors.transparent, end: richbar.blockInteractionColor)
.animate(
CurvedAnimation(
parent: _animationController!,
curve: const Interval(0.0, 0.35, curve: Curves.easeInOutCirc),
),
);
}