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