build method

@override Widget build({ required Animation<double> animation, required Widget child, Map<String, Object?> params = const {}, })

Builds the animated widget for the forward direction.

animation — 0.0 → 1.0 where 0.0 = invisible/start, 1.0 = visible/end. child — the widget being animated. params — optional configuration map (typed by each plugin).

Concrete subclasses must override this method.

Implementation

@override
Widget build({
  required Animation<double> animation,
  required Widget child,
  Map<String, Object?> params = const {},
}) {
  final maxSigma = (params['sigma'] as double?) ?? 12.0;
  return AnimatedBuilder(
    animation: animation,
    builder: (_, c) {
      final sigma = maxSigma * (1.0 - animation.value);
      if (sigma < 0.01) return c!;
      return ImageFiltered(
        imageFilter: ImageFilter.blur(
          sigmaX: sigma,
          sigmaY: sigma,
          tileMode: TileMode.decal,
        ),
        child: c,
      );
    },
    child: child,
  );
}