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 rippleColor =
      (params['color'] as Color?) ?? const Color(0x44FFFFFF);
  final maxScale = (params['maxScale'] as double?) ?? 3.0;
  final fadeOut = (params['fadeOut'] as bool?) ?? true;

  return AnimatedBuilder(
    animation: animation,
    builder: (_, c) {
      final t = animation.value;
      final scale = 1.0 + t * (maxScale - 1.0);
      final opacity = fadeOut ? (1.0 - t).clamp(0.0, 1.0) : 1.0;
      return Stack(
        alignment: Alignment.center,
        children: [
          c!,
          IgnorePointer(
            child: Opacity(
              opacity: opacity,
              child: Transform.scale(
                scale: scale,
                child: DecoratedBox(
                  decoration: BoxDecoration(
                    shape: BoxShape.circle,
                    color: rippleColor,
                  ),
                  child: const SizedBox.expand(),
                ),
              ),
            ),
          ),
        ],
      );
    },
    child: child,
  );
}