Zeus
91 lines
2.1 KiB
Dart
91 lines
2.1 KiB
Dart
import 'dart:math';
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import 'package:flutter/material.dart';
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///
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/// desc:
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///
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class WaterRipple extends StatefulWidget {
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final Color color;
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final Duration duration;
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final Curve curve;
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final int count;
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const WaterRipple(
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{Key? key,
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this.color = Colors.white,
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this.count = 3,
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this.duration = const Duration(milliseconds: 800),
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this.curve = Curves.linear})
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: super(key: key);
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@override
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_WaterRippleState createState() => _WaterRippleState();
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}
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class _WaterRippleState extends State<WaterRipple>
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with SingleTickerProviderStateMixin {
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late AnimationController _controller;
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late Animation _animation;
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@override
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void initState() {
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_controller = AnimationController(vsync: this, duration: widget.duration)
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..repeat();
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_animation = CurveTween(curve: widget.curve).animate(_controller);
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super.initState();
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}
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@override
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void dispose() {
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_controller.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return AnimatedBuilder(
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animation: _controller,
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builder: (context, child) {
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return CustomPaint(
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painter: WaterRipplePainter(_animation.value,
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count: widget.count, color: widget.color),
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);
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},
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);
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}
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}
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class WaterRipplePainter extends CustomPainter {
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final double progress;
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final int count;
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final Color color;
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Paint _paint = Paint()..style = PaintingStyle.fill;
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WaterRipplePainter(this.progress,
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{this.count = 3, this.color = const Color(0xFF0080ff)});
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@override
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void paint(Canvas canvas, Size size) {
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double radius = min(size.width / 2, size.height / 2);
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for (int i = count; i >= 0; i--) {
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final double opacity = (1.0 - ((i + progress) / (count + 1)));
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final Color _color = color.withOpacity(opacity);
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_paint..color = _color;
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double _radius = radius * ((i + progress) / (count + 1));
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canvas.drawCircle(
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Offset(size.width / 2, size.height / 2), _radius, _paint);
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}
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}
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@override
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bool shouldRepaint(covariant WaterRipplePainter old) {
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return progress != old.progress || color != old.color || count != old.count;
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}
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}
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