Add files via upload

Author: While1true

lib/Progress.dart

@@ -0,0 +1,104 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
+
+class MyProgress extends StatefulWidget {
+ final Size size;
+ final Color color;
+ final int count;
+ final int milliseconds;
+
+ const MyProgress({@required this.size, this.milliseconds: 300, this.color: Colors
+ .green, this.count: 4});
+
+ @override
+ State<StatefulWidget> createState() => _ProgressState();
+
+}
+
+class _ProgressState extends State<MyProgress> with TickerProviderStateMixin {
+
+ List<Animation<double>>animators = [];
+ List<AnimationController>_animationControllers = [];
+
+ @override
+ void initState() {
+ super.initState();
+ for (int i = 0; i < widget.count; i++) {
+
+ var animationController = new AnimationController(vsync: this,
+ duration: Duration(milliseconds: widget.milliseconds * widget.count));
+ animationController.value=0.8*i/widget.count;
+ _animationControllers.add(animationController);
+ Animation<double> animation = new Tween(begin: 0.1, end: 1.9).animate(
+ animationController);
+ animators.add(animation);
+ }
+ animators[0].addListener(_change);
+ try {
+ var mi = (widget.milliseconds~/(2*animators.length-2));
+ for (int i = 0; i < animators.length; i++) {
+ print(( mi*i).toString());
+ dodelay(_animationControllers[i], mi*i);
+ }
+ } on Exception {
+
+ }
+ }
+
+ void dodelay(AnimationController _animationControllers,
+ int delay) async{
+ Future.delayed(Duration(milliseconds: delay),(){
+ _animationControllers..repeat().orCancel;
+ });
+ }
+
+ void _change() {
+ setState(() {});
+ }
+
+ @override
+ Widget build(BuildContext context) {
+ return new CustomPaint(painter: _Progress(
+ animators: animators, color: widget.color, count: widget.count),
+ size: widget.size,);
+ }
+
+ @override
+ void dispose() {
+ super.dispose();
+ animators[0].removeListener(_change);
+ for (AnimationController _animationController in _animationControllers) {
+ _animationController.dispose();
+ }
+ }
+}
+
+class _Progress extends CustomPainter {
+ final Color color;
+ final int count;
+ final List<Animation<double>>animators;
+
+ const _Progress({this.animators, this.color, this.count});
+
+ @override
+ void paint(Canvas canvas, Size size) {
+ var radius = size.width / (3 * count + 1);
+ var paint = new Paint()
+ ..color = color
+ ..style = PaintingStyle.fill;
+ for (int i = 1; i < count + 1; i++) {
+ double value = animators[i - 1].value;
+ canvas.drawCircle(
+ new Offset(radius * i * 3 - radius, size.height / 2),
+ radius * (value > 1 ? (2 - value) : value), paint);
+ }
+ }
+
+ @override
+ bool shouldRepaint(CustomPainter oldDelegate) {
+ return oldDelegate != this;
+ }
+
+}