41 lines
1.1 KiB
Dart
41 lines
1.1 KiB
Dart
import 'package:flutter/material.dart';
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class CullOpacityPage extends StatefulWidget {
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@override
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State<StatefulWidget> createState() => _CullOpacityPageState();
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}
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class _CullOpacityPageState extends State<CullOpacityPage> with SingleTickerProviderStateMixin {
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Animation<double> _offsetY;
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AnimationController _controller;
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@override
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void initState() {
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super.initState();
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_controller = AnimationController(vsync: this, duration: const Duration(seconds: 2));
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_offsetY = Tween<double>(begin: 0, end: -1000.0).animate(_controller)..addListener((){
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setState(() {});
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});
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_controller.repeat();
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}
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@override
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Widget build(BuildContext context) {
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return Stack(children: List<Widget>.generate(50, (int i) => Positioned(
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left: 0,
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top: (200 * i).toDouble() + _offsetY.value,
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child: Opacity(
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opacity: 0.5,
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child: RepaintBoundary(
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child: Container(
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// Slightly change width to invalidate raster cache.
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width: 1000 - (_offsetY.value / 100),
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height: 100, color: Colors.red,
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),
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),
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),
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)));
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}
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}
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