128 lines
3.6 KiB
Dart
128 lines
3.6 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:flutter/scheduler.dart';
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import 'dart:async';
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void main() => runApp(MyApp());
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class MyApp extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return MaterialApp(home: Scaffold(body: App()));
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}
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}
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class App extends StatefulWidget {
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@override
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AppState createState() => AppState();
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}
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class AppState extends State<App> with SingleTickerProviderStateMixin {
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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(
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duration: Duration(seconds: 3),
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vsync: this,
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);
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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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Future _startAnim() async {
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try {
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await _controller.forward().orCancel;
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await _controller.reverse().orCancel;
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} on TickerCanceled {
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print('welp we fucked');
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}
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}
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@override
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Widget build(BuildContext context) {
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return Material(
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child: GestureDetector(
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onTap: () {
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_startAnim();
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},
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child: Stack(
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fit: StackFit.expand,
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children: [
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Image.network(
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'https://wallpaperplay.com/walls/full/e/5/3/13586.jpg',
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fit: BoxFit.cover,
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),
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ColorFiltered(
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colorFilter: ColorFilter.mode(Colors.black.withOpacity(0.8),
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BlendMode.srcOut), // This one will create the magic
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child: Stack(
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fit: StackFit.expand,
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children: [
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Container(
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decoration: BoxDecoration(
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color: Colors.black,
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backgroundBlendMode: BlendMode
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.dstOut), // This one will handle background + difference out
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),
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MovingHole(controller: _controller)
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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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}
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}
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class MovingHole extends StatelessWidget {
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MovingHole({Key key, this.controller})
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: width = Tween<double>(begin: 50.0, end: 150.0).animate(CurvedAnimation(
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parent: controller,
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curve: Interval(0.0, 1, curve: Curves.fastOutSlowIn))),
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height = Tween<double>(begin: 50.0, end: 150.0).animate(CurvedAnimation(
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parent: controller,
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curve: Interval(0.0, 1, curve: Curves.fastOutSlowIn))),
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radius = BorderRadiusTween(
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begin: BorderRadius.circular(0.0),
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end: BorderRadius.circular(100.0))
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.animate(CurvedAnimation(
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parent: controller,
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curve: Interval(
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0.0,
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1,
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curve: Curves.ease,
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))),
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alignment = AlignmentTween(
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begin: Alignment.bottomCenter, end: Alignment.topCenter)
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.animate(CurvedAnimation(
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parent: controller,
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curve: Interval(0.0, 1, curve: Curves.ease))),
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super(key: key);
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Animation<double> controller;
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Animation<double> width;
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Animation<double> height;
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Animation<BorderRadius> radius;
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Animation<Alignment> alignment;
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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: (BuildContext context, Widget child) {
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return Container(
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alignment: alignment.value,
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child: Container(
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width: width.value,
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height: height.value,
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decoration: BoxDecoration(
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color: Colors.red, borderRadius: radius.value),
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));
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});
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}
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}
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