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Created
May 15, 2023 15:23
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Animated discs example
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import 'dart:math'; | |
import 'package:flutter/material.dart'; | |
class DiscData { | |
static final _rng = Random(); | |
final double size; | |
final Color color; | |
final Alignment alignment; | |
DiscData() | |
: size = _rng.nextDouble() * 40 + 10, | |
color = Color.fromARGB( | |
_rng.nextInt(200), | |
_rng.nextInt(255), | |
_rng.nextInt(255), | |
_rng.nextInt(255), | |
), | |
alignment = Alignment( | |
_rng.nextDouble() * 2 - 1, | |
_rng.nextDouble() * 2 - 1, | |
); | |
} | |
void main() async { | |
runApp( | |
MaterialApp( | |
debugShowCheckedModeBanner: false, | |
home: Scaffold( | |
body: Container( | |
color: const Color(0xFF15202D), | |
child: const SizedBox.expand( | |
child: VariousDiscs(50), | |
), | |
), | |
), | |
), | |
); | |
} | |
class VariousDiscs extends StatefulWidget { | |
final int numberOfDiscs; | |
const VariousDiscs(this.numberOfDiscs); | |
@override | |
State<VariousDiscs> createState() => _VariousDiscsState(); | |
} | |
class _VariousDiscsState extends State<VariousDiscs> { | |
final _discs = <DiscData>[]; | |
@override | |
void initState() { | |
super.initState(); | |
_makeDiscs(); | |
} | |
void _makeDiscs() { | |
_discs.clear(); | |
for (int i = 0; i < widget.numberOfDiscs; i++) { | |
_discs.add(DiscData()); | |
} | |
} | |
@override | |
Widget build(BuildContext context) { | |
return Stack( | |
children: [ | |
const Center( | |
child: Text( | |
'Click a disc!', | |
style: TextStyle(color: Colors.white, fontSize: 50), | |
), | |
), | |
GestureDetector( | |
onTap: () => setState(() { | |
_makeDiscs(); | |
}), | |
child: Stack(children: [ | |
for (final disc in _discs) | |
Positioned.fill( | |
child: AnimatedAlign( | |
duration: const Duration(milliseconds: 500), | |
curve: Curves.easeInOut, | |
alignment: disc.alignment, | |
child: AnimatedContainer( | |
duration: const Duration(milliseconds: 500), | |
decoration: BoxDecoration( | |
color: disc.color, | |
shape: BoxShape.circle, | |
), | |
height: disc.size, | |
width: disc.size, | |
), | |
), | |
), | |
]), | |
), | |
], | |
); | |
} | |
} |
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