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a guest Jul 17th, 2019 60 Never
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  1. import 'package:flutter/material.dart';
  2. import 'dart:math' as math;
  3.  
  4. class AnimatedBackground extends StatefulWidget {
  5.  
  6.     AnimatedBackground({Key key, this.controller}) : super(key: key);
  7.  
  8.     final ScrollController controller;
  9.  
  10.     @override
  11.     _AnimatedBackgroundState createState() => _AnimatedBackgroundState();
  12. }
  13.  
  14. class _AnimatedBackgroundState extends State<AnimatedBackground> {
  15.  
  16.     get offset => widget.controller.hasClients ? widget.controller.offset : 0;
  17.  
  18.     @override
  19.     Widget build(BuildContext context) {
  20.    
  21.         return AnimatedBuilder(
  22.  
  23.             animation: widget.controller,
  24.             builder: (BuildContext context, Widget child) {
  25.  
  26.                 return  OverflowBox(
  27.                    
  28.                     maxWidth: double.infinity,
  29.                     alignment: Alignment(4, 3),
  30.                     child: Transform.rotate(
  31.                         angle: ((math.pi * offset) / -1024),
  32.                         child: Icon(Icons.settings, size: 512, color: Colors.white)
  33.                     )
  34.                 );
  35.             }
  36.         );
  37.     }
  38. }
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