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| 1 | +/// |
| 2 | +/// Created by NieBin on 2019年6月10日 |
| 3 | +/// Github: https://github.com/nb312 |
| 4 | +/// Email: niebin312@gmail.com |
| 5 | +/// |
| 6 | +import "package:flutter/material.dart"; |
| 7 | +import 'package:flutter_widgets/const/_const.dart'; |
| 8 | + |
| 9 | +class AnimWidgetPage extends StatefulWidget { |
| 10 | + @override |
| 11 | + _AnimWidgetState createState() => _AnimWidgetState(); |
| 12 | +} |
| 13 | + |
| 14 | +class _AnimWidgetState extends State<AnimWidgetPage> |
| 15 | + with SingleTickerProviderStateMixin { |
| 16 | + Animation<double> _anim; |
| 17 | + AnimationController _controller; |
| 18 | + |
| 19 | + @override |
| 20 | + void initState() { |
| 21 | + _controller = |
| 22 | + AnimationController(vsync: this, duration: Duration(seconds: 2)); |
| 23 | + CurvedAnimation curve = |
| 24 | + CurvedAnimation(parent: _controller, curve: Curves.easeIn); |
| 25 | + _anim = Tween(begin: 0.0, end: 30.0).animate(curve); |
| 26 | + super.initState(); |
| 27 | + } |
| 28 | + |
| 29 | + Widget _animWidget() => _AnimWidget( |
| 30 | + anim: _anim, |
| 31 | + child: Text("This is Animation Widget."), |
| 32 | + ); |
| 33 | + |
| 34 | + @override |
| 35 | + Widget build(BuildContext context) { |
| 36 | + return Scaffold( |
| 37 | + appBar: AppBar( |
| 38 | + title: Text(PageName.ANIM_WIDGET), |
| 39 | + ), |
| 40 | + body: Column( |
| 41 | + children: <Widget>[ |
| 42 | + _animWidget(), |
| 43 | + FloatingActionButton( |
| 44 | + child: Text("Click me."), |
| 45 | + onPressed: () { |
| 46 | + _controller.reset(); |
| 47 | + _controller.forward(); |
| 48 | + }, |
| 49 | + ) |
| 50 | + ], |
| 51 | + ), |
| 52 | + ); |
| 53 | + } |
| 54 | +} |
| 55 | + |
| 56 | +class _AnimWidget extends AnimatedWidget { |
| 57 | + const _AnimWidget({Key key, Animation<double> anim, this.child}) |
| 58 | + : super(key: key, listenable: anim); |
| 59 | + |
| 60 | + Animation<double> get size => listenable; |
| 61 | + final Widget child; |
| 62 | + |
| 63 | + @override |
| 64 | + Widget build(BuildContext context) { |
| 65 | + return Container( |
| 66 | + constraints: BoxConstraints.expand( |
| 67 | + width: size.value * 10, |
| 68 | + height: size.value * 10, |
| 69 | + ), |
| 70 | + color: RED_LIGHT, |
| 71 | + child: child); |
| 72 | + } |
| 73 | +} |
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