forked from lxm_flutter/FlutterUnit
62 lines
1.9 KiB
Dart
62 lines
1.9 KiB
Dart
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import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020/9/21
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/// contact me by email 1981462002@qq.com
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/// 说明: 226 TweenAnimationBuilder 渐变动画构造器
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/// 通过渐变器 Tween 对相关属性进行渐变动画，通过 builder 进行局部构建，减少刷新范围。不需要自定义动画器，可指定动画时长、曲线、结束回调。
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///
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// {
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// "widgetId": 226,
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// "name": 'TweenAnimationBuilder 使用案例',
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// "priority": 1,
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// "subtitle":
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// "【tween】 : *渐变器 【Tween<T>】\n"
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// "【duration】 : *时长 【Duration】\n"
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// "【builder】 : *构造器 【ValueWidgetBuilder<T>】\n"
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// "【curve】 : 动画曲线 【Curve】\n"
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// "【onEnd】 : 结束回调 【VoidCallback】\n"
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// "【child】 : 子组件 【Widget】",
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// }
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class TweenAnimationBuilderDemo extends StatefulWidget {
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@override
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_TweenAnimationBuilderDemoState createState() =>
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_TweenAnimationBuilderDemoState();
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}
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class _TweenAnimationBuilderDemoState extends State<TweenAnimationBuilderDemo> {
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Color _value = Colors.red;
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@override
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Widget build(BuildContext context) {
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return TweenAnimationBuilder(
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tween: ColorTween(begin: Colors.blue, end: _value),
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duration: Duration(milliseconds: 800),
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builder: (BuildContext context, Color color, Widget child) {
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return GestureDetector(
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onTap: () {
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setState(() {
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_value = _value == Colors.red ? Colors.blue : Colors.red;
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});
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},
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child: Container(
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width: 40,
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height: 40,
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child: child,
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decoration: BoxDecoration(
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color: color,
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borderRadius: BorderRadius.circular(5)
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),
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),
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);
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},
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child: Icon(
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Icons.android_outlined,
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color: Colors.white,
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),
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);
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}
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}
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