forked from lxm_flutter/FlutterUnit
89 lines
2.4 KiB
Dart
89 lines
2.4 KiB
Dart
import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020-03-23
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/// contact me by email 1981462002@qq.com
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/// 说明:
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// {
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// "widgetId": 122,
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// "name": 'AnimatedPositionedDirectional基本使用',
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// "priority": 1,
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// "subtitle":
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// "【child】 : 孩子组件 【Widget】\n"
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// "【duration】 : 动画时长 【Duration】\n"
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// "【onEnd】 : 动画结束回调 【Function()】\n"
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// "【curve】 : 动画曲线 【Duration】\n"
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// "【top】 : 到父顶距离 【double】\n"
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// "【end】 : 到父右距离 【double】\n"
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// "【start】 : 到父左距离 【double】\n"
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// "【bottom】 : 到父底距离 【double】",
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// }
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class CustomAnimatedPositionedDirectional extends StatefulWidget {
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const CustomAnimatedPositionedDirectional({Key? key}) : super(key: key);
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@override
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_CustomAnimatedPositionedDirectionalState createState() =>
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_CustomAnimatedPositionedDirectionalState();
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}
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class _CustomAnimatedPositionedDirectionalState
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extends State<CustomAnimatedPositionedDirectional> {
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final double startTop = 0.0;
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final double endTop = 30.0;
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double _top = 0.0;
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@override
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void initState() {
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_top = startTop;
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super.initState();
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}
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@override
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Widget build(BuildContext context) {
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return Column(
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children: <Widget>[
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_buildSwitch(),
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Container(
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color: Colors.grey.withAlpha(33),
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width: 200,
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height: 100,
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child: Stack(
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children: _buildChildren(),
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),
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),
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],
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);
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}
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List<Widget> _buildChildren() => <Widget>[
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AnimatedPositionedDirectional(
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duration: const Duration(seconds: 1),
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top: _top,
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start: _top * 4,
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child: const Icon(
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Icons.android,
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color: Colors.green,
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size: 50,
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),
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),
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AnimatedPositionedDirectional(
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duration: const Duration(seconds: 1),
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top: 50 - _top,
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start: 150 - _top * 4,
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child: const Icon(
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Icons.android,
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color: Colors.red,
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size: 50,
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),
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)
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];
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Widget _buildSwitch() => Switch(
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value: _top == endTop,
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onChanged: (v) {
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setState(() {
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_top = v ? endTop : startTop;
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});
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});
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}
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