AnimatedPadding 边距动画

能让子组件进行Padding(内边距)动画，可指定时长和曲线，有动画结束事件。

相关组件

Padding

AnimatedPadding基本使用

   <br />【child】 : 孩子组件   【Widget】<br />【duration】 : 动画时长   【Duration】<br />【onEnd】 : 动画结束回调   【Function()】<br />【curve】 : 动画曲线   【Duration】<br />【padding】 : 内边距   【EdgeInsetsGeometry】<br />![144.gif](https://cdn.nlark.com/yuque/0/2020/gif/326147/1589457629640-d5cda01e-2e00-4d22-9577-8266e201095c.gif#align=left&display=inline&height=314&margin=%5Bobject%20Object%5D&name=144.gif&originHeight=314&originWidth=502&size=184656&status=done&style=none&width=502)

import 'package:flutter/material.dart';
class CustomAnimatedPadding extends StatefulWidget {
  @override
  _CustomAnimatedPaddingState createState() => _CustomAnimatedPaddingState();
}

class _CustomAnimatedPaddingState extends State<CustomAnimatedPadding> {
  final EdgeInsets startPadding = EdgeInsets.all(10);
  final EdgeInsets endPadding = EdgeInsets.all(30);

  EdgeInsets _padding;

  @override
  void initState() {
    _padding = startPadding;
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        Switch(
            value: _padding == endPadding,
            onChanged: (v) {
              setState(() {
                _padding = v ? endPadding : startPadding;
              });
            }),
        Container(
          color: Colors.grey.withAlpha(22),
          width: 200,
          height: 100,
          child: AnimatedPadding(
            duration: Duration(seconds: 1),
            curve: Curves.fastOutSlowIn,
            padding: _padding,
            onEnd: () => print('End'),
            child: Container(
              alignment: Alignment.center,
              color: Colors.blue,
              child: Text(
                '张风捷特烈',
                style: TextStyle(color: Colors.white),
              ),
            ),
          ),
        ),
      ],
    );
  }
}