Flutter：AnimatedPadding动态修改padding

// 默认top为10，点击后修改为100，此时方块会向下移动
padding: EdgeInsets.fromLTRB(left, top, right, bottom),

class _MyHomePageState extends State<MyHomePage> {
  bool flag = true;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('标题'),
      ),
      body: AnimatedPadding(
        curve: Curves.easeIn, // 动画属性
        duration: Duration(milliseconds: 500),
        // 默认
        padding: EdgeInsets.fromLTRB(10, flag ?10 : 100, 0, 0),
        child: Container(
          width: 100,
          height: 100,
          color: Colors.red,
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: (){
          flag = !flag;
          setState(() {});
        },
        child: const Icon(Icons.add),
      ),
    );
  }
}