flutter Dismissible 可以在拖动时隐藏的widget

import ‘package:flutter/material.dart‘;

class DismissedAppPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return new _DismissedAppPageState();
  }
}

class _DismissedAppPageState extends State<DismissedAppPage> {
  List<String> list = [
    ‘A‘,‘B‘,‘C‘,‘D‘,‘E‘,‘F‘,‘G‘,‘H‘,‘I‘,‘J‘,‘K‘,‘L‘
  ];


  @override
  Widget build(BuildContext context) {

    // TODO: implement build
    return new Scaffold(

      appBar: new AppBar(
        title: new Text(‘Dismissed 学习‘),centerTitle: true,),body: new ListView.builder(
          itemCount: list.length,itemBuilder: (context,index) {
            final String curItem = list[index];

            return new Dismissible(
                key: new Key(curItem),direction: DismissDirection.endToStart,onDismissed: (direction) {
                  list.removeAt(index);
                  print("$curItem 被划走了");
                  final snackBar = new SnackBar(content: new Text("$curItem"));
                  Scaffold.of(context).showSnackBar(snackBar);
                },background: new Container(
                    child: new Center(
                      child: new Text(‘即将被删除‘),color: Colors.red),child: new ListTile(
                  title: new Text(curItem),));
          }),);
  }
}

class DismissedPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return new Scaffold(
      body: new DismissedAppPage(),);
  }
}