Dismiss flutter list / flutter sola çekerek silme işlemi

dismis.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("Ejemplo"),
        ),
        body: Center(child: SwipeList()));
  }
}

class SwipeList extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return ListItemWidget();
  }
}

class ListItemWidget extends State<SwipeList> {
  List items = getDummyList();

  @override
  Widget build(BuildContext context) {
    return Container(
        child: ListView.builder(
          itemCount: items.length,
          itemBuilder: (context, index) {
            return Dismissible(
              key: Key(items[index]),
              background: Container(
                alignment: AlignmentDirectional.centerEnd,
                color: Colors.red,
                child: Icon(
                  Icons.delete,
                  color: Colors.white,
                ),
              ),
              onDismissed: (direction) {
                setState(() {
                  items.removeAt(index);
                });
              },
              direction: DismissDirection.endToStart,
              child: Card(
                  margin: EdgeInsets.only(left: 10, right: 10, top: 12),
                  elevation: 8,
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(12.0),
                  ),
                  semanticContainer: true,
                  clipBehavior: Clip.antiAliasWithSaveLayer,
                  child: Container(
                    height: 135,
                    child: Stack(children: <Widget>[
                      Positioned(
                          top: 0,
                          left: 0,
                          right: 0,
                          child: Container(
                              color: Colors.white,
                              child: Column(
                                children: <Widget>[
                                  Image.network(
                                    'https://placeimg.com/640/480/any',
                                    fit: BoxFit.fitHeight,
                                  ),
                                ],
                              ))),
                      Positioned(
                          top: 20,
                          left: 0,
                          right: 0,
                          child: Container(
                            child: Column(
                              children: <Widget>[
                                Text(items[index],
                                    style: TextStyle(
                                        fontWeight: FontWeight.bold,
                                        fontSize: 25,
                                        color: Colors.white),
                                    textAlign: TextAlign.center),
                              ],
                            ),
                          )),
                    ]),
                  )),
            );
          },
        ));
  }

  static List getDummyList() {
    List list = List.generate(5, (i) {
      return "Item ${i + 1}";
    });
    print(list);
    return list;
  }
}