extended_list 3.0.0-non-null-safety

extended list support track collect garbage/viewport indexes, build lastChild as special child and enable to layout close to trailing.

example/lib/main.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'example_route.dart';
import 'example_route_helper.dart';
import 'example_routes.dart';

///
///  create by zmtzawqlp on 2019/11/23
///

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'ExtendedList Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      initialRoute: Routes.fluttercandiesMainpage,
      onGenerateRoute: (RouteSettings settings) {
        //when refresh web, route will as following
        //   /
        //   /fluttercandies:
        //   /fluttercandies:/
        //   /fluttercandies://mainpage
        if (kIsWeb && settings.name.startsWith('/')) {
          return onGenerateRouteHelper(
            settings.copyWith(name: settings.name.replaceFirst('/', '')),
            notFoundFallback:
                getRouteResult(name: Routes.fluttercandiesMainpage).widget,
          );
        }
        return onGenerateRouteHelper(settings);
      },
    );
  }
}