sample_pagginate.dart

// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final List dataList = [];
  List currentDataList = [];
  int page = 1;
  int pageCount = 5;
  int startAt = 0;
  int endAt;
  int totalPages = 0;

  @override
  void initState() {
    for (var i = 1; i <= 100; i++) dataList.add("Test - $i");

    endAt = startAt + pageCount;
    totalPages = (dataList.length / pageCount).floor();
    if (dataList.length / pageCount > totalPages) {
      totalPages = totalPages + 1;
    }

    currentDataList = dataList.getRange(startAt, endAt).toList();
    super.initState();
  }

  void loadPreviousPage() {
    if (page > 1) {
      setState(() {
        startAt = startAt - pageCount;
        endAt = page == totalPages
            ? endAt - currentDataList.length
            : endAt - pageCount;
        currentDataList = dataList.getRange(startAt, endAt).toList();
        page = page - 1;
      });
    }
  }

  void loadNextPage() {
    if (page < totalPages) {
      setState(() {
        startAt = startAt + pageCount;
        endAt = dataList.length > endAt + pageCount
            ? endAt + pageCount
            : dataList.length;
        currentDataList = dataList.getRange(startAt, endAt).toList();
        page = page + 1;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Pagination'),
      ),
      body: Column(
        children: <Widget>[
          Expanded(
            child: ListView.builder(
              shrinkWrap: true,
              scrollDirection: Axis.vertical,
              itemCount: currentDataList.length,
              itemBuilder: (context, index) {
                return Card(
                  elevation: 5,
                  child: Text(
                    currentDataList[index],
                  ),
                );
              },
            ),
          ),
          
         ElevatedButton(
           child: Text("Change"),
         onPressed: (){
           dataList.replaceRange(startAt,endAt,["hallo1","hallo2","hallo3","hallo4","hallo5"]);
            currentDataList.replaceRange((currentDataList.length - currentDataList.length),currentDataList.length,["hallo1","hallo2","hallo3","hallo4","hallo5"]);
           setState((){});
         },
         ),
          Row(
            mainAxisAlignment: MainAxisAlignment.end,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: <Widget>[
              IconButton(
                onPressed: page > 1 ? loadPreviousPage : null,
                icon: Icon(
                  Icons.arrow_back_ios,
                  size: 35,
                ),
              ),
              Text("$page / $totalPages"),
              IconButton(
                onPressed: page < totalPages ? loadNextPage : null,
                icon: Icon(
                  Icons.arrow_forward_ios,
                  size: 35,
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }
}