Flutter Lazy ListView

A light-weight minimalist dart packackage for lazy loading of infinite lists.. (packed with some cool features) Uses dart streams and sliverlists under-the-hood.

Parameters

Controller This is the default DataFeedController of your data type. This is a required parameter

onRefresh Async function that needs to be run when a user pulls down on the list. If null; this will disable the pull from top animations.

noDataBuilder This can be used to build a widget or a placeholder when there is no data.

emptyListBuilder This can be used to build a widget or a placeholder when the list is empty.

errorBuilder This can be used to build a widget or a placeholder when there is a error in the list.

offSet The offset from the bottom where the onReachingend funtion to be called. default is 250.

onReachingEnd The async function which will be called when the user scrolls towards the end of the list. (depends on the offset as well)

itemBuilder The default item builder.refer the example

separatorBuilder The default separator builder. To use this you must use FlutterLazyListView<YourModel>.separated

padding Use this to override padding. Default is EdgeInsets.symmetric(horizontal: 10, vertical: 20)

Screenshot

Usage

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_lazy_listview/flutter_lazy_listview.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: FlutterLazyListViewExample(),
    );
  }
}

class FlutterLazyListViewExample extends StatefulWidget {
  @override
  _FlutterLazyListViewExampleState createState() =>
      _FlutterLazyListViewExampleState();
}

class _FlutterLazyListViewExampleState
    extends State<FlutterLazyListViewExample> {

//Data feed controller
  var _controller = DataFeedController<YourMode;>();

  //Async function which loads next data
  //
  //You can add your api calls etc.
  _addDummyMessages() async {
    List<YourModel> list = [];
   
   //append data to the controller
    await Future.delayed(Duration(seconds: 3), () {
      _controller.appendData(list);
    });
  }

  @override
  void initState() {
    super.initState();
    _addDummyMessages();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: Column(
          children: [
            Expanded(
              child: FlutterLazyListView<YourModel>(
                dataFeedController: _controller,
                offset: 250,
                onReachingEnd: () async {
			// async function which is called when scrolls to end
                  await _addDummyMessages();
                },
                itemBuilder: (BuildContext c, YourModel m, int d) {
                  return YourWidget();
                },
              ),
            ),
          ],
        ),
      ),
    );
  }
}

Authors

Yasas Wickramarathne