lazy_load_scrollview 0.0.2

  • README.md
  • CHANGELOG.md
  • Example
  • Installing
  • Versions
  • 87

Lazy load scrollview

A wrapper for a ScrollView that will enable lazy loading

Usage

Add lazy_load_scrollview dependency to your pubspec.yaml:

dependencies:
  lazy_load_scrollview: 0.0.1

In your Dart code, import package:lazy_load_scrollview/lazy_load_scrollview.dart Then you can wrap your ListView or GridView with the LazyLoadScrollView. Make sure you add an endOfPageListener which will receive the call when the bottom of the list has been reached.

import 'package:lazy_load_scrollview/lazy_load_scrollview.dart';


@override
Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: LazyLoadScrollView(
        endOfPageListener: () => loadMore(),
        child: ListView.builder(
          itemCount: data.length,
          itemBuilder: (context, position) {
            return Text("Position $position");
          },
        ),
      ),
    );
}

Class definition


LazyLoadScrollView(
  endOfPageListener: () => loadMore(), // The callback when reaching the end of the list
  scrollOffset: 100 // Pixels from the bottom that should trigger a callback 
  child: Widget, // A subclass of `ScrollView`
);

[0.0.1] - 29-07-2018

  • Initial release
  • Contains basic functionality

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:lazy_load_scrollview/lazy_load_scrollview.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Lazy Load Demo',
      home: new MyHomePage(title: 'Lazy Load Demo'),
    );
  }
}

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

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  List<int> data = [];
  int currentLength = 0;

  final int increment = 10;

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

  void _loadMore() {
    setState(() {
      for (var i = currentLength; i <= currentLength + increment; i++) {
        data.add(i);
      }
      currentLength = data.length;
    });
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text(widget.title),
      ),
      body: LazyLoadScrollView(
        onEndOfPage: () => _loadMore(),
        child: ListView.builder(
          itemCount: data.length,
          itemBuilder: (context, position) {
            return new DemoItem(position);
          },
        ),
      ),
    );
  }
}

class DemoItem extends StatelessWidget {
  final int position;

  const DemoItem(
    this.position, {
    Key key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(8.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: <Widget>[
            Row(
              crossAxisAlignment: CrossAxisAlignment.center,
              children: <Widget>[
                Container(
                  color: Colors.grey,
                  height: 40.0,
                  width: 40.0,
                ),
                SizedBox(width: 8.0),
                Text("Item $position"),
              ],
            ),
            Text(
                "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque sed vulputate orci. Proin id scelerisque velit. Fusce at ligula ligula. Donec fringilla sapien odio, et faucibus tortor finibus sed. Aenean rutrum ipsum in sagittis auctor. Pellentesque mattis luctus consequat. Sed eget sapien ut nibh rhoncus cursus. Donec eget nisl aliquam, ornare sapien sit amet, lacinia quam."),
          ],
        ),
      ),
    );
  }
}

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:


dependencies:
  lazy_load_scrollview: ^0.0.2

2. Install it

You can install packages from the command line:

with Flutter:


$ flutter packages get

Alternatively, your editor might support flutter packages get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:


import 'package:lazy_load_scrollview/lazy_load_scrollview.dart';
  
Version Uploaded Documentation Archive
0.0.2 Jul 30, 2018 Go to the documentation of lazy_load_scrollview 0.0.2 Download lazy_load_scrollview 0.0.2 archive
0.0.1 Jul 29, 2018 Go to the documentation of lazy_load_scrollview 0.0.1 Download lazy_load_scrollview 0.0.1 archive
Popularity:
Describes how popular the package is relative to other packages. [more]
78
Health:
Code health derived from static analysis. [more]
100
Maintenance:
Reflects how tidy and up-to-date the package is. [more]
90
Overall:
Weighted score of the above. [more]
87
Learn more about scoring.

We analyzed this package on Dec 5, 2018, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.1.0
  • pana: 0.12.7
  • Flutter: 1.0.0

Platforms

Detected platforms: Flutter

References Flutter, and has no conflicting libraries.

Maintenance suggestions

Package is pre-v0.1 release. (-10 points)

While there is nothing inherently wrong with versions of 0.0.*, it usually means that the author is still experimenting with the general direction of the API.

Dependencies

Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0-dev.1.2 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11
meta 1.1.6
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies
flutter_test