mattermost / react-native-recyclerview-list

A RecyclerView implementation for React Native

react-native-recyclerview-list

A RecyclerView implementation for ReactNative, that overcomes some limitations of FlatList, VirtualizedList and ListView.

Supported React Native Versions

Component Version	RN Versions
0.1.x	0.45, 0.46
0.2.0 - 0.2.2	0.47, 0.48
0.2.3 - 0.3.5	0.49, 0.56
0.4.0 - latest	>= 0.57

Features

• Supports native animation during adding or removal of items (as the classic RecyclerView does)
• Add items at the top with no scrolling issue: it means that you can easily implement an infinite scroll in both directions
• Scroll to whatever index you want: even if you don't know the exact dimensions of your rendered items, you can scroll to any index without any scrolling issue
• Control the scrolling velocity: the velocity param in the scrollToIndex method is exactly for this
• Initial scroll index: specify the scroll position at startup, and there will be no flicker
• Low memory usage: it renders just the visible items plus some extra items around
• Supports both scroll direction: use the inverted prop to invert the scroll direction

Caveats

• It's just for Android.
• Just vertical linear layout. No fancy layouts as grid.

Getting started

# Install
yarn add react-native-recyclerview-list

# Mostly Automatic linking. (other linking methods listed below)
react-native link react-native-recyclerview-list

Manual installation

Android

1. Open up android/app/src/main/java/[...]/MainActivity.java

• Add import com.github.godness84.RNRecyclerViewList.RNRecyclerviewListPackage; to the imports at the top of the file
• Add new RNRecyclerviewListPackage() to the list returned by the getPackages() method

2. Append the following lines to android/settings.gradle:

   include ':react-native-recyclerview-list'
   project(':react-native-recyclerview-list').projectDir = new File(rootProject.projectDir, 	'../node_modules/react-native-recyclerview-list/android')
   

3. Insert the following lines inside the dependencies block in android/app/build.gradle:

     compile project(':react-native-recyclerview-list')
   

Usage

import RecyclerviewList, { DataSource } from 'react-native-recyclerview-list';

// Take an array as data
var rawdata = [
  { id: 1, text: 'Item #1' },
  { id: 2, text: 'Item #2' },
  { id: 3, text: 'Item #3' },
  { id: 4, text: 'Item #4' },
  { id: 5, text: 'Item #5' }
];

// Wrap your data in a DataSource.
// The second argument is the 'keyExtractor' function that returns the unique key of the item.
var dataSource = new DataSource(rawdata, (item, index) => item.id);

...

// Render the list
render() {
  return (
    <RecyclerviewList
      style={{ flex: 1 }}
      dataSource={dataSource}
      renderItem={({item, index}) => (
        <Text>{item.text} - {index}</Text>
      )} />
  );
}

Props

Prop name	Description	Type	Default value
style	Style for the list	object	{}
dataSource	The datasource that contains the data to render	DataSource	none
windowSize	Number of items to render at the top (and bottom) of the visible items	int	30
initialListSize	Number of items to render at startup.	int	10
initialScrollIndex	Index of the item to scroll at startup	int	none
initialScrollOffset	Offset of the scroll position at startup	int	none
inverted	Reverses the scrolling direction; the first model from the data source is rendered at the bottom	boolean	false
itemAnimatorEnabled	Whether animates items when they are added or removed	boolean	true
ListHeaderComponent	Component to render as header	component	none
ListFooterComponent	Component to render as footer	component	none
ListEmptyComponent	Component to render in case of no items	component	none
ItemSeparatorComponent	Component to render as item separator	component	none
onVisibleItemsChange	Called when the first and last index of the visible items change	function	none
onScroll	Called when the list is scrolling	function	none
onScrollBeginDrag	Called when the user starts scrolling	function	none
onScrollEndDrag	Called when the user stops dragging	function	none

Methods

Method name	Params	Description
scrollToIndex	{ index, animated, velocity, viewPosition, viewOffset }	Scroll the list to the indexed item such that it is positioned in the viewable area such that viewPosition 0 places it at the top, 1 at the bottom, and 0.5 centered in the middle. viewOffset is a fixed number of pixels to offset the final target position. It can be animated. velocity is the amount of milliseconds per inch.
scrollToEnd	{ animated, velocity }	Scroll to the end of the list. It can be animated. velocity is the amount of milliseconds per inch.

DataSource

It wraps your array, giving you some useful methods to update the data.

Methods

Method name	Params	Description
push	item	Add an item to the end of the array
unshift	item	Add an item to the beginning of the array
splice	index, deleteCount, ...items	Equals to Array.prototype.splice
set	index, item	Set the item at the specified index
get	index	Returns the item at the specified index
size		Returns the length of the array
setDirty		Forces the RecyclerViewList to render again the visible items
moveUp	index	Move the item up of 1 position
moveDown	index	Move the item down of 1 position

How to contribute to this library

Directory structure

.
├── example
│   ├── __tests__
│   ├── android
│   ├── ios
│   ├── app.json
│   ├── index.android.js
│   ├── index.ios.js
│   └── package.json
├── android
│   └── src
│      └── main
│          └── java
│              └── com
│                  └── github
│                      └── godness84
│                          └── RNRecyclerViewList
│                              ├── ContentSizeChangeEvent.java
│                              ├── RNRecyclerviewListModule.java
│                              ├── RNRecyclerviewListPackage.java
│                              ├── RecyclerViewBackedScrollView.java
│                              ├── RecyclerViewBackedScrollViewManager.java
│                              ├── RecyclerViewItemView.java
│                              ├── RecyclerViewItemViewManager.java
│                              └── VisibleItemsChangeEvent.java
├── src
│   ├── DataSource.js
│   └── RecyclerViewList.js
├── index.js
├── package.json
├── LICENSE.md
└── README.md

If you have to change Android native code, you must have a look at the code in library/android/src/main/java/com/github/godness84/RNRecyclerViewList. Depending of your changes you might have to change the Javascript interface as well in library/src/.

Run the example app

Make sure to have an emulator running or an Android device connected, and then:

$ cd example/
$ yarn install
$ react-native run-android

This will build the Android library (via gradle) and example app, then launch the main example activity on your connected device and run the Metro bundler at the same time.