react-native-simple-recyclerlistview

react-native-simple-recyclerlistview

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This is a high performance listview for React Native and Web with support for complex layouts. JS only with no native dependencies, inspired by both RecyclerView on Android and UICollectionView on iOS.

npm install --save react-native-simple-recyclerlistview

• Overview and features
• Why?
• Demo
• Props
• Typescript
• Guides
• License
• Contact us

Note: Documentation will be upgraded soon, for now check code comments for clarity and exploring features. This component is actively tested with React Native Web as well.

Overview and features

RecyclerListView uses "cell recycling" to reuse views that are no longer visible to render items instead of creating new view objects. Creation of objects is very expensive and comes with a memory overhead which means as you scroll through the list the memory footprint keeps going up. Releasing invisible items off memory is another technique but that leads to creation of even more objects and lot of garbage collections. Recycling is the best way to render infinite lists that does not compromise performance or memory efficiency.

Apart from all performance benefits RecyclerListView comes with great features out of the box:

• Cross Platform, works on Web
• Supports staggered grid layouts
• Supports variable height items even if dimensions cannot be predetermined (prop - forceNonDeterministicRendering)
• Instant layout switching like going from GridView to ListView and vice versa
• End reach detections
• Horizontal Mode
• Viewability Events
• Initial render offset/index support
• Footer support
• Reflow support on container size change with first visible item preservation
• Scroll position preservation
• Window scrolling support for web
• (New) ItemAnimator interface added, customize to your will how RLV handles layout changes. Allows you to modify animations that move cells. You can do things like smoothly move an item to a new position when height of one of the cells has changed.
• (New) Stable Id support, ability to associate a stable id with an item. Will enable beautiful add/remove animations and optimize re-renders when DataProvider is updated.
• (New) Sticky recycler items that stick to either the top or bottom.

Why?

RecyclerListView was built with performance in mind which means no blanks while quick scrolls or frame drops. RecyclerListView encourages you to have deterministic heights for items you need to render. This does not mean that you need to have all items of same height and stuff, all you need is a way to look at the data and compute height upfront so that RecyclerListView can compute layout in one pass rather than waiting for the draw to happen. You can still do all sorts of GridViews and ListViews with different types of items which are all recycled in optimal ways. Type based recycling is very easy to do and comes out of the box.

In case you cannot determine heights of items in advance just set forceNonDeterministicRendering prop to true on RecyclerListView. Now, it will treat given dimensions as estimates and let items resize. Try to give good estimates to improve experience.

Demo

Production Flipkart Grocery Demo Video (or try the app): https://youtu.be/6YqEqP3MmoU
Infinite Loading/View Change (Expo): https://snack.expo.io/@naqvitalha/rlv-demo
Mixed ViewTypes: https://snack.expo.io/B1GYad52b
extendedState,stableIDs and ItemAnimator (Expo): https://snack.expo.io/@arunreddy10/19bb8e
Sample project: https://github.com/naqvitalha/travelMate
Web Sample (Using RNW): https://codesandbox.io/s/k54j2zx977, https://jolly-engelbart-8ff0d0.netlify.com/
Context Preservation Sample: https://github.com/naqvitalha/recyclerlistview-context-preservation-demo

Other Video: https://www.youtube.com/watch?v=Tnv4HMmPgMc

Props

Here's the updated README table with the additional props:

Props

Prop	Required	Params Type	Description
width	Yes	number	The width of the RecyclerListView.
height	Yes	number	The height of the RecyclerListView.
canChangeSize	No	boolean	Specify if the size of list items can change.
rowRenderer	Yes	(type: string | number, data: any, index: number, extendedState?: object | undefined) => JSX.Element	Method that returns a React component to be rendered. You get the type, data, index, and extendedState in the callback.
renderFooter	No	() => JSX.Element	Method to render a footer for the list. Useful for showing a loader while doing incremental loads.
externalScrollView	No	{ new (props: ScrollViewDefaultProps): BaseScrollView }	Use this to pass your own implementation of BaseScrollView.
forceNonDeterministicRendering	No	boolean	If enabled, dimensions provided in the layout provider will not be strictly enforced. Use this if item dimensions cannot be accurately determined.
horizontal	No	boolean	If true, the list will operate horizontally rather than vertically.
onScroll	No	(event: any) => void	Callback function executed when the user scrolls.
activityColor	No	ColorValue | undefined	The color for the loading activity indicator.
activitySize	No	number	'small'
emptyText	Yes	string	Text to display when the list is empty.
emptyTextStyle	Yes	TextStyle	Style for the empty text.
scrollViewProps	No	object	Additional props to be passed to the inner/external scrollview.
onEndReached	No	any	Callback function executed when the end of the view is reached.
onItemLayout	No	any	A callback function that is executed when an item of the RecyclerListView (at an index) has been layout. This can also be used as a proxy to itemsRendered kind of callbacks.

For full feature set have a look at prop definitions of RecyclerListView (bottom of the file). All ScrollView features like RefreshControl also work out of the box.

applyWindowCorrection usage

applyWindowCorrection is used to alter the visible window bounds of the RecyclerListView dynamically. The windowCorrection of RecyclerListView along with the current scroll offset are exposed to the user. The windowCorrection object consists of 3 numeric values:

• windowShift - Direct replacement of distanceFromWindow parameter. Window shift is the offset value by which the RecyclerListView as a whole is displaced within the StickyContainer, use this param to specify how far away the first list item is from window top. This value corrects the scroll offsets for StickyObjects as well as RecyclerListView.
• startCorrection - startCorrection is used to specify the shift in the top visible window bound, with which user can receive the correct Sticky header instance even when an external factor like CoordinatorLayout toolbar.
• endCorrection - endCorrection is used to specify the shift in the bottom visible window bound, with which user can receive correct Sticky Footer instance when an external factor like bottom app bar is changing the visible view bound.

As seen in the example below

Typescript

Typescript works out of the box. The only execption is with the inherited Scrollview props. In order for Typescript to work with inherited Scrollview props, you must place said inherited Scrollview props within the scrollViewProps prop.

import * as React from 'react';

import { StyleSheet, Dimensions, SafeAreaView, Alert } from 'react-native';
import {
  DataProvider,
  SimpleRecycler,
} from 'react-native-simple-recyclerlistview';
import SingleItem from './SingleItem';
import { Data } from './Data';

const dimensions = Dimensions.get('window');
export default function App() {
  const recyclerRef = React.useRef < SimpleRecycler > null;

  React.useEffect(() => {
    loadData();
  }, []);

  const loadData = () => {
    recyclerRef.current?.loadDataFromApi(Data);
  };

  const updateSelection = React.useCallback((index: number) => {
    const dataList = recyclerRef?.current?.state.dataList;
    const oldData: any = Object.assign([], dataList);
    oldData[index].item.isSelected = !oldData[index].item.isSelected;
    recyclerRef?.current?.setState({
      dataList: oldData,
      list: new DataProvider((r1, r2) => r1 !== r2).cloneWithRows(
        recyclerRef?.current?.state.dataList
      ),
    });
  }, []);

  const deleteItem = React.useCallback((index: number) => {
    Alert.alert('Delete', 'Do you want to Delete ', [
      {
        text: 'Cancel',
        style: 'cancel',
      },
      {
        text: 'OK',
        onPress: () => {
          recyclerRef?.current?.SpliceData(index);
        },
      },
    ]);
  }, []);

  return (
    <SafeAreaView style={styles.container}>
      <SimpleRecycler
        emptyText="No Data Found"
        height={dimensions.height}
        width={dimensions.width}
        rowRenderer={(type, data, index, extendedState) => {
          return (
            <SingleItem
              item={data?.item}
              index={index}
              updateSelection={updateSelection}
              deleteItem={deleteItem}
            />
          );
        }}
        ref={recyclerRef}
        emptyTextStyle={{
          fontSize: 12,
          color: 'gray',
        }}
      />
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: '#d2d2d2',
  },
  box: {
    width: 60,
    height: 60,
    marginVertical: 20,
  },
});

Guides

License

Contact Us