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Biki-das 6204ea36d3 - fixes component unmounting behaviour in itemSeperatorComponent (#43223) 
Summary:
Reopen in reference to https://github.com/facebook/react-native/issues/42435 , as it had a lot of commits and fixes making it messed up.
Weirdly when using a [Section List](https://reactnative.dev/docs/sectionlist) specifically when using the [SectionSeperatorComponent](https://reactnative.dev/docs/sectionlist#sectionseparatorcomponent), and adding additional Data on the renderItem List, there is a unmount occurring as the new Data is added, this only happens while using the `SectionSeparatorComponent` and limited to the same

**Here is the Current Behaviour**

https://github.com/facebook/react-native/assets/72331432/0622e789-ddbc-4038-8ccc-a421050eecbf

**Here is the Expected Behaviour After Fixes**

https://github.com/facebook/react-native/assets/72331432/2f0cc3a9-da97-43f5-8a4b-3faca74ae834

The issues is happening because the Parent View gets removed, as we add Data, the separator moves causing the unmount, the solution that i proposed here is to conditionally render to make sure that our separator renders correctly which required to add an empty view as the `itemSeparatorComponent`.

## Changelog:
[General] [Added] - Fixes SectionList Unmounting issue with separatorComponent on data addition and removal.

Pull Request resolved: https://github.com/facebook/react-native/pull/43223

Test Plan:
i used the `rn-tester` App to test out the changes below is the code to test the same.
Update the snapshots to align with the changes.

```
import React, {useEffect, useState} from 'react';
import {
  StyleSheet,
  Text,
  View,
  SafeAreaView,
  StatusBar,
  SectionList,
  Image,
} from 'react-native';

interface Item {
  id: string;
  title: string;
  imgSrc: string;
}

interface Section {
  title: string;
  data: Item[];
}

const keyExtractor = (item: Item, index: number) => `${item.title}-${index}`;

const renderItem = ({item, index}: {item: Item; index: number}) => {
  return <ItemComponent item={item} index={index} />;
};

const additionalFruits = [
  {
    id: '7',
    title: 'Sandwich',
    imgSrc:
      'https://img.freepik.com/premium-vector/sanwich-vector-isolated-fast-food_484148-2.jpg',
  },
  {
    id: '8',
    title: 'Burger',
    imgSrc:
      'https://static.vecteezy.com/system/resources/thumbnails/033/494/666/original/animated-illustration-of-burger-cartoon-for-foods-menu-animation-free-video.jpg',
  },
  {
    id: '9',
    title: 'Juice',
    imgSrc:
      'https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQHg9yLXE7Jlq4OM9ey64TW4D9qUFaeGU76rg&usqp=CAU',
  },
  {
    id: '10',
    title: 'Milkshake',
    imgSrc:
      'https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcROpBez3eZKvEVdxBce9XyG6j6caDFMjV_xUQ&usqp=CAU',
  },
];
const DATA: Section[] = [
  {
    title: 'Items',
    data: [
      {
        id: '1',
        title: 'Cake',
        imgSrc:
          'https://static.vecteezy.com/system/resources/previews/012/132/227/original/cute-cake-cartoon-icon-illustration-food-recreation-icon-concept-isolated-premium-flat-cartoon-style-vector.jpg',
      },
      {
        id: '2',
        title: 'Pizza',
        imgSrc:
          'https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcR2kYjlsayzKZx4hFo6fbH7S8pde2JRo2a0hfaeoz3O7bjqdJjhI0tFiSROM8G4UbdbwXU&usqp=CAU',
      },
      {
        id: '3',
        title: 'Coke',
        imgSrc:
          'https://png.pngtree.com/png-clipart/20220116/original/pngtree-cartoon-hand-painted-coke-bottle-png-image_7106844.png',
      },
      {
        id: '4',
        title: 'Noodles',
        imgSrc:
          'https://thumbs.dreamstime.com/z/cute-cartoon-vector-bowl-noodle-isolated-white-background-115120959.jpg',
      },
      {
        id: '5',
        title: 'Pasta',
        imgSrc:
          'https://t4.ftcdn.net/jpg/02/65/00/69/360_F_265006936_2dlz2VtcqZZUbco1VnDpU2diyd8OagFS.jpg',
      },
      {
        id: '6',
        title: 'Fries',
        imgSrc:
          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      },
    ],
  },
];

const ItemComponent = ({item, index}: {item: Item; index: number}) => {
  useEffect(() => {
    console.log('Mount of', index, item.title);
    return () => {
      console.log('Unmount of', index, item.title);
    };
  }, []);

  return (
    <View style={styles.card}>
      <Text style={styles.cardText}>{item.title}</Text>
      <Image source={{uri: item.imgSrc}} style={styles.imageStyles} />
    </View>
  );
};

const App = () => {
  const [data, setData] = useState(DATA);
  const fetchNextPage = () => {
    const newInnerData = [...data[0].data, ...additionalFruits];
    setData([{...data[0], data: newInnerData}]);
  };

  return (
    <SafeAreaView style={styles.container}>
      <View style={styles.scrollView}>
        <SectionList
          keyExtractor={keyExtractor}
          onEndReachedThreshold={0.5}
          onEndReached={fetchNextPage}
          sections={data}
          renderItem={renderItem}
          ItemSeparatorComponent={() => <View style={{height: 16}} />}
          renderSectionHeader={({section}) => (
            <Text style={styles.sectionHeaderText}>{section.title}</Text>
          )}
        />
      </View>
    </SafeAreaView>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#F5F5F5',
    paddingTop: StatusBar.currentHeight,
  },
  scrollView: {
    paddingHorizontal: 16,
  },
  card: {
    backgroundColor: '#FFFFFF',
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    gap: 8,
    height: 200,
    padding: 16,
    borderRadius: 8,
    marginBottom: 16,
    borderWidth: 1,
  },
  cardText: {
    fontSize: 30,
  },
  headerText: {
    fontSize: 24,
    textAlign: 'center',
    marginBottom: 12,
  },
  footerText: {
    fontSize: 24,
    textAlign: 'center',
    marginTop: 12,
  },
  sectionHeaderText: {
    backgroundColor: '#FFFFFF',
    fontSize: 24,
    fontWeight: 'bold',
  },
  imageStyles: {
    height: '100%',
    width: 100,
  },
});

export default App;
```

Reviewed By: yungsters

Differential Revision: D54301991

Pulled By: javache

fbshipit-source-id: d2cfafb1b4eb868761d849111b5abb7e9d584a46
2024-02-29 02:38:46 -08:00
..
Interaction
Reconnect VirtualizedList Source History 2/2 (Apply D41745930 + history, D42805202, D43063551)
2023-02-06 20:00:19 -08:00
Lists
- fixes component unmounting behaviour in itemSeperatorComponent (#43223)
2024-02-29 02:38:46 -08:00
Utilities
Reconnect VirtualizedList Source History 2/2 (Apply D41745930 + history, D42805202, D43063551)
2023-02-06 20:00:19 -08:00
.npmignore
fix[virtualized-lists]: do not ship tests in npm package (#36143)
2023-02-14 04:12:39 -08:00
index.d.ts
Reconnect VirtualizedList Source History 2/2 (Apply D41745930 + history, D42805202, D43063551)
2023-02-06 20:00:19 -08:00
index.js
Enable lint/sort-imports everywhere (#41334)
2023-11-06 12:59:38 -08:00
package.json
fix(virtualized-lists): declare missing react peer dependency (#42947)
2024-02-10 17:03:15 -08:00
README.md
Add missing READMEs & Update package.json in all RN packages (#37090)
2023-04-28 04:26:20 -07:00

README.md

@react-native/virtualized-lists

Version

Installation

yarn add @react-native/virtualized-lists

Note: We're using yarn to install deps. Feel free to change commands to use npm 3+ and npx if you like

Testing

To run the tests in this package, run the following commands from the React Native root folder:

  1. yarn to install the dependencies. You just need to run this once
  2. yarn jest packages/virtualized-lists.
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