flatlist.md

Bottom Sheet FlatList

Is an extended component of FlatList from react-native, with bottom sheet integrations.

Props

focusHook

This needed when bottom sheet used with multiple scrollables to allow bottom sheet detect the current scrollable ref, especially when used with React Navigation. You will need to provide useFocusEffect from @react-navigation/native.

required: NO | type: (effect: EffectCallback, deps?: DependencyList) => void | default: React.useEffect

Example

import React, { useCallback, useRef, useMemo } from 'react';
import { StyleSheet, View, Text, Button } from 'react-native';
import BottomSheet, { BottomSheetFlatList } from '@gorhom/bottom-sheet';

const App = () => {
  // hooks
  const sheetRef = useRef<BottomSheet>(null);

  // variables
  const data = useMemo(
    () =>
      Array(50)
        .fill(0)
        .map((_, index) => `index-${index}`),
    []
  );
  const snapPoints = useMemo(() => ['25%', '50%', '90%'], []);

  // callbacks
  const handleSheetChange = useCallback(index => {
    console.log('handleSheetChange', index);
  }, []);
  const handleSnapPress = useCallback(index => {
    sheetRef.current?.snapTo(index);
  }, []);
  const handleClosePress = useCallback(() => {
    sheetRef.current?.close();
  }, []);

  // render
  const renderItem = useCallback(
    ({ item }) => (
      <View style={styles.itemContainer}>
        <Text>{item}</Text>
      </View>
    ),
    []
  );
  return (
    <View style={styles.container}>
      <Button title="Snap To 90%" onPress={() => handleSnapPress(2)} />
      <Button title="Snap To 50%" onPress={() => handleSnapPress(1)} />
      <Button title="Snap To 25%" onPress={() => handleSnapPress(0)} />
      <Button title="Close" onPress={() => handleClosePress()} />
      <BottomSheet
        ref={sheetRef}
        initialSnapIndex={1}
        snapPoints={snapPoints}
        onChange={handleSheetChange}
      >
        <BottomSheetFlatList
          data={data}
          keyExtractor={i => i}
          renderItem={renderItem}
          contentContainerStyle={styles.contentContainer}
        />
      </BottomSheet>
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    paddingTop: 200,
  },
  contentContainer: {
    backgroundColor: 'white',
  },
  itemContainer: {
    padding: 6,
    margin: 6,
    backgroundColor: '#eee',
  },
});

export default App;