@ja-ka/react-native-fade-in-flatlist/lib/FadeInFlatList/index.js

An advanced React Native FlatList component with fade-in support for rendered items.

var __rest = (this && this.__rest) || function (s, e) {
    var t = {};
    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
        t[p] = s[p];
    if (s != null && typeof Object.getOwnPropertySymbols === "function")
        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable.call(s, p[i]))
                t[p[i]] = s[p[i]];
        }
    return t;
};
import React, { useCallback, useEffect, useRef } from 'react';
import { Animated, Easing, FlatList } from 'react-native';
const FadeInFlatList = React.forwardRef((_a, ref) => {
    var { itemsToFadeIn = 10, initialDelay = 0, durationPerItem = 50, parallelItems = 1, renderItem: originalRenderItem, ItemSeparatorComponent } = _a, props = __rest(_a, ["itemsToFadeIn", "initialDelay", "durationPerItem", "parallelItems", "renderItem", "ItemSeparatorComponent"]);
    const value = useRef(new Animated.Value(0));
    const FadeInComponent = useCallback(({ index, children }) => {
        const moveBy = (1 - 1 / parallelItems) * index;
        return (<Animated.View style={{
                opacity: value.current.interpolate({
                    inputRange: [
                        index - 1 - moveBy,
                        index - moveBy,
                        index + 1 - moveBy,
                        index + 2 - moveBy,
                    ],
                    outputRange: [0, 0, 1, 1],
                    extrapolate: 'clamp',
                }),
            }}>
          {children}
        </Animated.View>);
    }, []);
    const Separator = useCallback(({ index }) => ItemSeparatorComponent && index !== undefined ? (<FadeInComponent index={index}>
          <ItemSeparatorComponent />
        </FadeInComponent>) : ItemSeparatorComponent ? (<ItemSeparatorComponent />) : null, []);
    const Item = useCallback(({ info }) => {
        useEffect(() => {
            info.separators.updateProps('leading', { index: info.index });
        }, []);
        // @ts-expect-error ts(2322)
        return <FadeInComponent index={info.index}>{originalRenderItem(info)}</FadeInComponent>;
    }, []);
    const renderItem = useCallback((info) => info.index < itemsToFadeIn ? <Item info={info}/> : originalRenderItem(info), [originalRenderItem, itemsToFadeIn]);
    useEffect(() => {
        value.current.setValue(0);
        Animated.timing(value.current, {
            toValue: itemsToFadeIn + 1,
            useNativeDriver: true,
            delay: initialDelay,
            duration: itemsToFadeIn * durationPerItem,
            easing: Easing.linear,
        }).start();
    }, [initialDelay, durationPerItem, itemsToFadeIn]);
    return (<FlatList {...props} ref={ref} renderItem={renderItem} ItemSeparatorComponent={ItemSeparatorComponent ? Separator : null}/>);
});
export default FadeInFlatList;