react-native-reorderable-list/src/hooks/useReorderableDragEnd.ts

Reorderable list for React Native applications, powered by Reanimated

import {useEffect} from 'react';

import {useContext} from './useContext';
import {ReorderableCellContext, ReorderableListContext} from '../contexts';

export const useReorderableDragEnd = (
  onEnd: (from: number, to: number) => void,
) => {
  const {dragEndHandlers} = useContext(ReorderableListContext);
  const {index} = useContext(ReorderableCellContext);

  useEffect(() => {
    dragEndHandlers.modify(value => {
      'worklet';

      if (!Array.isArray(value[index])) {
        value[index] = [];
      }

      value[index].push(onEnd);

      return value;
    });

    return () => {
      dragEndHandlers.modify(value => {
        'worklet';

        if (Array.isArray(value[index])) {
          value[index] = value[index].filter(x => x.name !== onEnd.name);
        }

        return value;
      });
    };
  }, [index, dragEndHandlers, onEnd]);
};