Pipefy-UI/src/components/Card/index.js

import React, { useRef, useContext } from 'react';
import { useDrag, useDrop } from 'react-dnd';

import BoardContext from '../Board/context';

import { Container, Label } from './styles';

export default function Card({ data, index, listIndex }) {
  const ref = useRef();
  const { move } = useContext(BoardContext);

  const [{ isDragging }, dragRef] = useDrag({
    item: {
      type: 'CARD',
      index,
      listIndex
    },
    collect: monitor => ({
      isDragging: monitor.isDragging(),
    })
  });

  const [, dropRef] = useDrop({
    accept: 'CARD',
    hover(item, monitor){
      const draggedListIndex = item.listIndex;
      const targetListIndex = listIndex;

      const draggedIndex = item.index;
      const targetIndex = index;

      if (draggedIndex == targetIndex && draggedListIndex == targetListIndex){
        return;
      }

      const targetSize = ref.current.getBoundingClientRect();
      const targetCenter = (targetSize.bottom - targetSize.top) / 2;

      const draggedOffset = monitor.getClientOffset();
      const draggedTop = draggedOffset.y - targetSize.top;

      if (draggedIndex < targetIndex && draggedTop < targetCenter){
        return;
      }
      if (draggedIndex > targetIndex && draggedTop > targetCenter){
        return;
      }

      move(draggedListIndex, targetListIndex, draggedIndex, targetIndex);

      item.index = targetIndex;
      item.listIndex = targetListIndex;
    }
  });

  dragRef(dropRef(ref));

  return (
    <Container ref={ref} isDragging={isDragging}>
      <header>
        {
          data.labels.map(label => <Label key={label} color={label} />)
        }
      </header>
      <p>{data.content}</p>
      {data.user && (
        <img src={data.user} alt=""/>
      )}
    </Container>
  );
}