@wordpress/compose/build-module/hooks/use-dragging/index.js

WordPress higher-order components (HOCs).

/**
 * WordPress dependencies
 */
import { useCallback, useEffect, useRef, useState } from '@wordpress/element';
/**
 * Internal dependencies
 */

import useIsomorphicLayoutEffect from '../use-isomorphic-layout-effect';
export default function useDragging({
  onDragStart,
  onDragMove,
  onDragEnd
}) {
  const [isDragging, setIsDragging] = useState(false);
  const eventsRef = useRef({
    onDragStart,
    onDragMove,
    onDragEnd
  });
  useIsomorphicLayoutEffect(() => {
    eventsRef.current.onDragStart = onDragStart;
    eventsRef.current.onDragMove = onDragMove;
    eventsRef.current.onDragEnd = onDragEnd;
  }, [onDragStart, onDragMove, onDragEnd]);
  const onMouseMove = useCallback((...args) => eventsRef.current.onDragMove && eventsRef.current.onDragMove(...args), []);
  const endDrag = useCallback((...args) => {
    if (eventsRef.current.onDragEnd) {
      eventsRef.current.onDragEnd(...args);
    }

    document.removeEventListener('mousemove', onMouseMove);
    document.removeEventListener('mouseup', endDrag);
    setIsDragging(false);
  }, []);
  const startDrag = useCallback((...args) => {
    if (eventsRef.current.onDragStart) {
      eventsRef.current.onDragStart(...args);
    }

    document.addEventListener('mousemove', onMouseMove);
    document.addEventListener('mouseup', endDrag);
    setIsDragging(true);
  }, []); // Remove the global events when unmounting if needed.

  useEffect(() => {
    return () => {
      if (isDragging) {
        document.removeEventListener('mousemove', onMouseMove);
        document.removeEventListener('mouseup', endDrag);
      }
    };
  }, [isDragging]);
  return {
    startDrag,
    endDrag,
    isDragging
  };
}
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