@wordpress/components/build-module/slot-fill/bubbles-virtually/fill.js

UI components for WordPress.

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

import useSlot from './use-slot';

function useForceUpdate() {
  const [, setState] = useState({});
  const mounted = useRef(true);
  useEffect(() => {
    return () => {
      mounted.current = false;
    };
  }, []);
  return () => {
    if (mounted.current) {
      setState({});
    }
  };
}

export default function Fill({
  name,
  children
}) {
  const slot = useSlot(name);
  const ref = useRef({
    rerender: useForceUpdate()
  });
  useEffect(() => {
    // We register fills so we can keep track of their existance.
    // Some Slot implementations need to know if there're already fills
    // registered so they can choose to render themselves or not.
    slot.registerFill(ref);
    return () => {
      slot.unregisterFill(ref);
    };
  }, [slot.registerFill, slot.unregisterFill]);

  if (!slot.ref || !slot.ref.current) {
    return null;
  }

  if (typeof children === 'function') {
    children = children(slot.fillProps);
  }

  return createPortal(children, slot.ref.current);
}
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