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

UI components for WordPress.

import _extends from "@babel/runtime/helpers/esm/extends";
import { createElement } from "@wordpress/element";

/**
 * External dependencies
 */
import { isFunction } from 'lodash';
/**
 * WordPress dependencies
 */

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

import SlotFillContext from './context';
import useSlot from './use-slot';

function FillComponent({
  name,
  children,
  registerFill,
  unregisterFill
}) {
  const slot = useSlot(name);
  const ref = useRef({
    name,
    children
  });
  useLayoutEffect(() => {
    registerFill(name, ref.current);
    return () => unregisterFill(name, ref.current);
  }, []);
  useLayoutEffect(() => {
    ref.current.children = children;

    if (slot) {
      slot.forceUpdate();
    }
  }, [children]);
  useLayoutEffect(() => {
    if (name === ref.current.name) {
      // ignore initial effect
      return;
    }

    unregisterFill(ref.current.name, ref.current);
    ref.current.name = name;
    registerFill(name, ref.current);
  }, [name]);

  if (!slot || !slot.node) {
    return null;
  } // If a function is passed as a child, provide it with the fillProps.


  if (isFunction(children)) {
    children = children(slot.props.fillProps);
  }

  return createPortal(children, slot.node);
}

const Fill = props => createElement(SlotFillContext.Consumer, null, ({
  registerFill,
  unregisterFill
}) => createElement(FillComponent, _extends({}, props, {
  registerFill: registerFill,
  unregisterFill: unregisterFill
})));

export default Fill;
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