@wordpress/components/build-module/higher-order/with-fallback-styles/index.js

UI components for WordPress.

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

/**
 * External dependencies
 */
import fastDeepEqual from 'fast-deep-equal/es6';
/**
 * WordPress dependencies
 */

import { Component } from '@wordpress/element';
import { createHigherOrderComponent } from '@wordpress/compose';
export default (mapNodeToProps => createHigherOrderComponent(WrappedComponent => {
  return class extends Component {
    constructor(props) {
      super(props);
      this.nodeRef = this.props.node;
      this.state = {
        fallbackStyles: undefined,
        grabStylesCompleted: false
      };
      this.bindRef = this.bindRef.bind(this);
    }

    bindRef(node) {
      if (!node) {
        return;
      }

      this.nodeRef = node;
    }

    componentDidMount() {
      this.grabFallbackStyles();
    }

    componentDidUpdate() {
      this.grabFallbackStyles();
    }

    grabFallbackStyles() {
      const {
        grabStylesCompleted,
        fallbackStyles
      } = this.state;

      if (this.nodeRef && !grabStylesCompleted) {
        const newFallbackStyles = mapNodeToProps(this.nodeRef, this.props);

        if (!fastDeepEqual(newFallbackStyles, fallbackStyles)) {
          this.setState({
            fallbackStyles: newFallbackStyles,
            grabStylesCompleted: Object.values(newFallbackStyles).every(Boolean)
          });
        }
      }
    }

    render() {
      const wrappedComponent = createElement(WrappedComponent, _extends({}, this.props, this.state.fallbackStyles));
      return this.props.node ? wrappedComponent : createElement("div", {
        ref: this.bindRef
      }, " ", wrappedComponent, " ");
    }

  };
}, 'withFallbackStyles'));
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