@material-ui/core/es/RootRef/RootRef.js

React components that implement Google's Material Design.

import React from 'react';
import ReactDOM from 'react-dom';
import PropTypes from 'prop-types';
import exactProp from '../utils/exactProp';
import { setRef } from '../utils/reactHelpers';
/**
 * Helper component to allow attaching a ref to a
 * wrapped element to access the underlying DOM element.
 *
 * It's highly inspired by https://github.com/facebook/react/issues/11401#issuecomment-340543801.
 * For example:
 * ```jsx
 * import React from 'react';
 * import RootRef from '@material-ui/core/RootRef';
 *
 * class MyComponent extends React.Component {
 *   constructor() {
 *     super();
 *     this.domRef = React.createRef();
 *   }
 *
 *   componentDidMount() {
 *     console.log(this.domRef.current); // DOM node
 *   }
 *
 *   render() {
 *     return (
 *       <RootRef rootRef={this.domRef}>
 *         <SomeChildComponent />
 *       </RootRef>
 *     );
 *   }
 * }
 * ```
 */

class RootRef extends React.Component {
  componentDidMount() {
    this.ref = ReactDOM.findDOMNode(this);
    setRef(this.props.rootRef, this.ref);
  }

  componentDidUpdate(prevProps) {
    const ref = ReactDOM.findDOMNode(this);

    if (prevProps.rootRef !== this.props.rootRef || this.ref !== ref) {
      if (prevProps.rootRef !== this.props.rootRef) {
        setRef(prevProps.rootRef, null);
      }

      this.ref = ref;
      setRef(this.props.rootRef, this.ref);
    }
  }

  componentWillUnmount() {
    this.ref = null;
    setRef(this.props.rootRef, null);
  }

  render() {
    return this.props.children;
  }

}

RootRef.propTypes = process.env.NODE_ENV !== "production" ? {
  /**
   * The wrapped element.
   */
  children: PropTypes.element.isRequired,

  /**
   * Provide a way to access the DOM node of the wrapped element.
   * You can provide a callback ref or a `React.createRef()` ref.
   */
  rootRef: PropTypes.oneOfType([PropTypes.func, PropTypes.object]).isRequired
} : {};
RootRef.propTypes = process.env.NODE_ENV !== "production" ? exactProp(RootRef.propTypes) : {};
export default RootRef;