# All files / react/Overlay index.jsx

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    2x

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     import React, { Component } from 'react'
    import styles from './styles.styl'
    import cx from 'classnames'

    const disableScroll = node => {
      const previousOverflow = node.style.overflow
      node.style.overflow = 'hidden'
      return () => {
        node.style.overflow = previousOverflow
      }
    }

    const ESC_KEYCODE = 27

    const bodyTallerThanWindow = () => {
      return document.body.getBoundingClientRect().height > window.innerHeight
    }

    /**
     * Display a black overlay on the screen. Stops
     * scrolling on the html/body while displayed.
     *
     * Can react to Escape key
     */
    class Overlay extends Component {
      componentDidMount() {
        if (bodyTallerThanWindow()) {
          this.restoreScrollBody = disableScroll(document.body)
          this.restoreScrollHtml = disableScroll(document.body.parentNode)
        }
        if (this.props.onEscape) {
          document.addEventListener('keydown', this.handleKeydown)
        }
      }

      handleKeydown = e => {
        if (e.keyCode === ESC_KEYCODE) {
          this.props.onEscape()
        }
      }

      componentWillUnmount() {
        // restauration function can be undefined if there was
        // an error during mounting/rendering
        this.restoreScrollBody && this.restoreScrollBody()
        this.restoreScrollBody && this.restoreScrollHtml()
        if (this.props.onEscape) {
          document.removeEventListener('keydown', this.handleKeydown)
        }
      }

      handleClick = e => {
        if (this.props.onClick && e.target === e.currentTarget) {
          this.props.onClick()
        }
      }

      render() {
        const { children, className, ...rest } = this.props

        return (
          <div
            onClick={this.handleClick}
            className={cx(styles['c-overlay'], className)}
            {...rest}
          >
            {children}
          </div>
        )
      }
    }

    export default Overlay