metamask-extension/ui/app/components/info-box/info-box.component.js

import React, { Component } from 'react'
import PropTypes from 'prop-types'

export default class InfoBox extends Component {
  static contextTypes = {
    t: PropTypes.func,
  }

  static propTypes = {
    onClose: PropTypes.func,
    title: PropTypes.string,
    description: PropTypes.string,
  }

  constructor (props) {
    super(props)

    this.state = {
      isShowing: true,
    }
  }

  handleClose () {
    const { onClose } = this.props

    if (onClose) {
      onClose()
    } else {
      this.setState({ isShowing: false })
    }
  }

  render () {
    const { title, description } = this.props

    return !this.state.isShowing
      ? null
      : (
        <div className="info-box">
          <div
            className="info-box__close"
            onClick={() => this.handleClose()}
          />
          <div className="info-box__title">{ title }</div>
          <div className="info-box__description">{ description }</div>
        </div>
      )
  }
}