content: import React from 'react';
  import PropTypes from 'prop-types';
  import Motion from '../../ui/util/optional_motion';
  import spring from 'react-motion/lib/spring';
  import { FormattedMessage } from 'react-intl';
  
  export default class UploadArea extends React.PureComponent {
  
    static propTypes = {
      active: PropTypes.bool,
      onClose: PropTypes.func,
    };
  
    handleKeyUp = (e) => {
      const keyCode = e.keyCode;
      if (this.props.active) {
        switch(keyCode) {
        case 27:
          e.preventDefault();
          e.stopPropagation();
          this.props.onClose();
          break;
        }
      }
    }
  
    componentDidMount () {
      window.addEventListener('keyup', this.handleKeyUp, false);
    }
  
    componentWillUnmount () {
      window.removeEventListener('keyup', this.handleKeyUp);
    }
  
    render () {
      const { active } = this.props;
  
      return (
        <Motion defaultStyle={{ backgroundOpacity: 0, backgroundScale: 0.95 }} style={{ backgroundOpacity: spring(active ? 1 : 0, { stiffness: 150, damping: 15 }), backgroundScale: spring(active ? 1 : 0.95, { stiffness: 200, damping: 3 }) }}>
          {({ backgroundOpacity, backgroundScale }) => (
            <div className='upload-area' style={{ visibility: active ? 'visible' : 'hidden', opacity: backgroundOpacity }}>
              <div className='upload-area__drop'>
                <div className='upload-area__background' style={{ transform: `scale(${backgroundScale})` }} />
                <div className='upload-area__content'><FormattedMessage id='upload_area.title' defaultMessage='Drag & drop to upload' /></div>
              </div>
            </div>
          )}
        </Motion>
      );
    }
  
  }
  