text: // @flow
  // Copyright (c) 2015 Uber Technologies, Inc.
  
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  import React from 'react';
  import PropTypes from 'prop-types';
  import BaseControl from './base-control';
  import mapboxgl from '../utils/mapboxgl';
  
  import type {BaseControlProps} from './base-control';
  
  const propTypes = Object.assign({}, BaseControl.propTypes, {
    maxWidth: PropTypes.number,
    unit: PropTypes.oneOf(['imperial', 'metric', 'nautical'])
  });
  
  const defaultProps = Object.assign({}, BaseControl.defaultProps, {
    maxWidth: 100,
    unit: 'metric'
  });
  
  export type ScaleControlProps = BaseControlProps & {
    maxWidth: number,
    unit: string
  };
  
  export default class ScaleControl extends BaseControl<ScaleControlProps, *, HTMLDivElement> {
    static propTypes = propTypes;
    static defaultProps = defaultProps;
  
    componentDidMount() {
      const mapboxScaleControl = new mapboxgl.ScaleControl();
      mapboxScaleControl._map = this._context.map;
      mapboxScaleControl._container = this._containerRef.current;
      this._mapboxScaleControl = mapboxScaleControl;
  
      this._update();
    }
  
    _control: any = null;
    _mapboxScaleControl: any = null;
  
    _update() {
      const mapboxScaleControl = this._mapboxScaleControl;
      if (mapboxScaleControl) {
        mapboxScaleControl.options = this.props;
        mapboxScaleControl._onMove();
      }
    }
  
    _render() {
      this._control = this._control || (
        <div ref={this._containerRef} className="mapboxgl-ctrl mapboxgl-ctrl-scale" />
      );
      // Likely viewport has changed
      this._update();
  
      return this._control;
    }
  }
  