text: /*
   * OS.js - JavaScript Cloud/Web Desktop Platform
   *
   * Copyright (c) 2011-2019, Anders Evenrud <andersevenrud@gmail.com>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * @author  Anders Evenrud <andersevenrud@gmail.com>
   * @licence Simplified BSD License
   */
  
  /**
   * Filter an object based on keys
   * @param {Object} props Props
   * @param {String[]} filterKeys List of keys to filter
   * @return {Object}
   */
  export const filteredProps = (props, filterKeys) => {
    const keys = Object.keys(props);
    const filter = k => filterKeys.indexOf(k) === -1;
  
    return keys
      .filter(filter)
      .reduce((result, k) => Object.assign({
        [k]: props[k]
      }, result), {});
  };
  
  /**
   * Creates a double-tap event handler
   * @param {number} [timeout=250] Timeout
   * @return {Function} Handler with => (ev, cb)
   */
  export const doubleTap = (timeout = 250) => {
    let tapped = false;
    let timer;
  
    return (ev, cb) => {
      timer = clearTimeout(timer);
      timer = setTimeout(() => (tapped = false), timeout);
  
      if (tapped) {
        ev.preventDefault();
        return cb(ev);
      }
  
      tapped = true;
  
      return false;
    };
  };
  