@reactual/handsontable/src/helpers/feature.js

Spreadsheet-like data grid editor

// https://gist.github.com/paulirish/1579671
let lastTime = 0;
let vendors = ['ms', 'moz', 'webkit', 'o'];
let _requestAnimationFrame = window.requestAnimationFrame;
let _cancelAnimationFrame = window.cancelAnimationFrame;

for (let x = 0; x < vendors.length && !_requestAnimationFrame; ++x) {
  _requestAnimationFrame = window[`${vendors[x]}RequestAnimationFrame`];
  _cancelAnimationFrame = window[`${vendors[x]}CancelAnimationFrame`] || window[`${vendors[x]}CancelRequestAnimationFrame`];
}

if (!_requestAnimationFrame) {
  _requestAnimationFrame = function(callback) {
    let currTime = new Date().getTime();
    let timeToCall = Math.max(0, 16 - (currTime - lastTime));
    let id = window.setTimeout(() => {
      callback(currTime + timeToCall);
    }, timeToCall);
    lastTime = currTime + timeToCall;

    return id;
  };
}

if (!_cancelAnimationFrame) {
  _cancelAnimationFrame = function(id) {
    clearTimeout(id);
  };
}

/**
 * Polyfill for requestAnimationFrame
 *
 * @param {Function} callback
 * @returns {Number}
 */
export function requestAnimationFrame(callback) {
  return _requestAnimationFrame.call(window, callback);
}

/**
 * Polyfill for cancelAnimationFrame
 *
 * @param {Number} id
 */
export function cancelAnimationFrame(id) {
  _cancelAnimationFrame.call(window, id);
}

export function isTouchSupported() {
  return ('ontouchstart' in window);
}

/**
 * Checks if browser is support web components natively
 *
 * @returns {Boolean}
 */
export function isWebComponentSupportedNatively() {
  var test = document.createElement('div');

  return !!(test.createShadowRoot && test.createShadowRoot.toString().match(/\[native code\]/));
}

var _hasCaptionProblem;

function detectCaptionProblem() {
  var TABLE = document.createElement('TABLE');
  TABLE.style.borderSpacing = 0;
  TABLE.style.borderWidth = 0;
  TABLE.style.padding = 0;
  var TBODY = document.createElement('TBODY');
  TABLE.appendChild(TBODY);
  TBODY.appendChild(document.createElement('TR'));
  TBODY.firstChild.appendChild(document.createElement('TD'));
  TBODY.firstChild.firstChild.innerHTML = '<tr><td>t<br>t</td></tr>';

  var CAPTION = document.createElement('CAPTION');
  CAPTION.innerHTML = 'c<br>c<br>c<br>c';
  CAPTION.style.padding = 0;
  CAPTION.style.margin = 0;
  TABLE.insertBefore(CAPTION, TBODY);

  document.body.appendChild(TABLE);
  _hasCaptionProblem = (TABLE.offsetHeight < 2 * TABLE.lastChild.offsetHeight); // boolean
  document.body.removeChild(TABLE);
}

export function hasCaptionProblem() {
  if (_hasCaptionProblem === void 0) {
    detectCaptionProblem();
  }

  return _hasCaptionProblem;
}

let comparisonFunction;

/**
 * Get string comparison function for sorting purposes. It supports multilingual string comparison base on Internationalization API.
 *
 * @param {String} [language]
 * @param {Object} [options]
 * @returns {*}
 */
export function getComparisonFunction(language, options = {}) {
  if (comparisonFunction) {
    return comparisonFunction;
  }

  if (typeof Intl === 'object') {
    comparisonFunction = new Intl.Collator(language, options).compare;

  } else if (typeof String.prototype.localeCompare === 'function') {
    comparisonFunction = (a, b) => (`${a}`).localeCompare(b);

  } else {
    comparisonFunction = (a, b) => {
      if (a === b) {
        return 0;
      }

      return a > b ? -1 : 1;
    };
  }

  return comparisonFunction;
}