@quantlab/handsontable/commonjs/utils/interval.js

Spreadsheet-like data grid editor that provides copy/paste functionality compatible with Excel/Google Docs

'use strict';

exports.__esModule = true;

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

exports.parseDelay = parseDelay;

var _feature = require('./../helpers/feature');

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

/**
 * @class Interval
 * @util
 */
var Interval = function () {
  _createClass(Interval, null, [{
    key: 'create',
    value: function create(func, delay) {
      return new Interval(func, delay);
    }
  }]);

  function Interval(func, delay) {
    var _this = this;

    _classCallCheck(this, Interval);

    /**
     * Animation frame request id.
     *
     * @type {Number}
     */
    this.timer = null;
    /**
     * Function to invoke repeatedly.
     *
     * @type {Function}
     */
    this.func = func;
    /**
     * Number of milliseconds that function should wait before next call.
     */
    this.delay = parseDelay(delay);
    /**
     * Flag which indicates if interval object was stopped.
     *
     * @type {Boolean}
     * @default true
     */
    this.stopped = true;
    /**
     * Interval time (in milliseconds) of the last callback call.
     *
     * @private
     * @type {Number}
     */
    this._then = null;
    /**
     * Bounded function `func`.
     *
     * @private
     * @type {Function}
     */
    this._callback = function () {
      return _this.__callback();
    };
  }

  /**
   * Start loop.
   *
   * @returns {Interval}
   */


  _createClass(Interval, [{
    key: 'start',
    value: function start() {
      if (this.stopped) {
        this._then = Date.now();
        this.stopped = false;
        this.timer = (0, _feature.requestAnimationFrame)(this._callback);
      }

      return this;
    }

    /**
     * Stop looping.
     *
     * @returns {Interval}
     */

  }, {
    key: 'stop',
    value: function stop() {
      if (!this.stopped) {
        this.stopped = true;
        (0, _feature.cancelAnimationFrame)(this.timer);
        this.timer = null;
      }

      return this;
    }

    /**
     * Loop callback, fired on every animation frame.
     *
     * @private
     */

  }, {
    key: '__callback',
    value: function __callback() {
      this.timer = (0, _feature.requestAnimationFrame)(this._callback);

      if (this.delay) {
        var now = Date.now();
        var elapsed = now - this._then;

        if (elapsed > this.delay) {
          this._then = now - elapsed % this.delay;
          this.func();
        }
      } else {
        this.func();
      }
    }
  }]);

  return Interval;
}();

exports.default = Interval;
function parseDelay(delay) {
  if (typeof delay === 'string' && /fps$/.test(delay)) {
    delay = 1000 / parseInt(delay.replace('fps', '') || 0, 10);
  }

  return delay;
}