util.js

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _typeof2 = require('babel-runtime/helpers/typeof');

var _typeof3 = _interopRequireDefault(_typeof2);

exports.buffer = buffer;
exports.isSamePoint = isSamePoint;
exports.isWindow = isWindow;

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

function buffer(fn, ms) {
  var timer = void 0;

  function clear() {
    if (timer) {
      clearTimeout(timer);
      timer = null;
    }
  }

  function bufferFn() {
    clear();
    timer = setTimeout(fn, ms);
  }

  bufferFn.clear = clear;

  return bufferFn;
}

function isSamePoint(prev, next) {
  if (prev === next) return true;
  if (!prev || !next) return false;

  if ('pageX' in next && 'pageY' in next) {
    return prev.pageX === next.pageX && prev.pageY === next.pageY;
  }

  if ('clientX' in next && 'clientY' in next) {
    return prev.clientX === next.clientX && prev.clientY === next.clientY;
  }

  return false;
}

function isWindow(obj) {
  return obj && (typeof obj === 'undefined' ? 'undefined' : (0, _typeof3['default'])(obj)) === 'object' && obj.window === obj;
}