@gdjiami/hooks/ie8/utils.js

react hooks for mygzb.com

import _extends from "@babel/runtime/helpers/esm/extends";
export var TOUCH_SUPPROTED = 'TouchEvent' in window;
export var GestureCoordinateKeys = ['clientX', 'clientY', 'pageX', 'pageY', 'screenX', 'screenY'];
export function isMouseEvent(evt) {
  if (evt.type.startsWith('mouse')) {
    return true;
  }

  return false;
}
export function pickProperties(obj, keys) {
  var newobj = {};

  for (var _iterator = keys, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
    var _ref;

    if (_isArray) {
      if (_i >= _iterator.length) break;
      _ref = _iterator[_i++];
    } else {
      _i = _iterator.next();
      if (_i.done) break;
      _ref = _i.value;
    }

    var key = _ref;
    newobj[key] = obj[key];
  }

  return newobj;
}
/**
 * 获取MouseEvent或TouchEvent中的坐标
 * @param evt
 */

export function extraPosition(evt, id) {
  if (isMouseEvent(evt)) {
    return pickProperties(evt, GestureCoordinateKeys);
  }

  var touch;

  if (id) {
    for (var i = 0; i < evt.touches.length; i++) {
      if (evt.touches[i].identifier === id) {
        touch = evt.touches[i];
        break;
      }
    }

    if (touch == null) {
      return;
    }
  } else {
    touch = evt.targetTouches[0];
  }

  return _extends({}, pickProperties(touch, GestureCoordinateKeys), {
    id: touch.identifier
  });
}
/**
 * 获取多点触摸
 */

export function extraPositions(evt) {
  if (isMouseEvent(evt)) {
    return [_extends({
      id: 0
    }, pickProperties(evt, GestureCoordinateKeys))];
  }

  return Array.prototype.map.call(evt.changedTouches, function (touch) {
    return _extends({
      id: touch.identifier
    }, pickProperties(touch, GestureCoordinateKeys));
  });
}
export function clamp(num, lower, upper) {
  if (num === num) {
    if (upper !== undefined) {
      num = num <= upper ? num : upper;
    }

    if (lower !== undefined) {
      num = num >= lower ? num : lower;
    }
  }

  return num;
}
var uid = 0;
export function getUid() {
  return uid = uid + 1 % (Number.MAX_SAFE_INTEGER - 1);
}