@jdcfe/yep-react/lib/mask/fixMask.js

一套移动端的React组件库

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

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

var _closest = _interopRequireDefault(require("../_utils/closest"));

/**
 * 修复Mask组件touch事件穿透
 * 需要滚动的地方请加class: 'Yep-scroller'
 * 参考代码:
 * http://www.zhangxinxu.com/study/201612/mobile-scroll-prevent-window-scroll.html
 */
function fixMask() {
  var data = {
    scroller: null,
    posY: 0,
    scrollY: 0,
    maxscroll: 0
  };

  function isIosModalVisible() {
    return /iPhone|iPod|iPad/i.test(navigator.userAgent) && document.body.className.indexOf('mask-open') > -1;
  }

  document.body.addEventListener('touchstart', function (e) {
    if (!isIosModalVisible()) return;
    var scroller = (0, _closest.default)(e.target, '.Yep-scroller');
    if (!scroller) return;
    data.scroller = scroller; // 垂直位置标记

    data.posY = e.touches[0].pageY;
    data.scrollY = scroller.scrollTop; // 是否可以滚动

    data.maxscroll = scroller.scrollHeight - scroller.clientHeight;
  }, {
    passive: false
  });
  document.body.addEventListener('touchmove', function (e) {
    if (!isIosModalVisible()) return;

    if (!data.scroller) {
      e.preventDefault();
      return;
    } // @ts-ignore


    var scrollTop = data.scroller.scrollTop;
    var distanceY = e.touches[0].pageY - data.posY; // 上下边缘检测

    if (distanceY > 0 && scrollTop === 0) {
      // 往上滑，并且到头
      // 禁止滚动的默认行为
      e.preventDefault();
      return;
    } // 下边缘检测


    if (distanceY < 0 && scrollTop + 1 >= data.maxscroll) {
      // 往下滑，并且到头
      // 禁止滚动的默认行为
      e.preventDefault();
      return;
    }
  }, {
    passive: false
  });
  document.body.addEventListener('touchend', function () {
    if (!isIosModalVisible()) return;
    data.scroller = null;
    data.maxscroll = 0;
  }, {
    passive: false
  });
}