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Viewing file:     iosFix.js (2.72 KB)      -rwxrwxr-x

/* istanbul ignore file */
import * as dom from './dom/index.js'
import { swalClasses } from '../utils/classes.js'

// Fix iOS scrolling http://stackoverflow.com/q/39626302

export const iOSfix = () => {
  const iOS =
    // @ts-ignore
    (/iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream) ||
    (navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1)
  if (iOS && !dom.hasClass(document.body, swalClasses.iosfix)) {
    const offset = document.body.scrollTop
    document.body.style.top = `${offset * -1}px`
    dom.addClass(document.body, swalClasses.iosfix)
    lockBodyScroll()
    addBottomPaddingForTallPopups()
  }
}

/**
 * https://github.com/sweetalert2/sweetalert2/issues/1948
 */
const addBottomPaddingForTallPopups = () => {
  const ua = navigator.userAgent
  const iOS = !!ua.match(/iPad/i) || !!ua.match(/iPhone/i)
  const webkit = !!ua.match(/WebKit/i)
  const iOSSafari = iOS && webkit && !ua.match(/CriOS/i)
  if (iOSSafari) {
    const bottomPanelHeight = 44
    if (dom.getPopup().scrollHeight > window.innerHeight - bottomPanelHeight) {
      dom.getContainer().style.paddingBottom = `${bottomPanelHeight}px`
    }
  }
}

/**
 * https://github.com/sweetalert2/sweetalert2/issues/1246
 */
const lockBodyScroll = () => {
  const container = dom.getContainer()
  let preventTouchMove
  container.ontouchstart = (e) => {
    preventTouchMove = shouldPreventTouchMove(e)
  }
  container.ontouchmove = (e) => {
    if (preventTouchMove) {
      e.preventDefault()
      e.stopPropagation()
    }
  }
}

const shouldPreventTouchMove = (event) => {
  const target = event.target
  const container = dom.getContainer()
  if (isStylus(event) || isZoom(event)) {
    return false
  }
  if (target === container) {
    return true
  }
  if (
    !dom.isScrollable(container) &&
    target.tagName !== 'INPUT' && // #1603
    target.tagName !== 'TEXTAREA' && // #2266
    !(
      dom.isScrollable(dom.getHtmlContainer()) && // #1944
      dom.getHtmlContainer().contains(target)
    )
  ) {
    return true
  }
  return false
}

/**
 * https://github.com/sweetalert2/sweetalert2/issues/1786
 *
 * @param {*} event
 * @returns {boolean}
 */
const isStylus = (event) => {
  return event.touches && event.touches.length && event.touches[0].touchType === 'stylus'
}

/**
 * https://github.com/sweetalert2/sweetalert2/issues/1891
 *
 * @param {TouchEvent} event
 * @returns {boolean}
 */
const isZoom = (event) => {
  return event.touches && event.touches.length > 1
}

export const undoIOSfix = () => {
  if (dom.hasClass(document.body, swalClasses.iosfix)) {
    const offset = parseInt(document.body.style.top, 10)
    dom.removeClass(document.body, swalClasses.iosfix)
    document.body.style.top = ''
    document.body.scrollTop = offset * -1
  }
}