128 lines
2.8 KiB
Vue
128 lines
2.8 KiB
Vue
<template>
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<div v-show="maskLayerShow" class="mask-layer" @touchmove.prevent @wheel.prevent>
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<div class="mask-layer__content" @touchmove.stop>
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<slot></slot>
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</div>
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</div>
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</template>
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<script setup>
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import { onUnmounted, watch } from 'vue'
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const props = defineProps({
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maskLayerShow: {
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type: Boolean,
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required: true,
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},
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})
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let lockCount = 0
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let lockedScrollY = 0
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let previousBodyStyle = {}
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let previousHtmlStyle = {}
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const getStyleSnapshot = (el) => ({
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overflow: el.style.overflow,
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position: el.style.position,
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top: el.style.top,
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left: el.style.left,
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right: el.style.right,
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width: el.style.width,
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touchAction: el.style.touchAction,
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overscrollBehavior: el.style.overscrollBehavior,
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})
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const restoreStyleSnapshot = (el, style) => {
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Object.keys(style).forEach((key) => {
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el.style[key] = style[key]
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})
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}
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// 弹窗展示时锁住背景页滚动，iOS 需要固定 body 并在关闭后恢复滚动位置。
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const lockPageScroll = () => {
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if (typeof window === 'undefined' || typeof document === 'undefined') return
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if (lockCount === 0) {
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const body = document.body
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const html = document.documentElement
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lockedScrollY = window.scrollY || html.scrollTop || body.scrollTop || 0
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previousBodyStyle = getStyleSnapshot(body)
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previousHtmlStyle = getStyleSnapshot(html)
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html.style.overflow = 'hidden'
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html.style.touchAction = 'none'
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html.style.overscrollBehavior = 'none'
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body.style.overflow = 'hidden'
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body.style.position = 'fixed'
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body.style.top = `-${lockedScrollY}px`
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body.style.left = '0'
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body.style.right = '0'
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body.style.width = '100%'
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body.style.touchAction = 'none'
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body.style.overscrollBehavior = 'none'
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}
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lockCount += 1
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}
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const unlockPageScroll = () => {
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if (typeof window === 'undefined' || typeof document === 'undefined') return
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if (lockCount <= 0) return
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lockCount -= 1
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if (lockCount === 0) {
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restoreStyleSnapshot(document.body, previousBodyStyle)
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restoreStyleSnapshot(document.documentElement, previousHtmlStyle)
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window.scrollTo(0, lockedScrollY)
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}
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}
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watch(
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() => props.maskLayerShow,
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(newVal) => {
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if (newVal) {
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lockPageScroll()
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} else {
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unlockPageScroll()
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}
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},
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{ immediate: true }
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)
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onUnmounted(() => {
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if (props.maskLayerShow) {
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unlockPageScroll()
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}
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})
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</script>
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<style lang="scss" scoped>
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* {
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color: black;
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}
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.mask-layer {
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width: 100vw;
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height: 100vh;
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background-color: #00000080;
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position: fixed;
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inset: 0;
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z-index: 10000;
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overflow: hidden;
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touch-action: none;
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overscroll-behavior: none;
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-webkit-tap-highlight-color: transparent;
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}
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.mask-layer__content {
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position: absolute;
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inset: 0;
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overflow-y: auto;
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-webkit-overflow-scrolling: touch;
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overscroll-behavior: contain;
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}
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</style>
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