import {
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publishHandler
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} from 'uni-platform/view/bridge'
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export function disableScroll (evt) {
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evt.preventDefault()
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}
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export function pageScrollTo ({
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scrollTop,
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selector,
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duration
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}) {
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if (typeof scrollTop === 'undefined') {
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const el = document.querySelector(selector)
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if (el) {
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const { top, height } = el.getBoundingClientRect()
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scrollTop = top + window.pageYOffset
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if (__PLATFORM__ === 'h5') {
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scrollTop -= height
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}
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}
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}
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const documentElement = document.documentElement
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const {
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clientHeight,
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scrollHeight
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} = documentElement
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scrollTop = Math.min(scrollTop, scrollHeight - clientHeight)
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if (duration === 0) {
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// 部分浏览器（比如微信）中 scrollTop 的值需要通过 document.body 来控制
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documentElement.scrollTop = document.body.scrollTop = scrollTop
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return
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}
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if (window.scrollY === scrollTop) {
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return
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}
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function scrollTo (duration) {
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if (duration <= 0) {
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window.scrollTo(0, scrollTop)
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return
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}
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const distaince = scrollTop - window.scrollY
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requestAnimationFrame(function () {
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window.scrollTo(0, window.scrollY + distaince / duration * 10)
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scrollTo(duration - 10)
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})
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}
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scrollTo(duration)
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// TODO 暂不使用 transform 会导致 fixed 元素不可见
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// const body = document.body
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// const bodyStyle = body.style
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//
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// function webkitTransitionEnd() {
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// bodyStyle.webkitTransition = ''
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// bodyStyle.webkitTransform = ''
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// documentElement.scrollTop = scrollTop
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// body.removeEventListener('webkitTransitionEnd', webkitTransitionEnd)
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// }
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//
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// body.addEventListener('webkitTransitionEnd', webkitTransitionEnd)
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// bodyStyle.webkitTransition = `-webkit-transform ${duration}ms ease-out`
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// bodyStyle.webkitTransform = `translateY(${documentElement.scrollTop}px) translateZ(0)`
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}
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let testReachBottomTimer
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let lastScrollHeight = 0
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export function createScrollListener (pageId, {
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enablePageScroll,
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enablePageReachBottom,
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onReachBottomDistance,
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enableTransparentTitleNView
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}) {
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let ticking = false
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let hasReachBottom = false
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let onReachBottom = true
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function isReachBottom () {
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const {
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scrollHeight
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} = document.documentElement
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// 部分浏览器窗口高度变化后document.documentelement.clientheight不会变化，采用window.innerHeight
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const windowHeight = window.innerHeight
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const scrollY = window.scrollY
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const isBottom = scrollY > 0 && scrollHeight > windowHeight && (scrollY + windowHeight + onReachBottomDistance) >= scrollHeight
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// 兼容部分浏览器滚动时scroll事件不触发
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const heightChanged = Math.abs(scrollHeight - lastScrollHeight) > onReachBottomDistance
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if (isBottom && (!hasReachBottom || heightChanged)) {
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lastScrollHeight = scrollHeight
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hasReachBottom = true
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return true
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}
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if (!isBottom && hasReachBottom) {
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hasReachBottom = false
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}
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return false
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}
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function trigger () {
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const pages = getCurrentPages()
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if (!pages.length || pages[pages.length - 1].$page.id !== pageId) {
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return
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}
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// publish
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const scrollTop = window.pageYOffset
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if (enablePageScroll) { // 向 Service 发送 onPageScroll 事件
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publishHandler('onPageScroll', {
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scrollTop
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}, pageId)
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}
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if (enableTransparentTitleNView) {
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UniViewJSBridge.emit('onPageScroll', {
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scrollTop
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})
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}
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function testReachBottom () {
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if (isReachBottom()) {
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publishHandler('onReachBottom', {}, pageId)
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onReachBottom = false
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setTimeout(function () {
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onReachBottom = true
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}, 350)
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return true
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}
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}
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if (enablePageReachBottom && onReachBottom) {
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if (testReachBottom()) {
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} else {
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// 解决部分浏览器滚动中js获取窗口高度不准确导致的问题
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testReachBottomTimer = setTimeout(testReachBottom, 300)
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}
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}
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ticking = false
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}
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return function onScroll () {
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clearTimeout(testReachBottomTimer)
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if (!ticking) {
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requestAnimationFrame(trigger)
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}
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ticking = true
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}
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}
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