220 lines
7.0 KiB
JavaScript
220 lines
7.0 KiB
JavaScript
const Helper = {
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init: function(vnode, filename, options) {
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vnode.state.domImg = null
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vnode.state.domVideo = null
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vnode.state.domContainer = null
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vnode.state.videoShow = false
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vnode.state.videoFilename = filename
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vnode.state.resizePauseTimeout = null
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vnode.state.resizeTimeout = null
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vnode.state.videoResizeThrottler = Helper.resizeThrottler.bind(vnode.state, vnode)
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vnode.state.scrollListener = null
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vnode.state.scrollListenerTicking = false
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vnode.state.scrollListenerWaiting = []
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vnode.state.videoVisibilityHidden = ''
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vnode.state.videoVisibilityEvent = null
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vnode.state.videoVisibilityChanged = null
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vnode.state.videoResizeRatio = options && options.ratio || 1
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vnode.state.videoUrl = screen.width > 1280
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? '/assets/cover/' + filename + '_1080.mp4'
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: '/assets/cover/' + filename + '_720.mp4'
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},
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clear: function(vnode) {
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vnode.state.scrollListenerWaiting.splice(0, vnode.state.scrollListenerWaiting.length)
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window.removeEventListener('resize', vnode.state.videoResizeThrottler)
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window.removeEventListener('scroll', vnode.state.scrollListener, false)
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window.removeEventListener(vnode.state.videoVisibilityEvent, vnode.state.videoVisibilityChanged)
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},
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scrollListener: function(vnode) {
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if (!vnode.state.scrollListenerWaiting.length) return
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let scrollTop = window.pageYOffset
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let height = window.innerHeight
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for (var i = 0; i < vnode.state.scrollListenerWaiting.length; i++) {
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Helper.scrollItemIsVisible(vnode, vnode.state.scrollListenerWaiting[i], scrollTop, height)
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}
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},
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scrollCheckEmpty: function(vnode) {
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if (vnode.state.scrollListenerWaiting.length) return
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vnode.state.scrollListener = null
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window.removeEventListener('scroll', vnode.state.scrollListener, false)
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},
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scrollAddItem: function(vnode, options) {
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let bound = options.dom.getBoundingClientRect()
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let scrollTop = window.pageYOffset
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let item = {
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dom: options.dom,
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threshold: options.threshold || 100,
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top: Math.round(bound.top) + Math.round(scrollTop),
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className: ' ' + options.className,
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ticking: false,
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}
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vnode.state.scrollListenerWaiting.push(item)
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if (!vnode.state.scrollListener) {
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vnode.state.scrollListener = Helper.scrollListener.bind(vnode.state, vnode)
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window.addEventListener('scroll', vnode.state.scrollListener, false)
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}
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Helper.scrollItemIsVisible(vnode, item, window.pageYOffset, window.innerHeight)
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},
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scrollResetBound: function(vnode) {
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let scrollTop = window.pageYOffset
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vnode.state.scrollListenerWaiting.forEach(function (item) {
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let bound = item.dom.getBoundingClientRect()
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item.top = Math.round(bound.top) + Math.round(scrollTop)
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})
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},
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scrollItemIsVisible: function(vnode, item, scrollTop, height) {
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if (item.ticking) return
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if (item.top - item.threshold < scrollTop + height) {
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item.ticking = true
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requestAnimationFrame(function() {
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item.dom.className += item.className
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let index = vnode.state.scrollListenerWaiting.indexOf(item)
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if (index >= 0) {
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vnode.state.scrollListenerWaiting.splice(index, 1)
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}
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Helper.scrollCheckEmpty(vnode)
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})
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}
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},
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checkCreated: function(vnode) {
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if (!vnode.state.domImg || !vnode.state.domVideo || !vnode.state.domContainer) return
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vnode.state.videoShow = Boolean(vnode.state.domVideo.play)
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window.addEventListener('resize', vnode.state.videoResizeThrottler, false)
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Helper.resizeHandler(vnode)
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if (vnode.state.videoShow) {
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vnode.state.domVideo.play()
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if (typeof document.hidden !== 'undefined') { // Opera 12.10 and Firefox 18 and later support
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vnode.state.videoVisibilityHidden = 'hidden'
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vnode.state.videoVisibilityEvent = 'visibilitychange'
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} else if (typeof document.msHidden !== 'undefined') {
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vnode.state.videoVisibilityHidden = 'msHidden'
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vnode.state.videoVisibilityEvent = 'msvisibilitychange'
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} else if (typeof document.webkitHidden !== 'undefined') {
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vnode.state.videoVisibilityHidden = 'webkitHidden'
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vnode.state.videoVisibilityEvent = 'webkitvisibilitychange'
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}
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if (vnode.state.videoVisibilityHidden && vnode.state.videoVisibilityEvent) {
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vnode.state.videoVisibilityChanged = Helper.visibilityChanged.bind(this, vnode)
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document.addEventListener(vnode.state.videoVisibilityEvent, vnode.state.videoVisibilityChanged, false)
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}
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}
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},
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visibilityChanged: function(vnode) {
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if (document[vnode.state.videoVisibilityHidden]) {
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vnode.state.domVideo.pause()
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} else {
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vnode.state.domVideo.play()
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}
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},
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resizeThrottler: function(vnode) {
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if (vnode.state.videoShow) {
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if (!vnode.state.resizePauseTimeout) {
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vnode.state.domVideo.pause()
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}
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clearTimeout(vnode.state.resizePauseTimeout)
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vnode.state.resizePauseTimeout = setTimeout(function () {
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vnode.state.resizePauseTimeout = null
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requestAnimationFrame(function() {
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Helper.scrollResetBound(vnode)
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vnode.state.domVideo.play()
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})
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}, 250)
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}
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if (!vnode.state.resizeTimeout) {
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vnode.state.resizeTimeout = setTimeout(function () {
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vnode.state.resizeTimeout = null
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Helper.resizeHandler(vnode)
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}, 66)
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}
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},
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resizeHandler: function(vnode) {
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var height = Helper.getHeight(vnode)
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var width = document.documentElement.clientWidth
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Helper.scaleContainer(vnode, height)
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Helper.scaleContainerContent(vnode, 'domImg', true, width, height)
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Helper.scaleContainerContent(vnode, 'domVideo', false, width, height)
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},
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lazyLoadImage: function(vnode, name, url) {
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if (!vnode.state[name]) return
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var img = document.createElement('img')
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img.onload = function() {
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vnode.state[name].src = url
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}
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img.src = url
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},
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scaleContainer: function(vnode, height) {
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if (!vnode.state.domContainer) return
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vnode.state.domContainer.setAttribute('style', 'height: ' + height + 'px;')
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},
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scaleContainerContent: function(vnode, name, forceHeight, width, height) {
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if (!vnode.state[name]) return
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var videoRatio = 0.5625
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var windowRatio = height / width
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if (windowRatio > videoRatio) {
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var videoWidth = height / videoRatio
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var marginFromLeft = -(videoWidth - width) / 2 + 'px'
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vnode.state[name].setAttribute('style',
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'margin-top: 0; margin-left: ' + marginFromLeft + ';' +
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'width: ' + videoWidth + 'px; height: ' + height + 'px')
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} else {
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if (forceHeight) {
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vnode.state[name].setAttribute('style',
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'width: ' + width + 'px; height: ' + height + 'px')
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} else {
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vnode.state[name].setAttribute('style',
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'width: ' + width + 'px;')
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}
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}
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},
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getHeight: function(vnode) {
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var height = document.documentElement.clientHeight + 5
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if (height < 485) {
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height = 485
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} else {
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height = height * vnode.state.videoResizeRatio
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}
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return height
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},
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}
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window.helper = Helper
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module.exports = Helper
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