120 lines
3.9 KiB
HTML
120 lines
3.9 KiB
HTML
<div class="container"
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on:scroll="onScroll(event)"
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on:fullscreen="onFullscreenChange()"
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ref:node>
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<slot></slot>
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</div>
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<script>
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import { virtualListStore } from './virtualListStore'
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import throttle from 'lodash/throttle'
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import { isFullscreen, attachFullscreenListener, detachFullscreenListener } from '../../_utils/fullscreen'
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import { mark, stop } from '../../_utils/marks'
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const SCROLL_EVENT_DELAY = 300
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export default {
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oncreate() {
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mark('onCreate VirtualListContainer')
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let node = this.refs.node
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let realm = this.get('realm')
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this.store.set({currentRealm: realm})
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this.observe('scrollToItem', scrollToItem => {
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if (scrollToItem && node && !this.store.get('containerTop')) {
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// have to calculate difference between container and virtual list tops in order to scroll
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this.store.set({containerTop: node.getBoundingClientRect().top})
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}
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})
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let scrollTop = this.store.get('scrollTop')
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if (scrollTop > 0) {
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this.observe('allVisibleItemsHaveHeight', allVisibleItemsHaveHeight => {
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console.log('allVisibleItemsHaveHeight', allVisibleItemsHaveHeight)
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if (!this.get('initializedScrollTop') && allVisibleItemsHaveHeight && node) {
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this.set({'initializedScrollTop': true})
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requestAnimationFrame(() => {
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mark('set scrollTop')
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console.log('forcing scrollTop to ', scrollTop)
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node.scrollTop = scrollTop
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stop('set scrollTop')
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})
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}
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})
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} else {
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this.store.setForRealm({
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scrollHeight: node.scrollHeight,
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offsetHeight: node.offsetHeight
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})
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this.observe('scrollToItemOffset', scrollToItemOffset => {
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console.log('scrollToItemOffset', scrollToItemOffset)
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if (!this.get('initializedScrollTop') && scrollToItemOffset && node) {
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this.set({'initializedScrollTop': true})
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requestAnimationFrame(() => {
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mark('set scrollToItemOffset')
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console.log('forcing scrollItemOffset to ', scrollToItemOffset)
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node.scrollTop = scrollToItemOffset
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stop('set scrollToItemOffset')
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})
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}
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})
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}
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stop('onCreate VirtualListContainer')
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},
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store: () => virtualListStore,
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events: {
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scroll(node, callback) {
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const onScroll = throttle(event => {
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mark('onScroll')
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if (this.get('fullscreen')) {
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return
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}
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callback(event)
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stop('onScroll')
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}, SCROLL_EVENT_DELAY, {
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leading: true,
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trailing: true
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})
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node.addEventListener('scroll', onScroll)
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return {
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teardown() {
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node.removeEventListener('scroll', onScroll)
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}
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}
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},
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fullscreen(node, callback) {
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const onFullscreen = (() => {
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callback()
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})
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attachFullscreenListener(onFullscreen)
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return {
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teardown() {
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detachFullscreenListener(onFullscreen)
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}
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}
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}
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},
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methods: {
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onScroll(event) {
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console.log('onScroll', event.target.scrollTop)
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this.store.setForRealm({
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scrollTop: event.target.scrollTop,
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scrollHeight: event.target.scrollHeight
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})
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},
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onFullscreenChange() {
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mark('onFullscreenChange')
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console.log('is fullscreen? ', isFullscreen())
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this.set({ fullscreen: isFullscreen() })
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stop('onFullscreenChange')
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}
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},
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computed: {
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// TODO: bug in svelte/store – the observer in oncreate() never get removed without this hack
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allVisibleItemsHaveHeight: ($allVisibleItemsHaveHeight) => $allVisibleItemsHaveHeight,
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scrollToItemOffset: ($scrollToItemOffset) => $scrollToItemOffset,
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scrollToItem: ($scrollToItem) => $scrollToItem
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}
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};
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</script> |