pinafore/routes/_components/virtualList/VirtualListContainer.html

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<slot></slot>
<script>
import { virtualListStore } from './virtualListStore'
import throttle from 'lodash/throttle'
import { isFullscreen, attachFullscreenListener, detachFullscreenListener } from '../../_utils/fullscreen'
import { mark, stop } from '../../_utils/marks'
const SCROLL_EVENT_DELAY = 300
export default {
oncreate() {
mark('onCreate VirtualListContainer')
this.store.setCurrentRealm(this.get('realm'))
let node = document.querySelector(this.get('containerQuery'))
this.setupScroll(node)
this.setupFullscreen()
let scrollTop = this.store.get('scrollTop')
if (scrollTop > 0) {
this.observe('allVisibleItemsHaveHeight', allVisibleItemsHaveHeight => {
console.log('allVisibleItemsHaveHeight', allVisibleItemsHaveHeight)
if (!this.get('initializedScrollTop') && allVisibleItemsHaveHeight && node) {
this.set({'initializedScrollTop': true})
requestAnimationFrame(() => {
mark('set scrollTop')
console.log('forcing scroll top to ', scrollTop)
node.scrollTop = scrollTop
stop('set scrollTop')
})
}
})
} else {
requestAnimationFrame(() => {
this.store.setForRealm({
scrollHeight: node.scrollHeight,
offsetHeight: node.offsetHeight
})
})
}
stop('onCreate VirtualListContainer')
},
ondestroy() {
this.teardownScroll()
this.teardownFullscreen()
this.store.setCurrentRealm(null)
},
store: () => virtualListStore,
methods: {
setupScroll(node) {
if (!node) {
return
}
this.scrollListener = throttle(event => {
if (this.get('fullscreen')) {
return
}
this.onScroll(event)
}, SCROLL_EVENT_DELAY, {
leading: true,
trailing: true
})
node.addEventListener('scroll', this.scrollListener)
},
teardownScroll() {
let node = document.querySelector(this.get('containerQuery'))
if (node) {
node.removeEventListener('scroll', this.scrollListener)
}
},
setupFullscreen() {
this.onFullscreenChange = this.onFullscreenChange.bind(this)
attachFullscreenListener(this.onFullscreenChange)
},
teardownFullscreen() {
detachFullscreenListener(this.onFullscreenChange)
},
onScroll(event) {
let { scrollTop, scrollHeight } = event.target
requestAnimationFrame(() => { // delay slightly to improve scroll perf
mark('onScroll -> setForRealm()')
this.store.setForRealm({scrollTop, scrollHeight})
stop('onScroll -> setForRealm()')
})
},
onFullscreenChange() {
mark('onFullscreenChange')
console.log('is fullscreen? ', isFullscreen())
this.set({ fullscreen: isFullscreen() })
stop('onFullscreenChange')
}
},
computed: {
// TODO: bug in svelte/store the observer in oncreate() never get removed without this hack
allVisibleItemsHaveHeight: ($allVisibleItemsHaveHeight) => $allVisibleItemsHaveHeight
}
};
</script>