pinafore/routes/_components/virtualList/VirtualListContainer.html

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<div class="container"
on:scroll="onScroll(event)"
on:fullscreen="onFullscreenChange()"
ref:node>
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<slot></slot>
</div>
<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'
import { mark, stop } from '../../_utils/marks'
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const SCROLL_EVENT_DELAY = 300
export default {
oncreate() {
mark('onCreate VirtualListContainer')
let node = this.refs.node
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let realm = this.get('realm')
this.store.set({currentRealm: realm})
let scrollTop = this.store.get('scrollTop')
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) {
this.set({'initializedScrollTop': true})
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requestAnimationFrame(() => {
mark('set scrollTop')
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console.log('forcing scroll top to ', scrollTop)
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node.scrollTop = scrollTop
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stop('set scrollTop')
})
}
})
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} else {
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this.store.setForRealm({
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scrollHeight: node.scrollHeight,
offsetHeight: node.offsetHeight
})
}
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stop('onCreate VirtualListContainer')
},
store: () => virtualListStore,
events: {
scroll(node, callback) {
const onScroll = throttle(event => {
mark('onScroll')
if (this.get('fullscreen')) {
return
}
callback(event)
stop('onScroll')
}, SCROLL_EVENT_DELAY, {
leading: true,
trailing: true
})
node.addEventListener('scroll', onScroll)
return {
teardown() {
node.removeEventListener('scroll', onScroll)
}
}
},
fullscreen(node, callback) {
const onFullscreen = (() => {
callback()
})
attachFullscreenListener(onFullscreen)
return {
teardown() {
detachFullscreenListener(onFullscreen)
}
}
}
},
methods: {
onScroll(event) {
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this.store.setForRealm({
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scrollTop: event.target.scrollTop,
scrollHeight: event.target.scrollHeight
})
},
onFullscreenChange() {
mark('onFullscreenChange')
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console.log('is fullscreen? ', isFullscreen())
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this.set({ fullscreen: isFullscreen() })
stop('onFullscreenChange')
}
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},
computed: {
// TODO: bug in svelte/store the observer in oncreate() never get removed without this hack
allVisibleItemsHaveHeight: ($allVisibleItemsHaveHeight) => $allVisibleItemsHaveHeight
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}
};
</script>