forked from cybrespace/pinafore
66 lines
2.0 KiB
HTML
66 lines
2.0 KiB
HTML
<div class="virtual-list-item {shown ? 'shown' : ''}"
|
|
aria-hidden={!shown}
|
|
virtual-list-key={key}
|
|
ref:node
|
|
style="transform: translateY({offset}px);" >
|
|
<svelte:component this={component}
|
|
virtualProps={props}
|
|
virtualIndex={index}
|
|
virtualLength={$length}
|
|
on:recalculateHeight="doRecalculateHeight()"/>
|
|
</div>
|
|
<style>
|
|
.virtual-list-item {
|
|
position: absolute;
|
|
top: 0;
|
|
opacity: 0;
|
|
pointer-events: none;
|
|
transition: opacity 0.333s linear;
|
|
}
|
|
.virtual-list-item.shown {
|
|
opacity: 1;
|
|
pointer-events: auto;
|
|
}
|
|
</style>
|
|
<script>
|
|
import { virtualListStore } from './virtualListStore'
|
|
import { registerResizeListener, unregisterResizeListener } from '../../_utils/resize'
|
|
import { mark, stop } from '../../_utils/marks'
|
|
|
|
export default {
|
|
oncreate () {
|
|
let { key } = this.get()
|
|
let node = this.refs.node
|
|
requestAnimationFrame(() => {
|
|
if (!node || !key) {
|
|
return
|
|
}
|
|
mark('VirtualListItem gBCR')
|
|
let rect = node.getBoundingClientRect()
|
|
stop('VirtualListItem gBCR')
|
|
// update all item heights in one batch for better perf
|
|
this.store.batchUpdateForRealm('itemHeights', key, rect.height)
|
|
})
|
|
this.doRecalculateHeight = this.doRecalculateHeight.bind(this)
|
|
registerResizeListener(this.doRecalculateHeight)
|
|
},
|
|
ondestroy () {
|
|
unregisterResizeListener(this.doRecalculateHeight)
|
|
},
|
|
store: () => virtualListStore,
|
|
computed: {
|
|
'shown': ({ $itemHeights, key }) => $itemHeights[key] > 0
|
|
},
|
|
methods: {
|
|
doRecalculateHeight () {
|
|
// Recalculate immediately because this is done on-demand, e.g.
|
|
// when clicking the "More" button on a spoiler.
|
|
let rect = this.refs.node.getBoundingClientRect()
|
|
let { key } = this.get()
|
|
let { itemHeights } = this.store.get()
|
|
itemHeights[key] = rect.height
|
|
this.store.setForRealm({itemHeights})
|
|
}
|
|
}
|
|
}
|
|
</script> |