Pinafore-Web-Client-Frontend/routes/_components/virtualList/VirtualListItem.html

47 lines
1.3 KiB
HTML
Raw Normal View History

<div class="virtual-list-item {{shown ? 'shown' : ''}}"
virtual-list-key="{{key}}"
2018-01-15 19:54:02 +01:00
ref:node
2018-01-21 19:32:18 +01:00
style="transform: translateY({{offset}}px);" >
<:Component {component}
virtualProps="{{props}}"
virtualIndex="{{index}}"
virtualLength="{{$numItems}}"
2018-01-21 19:32:18 +01:00
on:recalculateHeight="doRecalculateHeight()"/>
2018-01-15 19:54:02 +01:00
</div>
<style>
.virtual-list-item {
position: absolute;
top: 0;
opacity: 0;
pointer-events: none;
}
.virtual-list-item.shown {
opacity: 1;
pointer-events: auto;
2018-01-15 19:54:02 +01:00
}
</style>
<script>
2018-01-25 17:23:14 +01:00
import { virtualListStore } from './virtualListStore'
import { AsyncLayout } from '../../_utils/AsyncLayout'
2018-01-15 19:54:02 +01:00
export default {
oncreate() {
2018-01-27 18:53:14 +01:00
this.doRecalculateHeight()
2018-01-15 19:54:02 +01:00
},
store: () => virtualListStore,
computed: {
'shown': ($itemHeights, key) => $itemHeights[key] > 0
2018-01-21 19:32:18 +01:00
},
methods: {
doRecalculateHeight() {
2018-01-27 18:53:14 +01:00
let asyncLayout = new AsyncLayout(node => node.getAttribute('virtual-list-key'))
2018-01-21 19:32:18 +01:00
let key = this.get('key')
2018-01-27 18:53:14 +01:00
asyncLayout.observe(key, this.refs.node, (rect) => {
asyncLayout.disconnect()
2018-01-27 18:53:33 +01:00
// update all item heights in one batch for better perf
2018-01-21 19:32:18 +01:00
this.store.batchUpdate('itemHeights', key, rect.height)
})
}
}
2018-01-15 19:54:02 +01:00
}
</script>