pinafore/routes/_components/VirtualListItem.html

42 lines
1.1 KiB
HTML
Raw Normal View History

2018-01-15 18:54:02 +00:00
<div class="virtual-list-item"
ref:node
2018-01-16 00:12:07 +00:00
style="transform: translate3d(0, {{offset}}px, 0);"
>
<:Component {component} virtualProps="{{props}}" />
2018-01-15 18:54:02 +00:00
</div>
<style>
.virtual-list-item {
position: absolute;
top: 0;
}
</style>
<script>
import { virtualListStore } from '../_utils/virtualListStore'
2018-01-17 02:08:37 +00:00
let updateItemHeights = {}
let promise = Promise.resolve()
2018-01-15 18:54:02 +00:00
export default {
oncreate() {
2018-01-16 00:35:08 +00:00
let key = this.get('key')
2018-01-17 02:08:37 +00:00
updateItemHeights[key] = this.refs.node.offsetHeight
promise.then(() => {
// update all item heights in one microtask batch for better perf
let updatedKeys = Object.keys(updateItemHeights)
if (!updatedKeys.length) {
return
}
// batch all updates to itemHeights for better perf
let itemHeights = this.store.get('itemHeights')
for (key of updatedKeys) {
itemHeights[key] = updateItemHeights[key]
}
this.store.set({
itemHeights: itemHeights
})
updateItemHeights = {}
2018-01-16 00:35:08 +00:00
})
2018-01-15 18:54:02 +00:00
},
store: () => virtualListStore
2018-01-15 18:54:02 +00:00
}
</script>