65 lines
2 KiB
HTML
65 lines
2 KiB
HTML
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<div class="pseudo-virtual-list {{shown ? '' : 'hidden'}}" on:initializedVisibleItems>
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{{#each wrappedItems as wrappedItem, i @item}}
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<PseudoVirtualListLazyItem
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component="{{component}}"
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index="{{i}}"
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length="{{items.length}}"
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makeProps="{{makeProps}}"
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key="{{wrappedItem.item}}"
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scrollToThisItem="{{wrappedItem.item === scrollToItem}}"
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on:scrollToPosition="onScrollToPosition(event)"
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on:renderedListItem="onRenderedListItem()"
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/>
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{{/each}}
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</div>
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<style>
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.pseudo-virtual-list {
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position: relative;
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transition: opacity 0.25s linear;
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}
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</style>
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<script>
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import PseudoVirtualListLazyItem from './PseudoVirtualListLazyItem.html'
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export default {
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oncreate() {
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this.observe('numRenderedListItems', numRenderedListItems => {
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let items = this.get('items')
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if (items.length && items.length === numRenderedListItems && !this.get('initialized')) {
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this.set({initialized: true})
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console.log('fire initialized')
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this.fire('initializedVisibleItems')
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}
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})
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},
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methods: {
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onScrollToPosition(rect) {
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console.log('onScrollToPosition', rect)
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// TODO: there should be some cleaner way to grab the container element
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let container = document.querySelector('.container')
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if (!container) {
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return
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}
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let containerRect = container.getBoundingClientRect()
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let scrollTop = rect.top - containerRect.top
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if (scrollTop !== 0) {
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requestAnimationFrame(() => {
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console.log('setting scrollTop to ', scrollTop)
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container.scrollTop = scrollTop
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})
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}
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},
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onRenderedListItem() {
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let numRenderedListItems = this.get('numRenderedListItems') || 0
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this.set({numRenderedListItems: numRenderedListItems + 1})
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}
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},
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computed: {
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wrappedItems: (items) => items.map(item => ({item: item}))
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},
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components: {
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PseudoVirtualListLazyItem
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}
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}
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</script>
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