104 lines
3.4 KiB
HTML
104 lines
3.4 KiB
HTML
<div class="virtual-list {{shown ? '' : 'hidden'}}" style="height: {{$height}}px;">
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<VirtualListHeader component="{{headerComponent}}" virtualProps="{{headerProps}}" shown="{{$showHeader}}"/>
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{{#if $visibleItems}}
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{{#each $visibleItems as visibleItem @key}}
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<VirtualListLazyItem :component
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offset="{{visibleItem.offset}}"
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makeProps="{{makeProps}}"
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key="{{visibleItem.key}}"
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index="{{visibleItem.index}}"
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/>
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{{/each}}
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{{/if}}
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{{#if $showFooter}}
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<VirtualListFooter component="{{footerComponent}}"/>
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{{/if}}
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</div>
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<style>
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.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 VirtualListLazyItem from './VirtualListLazyItem'
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import VirtualListFooter from './VirtualListFooter.html'
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import VirtualListHeader from './VirtualListHeader.html'
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import { virtualListStore } from './virtualListStore'
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import throttle from 'lodash/throttle'
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import { mark, stop } from '../../_utils/marks'
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const DISTANCE_FROM_BOTTOM_TO_FIRE = 400
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const SCROLL_EVENT_THROTTLE = 1000
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export default {
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oncreate () {
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this.fireScrollToBottom = throttle(() => {
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this.fire('scrollToBottom')
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}, SCROLL_EVENT_THROTTLE)
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this.fireScrollToTop = throttle(() => {
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this.fire('scrollToTop')
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}, SCROLL_EVENT_THROTTLE)
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this.observe('showFooter', showFooter => {
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mark('set showFooter')
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this.store.setForRealm({showFooter: showFooter})
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mark('set showFooter')
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})
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this.observe('showHeader', showHeader => {
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mark('set showHeader')
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this.store.setForRealm({showHeader: showHeader})
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stop('set showHeader')
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})
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this.observe('itemsStringified', (itemsStringified) => {
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let items = typeof itemsStringified === 'undefined' ? undefined :
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JSON.parse(itemsStringified)
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mark('set items')
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this.store.setForRealm({items: items})
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stop('set items')
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})
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this.observe('allVisibleItemsHaveHeight', allVisibleItemsHaveHeight => {
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if (allVisibleItemsHaveHeight) {
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this.fire('initializedVisibleItems')
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}
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})
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let observedOnce = false
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this.observe('distanceFromBottom', (distanceFromBottom) => {
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if (!observedOnce) {
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observedOnce = true // TODO: the first time is always 0... need better way to handle this
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return
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}
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if (distanceFromBottom >= 0 &&
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distanceFromBottom <= DISTANCE_FROM_BOTTOM_TO_FIRE) {
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this.fireScrollToBottom()
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}
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})
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this.observe('distanceFromTop', (distanceFromTop) => {
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if (distanceFromTop === 0) {
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this.fireScrollToTop()
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}
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})
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},
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data: () => ({
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component: null
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}),
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store: () => virtualListStore,
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components: {
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VirtualListLazyItem,
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VirtualListFooter,
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VirtualListHeader
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},
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computed: {
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distanceFromBottom: ($scrollHeight, $scrollTop, $offsetHeight) => {
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return $scrollHeight - $scrollTop - $offsetHeight
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},
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distanceFromTop: ($scrollTop) => $scrollTop,
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// TODO: bug in svelte store, shouldn't need to do this
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allVisibleItemsHaveHeight: ($allVisibleItemsHaveHeight) => $allVisibleItemsHaveHeight,
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// hack to avoid getting called too often
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itemsStringified: (items) => JSON.stringify(items)
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}
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}
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</script> |