forked from cybrespace/pinafore
61 lines
1.4 KiB
HTML
61 lines
1.4 KiB
HTML
<:Window bind:innerHeight='innerHeight'/>
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<Nav page={{page}} />
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<div class="container" on:scroll="onScroll(event)" ref:node>
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<main>
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<slot></slot>
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</main>
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</div>
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<script>
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import Nav from './Nav.html';
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import { virtualListStore } from '../_utils/virtualListStore'
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import debounce from 'lodash/debounce'
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import throttle from 'lodash/throttle'
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const SCROLL_EVENT_DELAY = 300
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const RESIZE_EVENT_DELAY = 700
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export default {
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oncreate() {
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this.observe('innerHeight', debounce(() => {
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// respond to window resize events
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this.store.set({
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offsetHeight: this.refs.node.offsetHeight
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})
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}, RESIZE_EVENT_DELAY))
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this.store.set({
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scrollTop: this.refs.node.scrollTop,
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scrollHeight: this.refs.node.scrollHeight,
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offsetHeight: this.refs.node.offsetHeight
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})
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},
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components: {
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Nav
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},
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store: () => virtualListStore,
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events: {
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scroll(node, callback) {
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const onScroll = throttle(callback, SCROLL_EVENT_DELAY, {
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leading: true,
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trailing: true
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})
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node.addEventListener('scroll', onScroll);
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return {
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teardown() {
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node.removeEventListener('scroll', onScroll);
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}
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};
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}
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},
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methods: {
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onScroll(event) {
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this.store.set({
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scrollTop: event.target.scrollTop,
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scrollHeight: event.target.scrollHeight
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})
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}
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}
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};
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</script> |