pinafore/routes/_components/Layout.html

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<:Window bind: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>
<slot></slot>
</main>
</div>
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<script>
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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import { mark, stop } from '../_utils/marks'
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const SCROLL_EVENT_DELAY = 300
const RESIZE_EVENT_DELAY = 700
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export default {
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oncreate() {
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mark('onCreate Layout')
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let node = this.refs.node
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this.observe('innerHeight', debounce(() => {
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// respond to window resize events
this.store.set({
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offsetHeight: 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: node.scrollTop,
scrollHeight: node.scrollHeight,
offsetHeight: node.offsetHeight
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})
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stop('onCreate Layout')
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},
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components: {
Nav
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},
store: () => virtualListStore,
events: {
scroll(node, callback) {
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const onScroll = throttle(event => {
mark('onScroll')
callback(event)
stop('onScroll')
}, SCROLL_EVENT_DELAY, {
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leading: true,
trailing: true
})
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node.addEventListener('scroll', onScroll);
return {
teardown() {
node.removeEventListener('scroll', onScroll);
}
};
}
},
methods: {
onScroll(event) {
this.store.set({
scrollTop: event.target.scrollTop,
scrollHeight: event.target.scrollHeight
})
}
}
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};
</script>