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Feature - Implemented virtual scroll on web (#573)

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This PR implemented a virtual scroll on the web, as seen in this article.

[Building the Google Photos Web UI](https://medium.com/google-design/google-photos-45b714dfbed1)
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Alex 2022-09-04 08:34:39 -05:00 • committed by GitHub
parent bd92dde117
commit 552340add7
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GPG key ID: 4AEE18F83AFDEB23
58 changed files with 2197 additions and 698 deletions
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17
web/src/lib/components/asset-viewer/intersection-observer.svelte
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@ -1,28 +1,39 @@
<script lang="ts">
import { onMount } from 'svelte';
import { createEventDispatcher } from 'svelte';
export let once = false;
export let top = 0;
export let bottom = 0;
export let left = 0;
export let right = 0;
export let root: HTMLElement | null = null;
let intersecting = false;
let container: any;
const dispatch = createEventDispatcher();
onMount(() => {
if (typeof IntersectionObserver !== 'undefined') {
const rootMargin = `${bottom}px ${left}px ${top}px ${right}px`;
const rootMargin = `${top}px ${right}px ${bottom}px ${left}px`;
const observer = new IntersectionObserver(
(entries) => {
intersecting = entries[0].isIntersecting;
if (!intersecting) {
dispatch('hidden', container);
}
if (intersecting && once) {
observer.unobserve(container);
}
if (intersecting) {
dispatch('intersected', container);
}
},
{
rootMargin
rootMargin,
root
}
);