Rust implementation of NextGraph, a Decentralized and local-first web 3.0 ecosystem
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nextgraph-rs/ng-app/src/apps/ProseMirrorViewer.svelte

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<!--
// Copyright (c) 2022-2025 Niko Bonnieure, Par le Peuple, NextGraph.org developers
// All rights reserved.
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE2 or http://www.apache.org/licenses/LICENSE-2.0>
// or the MIT license <LICENSE-MIT or http://opensource.org/licenses/MIT>,
// at your option. All files in the project carrying such
// notice may not be copied, modified, or distributed except
// according to those terms.
-->
<script lang="ts">
import { onMount, tick, onDestroy } from "svelte";
import {
sparql_update,
toast_error,
toast_success
} from "../store";
import {
set_view_or_edit, cur_tab_doc_can_edit
} from "../tab";
import{ PencilSquare, RocketLaunch } from "svelte-heros-v2";
import { t } from "svelte-i18n";
import * as Y from 'yjs'
import { yXmlFragmentToProseMirrorRootNode } from 'y-prosemirror';
import { richTextSchema } from 'prosemirror-svelte/state';
import { DOMSerializer } from "prosemirror-model";
export let commits = {};
let source = "";
const ydoc = new Y.Doc()
const yxml = ydoc.getXmlFragment('prosemirror')
let loading = true;
ydoc.on('destroy', async () => {
commits.discrete?.deregisterOnUpdate();
})
const toHTML = () => {
const serializer = DOMSerializer.fromSchema(richTextSchema);
const fragment = serializer.serializeFragment(yXmlFragmentToProseMirrorRootNode(yxml, richTextSchema));
const node = document.createElement('div');
node.append(fragment);
return node.innerHTML;
}
onMount(()=>{
let history = commits.discrete?.registerOnUpdate((update) => {
Y.applyUpdate(ydoc, update.YXml, {local:true})
source = toHTML()
});
for (const h of history) {
Y.applyUpdate(ydoc, h.YXml, {local:true})
}
source = toHTML();
loading = false;
});
onDestroy(()=>{
ydoc.destroy();
});
const edit = () => {
set_view_or_edit(false);
}
</script>
<div class="grow p-5">
{#if loading}
<div class="grow flex flex-col justify-center text-primary-700">
<svg
class="animate-spin mt-4 h-10 w-10 mb-4 mx-auto"
xmlns="http://www.w3.org/2000/svg"
fill="none"
stroke="currentColor"
viewBox="0 0 24 24"
>
<circle
class="opacity-25"
cx="12"
cy="12"
r="10"
stroke="currentColor"
stroke-width="4"
/>
<path
class="opacity-75"
fill="currentColor"
d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
/>
</svg>
<p class="text-center">{$t("connectivity.loading")}...</p>
</div>
{/if}
{#if source}
<div class="post-rich-text prose" style="margin-top: 1.25em;">
{@html source}
</div>
{:else if $cur_tab_doc_can_edit}
<button
on:click={edit}
on:keypress={edit}
class="select-none mb-10 text-white bg-primary-700 hover:bg-primary-700/90 focus:ring-4 focus:ring-primary-500/50 rounded-lg text-base p-2 text-center inline-flex items-center dark:focus:ring-primary-700/55"
>
<PencilSquare tabindex="-1" class="mr-2 focus:outline-none" />
{$t("doc.start_editing")}
</button>
{/if}
</div>