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<script lang="ts">
import { writable, derived } from 'svelte/store';
import {
SvelteFlow,
Controls,
Background,
MiniMap,
MarkerType,
useSvelteFlow,
type XYPosition,
type Node,
type Edge,
type Connection,
type NodeTypes,
} from '@xyflow/svelte';
import NodeWithParams from './NodeWithParams.svelte';
import NodeWithGraphView from './NodeWithGraphView.svelte';
import NodeWithTableView from './NodeWithTableView.svelte';
import NodeSearch from './NodeSearch.svelte';
import '@xyflow/svelte/dist/style.css';
const { screenToFlowPosition } = useSvelteFlow();
const nodeTypes: NodeTypes = {
basic: NodeWithParams,
graph_view: NodeWithGraphView,
table_view: NodeWithTableView,
};
export let path = '';
const nodes = writable<Node[]>([]);
const edges = writable<Edge[]>([]);
let workspaceLoaded = false;
async function fetchWorkspace(path) {
if (!path) return;
const res = await fetch(`/api/load?path=${path}`);
const j = await res.json();
nodes.set(j.nodes);
edges.set(j.edges);
backendWorkspace = orderedJSON(j);
workspaceLoaded = true;
}
$: fetchWorkspace(path);
function closeNodeSearch() {
nodeSearchPos = undefined;
}
function toggleNodeSearch({ detail: { event } }) {
if (nodeSearchPos) {
closeNodeSearch();
return;
}
event.preventDefault();
nodeSearchPos = {
top: event.offsetY,
left: event.offsetX - 155,
};
}
function addNode(e) {
const node = {...e.detail};
nodes.update((n) => {
node.position = screenToFlowPosition({x: nodeSearchPos.left, y: nodeSearchPos.top});
const title = node.data.title;
let i = 1;
node.id = `${title} ${i}`;
while (n.find((x) => x.id === node.id)) {
i += 1;
node.id = `${title} ${i}`;
}
return [...n, node]
});
closeNodeSearch();
}
const boxes = writable([]);
async function getBoxes() {
const res = await fetch('/api/catalog');
const j = await res.json();
boxes.set(j);
}
getBoxes();
let nodeSearchPos: XYPosition | undefined = undefined;
const graph = derived([nodes, edges], ([nodes, edges]) => ({ nodes, edges }));
let backendWorkspace: string;
// Like JSON.stringify, but with keys sorted.
function orderedJSON(obj: any) {
const allKeys = new Set();
JSON.stringify(obj, (key, value) => (allKeys.add(key), value));
return JSON.stringify(obj, Array.from(allKeys).sort());
}
graph.subscribe(async (g) => {
if (!workspaceLoaded) {
return;
}
const dragging = g.nodes.find((n) => n.dragging);
if (dragging) return;
g = JSON.parse(JSON.stringify(g));
for (const node of g.nodes) {
delete node.computed;
}
const ws = orderedJSON(g);
if (ws === backendWorkspace) return;
// console.log('save', '\n' + ws, '\n' + backendWorkspace);
backendWorkspace = ws;
const res = await fetch('/api/save', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify({ path, ws: g }),
});
const j = await res.json();
backendWorkspace = orderedJSON(j);
nodes.set(j.nodes);
});
function onconnect(connection: Connection) {
edges.update((edges) => {
// Only one source can connect to a given target.
return edges.filter((e) => e.source === connection.source || e.target !== connection.target);
});
}
</script>
<div style:height="100%">
<SvelteFlow {nodes} {edges} {nodeTypes} fitView
on:paneclick={toggleNodeSearch}
proOptions={{ hideAttribution: true }}
maxZoom={1.5}
minZoom={0.3}
onconnect={onconnect}
>
<Background patternColor="#39bcf3" />
<Controls />
<MiniMap />
{#if nodeSearchPos}<NodeSearch boxes={$boxes} on:cancel={closeNodeSearch} on:add={addNode} pos={nodeSearchPos} />{/if}
</SvelteFlow>
</div>
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