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<script lang="ts">
import { writable, derived } from 'svelte/store';
import {
SvelteFlow,
Controls,
Background,
MiniMap,
MarkerType,
Position,
useSvelteFlow,
type XYPosition,
type Node,
type Edge,
} from '@xyflow/svelte';
import NodeWithParams from './NodeWithParams.svelte';
import NodeWithGraphVisualization from './NodeWithGraphVisualization.svelte';
import NodeSearch from './NodeSearch.svelte';
import '@xyflow/svelte/dist/style.css';
const { screenToFlowPosition } = useSvelteFlow();
const nodeTypes: NodeTypes = {
basic: NodeWithParams,
graphviz: NodeWithGraphVisualization,
};
const nodes = writable<Node[]>([
{
id: '1',
type: 'basic',
data: { title: 'Compute PageRank', params: { damping: 0.85, iterations: 3 } },
position: { x: 0, y: 0 },
sourcePosition: Position.Right,
targetPosition: Position.Left,
},
{
id: '3',
type: 'basic',
data: { title: 'Import Parquet', params: { filename: '/tmp/x.parquet' } },
position: { x: -300, y: 0 },
sourcePosition: Position.Right,
},
{
id: '4',
type: 'graphviz',
data: { title: 'Visualize graph', params: {} },
position: { x: 300, y: 0 },
targetPosition: Position.Left,
},
]);
const edges = writable<Edge[]>([
{
id: '3-1',
source: '3',
target: '1',
markerEnd: {
type: MarkerType.ArrowClosed,
},
},
{
id: '3-4',
source: '1',
target: '4',
markerEnd: {
type: MarkerType.ArrowClosed,
},
},
]);
function closeNodeSearch() {
nodeSearchPos = undefined;
}
function toggleNodeSearch({ detail: { event } }) {
if (nodeSearchPos) {
closeNodeSearch();
return;
}
event.preventDefault();
const width = 500;
const height = 200;
nodeSearchPos = {
top: event.clientY < height - 200 ? event.clientY : undefined,
left: event.clientX < width - 200 ? event.clientX : undefined,
right: event.clientX >= width - 200 ? width - event.clientX : undefined,
bottom: event.clientY >= height - 200 ? height - event.clientY : undefined
};
nodeSearchPos = {
top: event.clientY,
left: event.clientX - 150,
};
}
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 = [
{
type: 'basic',
data: { title: 'Import Parquet', params: { filename: '/tmp/x.parquet' } },
sourcePosition: Position.Right,
},
{
type: 'basic',
data: { title: 'Export Parquet', params: { filename: '/tmp/x.parquet' } },
targetPosition: Position.Left,
},
{
type: 'graphviz',
data: { title: 'Visualize graph', params: {} },
targetPosition: Position.Left,
},
{
type: 'basic',
data: { title: 'Compute PageRank', params: { damping: 0.85, iterations: 3 } },
sourcePosition: Position.Right,
targetPosition: Position.Left,
},
];
let nodeSearchPos: XYPosition | undefined = undefined;
const graph = derived([nodes, edges], ([nodes, edges]) => ({ nodes, edges }));
let backendWorkspace;
graph.subscribe(async (g) => {
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 = JSON.stringify(g);
if (ws === backendWorkspace) return;
backendWorkspace = ws;
const res = await fetch('/api/save', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify(g),
});
const j = await res.json();
g.nodes[2].data.graph = j.graph;
backendWorkspace = JSON.stringify(g);
nodes.set(g.nodes);
});
</script>
<div style:height="100vh">
<SvelteFlow {nodes} {edges} {nodeTypes} fitView
on:paneclick={toggleNodeSearch}
proOptions={{ hideAttribution: true }}
maxZoom={1.5}
minZoom={0.3}
>
<Background />
<Controls />
<Background />
<MiniMap />
{#if nodeSearchPos}<NodeSearch boxes={boxes} on:cancel={closeNodeSearch} on:add={addNode} pos={nodeSearchPos} />{/if}
</SvelteFlow>
</div>
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