45 lines
1.4 KiB
TypeScript
45 lines
1.4 KiB
TypeScript
import { derived } from 'svelte/store';
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import { areConnectionMapsEqual, type HandleConnection, type HandleType } from '@xyflow/system';
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import { useStore } from '$lib/store';
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import { getContext } from 'svelte';
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export type useHandleConnectionsParams = {
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type: HandleType;
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nodeId?: string;
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id?: string | null;
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};
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const initialConnections: HandleConnection[] = [];
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/**
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* Hook to check if a <Handle /> is connected to another <Handle /> and get the connections.
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*
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* @public
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* @param param.nodeId
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* @param param.type - handle type 'source' or 'target'
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* @param param.id - the handle id (this is only needed if the node has multiple handles of the same type)
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* @returns an array with connections
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*/
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export function useHandleConnections({ type, nodeId, id = null }: useHandleConnectionsParams) {
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const { edges, connectionLookup } = useStore();
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const _nodeId = getContext<string>('svelteflow__node_id');
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const currentNodeId = nodeId ?? _nodeId;
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let prevConnections: Map<string, HandleConnection> | undefined = undefined;
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return derived(
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[edges, connectionLookup],
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([, connectionLookup], set) => {
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const nextConnections = connectionLookup.get(`${currentNodeId}-${type}-${id || null}`);
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if (!areConnectionMapsEqual(nextConnections, prevConnections)) {
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prevConnections = nextConnections;
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set(Array.from(prevConnections?.values() || []));
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}
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},
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initialConnections
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);
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}
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