44 lines
1.4 KiB
JavaScript
44 lines
1.4 KiB
JavaScript
import React, { useState } from 'react';
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import ReactFlow, { removeElements, addEdge, MiniMap, Controls, Background } from 'react-flow-renderer';
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const onLoad = (reactFlowInstance) => console.log('flow loaded:', reactFlowInstance);
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const onElementClick = (event, element) => console.log('click', element);
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const onNodeDragStop = (event, node) => console.log('drag stop', node);
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const EmptyFlow = () => {
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const [elements, setElements] = useState([]);
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const onElementsRemove = (elementsToRemove) => setElements((els) => removeElements(elementsToRemove, els));
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const onConnect = (params) => setElements((els) => addEdge(params, els));
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const addRandomNode = () => {
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const nodeId = (elements.length + 1).toString();
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const newNode = {
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id: nodeId,
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data: { label: `Node: ${nodeId}` },
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position: { x: Math.random() * window.innerWidth, y: Math.random() * window.innerHeight },
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};
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setElements((els) => els.concat(newNode));
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};
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return (
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<ReactFlow
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elements={elements}
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onLoad={onLoad}
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onElementClick={onElementClick}
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onElementsRemove={onElementsRemove}
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onConnect={(p) => onConnect(p)}
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onNodeDragStop={onNodeDragStop}
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>
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<MiniMap />
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<Controls />
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<Background variant="lines" />
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<button type="button" onClick={addRandomNode} style={{ position: 'absolute', left: 10, top: 10, zIndex: 4 }}>
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add node
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</button>
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</ReactFlow>
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);
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};
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export default EmptyFlow;
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