86 lines
2.7 KiB
JavaScript
86 lines
2.7 KiB
JavaScript
import React, { useState } from 'react';
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import ReactFlow, { removeElements, addEdge, isNode, Background } from 'react-flow-renderer';
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const onNodeDragStop = (event, node) => console.log('drag stop', node);
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const onElementClick = (event, element) => console.log('click', element);
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const initialElements = [
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{ id: '1', type: 'input', data: { label: 'Node 1' }, position: { x: 250, y: 5 }, className: 'light' },
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{ id: '2', data: { label: 'Node 2' }, position: { x: 100, y: 100 }, className: 'light' },
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{ id: '3', data: { label: 'Node 3' }, position: { x: 400, y: 100 }, className: 'light' },
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{ id: '4', data: { label: 'Node 4' }, position: { x: 400, y: 200 }, className: 'light' },
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{ id: 'e1-2', source: '1', target: '2', animated: true },
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{ id: 'e1-3', source: '1', target: '3' },
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];
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const BasicFlow = () => {
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const [rfInstance, setRfInstance] = useState(null);
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const [elements, setElements] = useState(initialElements);
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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 onLoad = (reactFlowInstance) => setRfInstance(reactFlowInstance);
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const updatePos = () => {
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setElements((elms) => {
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return elms.map((el) => {
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if (isNode(el)) {
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el.position = {
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x: Math.random() * 400,
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y: Math.random() * 400,
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};
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}
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return el;
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});
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});
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};
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const logToObject = () => console.log(rfInstance.toObject());
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const resetTransform = () => rfInstance.setTransform({ x: 0, y: 0, zoom: 1 });
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const toggleClassnames = () => {
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setElements((elms) => {
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return elms.map((el) => {
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if (isNode(el)) {
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el.className = el.className === 'light' ? 'dark' : 'light';
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}
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return el;
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});
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});
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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={onConnect}
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onNodeDragStop={onNodeDragStop}
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className="react-flow-basic-example"
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defaultZoom={1.5}
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minZoom={0.2}
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maxZoom={4}
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>
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<Background variant="lines" />
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<div style={{ position: 'absolute', right: 10, top: 10, zIndex: 4 }}>
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<button onClick={resetTransform} style={{ marginRight: 5 }}>
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reset transform
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</button>
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<button onClick={updatePos} style={{ marginRight: 5 }}>
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change pos
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</button>
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<button onClick={toggleClassnames} style={{ marginRight: 5 }}>
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toggle classnames
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</button>
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<button onClick={logToObject}>toObject</button>
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</div>
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</ReactFlow>
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);
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};
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export default BasicFlow;
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