158 lines
4.0 KiB
JavaScript
158 lines
4.0 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 onNodeDragStart = (node) => console.log('drag start', node);
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const onNodeDragStop = (node) => console.log('drag stop', node);
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const onElementClick = (element) => console.log('click', element);
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const onSelectionChange = (elements) => console.log('selection change', elements);
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const onLoad = (reactFlowInstance) => {
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console.log('flow loaded:', reactFlowInstance);
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reactFlowInstance.fitView();
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};
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const initialElements = [
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{
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id: '1',
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type: 'input',
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data: {
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label: (
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<>
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Welcome to <strong>React Flow!</strong>
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</>
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),
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},
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position: { x: 250, y: 0 },
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},
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{
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id: '2',
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data: {
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label: (
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<>
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This is a <strong>default node</strong>
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</>
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),
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},
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position: { x: 100, y: 100 },
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},
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{
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id: '3',
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data: {
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label: (
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<>
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This one has a <strong>custom style</strong>
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</>
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),
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},
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position: { x: 400, y: 100 },
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style: { background: '#eee', color: '#222', border: '1px solid #bbb', width: 180 },
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},
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{
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id: '4',
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position: { x: 250, y: 200 },
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data: {
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label: (
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<>
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You can find the docs on{' '}
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<a href="https://github.com/wbkd/react-flow" target="_blank" rel="noopener noreferrer">
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Github
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</a>
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</>
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),
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},
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},
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{
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id: '5',
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data: {
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label: (
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<>
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Or check out the other <strong>examples</strong>
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</>
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),
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},
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position: { x: 250, y: 325 },
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},
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{
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id: '6',
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type: 'output',
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data: {
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label: (
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<>
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An <strong>output node</strong>
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</>
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),
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},
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position: { x: 100, y: 480 },
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},
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{ id: '7', type: 'output', data: { label: 'Another output node' }, position: { x: 400, y: 450 } },
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{ id: 'e1-2', source: '1', target: '2', label: 'this is an edge label' },
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{ id: 'e1-3', source: '1', target: '3' },
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{ id: 'e3-4', source: '3', target: '4', animated: true, label: 'animated edge' },
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{ id: 'e4-5', source: '4', target: '5', arrowHeadType: 'arrowclosed', label: 'edge with arrow head' },
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{ id: 'e5-6', source: '5', target: '6', type: 'smoothstep', label: 'smooth step edge' },
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{
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id: 'e5-7',
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source: '5',
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target: '7',
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type: 'step',
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label: 'a step edge',
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labelStyle: { fill: 'red', fontWeight: 700 },
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},
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];
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const OverviewFlow = () => {
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const [elements, setElements] = useState(initialElements);
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const addRandomNode = () => {
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setElements((els) =>
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els.concat({
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id: (els.length + 1).toString(),
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data: { label: 'Added node' },
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position: { x: Math.random() * window.innerWidth, y: Math.random() * window.innerHeight },
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})
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);
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};
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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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return (
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<ReactFlow
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elements={elements}
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onElementClick={onElementClick}
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onElementsRemove={onElementsRemove}
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onConnect={onConnect}
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onNodeDragStart={onNodeDragStart}
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onNodeDragStop={onNodeDragStop}
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onSelectionChange={onSelectionChange}
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style={{ width: '100%', height: '100%' }}
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onLoad={onLoad}
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connectionLineStyle={{ stroke: '#ddd', strokeWidth: 2 }}
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snapToGrid={true}
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snapGrid={[16, 16]}
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>
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<MiniMap
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nodeColor={(n) => {
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if (n.type === 'input') return 'blue';
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if (n.type === 'output') return 'green';
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if (n.type === 'default') return 'red';
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return '#FFCC00';
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}}
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/>
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<Controls />
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<Background color="#888" gap={16} />
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<button
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type="button"
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onClick={addRandomNode}
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style={{ position: 'absolute', right: 10, top: 30, zIndex: 4 }}
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className="overview-example__add"
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>
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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 OverviewFlow;
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