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import React, { useState } from 'react';
import ReactFlow, { removeElements, addEdge, MiniMap, Controls, Background } from 'react-flow-renderer';
const onNodeDragStart = node => console.log('drag start', node);
const onNodeDragStop = node => console.log('drag stop', node);
const onElementClick = element => console.log('click', element);
const onSelectionChange = elements => console.log('selection change', elements);
const onLoad = (reactFlowInstance) => {
console.log('graph loaded:', reactFlowInstance);
reactFlowInstance.fitView();
};
const initialElements = [
{ id: '1', type: 'input', data: { label: <>Welcome to <strong>React Flow!</strong></> }, position: { x: 250, y: 0 } },
{ id: '2', data: { label: <>This is a <strong>default node</strong></> }, position: { x: 100, y: 100 } },
{
id: '3', data: { label: <>This one has a <strong>custom style</strong></> }, position: { x: 400, y: 100 },
style: { background: '#eee', color: '#222', border: '1px solid #bbb', width: 180 },
},
{
id: '4', position: { x: 250, y: 200 },
data: { label: <>You can find the docs on <a href="https://github.com/wbkd/react-flow" target="_blank" rel="noopener noreferrer">Github</a></> }
},
{ id: '5', data: { label: <>Or check out the other <strong>examples</strong></> }, position: { x: 250, y: 300 } },
{ id: '6', type: 'output', data: { label: <>An <strong>output node</strong></> }, position: { x: 100, y: 450 } },
{ id: '7', type: 'output', data: { label: 'Another output node' }, position: { x: 400, y: 450 } },
{ id: 'e1-2', source: '1', target: '2', label: 'this is an edge label' },
{ id: 'e1-3', source: '1', target: '3' },
{ id: 'e3-4', source: '3', target: '4', animated: true, label: 'animated edge' },
{ id: 'e4-5', source: '4', target: '5', },
{ id: 'e5-6', source: '5', target: '6', },
{ id: 'e5-7', source: '5', target: '7', type: 'step', label: 'a step edge', labelStyle: { fill: 'red', fontWeight: 700 } },
];
const OverviewFlow = () => {
const [elements, setElements] = useState(initialElements);
const addRandomNode = () => {
setElements(els => els.concat({
id: (els.length + 1).toString(),
data: { label: 'Added node' },
position: { x: Math.random() * window.innerWidth, y: Math.random() * window.innerHeight }
}));
};
const onElementsRemove = (elementsToRemove) => setElements(els => removeElements(elementsToRemove, els));
const onConnect = (params) => setElements(els => addEdge(params, els));
return (
<ReactFlow
elements={elements}
onElementClick={onElementClick}
onElementsRemove={onElementsRemove}
onConnect={onConnect}
onNodeDragStart={onNodeDragStart}
onNodeDragStop={onNodeDragStop}
onSelectionChange={onSelectionChange}
style={{ width: '100%', height: '100%' }}
onLoad={onLoad}
connectionLineStyle={{ stroke: '#ddd', strokeWidth: 2 }}
connectionLineType="bezier"
snapToGrid={true}
snapGrid={[16, 16]}
>
<MiniMap
nodeColor={n => {
if (n.type === 'input') return 'blue';
if (n.type === 'output') return 'green';
if (n.type === 'default') return 'red';
return '#FFCC00';
}}
/>
<Controls />
<Background
color="#888"
gap={16}
/>
<button
type="button"
onClick={addRandomNode}
style={{ position: 'absolute', right: 10, top: 30, zIndex: 4 }}
className="overview-example__add"
>
add node
</button>
</ReactFlow>
);
}
export default OverviewFlow;
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