ReactFlowProvider

如果你在页面上使用多个流程，或者使用客户端路由，你需要用 ReactFlowProvider 封装每个流程，以便每个流程都有自己的 store 实例。如果你想在 ReactFlow 组件外部访问内部状态，使用 ReactFlowProvider 也是必需的。

🌐 If you are working with multiple flows on a page or if you are using a client side router you need to wrap each flow with a ReactFlowProvider so that every flow has its own store instance. Using a ReactFlowProvider is also mandatory if you want to access the internal state outside of the ReactFlow component.


import React, { useCallback } from 'react';
import {
  Background,
  ReactFlow,
  ReactFlowProvider,
  useNodesState,
  useEdgesState,
  addEdge,
  Controls,
} from '@xyflow/react';
 
import Sidebar from './Sidebar';
import '@xyflow/react/dist/style.css';
 
const initialNodes = [
  {
    id: 'provider-1',
    type: 'input',
    data: { label: 'Node 1' },
    position: { x: 250, y: 5 },
  },
  { id: 'provider-2', data: { label: 'Node 2' }, position: { x: 100, y: 100 } },
  { id: 'provider-3', data: { label: 'Node 3' }, position: { x: 400, y: 100 } },
  { id: 'provider-4', data: { label: 'Node 4' }, position: { x: 400, y: 200 } },
];
 
const initialEdges = [
  {
    id: 'provider-e1-2',
    source: 'provider-1',
    target: 'provider-2',
    animated: true,
  },
  { id: 'provider-e1-3', source: 'provider-1', target: 'provider-3' },
];
 
const ProviderFlow = () => {
  const [nodes, setNodes, onNodesChange] = useNodesState(initialNodes);
  const [edges, setEdges, onEdgesChange] = useEdgesState(initialEdges);
  const onConnect = useCallback(
    (params) => setEdges((els) => addEdge(params, els)),
    [],
  );
 
  return (
    <div className="providerflow">
      <ReactFlowProvider>
        <div className="reactflow-wrapper">
          <ReactFlow
            nodes={nodes}
            edges={edges}
            onNodesChange={onNodesChange}
            onEdgesChange={onEdgesChange}
            onConnect={onConnect}
            fitView
          >
            <Controls />
            <Background />
          </ReactFlow>
        </div>
        <Sidebar nodes={nodes} setNodes={setNodes} />
      </ReactFlowProvider>
    </div>
  );
};
 
export default ProviderFlow;