import React, { useState } from 'react';
import ReactFlow, {
  ReactFlowProvider,
  addEdge,
  removeElements,
} from 'react-flow-renderer';

import Sidebar from './Sidebar';

import './zoompanhelper.css';

const initialElements = [
  {
    id: '1',
    type: 'input',
    data: { label: 'Node 1' },
    position: { x: 250, y: 5 },
  },
  { id: '2', data: { label: 'Node 2' }, position: { x: 100, y: 100 } },
  { id: '3', data: { label: 'Node 3' }, position: { x: 400, y: 100 } },
  { id: '4', data: { label: 'Node 4' }, position: { x: 400, y: 200 } },
  {
    id: 'e1-2',
    source: '1',
    target: '2',
  },
  { id: 'e1-3', source: '1', target: '3' },
];

const ProviderFlow = () => {
  const [elements, setElements] = useState(initialElements);
  const onConnect = (params) => setElements((els) => addEdge(params, els));
  const onElementsRemove = (elementsToRemove) =>
    setElements((els) => removeElements(elementsToRemove, els));

  return (
    <div className="zoompanflow">
      <ReactFlowProvider>
        <div className="reactflow-wrapper">
          <ReactFlow
            elements={elements}
            onConnect={onConnect}
            onElementsRemove={onElementsRemove}
          />
        </div>
        <Sidebar />
      </ReactFlowProvider>
    </div>
  );
};

export default ProviderFlow;

import React from 'react';
import { useStore, useZoomPanHelper } from 'react-flow-renderer';

export default () => {
  const store = useStore();
  const { zoomIn, zoomOut, setCenter } = useZoomPanHelper();

  const focusNode = () => {
    const { nodes } = store.getState();

    if (nodes.length) {
      const node = nodes[0];

      const x = node.__rf.position.x + node.__rf.width / 2;
      const y = node.__rf.position.y + node.__rf.height / 2;
      const zoom = 1.85;

      setCenter(x, y, zoom);
    }
  };

  return (
    <aside>
      <div className="description">
        This is an example of how you can use the zoom pan helper hook
      </div>
      <button onClick={focusNode}>focus node</button>
      <button onClick={zoomIn}>zoom in</button>
      <button onClick={zoomOut}>zoom out</button>
    </aside>
  );
};