useOnViewportChange

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The useOnViewportChange hook lets you listen for changes to the viewport such as panning and zooming. You can provide a callback for each phase of a viewport change: onStart, onChange, and onEnd.

import { useCallback } from 'react';
import { useOnViewportChange } from 'reactflow';
 
function ViewportChangeLogger() {
  useOnViewportChange({
    onStart: (viewport: Viewport) => console.log('start', viewport),
    onChange: (viewport: Viewport) => console.log('change', viewport),
    onEnd: (viewport: Viewport) => console.log('end', viewport),
  });
 
  return null;
}

Signature

Name	Type
#Params
#`options`	`object`
#`options.onStart`	`(viewport: Viewport) => void`
#`options.onChange`	`(viewport: Viewport) => void`
#`options.onEnd`	`(viewport: Viewport) => void`
#Returns
#	`void`

Notes

This hook can only be used in a component that is a child of a <ReactFlowProvider /> or a <ReactFlow /> component.

useOnSelectionChange()useReactFlow()