react/packages/react-devtools-shared/src/devtools/views/Components/InspectHostNodesToggle.js

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 */

import React, {useCallback, useContext, useEffect, useState} from 'react';
import {BridgeContext} from '../context';
import Toggle from '../Toggle';
import ButtonIcon from '../ButtonIcon';

export default function InspectHostNodesToggle() {
  const [isInspecting, setIsInspecting] = useState(false);
  const bridge = useContext(BridgeContext);

  const handleChange = useCallback(
    (isChecked: boolean) => {
      setIsInspecting(isChecked);

      if (isChecked) {
        bridge.send('startInspectingNative');
      } else {
        bridge.send('stopInspectingNative', false);
      }
    },
    [bridge],
  );

  useEffect(() => {
    const onStopInspectingNative = () => setIsInspecting(false);
    bridge.addListener('stopInspectingNative', onStopInspectingNative);
    return () =>
      bridge.removeListener('stopInspectingNative', onStopInspectingNative);
  }, [bridge]);

  return (
    <Toggle
      onChange={handleChange}
      isChecked={isInspecting}
      title="Select an element in the page to inspect it">
      <ButtonIcon type="search" />
    </Toggle>
  );
}