| 1 | /** |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * |
| 4 | * This source code is licensed under the MIT license found in the |
| 5 | * LICENSE file in the root directory of this source tree. |
| 6 | * |
| 7 | * @flow |
| 8 | */ |
| 9 | |
| 10 | import * as React from 'react'; |
| 11 | import {Fragment, useCallback, useContext} from 'react'; |
| 12 | import {ProfilerContext} from './ProfilerContext'; |
| 13 | |
| 14 | import styles from './RootSelector.css'; |
| 15 | |
| 16 | export default function RootSelector(_: {}): React.Node { |
| 17 | const {profilingData, rootID, setRootID} = useContext(ProfilerContext); |
| 18 | |
| 19 | const options = []; |
| 20 | if (profilingData !== null) { |
| 21 | profilingData.dataForRoots.forEach((dataForRoot, id) => { |
| 22 | options.push( |
| 23 | <option key={id} value={id}> |
| 24 | {dataForRoot.displayName} |
| 25 | </option>, |
| 26 | ); |
| 27 | }); |
| 28 | } |
| 29 | |
| 30 | const handleChange = useCallback( |
| 31 | ({currentTarget}: $FlowFixMe) => { |
| 32 | setRootID(parseInt(currentTarget.value, 10)); |
| 33 | }, |
| 34 | [setRootID], |
| 35 | ); |
| 36 | |
| 37 | if (profilingData === null || profilingData.dataForRoots.size <= 1) { |
| 38 | // Don't take up visual space if there's only one root. |
| 39 | return null; |
| 40 | } |
| 41 | |
| 42 | return ( |
| 43 | <Fragment> |
| 44 | <div className={styles.Spacer} /> |
| 45 | <select value={rootID} onChange={handleChange}> |
| 46 | {options} |
| 47 | </select> |
| 48 | </Fragment> |
| 49 | ); |
| 50 | } |