| 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 type {EventPriority} from 'react-reconciler/src/ReactEventPriorities'; |
| 11 | |
| 12 | import {getEventPriority} from '../events/ReactDOMEventListener'; |
| 13 | import { |
| 14 | NoEventPriority, |
| 15 | DefaultEventPriority, |
| 16 | } from 'react-reconciler/src/ReactEventPriorities'; |
| 17 | |
| 18 | import ReactDOMSharedInternals from 'shared/ReactDOMSharedInternals'; |
| 19 | |
| 20 | export function setCurrentUpdatePriority( |
| 21 | newPriority: EventPriority, |
| 22 | // Closure will consistently not inline this function when it has arity 1 |
| 23 | // however when it has arity 2 even if the second arg is omitted at every |
| 24 | // callsite it seems to inline it even when the internal length of the function |
| 25 | // is much longer. I hope this is consistent enough to rely on across builds |
| 26 | IntentionallyUnusedArgument?: empty, |
| 27 | ): void { |
| 28 | ReactDOMSharedInternals.p /* currentUpdatePriority */ = newPriority; |
| 29 | } |
| 30 | |
| 31 | export function getCurrentUpdatePriority(): EventPriority { |
| 32 | return ReactDOMSharedInternals.p; /* currentUpdatePriority */ |
| 33 | } |
| 34 | |
| 35 | export function resolveUpdatePriority(): EventPriority { |
| 36 | const updatePriority = ReactDOMSharedInternals.p; /* currentUpdatePriority */ |
| 37 | if (updatePriority !== NoEventPriority) { |
| 38 | return updatePriority; |
| 39 | } |
| 40 | const currentEvent = window.event; |
| 41 | if (currentEvent === undefined) { |
| 42 | return DefaultEventPriority; |
| 43 | } |
| 44 | return getEventPriority(currentEvent.type); |
| 45 | } |
| 46 | |
| 47 | export function runWithPriority<T>(priority: EventPriority, fn: () => T): T { |
| 48 | const previousPriority = getCurrentUpdatePriority(); |
| 49 | try { |
| 50 | setCurrentUpdatePriority(priority); |
| 51 | return fn(); |
| 52 | } finally { |
| 53 | setCurrentUpdatePriority(previousPriority); |
| 54 | } |
| 55 | } |