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feat: useTransition
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15 files changed

+205
-32
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15 files changed

+205
-32
lines changed

‎demos/transition/AboutTab.tsx‎

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export default function AboutTab() {
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return <p>我是卡颂，这是我的个人页</p>;
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}

‎demos/transition/ContactTab.tsx‎

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export default function ContactTab() {
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return (
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<>
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<p>你可以通过如下方式联系我：</p>
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<ul>
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<li>B站：魔术师卡颂</li>
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<li>微信：kasong555</li>
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</ul>
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</>
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);
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}

‎demos/transition/PostsTab.tsx‎

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const PostsTab = function PostsTab() {
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const items = [];
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for (let i = 0; i < 500; i++) {
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items.push(<SlowPost key={i} index={i} />);
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}
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return <ul className="items">{items}</ul>;
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};
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function SlowPost({ index }) {
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const startTime = performance.now();
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while (performance.now() - startTime < 4) {}
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return <li className="item">博文 #{index + 1}</li>;
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}
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export default PostsTab;

‎demos/transition/TabButton.tsx‎

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import { useTransition } from 'react';
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export default function TabButton({ children, isActive, onClick }) {
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if (isActive) {
5+
return <b>{children}</b>;
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}
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return (
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<button
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onClick={() => {
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onClick();
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}}
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>
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{children}
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</button>
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);
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}

‎demos/transition/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<link rel="icon" type="image/svg+xml" href="/vite.svg" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Vite + React + TS</title>
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</head>
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<body>
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<div id="root"></div>
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<!-- <script type="module" src="main.ts"></script> -->
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<script type="module" src="main.tsx"></script>
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</body>
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</html>

‎demos/transition/main.tsx‎

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import ReactDOM from 'react-dom';
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import { useState, useTransition } from 'react';
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import TabButton from './TabButton';
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import AboutTab from './AboutTab';
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import PostsTab from './PostsTab';
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import ContactTab from './ContactTab';
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import './style.css';
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function App() {
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const [isPending, startTransition] = useTransition();
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const [tab, setTab] = useState('about');
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console.log('hello');
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function selectTab(nextTab) {
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startTransition(() => {
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setTab(nextTab);
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});
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}
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return (
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<>
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<TabButton isActive={tab === 'about'} onClick={() => selectTab('about')}>
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首页
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</TabButton>
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<TabButton isActive={tab === 'posts'} onClick={() => selectTab('posts')}>
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博客 (render慢)
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</TabButton>
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<TabButton
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isActive={tab === 'contact'}
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onClick={() => selectTab('contact')}
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>
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联系我
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</TabButton>
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<hr />
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{tab === 'about' && <AboutTab />}
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{tab === 'posts' && <PostsTab />}
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{tab === 'contact' && <ContactTab />}
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</>
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);
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}
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const root = ReactDOM.createRoot(document.querySelector('#root'));
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root.render(<App />);

‎demos/transition/style.css‎

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button {
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margin: 0 5px;
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}

‎package.json‎

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@@ -6,7 +6,7 @@
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"scripts": {
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"lint": "eslint --ext .js,.ts,.jsx,.tsx --fix --quiet ./packages",
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"build:dev": "rimraf dist && rollup --bundleConfigAsCjs --config scripts/rollup/dev.config.js ",
9-
"demo": "vite serve demos/test-fc --config scripts/vite/vite.config.js --force",
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"demo": "vite serve demos/transition --config scripts/vite/vite.config.js --force",
1010
"test": "jest --config scripts/jest/jest.config.js"
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},
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"keywords": [],

‎packages/react-reconciler/src/fiberHooks.ts‎

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@@ -1,6 +1,6 @@
1-
import { useState } from 'react';
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import { Dispatch } from 'react/src/currentDispatcher';
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import { Dispatcher } from 'react/src/currentDispatcher';
3+
import currentBatchConfig from 'react/src/currentBatchConfig';
44
import internals from 'shared/internals';
55
import { Action } from 'shared/ReactTypes';
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import { FiberNode } from './fiber';
@@ -80,12 +80,14 @@ export function renderWithHooks(wip: FiberNode, lane: Lane) {
8080

8181
const HooksDispatcherOnMount: Dispatcher = {
8282
useState: mountState,
83-
useEffect: mountEffect
83+
useEffect: mountEffect,
84+
useTransition: mountTransition
8485
};
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8687
const HooksDispatcherOnUpdate: Dispatcher = {
8788
useState: updateState,
88-
useEffect: updateEffect
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useEffect: updateEffect,
90+
useTransition: updateTransition
8991
};
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9193
function mountEffect(create: EffectCallback | void, deps: EffectDeps | void) {
@@ -215,17 +217,17 @@ function updateState<State>(): [State, Dispatch<State>] {
215217
// 保存在current中
216218
current.baseQueue = pending;
217219
queue.shared.pending = null;
220+
}
218221

219-
if (baseQueue !== null) {
220-
const {
221-
memoizedState,
222-
baseQueue: newBaseQueue,
223-
baseState: newBaseState
224-
} = processUpdateQueue(baseState, baseQueue, renderLane);
225-
hook.memoizedState = memoizedState;
226-
hook.baseState = newBaseState;
227-
hook.baseQueue = newBaseQueue;
228-
}
222+
if (baseQueue !== null) {
223+
const {
224+
memoizedState,
225+
baseQueue: newBaseQueue,
226+
baseState: newBaseState
227+
} = processUpdateQueue(baseState, baseQueue, renderLane);
228+
hook.memoizedState = memoizedState;
229+
hook.baseState = newBaseState;
230+
hook.baseQueue = newBaseQueue;
229231
}
230232

231233
return [hook.memoizedState, queue.dispatch as Dispatch<State>];
@@ -295,13 +297,40 @@ function mountState<State>(
295297
const queue = createUpdateQueue<State>();
296298
hook.updateQueue = queue;
297299
hook.memoizedState = memoizedState;
300+
hook.baseState = memoizedState;
298301

299302
// @ts-ignore
300303
const dispatch = dispatchSetState.bind(null, currentlyRenderingFiber, queue);
301304
queue.dispatch = dispatch;
302305
return [memoizedState, dispatch];
303306
}
304307

308+
function mountTransition(): [boolean, (callback: () => void) => void] {
309+
const [isPending, setPending] = mountState(false);
310+
const hook = mountWorkInProgresHook();
311+
const start = startTransition.bind(null, setPending);
312+
hook.memoizedState = start;
313+
return [isPending, start];
314+
}
315+
316+
function updateTransition(): [boolean, (callback: () => void) => void] {
317+
const [isPending] = updateState();
318+
const hook = updateWorkInProgresHook();
319+
const start = hook.memoizedState;
320+
return [isPending as boolean, start];
321+
}
322+
323+
function startTransition(setPending: Dispatch<boolean>, callback: () => void) {
324+
setPending(true);
325+
const prevTransition = currentBatchConfig.transition;
326+
currentBatchConfig.transition = 1;
327+
328+
callback();
329+
setPending(false);
330+
331+
currentBatchConfig.transition = prevTransition;
332+
}
333+
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function dispatchSetState<State>(
306335
fiber: FiberNode,
307336
updateQueue: UpdateQueue<State>,

‎packages/react-reconciler/src/fiberLanes.ts‎

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import ReactCurrentBatchConfig from 'react/src/currentBatchConfig';
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import {
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unstable_getCurrentPriorityLevel,
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unstable_IdlePriority,
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1011
export type Lane = number;
1112
export type Lanes = number;
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13-
export const SyncLane = 0b0001;
14-
export const NoLane = 0b0000;
15-
export const NoLanes = 0b0000;
16-
export const InputContinuousLane = 0b0010;
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export const DefaultLane = 0b0100;
18-
export const IdleLane = 0b1000;
14+
export const SyncLane = 0b00001;
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export const NoLane = 0b00000;
16+
export const NoLanes = 0b00000;
17+
export const InputContinuousLane = 0b00010;
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export const DefaultLane = 0b00100;
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export const TransitionLane = 0b01000;
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export const IdleLane = 0b10000;
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2022
export function mergeLanes(laneA: Lane, laneB: Lane): Lanes {
2123
return laneA | laneB;
2224
}
2325

2426
export function requestUpdateLane() {
27+
const isTransition = ReactCurrentBatchConfig.transition !== null;
28+
if (isTransition) {
29+
return TransitionLane;
30+
}
31+
2532
// 从上下文环境中获取Scheduler优先级
2633
const currentSchedulerPriority = unstable_getCurrentPriorityLevel();
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const lane = schedulerPriorityToLane(currentSchedulerPriority);

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