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福建省建设厅网站 2013,律师事务所网站建设方案,万州论坛网站建设,宜昌有做网站的公司吗ClassComponent 的更新 1 #xff09; 概述 在 react 中 class component#xff0c;是一个非常重要的角色它承担了 react 中 更新整个应用的API setStateforceUpdate 在react当中#xff0c;只有更新了state之后#xff0c;整个应用才会重新进行渲染在 class component 中…ClassComponent 的更新 1 概述 在 react 中 class component是一个非常重要的角色它承担了 react 中 更新整个应用的API setStateforceUpdate 在react当中只有更新了state之后整个应用才会重新进行渲染在 class component 中, 它的逻辑相对复杂 2 源码 在 packages/react-reconciler/src/ReactFiberBeginWork.js // 这个方法就是更新 ClassComponent 组件的一个过程 function updateClassComponent(current: Fiber | null,workInProgress: Fiber,Component: any,nextProps,renderExpirationTime: ExpirationTime, ) {// Push context providers early to prevent context stack mismatches.// During mounting we dont know the child context yet as the instance doesnt exist.// We will invalidate the child context in finishClassComponent() right after rendering.// 先跳过 context 相关的逻辑let hasContext;if (isLegacyContextProvider(Component)) {hasContext true;pushLegacyContextProvider(workInProgress);} else {hasContext false;}prepareToReadContext(workInProgress, renderExpirationTime);// instance 就是我们 class component通过new这个class获取的一个对象const instance workInProgress.stateNode;// 在这里面它声明了一个 shouldUpdate 的一个属性let shouldUpdate; // 先判断instance是否存在, 比如说我们第一次通过 ReactDOM.render 进行渲染的过程当中// 在从上往下第一次渲染的过程当中第一次更新到 class component 的时候// 它的instance肯定是不存在的因为它还没有被更新过所以它的节点肯定是没有被创建的if (instance null) {// 接下去, 判断一下current是否等于null// current等于null的情况是代表在进入第一次渲染因为current它还不存在// 如果current不等于null, 代表我们至少已经经历过一次渲染了// 这时候 instance 不存在而 current 存在说明第一次渲染的时候没有创建这个instance// 同样说明这个组件是被 suspended 的一个组件处于suspended的状态// 在这里react认为它相当于是第一次被渲染, 在初次渲染的时候只是抛出了一个promise// 并没有真正的渲染出它的子节点, 抛出了一个promise之后接下去的渲染就结束了if (current ! null) {// An class component without an instance only mounts if it suspended// inside a non- concurrent tree, in an inconsistent state. We want to// tree it like a new mount, even though an empty version of it already// committed. Disconnect the alternate pointers.current.alternate null;workInProgress.alternate null;// Since this is conceptually a new fiber, schedule a Placement effectworkInProgress.effectTag | Placement;}// In the initial pass we might need to construct the instance.// 对于没有instance的一个情况需要去创建 class instanceconstructClassInstance(workInProgress,Component,nextProps,renderExpirationTime,);// 并且要mount这个 class instancemountClassInstance(workInProgress,Component,nextProps,renderExpirationTime,);// 在第一次渲染的时候会执行上述两个方法并且 shouldUpdate true;shouldUpdate true;} else if (current null) {// In a resume, well already have an instance we can reuse.// 在 有instance 和 没有 current 的情况下这种是之前被中断的// 在执行 class component 的 render 方法的时候 报错但 instance 已被创建// 代表着可以复用 instanceshouldUpdate resumeMountClassInstance(workInProgress,Component,nextProps,renderExpirationTime,);} else {// 对于又有 current 又有 instance的情况说明组件已经被重新渲染了// 这个 updateClassInstance 方法和 上述 resumeMountClassInstance 类似// 最大的区别是 内部判断 comonentDidUpdate shouldUpdate updateClassInstance(current,workInProgress,Component,nextProps,renderExpirationTime,);}// 这里最终调用 finishClassComponentreturn finishClassComponent(current,workInProgress,Component,shouldUpdate,hasContext,renderExpirationTime,); }进入 constructClassInstance function constructClassInstance(workInProgress: Fiber,ctor: any,props: any,renderExpirationTime: ExpirationTime, ): any {// 先跳过 context 相关let isLegacyContextConsumer false;let unmaskedContext emptyContextObject;let context null;const contextType ctor.contextType;// if (typeof contextType object contextType ! null) {// 跳过 DEVif (__DEV__) {if (contextType.$$typeof ! REACT_CONTEXT_TYPE !didWarnAboutInvalidateContextType.has(ctor)) {didWarnAboutInvalidateContextType.add(ctor);warningWithoutStack(false,%s defines an invalid contextType. contextType should point to the Context object returned by React.createContext(). Did you accidentally pass the Context.Provider instead?,getComponentName(ctor) || Component,);}}context readContext((contextType: any));} else {unmaskedContext getUnmaskedContext(workInProgress, ctor, true);const contextTypes ctor.contextTypes;isLegacyContextConsumer contextTypes ! null contextTypes ! undefined;context isLegacyContextConsumer? getMaskedContext(workInProgress, unmaskedContext): emptyContextObject;}// Instantiate twice to help detect side-effects.if (__DEV__) {if (debugRenderPhaseSideEffects ||(debugRenderPhaseSideEffectsForStrictMode workInProgress.mode StrictMode)) {new ctor(props, context); // eslint-disable-line no-new}}// ctor 是 construct 的一个缩写 这个 ctor 就是在 ReactElement当中// 存在的那个type也就是 class component 定义的那个class// 传入 props和context对应于 ReactBaseClasses.js 里面Component 函数 接收的这两个参数// 第三个参数 updater 后面在 adoptClassInstance 里面设置const instance new ctor(props, context);// 获取 stateconst state (workInProgress.memoizedState instance.state ! null instance.state ! undefined? instance.state: null);adoptClassInstance(workInProgress, instance);if (__DEV__) {if (typeof ctor.getDerivedStateFromProps function state null) {const componentName getComponentName(ctor) || Component;if (!didWarnAboutUninitializedState.has(componentName)) {didWarnAboutUninitializedState.add(componentName);warningWithoutStack(false,%s uses getDerivedStateFromProps but its initial state is %s. This is not recommended. Instead, define the initial state by assigning an object to this.state in the constructor of %s. This ensures that getDerivedStateFromProps arguments have a consistent shape.,componentName,instance.state null ? null : undefined,componentName,);}}// If new component APIs are defined, unsafe lifecycles wont be called.// Warn about these lifecycles if they are present.// Dont warn about react-lifecycles-compat polyfilled methods though.if (typeof ctor.getDerivedStateFromProps function ||typeof instance.getSnapshotBeforeUpdate function) {let foundWillMountName null;let foundWillReceivePropsName null;let foundWillUpdateName null;if (typeof instance.componentWillMount function instance.componentWillMount.__suppressDeprecationWarning ! true) {foundWillMountName componentWillMount;} else if (typeof instance.UNSAFE_componentWillMount function) {foundWillMountName UNSAFE_componentWillMount;}if (typeof instance.componentWillReceiveProps function instance.componentWillReceiveProps.__suppressDeprecationWarning ! true) {foundWillReceivePropsName componentWillReceiveProps;} else if (typeof instance.UNSAFE_componentWillReceiveProps function) {foundWillReceivePropsName UNSAFE_componentWillReceiveProps;}if (typeof instance.componentWillUpdate function instance.componentWillUpdate.__suppressDeprecationWarning ! true) {foundWillUpdateName componentWillUpdate;} else if (typeof instance.UNSAFE_componentWillUpdate function) {foundWillUpdateName UNSAFE_componentWillUpdate;}if (foundWillMountName ! null ||foundWillReceivePropsName ! null ||foundWillUpdateName ! null) {const componentName getComponentName(ctor) || Component;const newApiName typeof ctor.getDerivedStateFromProps function? getDerivedStateFromProps(): getSnapshotBeforeUpdate();if (!didWarnAboutLegacyLifecyclesAndDerivedState.has(componentName)) {didWarnAboutLegacyLifecyclesAndDerivedState.add(componentName);warningWithoutStack(false,Unsafe legacy lifecycles will not be called for components using new component APIs.\n\n %s uses %s but also contains the following legacy lifecycles:%s%s%s\n\n The above lifecycles should be removed. Learn more about this warning here:\n https://fb.me/react-async-component-lifecycle-hooks,componentName,newApiName,foundWillMountName ! null ? \n ${foundWillMountName} : ,foundWillReceivePropsName ! null? \n ${foundWillReceivePropsName}: ,foundWillUpdateName ! null ? \n ${foundWillUpdateName} : ,);}}}}// Cache unmasked context so we can avoid recreating masked context unless necessary.// ReactFiberContext usually updates this cache but cant for newly-created instances.if (isLegacyContextConsumer) {cacheContext(workInProgress, unmaskedContext, context);}return instance; }进入 adoptClassInstancefunction adoptClassInstance(workInProgress: Fiber, instance: any): void {instance.updater classComponentUpdater; // 挂载 update 方法workInProgress.stateNode instance; // instance 挂载到 stateNode 以供下次进来时使用下次进来就会存在了// The instance needs access to the fiber so that it can schedule updatesReactInstanceMap.set(instance, workInProgress);if (__DEV__) {instance._reactInternalInstance fakeInternalInstance;} }进入 ReactInstanceMap 这个就是对 instance 上 _reactInternalFiber 属性的设置export function remove(key) {key._reactInternalFiber undefined; }export function get(key) {return key._reactInternalFiber; }export function has(key) {return key._reactInternalFiber ! undefined; }export function set(key, value) {key._reactInternalFiber value; }这也意味着通过 this._reactInternalFiber 就可以拿到当前 fiber 对象 进入 mountClassInstance // Invokes the mount life-cycles on a previously never rendered instance. function mountClassInstance(workInProgress: Fiber,ctor: any,newProps: any,renderExpirationTime: ExpirationTime, ): void {if (__DEV__) {checkClassInstance(workInProgress, ctor, newProps);}const instance workInProgress.stateNode;instance.props newProps;instance.state workInProgress.memoizedState;instance.refs emptyRefsObject;const contextType ctor.contextType;if (typeof contextType object contextType ! null) {instance.context readContext(contextType);} else {const unmaskedContext getUnmaskedContext(workInProgress, ctor, true);instance.context getMaskedContext(workInProgress, unmaskedContext);}if (__DEV__) {if (instance.state newProps) {const componentName getComponentName(ctor) || Component;if (!didWarnAboutDirectlyAssigningPropsToState.has(componentName)) {didWarnAboutDirectlyAssigningPropsToState.add(componentName);warningWithoutStack(false,%s: It is not recommended to assign props directly to state because updates to props wont be reflected in state. In most cases, it is better to use props directly.,componentName,);}}if (workInProgress.mode StrictMode) {ReactStrictModeWarnings.recordUnsafeLifecycleWarnings(workInProgress,instance,);ReactStrictModeWarnings.recordLegacyContextWarning(workInProgress,instance,);}if (warnAboutDeprecatedLifecycles) {ReactStrictModeWarnings.recordDeprecationWarnings(workInProgress,instance,);}}// 获取 updateQueue初次渲染这个 updateQueue 是空的// 对于有 setState 的情况它的 updateQueen 里面可能有多个update// 这个时候, 需要调用这个 updateQueen 来去得到一个新的statelet updateQueue workInProgress.updateQueue;if (updateQueue ! null) {// 这里 计算出新的state 并赋值给 workInProgress.memoizedStateprocessUpdateQueue(workInProgress,updateQueue,newProps,instance,renderExpirationTime,);// 同时更新 instance.stateinstance.state workInProgress.memoizedState;}// 判断是否有这个生命周期方法const getDerivedStateFromProps ctor.getDerivedStateFromProps;if (typeof getDerivedStateFromProps function) {// 如果存在该生命周期方法则计算新的state// 这个生命周期会在组件更新的过程中被调用applyDerivedStateFromProps(workInProgress,ctor,getDerivedStateFromProps,newProps,);instance.state workInProgress.memoizedState;}// In order to support react-lifecycles-compat polyfilled components,// Unsafe lifecycles should not be invoked for components using the new APIs.// 判断是否有 componentWillMount 生命周期方法// 在这个生命周期方法中会执行 setState 方法if (typeof ctor.getDerivedStateFromProps ! function typeof instance.getSnapshotBeforeUpdate ! function (typeof instance.UNSAFE_componentWillMount function ||typeof instance.componentWillMount function)) {// callComponentWillMount(workInProgress, instance);// If we had additional state updates during this life-cycle, lets// process them now.// 执行了 这个生命周期方法就需要重新执行 updateQueue// 如果在这时执行了 setState, 立马被反映到组件上面updateQueue workInProgress.updateQueue;if (updateQueue ! null) {processUpdateQueue(workInProgress,updateQueue,newProps,instance,renderExpirationTime,);instance.state workInProgress.memoizedState;}}if (typeof instance.componentDidMount function) {workInProgress.effectTag | Update;} }进入 processUpdateQueueexport function processUpdateQueueState(workInProgress: Fiber,queue: UpdateQueueState,props: any,instance: any,renderExpirationTime: ExpirationTime, ): void {hasForceUpdate false;// 克隆 updateQueuequeue ensureWorkInProgressQueueIsAClone(workInProgress, queue);if (__DEV__) {currentlyProcessingQueue queue;}// These values may change as we process the queue.let newBaseState queue.baseState;let newFirstUpdate null;let newExpirationTime NoWork;// Iterate through the list of updates to compute the result.let update queue.firstUpdate; let resultState newBaseState;while (update ! null) {const updateExpirationTime update.expirationTime;if (updateExpirationTime renderExpirationTime) {// This update does not have sufficient priority. Skip it.if (newFirstUpdate null) {// This is the first skipped update. It will be the first update in// the new list.newFirstUpdate update;// Since this is the first update that was skipped, the current result// is the new base state.newBaseState resultState;}// Since this update will remain in the list, update the remaining// expiration time.if (newExpirationTime updateExpirationTime) {newExpirationTime updateExpirationTime;}} else {// This update does have sufficient priority. Process it and compute// a new result.resultState getStateFromUpdate(workInProgress,queue,update,resultState,props,instance,);const callback update.callback;// 判断是否有 callbackif (callback ! null) {workInProgress.effectTag | Callback; // 加上 Callback 这块// Set this to null, in case it was mutated during an aborted render.update.nextEffect null; // 防止在中断的渲染中被修改if (queue.lastEffect null) {queue.firstEffect queue.lastEffect update; // 链表操作} else {queue.lastEffect.nextEffect update;queue.lastEffect update;}}}// Continue to the next update.update update.next;}// Separately, iterate though the list of captured updates.let newFirstCapturedUpdate null;update queue.firstCapturedUpdate;while (update ! null) {const updateExpirationTime update.expirationTime;if (updateExpirationTime renderExpirationTime) {// This update does not have sufficient priority. Skip it.if (newFirstCapturedUpdate null) {// This is the first skipped captured update. It will be the first// update in the new list.newFirstCapturedUpdate update;// If this is the first update that was skipped, the current result is// the new base state.if (newFirstUpdate null) {newBaseState resultState;}}// Since this update will remain in the list, update the remaining// expiration time.if (newExpirationTime updateExpirationTime) {newExpirationTime updateExpirationTime;}} else {// This update does have sufficient priority. Process it and compute// a new result.resultState getStateFromUpdate(workInProgress,queue,update,resultState,props,instance,);const callback update.callback;if (callback ! null) {workInProgress.effectTag | Callback;// Set this to null, in case it was mutated during an aborted render.update.nextEffect null;if (queue.lastCapturedEffect null) {queue.firstCapturedEffect queue.lastCapturedEffect update;} else {queue.lastCapturedEffect.nextEffect update;queue.lastCapturedEffect update;}}}update update.next;}if (newFirstUpdate null) {queue.lastUpdate null;}if (newFirstCapturedUpdate null) {queue.lastCapturedUpdate null;} else {workInProgress.effectTag | Callback;}if (newFirstUpdate null newFirstCapturedUpdate null) {// We processed every update, without skipping. That means the new base// state is the same as the result state.newBaseState resultState;}queue.baseState newBaseState;queue.firstUpdate newFirstUpdate;queue.firstCapturedUpdate newFirstCapturedUpdate;// Set the remaining expiration time to be whatever is remaining in the queue.// This should be fine because the only two other things that contribute to// expiration time are props and context. Were already in the middle of the// begin phase by the time we start processing the queue, so weve already// dealt with the props. Context in components that specify// shouldComponentUpdate is tricky; but well have to account for// that regardless.workInProgress.expirationTime newExpirationTime;workInProgress.memoizedState resultState;if (__DEV__) {currentlyProcessingQueue null;} }进入 ensureWorkInProgressQueueIsAClone function ensureWorkInProgressQueueIsACloneState(workInProgress: Fiber,queue: UpdateQueueState, ): UpdateQueueState {const current workInProgress.alternate;if (current ! null) {// If the work-in-progress queue is equal to the current queue,// we need to clone it first.if (queue current.updateQueue) {// 要保证 workInProgress.updateQueue 是一个克隆的queue, 而非直接进行修改queue workInProgress.updateQueue cloneUpdateQueue(queue); // 拷贝 queue}}return queue; }进入 getStateFromUpdatefunction getStateFromUpdateState(workInProgress: Fiber,queue: UpdateQueueState,update: UpdateState,prevState: State,nextProps: any,instance: any, ): any {switch (update.tag) {case ReplaceState: {const payload update.payload;if (typeof payload function) {// Updater functionif (__DEV__) {if (debugRenderPhaseSideEffects ||(debugRenderPhaseSideEffectsForStrictMode workInProgress.mode StrictMode)) {payload.call(instance, prevState, nextProps);}}return payload.call(instance, prevState, nextProps);}// State objectreturn payload;}// 这里 a ~b 表示: a 除了b之外的所有属性case CaptureUpdate: {workInProgress.effectTag (workInProgress.effectTag ~ShouldCapture) | DidCapture; // 这里最终剩下的 只有 DidCapture}// Intentional fallthroughcase UpdateState: {const payload update.payload;let partialState;if (typeof payload function) {// Updater functionif (__DEV__) {if (debugRenderPhaseSideEffects ||(debugRenderPhaseSideEffectsForStrictMode workInProgress.mode StrictMode)) {payload.call(instance, prevState, nextProps);}}// 如果是 function 则调用 payload 传入之前的参数 计算出 statepartialState payload.call(instance, prevState, nextProps);} else {// Partial state objectpartialState payload;}// 处理特殊情况if (partialState null || partialState undefined) {// Null and undefined are treated as no-ops.return prevState;}// Merge the partial state and the previous state.// 合并return Object.assign({}, prevState, partialState);}case ForceUpdate: {hasForceUpdate true;return prevState;}}return prevState; }进入 finishClassComponent function finishClassComponent(current: Fiber | null,workInProgress: Fiber,Component: any,shouldUpdate: boolean,hasContext: boolean,renderExpirationTime: ExpirationTime, ) {// Refs should update even if shouldComponentUpdate returns false// 这个先跳过markRef(current, workInProgress);// 判断 workInProgress.effectTag 上是否有 DidCaptureconst didCaptureError (workInProgress.effectTag DidCapture) ! NoEffect;// 在没有更新也没有错误捕获的情况下if (!shouldUpdate !didCaptureError) {// Context providers should defer to sCU for renderingif (hasContext) {invalidateContextProvider(workInProgress, Component, false);}// 跳过更新return bailoutOnAlreadyFinishedWork(current,workInProgress,renderExpirationTime,);}const instance workInProgress.stateNode;// RerenderReactCurrentOwner.current workInProgress;let nextChildren;// 有任何错误捕获, 但没有配置这个api的时候// 这个 getDerivedStateFromError 生命周期的api和 componentDidCatch 有区别, 后者在下次更新的时候处理中间可能instance不存在(因为出错了)// 就继续可能引发在这个class component上面设置的 ref拿到一个null, 操作ref的时候就会出现错误// 在前者这个新的生命周期的api中, 在本次渲染中生成 state, 渲染出属性, 这样对于 instance 对象依然存在 对应 ref 就可以拿到实际的对象if (didCaptureError typeof Component.getDerivedStateFromError ! function) {// If we captured an error, but getDerivedStateFrom catch is not defined,// unmount all the children. componentDidCatch will schedule an update to// re-render a fallback. This is temporary until we migrate everyone to// the new API.// TODO: Warn in a future release.nextChildren null;if (enableProfilerTimer) {stopProfilerTimerIfRunning(workInProgress);}} else {if (__DEV__) {ReactCurrentFiber.setCurrentPhase(render);nextChildren instance.render();if (debugRenderPhaseSideEffects ||(debugRenderPhaseSideEffectsForStrictMode workInProgress.mode StrictMode)) {instance.render();}ReactCurrentFiber.setCurrentPhase(null);} else {// 调用 render 方法计算出新的 childrennextChildren instance.render();}}// React DevTools reads this flag.workInProgress.effectTag | PerformedWork; // 增加 PerformedWork// 不是第一次渲染并且有错误捕获if (current ! null didCaptureError) {// If were recovering from an error, reconcile without reusing any of// the existing children. Conceptually, the normal children and the children// that are shown on error are two different sets, so we shouldnt reuse// normal children even if their identities match.forceUnmountCurrentAndReconcile(current,workInProgress,nextChildren,renderExpirationTime,);} else {// 正常情况调用 调和 childrenreconcileChildren(current,workInProgress,nextChildren,renderExpirationTime,);}// Memoize state using the values we just used to render.// TODO: Restructure so we never read values from the instance.workInProgress.memoizedState instance.state;// The context might have changed so we need to recalculate it.if (hasContext) {invalidateContextProvider(workInProgress, Component, true);}return workInProgress.child; // 把 render 方法渲染出来的第一个子节点 返回给 nextUnitOfWork, 就可以在 workLoop 中继续进行更新的流程 }简单总结 以上是更新 class component 的整体流程一开始要使用 constructClassInstance 创建 class instance内部会根据不同情况调用不同方法并且要调用 mountClassInstance 来挂载如果是第一次渲染被中断的情况 如果存在 instance 则重复使用 instance它调用的生命周期方法仍然是 第一次渲染的生命周期方法也就是 componentDidMount 如果不是第一次渲染的情况 调用 updateClassInstance 方法这种会最终调用 componentDidUpdate 方法 它们中间的流程类似 判断各种情况创建新的 instance 或 复用之前的通过 processUpdateQueue 来获取新的 state会把它赋值到 instance 和 fiber 上面进行记录最终都会调用 finishClassComponent 这里面做一些错误判断的处理以及是否可以跳过更新的过程还有重新调和子节点 (通用流程)
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