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We are not using a === // check directly on KeepAlive in the renderer, because importing it directly // would prevent it from being tree-shaken. __isKeepAlive: true, props: { include: [String, RegExp, Array], exclude: [String, RegExp, Array], max: [String, Number], }, setup(props: KeepAliveProps, { slots }: SetupContext) { const instance = getCurrentInstance()! // KeepAlive communicates with the instantiated renderer via the // ctx where the renderer passes in its internals, // and the KeepAlive instance exposes activate/deactivate implementations. // The whole point of this is to avoid importing KeepAlive directly in the // renderer to facilitate tree-shaking. const sharedContext = instance.ctx as KeepAliveContext // if the internal renderer is not registered, it indicates that this is server-side rendering, // for KeepAlive, we just need to render its children if (__SSR__ && !sharedContext.renderer) { return () => { const children = slots.default && slots.default() return children && children.length === 1 ? children[0] : children } } const cache: Cache = new Map() const keys: Keys = new Set() let current: VNode | null = null if (__DEV__ || __FEATURE_PROD_DEVTOOLS__) { ;(instance as any).__v_cache = cache } const parentSuspense = instance.suspense const { renderer: { p: patch, m: move, um: _unmount, o: { createElement }, }, } = sharedContext const storageContainer = createElement('div') sharedContext.activate = ( vnode, container, anchor, namespace, optimized, ) => { const instance = vnode.component! move(vnode, container, anchor, MoveType.ENTER, parentSuspense) // in case props have changed patch( instance.vnode, vnode, container, anchor, instance, parentSuspense, namespace, vnode.slotScopeIds, optimized, ) queuePostRenderEffect(() => { instance.isDeactivated = false if (instance.a) { invokeArrayFns(instance.a) } const vnodeHook = vnode.props && vnode.props.onVnodeMounted if (vnodeHook) { invokeVNodeHook(vnodeHook, instance.parent, vnode) } }, parentSuspense) if (__DEV__ || __FEATURE_PROD_DEVTOOLS__) { // Update components tree devtoolsComponentAdded(instance) } } sharedContext.deactivate = (vnode: VNode) => { const instance = vnode.component! invalidateMount(instance.m) invalidateMount(instance.a) move(vnode, storageContainer, null, MoveType.LEAVE, parentSuspense) queuePostRenderEffect(() => { if (instance.da) { invokeArrayFns(instance.da) } const vnodeHook = vnode.props && vnode.props.onVnodeUnmounted if (vnodeHook) { invokeVNodeHook(vnodeHook, instance.parent, vnode) } instance.isDeactivated = true }, parentSuspense) if (__DEV__ || __FEATURE_PROD_DEVTOOLS__) { // Update components tree devtoolsComponentAdded(instance) } } function unmount(vnode: VNode) { // reset the shapeFlag so it can be properly unmounted resetShapeFlag(vnode) _unmount(vnode, instance, parentSuspense, true) } function pruneCache(filter: (name: string) => boolean) { cache.forEach((vnode, key) => { const name = getComponentName(vnode.type as ConcreteComponent) if (name && !filter(name)) { pruneCacheEntry(key) } }) } function pruneCacheEntry(key: CacheKey) { const cached = cache.get(key) as VNode if (cached && (!current || !isSameVNodeType(cached, current))) { unmount(cached) } else if (current) { // current active instance should no longer be kept-alive. // we can't unmount it now but it might be later, so reset its flag now. resetShapeFlag(current) } cache.delete(key) keys.delete(key) } // prune cache on include/exclude prop change watch( () => [props.include, props.exclude], ([include, exclude]) => { include && pruneCache(name => matches(include, name)) exclude && pruneCache(name => !matches(exclude, name)) }, // prune post-render after `current` has been updated { flush: 'post', deep: true }, ) // cache sub tree after render let pendingCacheKey: CacheKey | null = null const cacheSubtree = () => { // fix #1621, the pendingCacheKey could be 0 if (pendingCacheKey != null) { // if KeepAlive child is a Suspense, it needs to be cached after Suspense resolves // avoid caching vnode that not been mounted if (isSuspense(instance.subTree.type)) { queuePostRenderEffect(() => { cache.set(pendingCacheKey!, getInnerChild(instance.subTree)) }, instance.subTree.suspense) } else { cache.set(pendingCacheKey, getInnerChild(instance.subTree)) } } } onMounted(cacheSubtree) onUpdated(cacheSubtree) onBeforeUnmount(() => { cache.forEach(cached => { const { subTree, suspense } = instance const vnode = getInnerChild(subTree) if (cached.type === vnode.type && cached.key === vnode.key) { // current instance will be unmounted as part of keep-alive's unmount resetShapeFlag(vnode) // but invoke its deactivated hook here const da = vnode.component!.da da && queuePostRenderEffect(da, suspense) return } unmount(cached) }) }) return () => { pendingCacheKey = null if (!slots.default) { return (current = null) } const children = slots.default() const rawVNode = children[0] if (children.length > 1) { if (__DEV__) { warn(`KeepAlive should contain exactly one component child.`) } current = null return children } else if ( !isVNode(rawVNode) || (!(rawVNode.shapeFlag & ShapeFlags.STATEFUL_COMPONENT) && !(rawVNode.shapeFlag & ShapeFlags.SUSPENSE)) ) { current = null return rawVNode } let vnode = getInnerChild(rawVNode) // #6028 Suspense ssContent maybe a comment VNode, should avoid caching it if (vnode.type === Comment) { current = null return vnode } const comp = vnode.type as ConcreteComponent // for async components, name check should be based in its loaded // inner component if available const name = getComponentName( isAsyncWrapper(vnode) ? (vnode.type as ComponentOptions).__asyncResolved || {} : comp, ) const { include, exclude, max } = props if ( (include && (!name || !matches(include, name))) || (exclude && name && matches(exclude, name)) ) { // #11717 vnode.shapeFlag &= ~ShapeFlags.COMPONENT_SHOULD_KEEP_ALIVE current = vnode return rawVNode } const key = vnode.key == null ? comp : vnode.key const cachedVNode = cache.get(key) // clone vnode if it's reused because we are going to mutate it if (vnode.el) { vnode = cloneVNode(vnode) if (rawVNode.shapeFlag & ShapeFlags.SUSPENSE) { rawVNode.ssContent = vnode } } // #1511 it's possible for the returned vnode to be cloned due to attr // fallthrough or scopeId, so the vnode here may not be the final vnode // that is mounted. Instead of caching it directly, we store the pending // key and cache `instance.subTree` (the normalized vnode) in // mounted/updated hooks. pendingCacheKey = key if (cachedVNode) { // copy over mounted state vnode.el = cachedVNode.el vnode.component = cachedVNode.component if (vnode.transition) { // recursively update transition hooks on subTree setTransitionHooks(vnode, vnode.transition!) } // avoid vnode being mounted as fresh vnode.shapeFlag |= ShapeFlags.COMPONENT_KEPT_ALIVE // make this key the freshest keys.delete(key) keys.add(key) } else { keys.add(key) // prune oldest entry if (max && keys.size > parseInt(max as string, 10)) { pruneCacheEntry(keys.values().next().value!) } } // avoid vnode being unmounted vnode.shapeFlag |= ShapeFlags.COMPONENT_SHOULD_KEEP_ALIVE current = vnode return isSuspense(rawVNode.type) ? rawVNode : vnode } }, } const decorate = (t: typeof KeepAliveImpl) => { t.__isBuiltIn = true return t } // export the public type for h/tsx inference // also to avoid inline import() in generated d.ts files export const KeepAlive = (__COMPAT__ ? /*@__PURE__*/ decorate(KeepAliveImpl) : KeepAliveImpl) as any as { __isKeepAlive: true new (): { $props: VNodeProps & KeepAliveProps $slots: { default(): VNode[] } } } function matches(pattern: MatchPattern, name: string): boolean { if (isArray(pattern)) { return pattern.some((p: string | RegExp) => matches(p, name)) } else if (isString(pattern)) { return pattern.split(',').includes(name) } else if (isRegExp(pattern)) { pattern.lastIndex = 0 return pattern.test(name) } /* v8 ignore next */ return false } export function onActivated( hook: Function, target?: ComponentInternalInstance | null, ): void { registerKeepAliveHook(hook, LifecycleHooks.ACTIVATED, target) } export function onDeactivated( hook: Function, target?: ComponentInternalInstance | null, ): void { registerKeepAliveHook(hook, LifecycleHooks.DEACTIVATED, target) } function registerKeepAliveHook( hook: Function & { __wdc?: Function }, type: LifecycleHooks, target: ComponentInternalInstance | null = currentInstance, ) { // cache the deactivate branch check wrapper for injected hooks so the same // hook can be properly deduped by the scheduler. "__wdc" stands for "with // deactivation check". const wrappedHook = hook.__wdc || (hook.__wdc = () => { // only fire the hook if the target instance is NOT in a deactivated branch. let current: ComponentInternalInstance | null = target while (current) { if (current.isDeactivated) { return } current = current.parent } return hook() }) injectHook(type, wrappedHook, target) // In addition to registering it on the target instance, we walk up the parent // chain and register it on all ancestor instances that are keep-alive roots. // This avoids the need to walk the entire component tree when invoking these // hooks, and more importantly, avoids the need to track child components in // arrays. if (target) { let current = target.parent while (current && current.parent) { if (isKeepAlive(current.parent.vnode)) { injectToKeepAliveRoot(wrappedHook, type, target, current) } current = current.parent } } } function injectToKeepAliveRoot( hook: Function & { __weh?: Function }, type: LifecycleHooks, target: ComponentInternalInstance, keepAliveRoot: ComponentInternalInstance, ) { // injectHook wraps the original for error handling, so make sure to remove // the wrapped version. const injected = injectHook(type, hook, keepAliveRoot, true /* prepend */) onUnmounted(() => { remove(keepAliveRoot[type]!, injected) }, target) } function resetShapeFlag(vnode: VNode) { // bitwise operations to remove keep alive flags vnode.shapeFlag &= ~ShapeFlags.COMPONENT_SHOULD_KEEP_ALIVE vnode.shapeFlag &= ~ShapeFlags.COMPONENT_KEPT_ALIVE } function getInnerChild(vnode: VNode) { return vnode.shapeFlag & ShapeFlags.SUSPENSE ? vnode.ssContent! : vnode } |