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type ComponentInternalInstance,
type ComponentOptions,
type ConcreteComponent,
type SetupContext,
currentInstance,
getComponentName,
getCurrentInstance,
} from '../component'
import {
Comment,
type VNode,
type VNodeProps,
cloneVNode,
invokeVNodeHook,
isSameVNodeType,
isVNode,
} from '../vnode'
import { warn } from '../warning'
import {
injectHook,
onBeforeUnmount,
onMounted,
onUnmounted,
onUpdated,
} from '../apiLifecycle'
import {
ShapeFlags,
invokeArrayFns,
isArray,
isRegExp,
isString,
remove,
} from '@vue/shared'
import { watch } from '../apiWatch'
import {
type ElementNamespace,
MoveType,
type RendererElement,
type RendererInternals,
type RendererNode,
invalidateMount,
queuePostRenderEffect,
} from '../renderer'
import { setTransitionHooks } from './BaseTransition'
import type { ComponentRenderContext } from '../componentPublicInstance'
import { devtoolsComponentAdded } from '../devtools'
import { isAsyncWrapper } from '../apiAsyncComponent'
import { isSuspense } from './Suspense'
import { LifecycleHooks } from '../enums'
type MatchPattern = string | RegExp | (string | RegExp)[]
export interface KeepAliveProps {
include?: MatchPattern
exclude?: MatchPattern
max?: number | string
}
type CacheKey = PropertyKey | ConcreteComponent
type Cache = Map<CacheKey, VNode>
type Keys = Set<CacheKey>
export interface KeepAliveContext extends ComponentRenderContext {
renderer: RendererInternals
activate: (
vnode: VNode,
container: RendererElement,
anchor: RendererNode | null,
namespace: ElementNamespace,
optimized: boolean,
) => void
deactivate: (vnode: VNode) => void
}
export const isKeepAlive = (vnode: VNode): boolean =>
(vnode.type as any).__isKeepAlive
const KeepAliveImpl: ComponentOptions = {
name: `KeepAlive`,
// Marker for special handling inside the renderer. 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
}
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