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import type {
VNode,
VNodeNormalizedRef,
VNodeNormalizedRefAtom,
VNodeRef,
} from './vnode'
import {
EMPTY_OBJ,
NO,
ShapeFlags,
hasOwn,
isArray,
isFunction,
isString,
remove,
} from '@vue/shared'
import { isAsyncWrapper } from './apiAsyncComponent'
import { warn } from './warning'
import { isRef, toRaw } from '@vue/reactivity'
import { ErrorCodes, callWithErrorHandling } from './errorHandling'
import { type SchedulerJob, SchedulerJobFlags } from './scheduler'
import { queuePostRenderEffect } from './renderer'
import { type ComponentOptions, getComponentPublicInstance } from './component'
import { knownTemplateRefs } from './helpers/useTemplateRef'
const pendingSetRefMap = new WeakMap<VNodeNormalizedRef, SchedulerJob>()
/**
* Function for handling a template ref
*/
export function setRef(
rawRef: VNodeNormalizedRef,
oldRawRef: VNodeNormalizedRef | null,
parentSuspense: SuspenseBoundary | null,
vnode: VNode,
isUnmount = false,
): void {
if (isArray(rawRef)) {
rawRef.forEach((r, i) =>
setRef(
r,
oldRawRef && (isArray(oldRawRef) ? oldRawRef[i] : oldRawRef),
parentSuspense,
vnode,
isUnmount,
),
)
return
}
if (isAsyncWrapper(vnode) && !isUnmount) {
// #4999 if an async component already resolved and cached by KeepAlive,
// we need to set the ref to inner component
if (
vnode.shapeFlag & ShapeFlags.COMPONENT_KEPT_ALIVE &&
(vnode.type as ComponentOptions).__asyncResolved &&
vnode.component!.subTree.component
) {
setRef(rawRef, oldRawRef, parentSuspense, vnode.component!.subTree)
}
// otherwise, nothing needs to be done because the template ref
// is forwarded to inner component
return
}
const refValue =
vnode.shapeFlag & ShapeFlags.STATEFUL_COMPONENT
? getComponentPublicInstance(vnode.component!)
: vnode.el
const value = isUnmount ? null : refValue
const { i: owner, r: ref } = rawRef
if (__DEV__ && !owner) {
warn(
`Missing ref owner context. ref cannot be used on hoisted vnodes. ` +
`A vnode with ref must be created inside the render function.`,
)
return
}
const oldRef = oldRawRef && (oldRawRef as VNodeNormalizedRefAtom).r
const refs = owner.refs === EMPTY_OBJ ? (owner.refs = {}) : owner.refs
const setupState = owner.setupState
const rawSetupState = toRaw(setupState)
const canSetSetupRef =
setupState === EMPTY_OBJ
? NO
: (key: string) => {
if (__DEV__) {
if (hasOwn(rawSetupState, key) && !isRef(rawSetupState[key])) {
warn(
`Template ref "${key}" used on a non-ref value. ` +
`It will not work in the production build.`,
)
}
if (knownTemplateRefs.has(rawSetupState[key] as any)) {
return false
}
}
return hasOwn(rawSetupState, key)
}
const canSetRef = (ref: VNodeRef) => {
return !__DEV__ || !knownTemplateRefs.has(ref as any)
}
// dynamic ref changed. unset old ref
if (oldRef != null && oldRef !== ref) {
invalidatePendingSetRef(oldRawRef!)
if (isString(oldRef)) {
refs[oldRef] = null
if (canSetSetupRef(oldRef)) {
setupState[oldRef] = null
}
} else if (isRef(oldRef)) {
if (canSetRef(oldRef)) {
oldRef.value = null
}
// this type assertion is valid since `oldRef` has already been asserted to be non-null
const oldRawRefAtom = oldRawRef as VNodeNormalizedRefAtom
if (oldRawRefAtom.k) refs[oldRawRefAtom.k] = null
}
}
if (isFunction(ref)) {
callWithErrorHandling(ref, owner, ErrorCodes.FUNCTION_REF, [value, refs])
} else {
const _isString = isString(ref)
const _isRef = isRef(ref)
if (_isString || _isRef) {
const doSet = () => {
if (rawRef.f) {
const existing = _isString
? canSetSetupRef(ref)
? setupState[ref]
: refs[ref]
: canSetRef(ref) || !rawRef.k
? ref.value
: refs[rawRef.k]
if (isUnmount) {
isArray(existing) && remove(existing, refValue)
} else {
if (!isArray(existing)) {
if (_isString) {
refs[ref] = [refValue]
if (canSetSetupRef(ref)) {
setupState[ref] = refs[ref]
}
} else {
const newVal = [refValue]
if (canSetRef(ref)) {
ref.value = newVal
}
if (rawRef.k) refs[rawRef.k] = newVal
}
} else if (!existing.includes(refValue)) {
existing.push(refValue)
}
}
} else if (_isString) {
refs[ref] = value
if (canSetSetupRef(ref)) {
setupState[ref] = value
}
} else if (_isRef) {
if (canSetRef(ref)) {
ref.value = value
}
if (rawRef.k) refs[rawRef.k] = value
} else if (__DEV__) {
warn('Invalid template ref type:', ref, `(${typeof ref})`)
}
}
if (value) {
// #1789: for non-null values, set them after render
// null values means this is unmount and it should not overwrite another
// ref with the same key
const job: SchedulerJob = () => {
doSet()
pendingSetRefMap.delete(rawRef)
}
job.id = -1
pendingSetRefMap.set(rawRef, job)
queuePostRenderEffect(job, parentSuspense)
} else {
invalidatePendingSetRef(rawRef)
doSet()
}
} else if (__DEV__) {
warn('Invalid template ref type:', ref, `(${typeof ref})`)
}
}
}
function invalidatePendingSetRef(rawRef: VNodeNormalizedRef) {
const pendingSetRef = pendingSetRefMap.get(rawRef)
if (pendingSetRef) {
pendingSetRef.flags! |= SchedulerJobFlags.DISPOSED
pendingSetRefMap.delete(rawRef)
}
}
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