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type ComponentInternalInstance,
type ComponentOptions,
type SetupContext,
getCurrentInstance,
} from '../component'
import {
Comment,
Fragment,
type VNode,
type VNodeArrayChildren,
cloneVNode,
isSameVNodeType,
} from '../vnode'
import { warn } from '../warning'
import { isKeepAlive } from './KeepAlive'
import { toRaw } from '@vue/reactivity'
import { ErrorCodes, callWithAsyncErrorHandling } from '../errorHandling'
import { PatchFlags, ShapeFlags, isArray, isFunction } from '@vue/shared'
import { onBeforeUnmount, onMounted } from '../apiLifecycle'
import { isTeleport } from './Teleport'
import type { RendererElement } from '../renderer'
import { SchedulerJobFlags } from '../scheduler'
type Hook<T = () => void> = T | T[]
const leaveCbKey: unique symbol = Symbol('_leaveCb')
const enterCbKey: unique symbol = Symbol('_enterCb')
export interface BaseTransitionProps<HostElement = RendererElement> {
mode?: 'in-out' | 'out-in' | 'default'
appear?: boolean
// If true, indicates this is a transition that doesn't actually insert/remove
// the element, but toggles the show / hidden status instead.
// The transition hooks are injected, but will be skipped by the renderer.
// Instead, a custom directive can control the transition by calling the
// injected hooks (e.g. v-show).
persisted?: boolean
// Hooks. Using camel case for easier usage in render functions & JSX.
// In templates these can be written as @before-enter="xxx" as prop names
// are camelized.
onBeforeEnter?: Hook<(el: HostElement) => void>
onEnter?: Hook<(el: HostElement, done: () => void) => void>
onAfterEnter?: Hook<(el: HostElement) => void>
onEnterCancelled?: Hook<(el: HostElement) => void>
// leave
onBeforeLeave?: Hook<(el: HostElement) => void>
onLeave?: Hook<(el: HostElement, done: () => void) => void>
onAfterLeave?: Hook<(el: HostElement) => void>
onLeaveCancelled?: Hook<(el: HostElement) => void> // only fired in persisted mode
// appear
onBeforeAppear?: Hook<(el: HostElement) => void>
onAppear?: Hook<(el: HostElement, done: () => void) => void>
onAfterAppear?: Hook<(el: HostElement) => void>
onAppearCancelled?: Hook<(el: HostElement) => void>
}
export interface TransitionHooks<HostElement = RendererElement> {
mode: BaseTransitionProps['mode']
persisted: boolean
beforeEnter(el: HostElement): void
enter(el: HostElement): void
leave(el: HostElement, remove: () => void): void
clone(vnode: VNode): TransitionHooks<HostElement>
// optional
afterLeave?(): void
delayLeave?(
el: HostElement,
earlyRemove: () => void,
delayedLeave: () => void,
): void
delayedLeave?(): void
}
export type TransitionHookCaller = <T extends any[] = [el: any]>(
hook: Hook<(...args: T) => void> | undefined,
args?: T,
) => void
export type PendingCallback = (cancelled?: boolean) => void
export interface TransitionState {
isMounted: boolean
isLeaving: boolean
isUnmounting: boolean
// Track pending leave callbacks for children of the same key.
// This is used to force remove leaving a child when a new copy is entering.
leavingVNodes: Map<any, Record<string, VNode>>
}
export interface TransitionElement {
// in persisted mode (e.g. v-show), the same element is toggled, so the
// pending enter/leave callbacks may need to be cancelled if the state is toggled
// before it finishes.
[enterCbKey]?: PendingCallback
[leaveCbKey]?: PendingCallback
}
export function useTransitionState(): TransitionState {
const state: TransitionState = {
isMounted: false,
isLeaving: false,
isUnmounting: false,
leavingVNodes: new Map(),
}
onMounted(() => {
state.isMounted = true
})
onBeforeUnmount(() => {
state.isUnmounting = true
})
return state
}
const TransitionHookValidator = [Function, Array]
export const BaseTransitionPropsValidators: Record<string, any> = {
mode: String,
appear: Boolean,
persisted: Boolean,
// enter
onBeforeEnter: TransitionHookValidator,
onEnter: TransitionHookValidator,
onAfterEnter: TransitionHookValidator,
onEnterCancelled: TransitionHookValidator,
// leave
onBeforeLeave: TransitionHookValidator,
onLeave: TransitionHookValidator,
onAfterLeave: TransitionHookValidator,
onLeaveCancelled: TransitionHookValidator,
// appear
onBeforeAppear: TransitionHookValidator,
onAppear: TransitionHookValidator,
onAfterAppear: TransitionHookValidator,
onAppearCancelled: TransitionHookValidator,
}
const recursiveGetSubtree = (instance: ComponentInternalInstance): VNode => {
const subTree = instance.subTree
return subTree.component ? recursiveGetSubtree(subTree.component) : subTree
}
const BaseTransitionImpl: ComponentOptions = {
name: `BaseTransition`,
props: BaseTransitionPropsValidators,
setup(props: BaseTransitionProps, { slots }: SetupContext) {
const instance = getCurrentInstance()!
const state = useTransitionState()
return () => {
const children =
slots.default && getTransitionRawChildren(slots.default(), true)
if (!children || !children.length) {
return
}
const child: VNode = findNonCommentChild(children)
// there's no need to track reactivity for these props so use the raw
// props for a bit better perf
const rawProps = toRaw(props)
const { mode } = rawProps
// check mode
if (
__DEV__ &&
mode &&
mode !== 'in-out' &&
mode !== 'out-in' &&
mode !== 'default'
) {
warn(`invalid <transition> mode: ${mode}`)
}
if (state.isLeaving) {
return emptyPlaceholder(child)
}
// in the case of <transition><keep-alive/></transition>, we need to
// compare the type of the kept-alive children.
const innerChild = getInnerChild(child)
if (!innerChild) {
return emptyPlaceholder(child)
}
let enterHooks = resolveTransitionHooks(
innerChild,
rawProps,
state,
instance,
// #11061, ensure enterHooks is fresh after clone
hooks => (enterHooks = hooks),
)
if (innerChild.type !== Comment) {
setTransitionHooks(innerChild, enterHooks)
}
const oldChild = instance.subTree
const oldInnerChild = oldChild && getInnerChild(oldChild)
// handle mode
if (
oldInnerChild &&
oldInnerChild.type !== Comment &&
!isSameVNodeType(innerChild, oldInnerChild) &&
recursiveGetSubtree(instance).type !== Comment
) {
const leavingHooks = resolveTransitionHooks(
oldInnerChild,
rawProps,
state,
instance,
)
// update old tree's hooks in case of dynamic transition
setTransitionHooks(oldInnerChild, leavingHooks)
// switching between different views
if (mode === 'out-in' && innerChild.type !== Comment) {
state.isLeaving = true
// return placeholder node and queue update when leave finishes
leavingHooks.afterLeave = () => {
state.isLeaving = false
// #6835
// it also needs to be updated when active is undefined
if (!(instance.job.flags! & SchedulerJobFlags.DISPOSED)) {
instance.update()
}
delete leavingHooks.afterLeave
}
return emptyPlaceholder(child)
} else if (mode === 'in-out' && innerChild.type !== Comment) {
leavingHooks.delayLeave = (
el: TransitionElement,
earlyRemove,
delayedLeave,
) => {
const leavingVNodesCache = getLeavingNodesForType(
state,
oldInnerChild,
)
leavingVNodesCache[String(oldInnerChild.key)] = oldInnerChild
// early removal callback
el[leaveCbKey] = () => {
earlyRemove()
el[leaveCbKey] = undefined
delete enterHooks.delayedLeave
}
enterHooks.delayedLeave = delayedLeave
}
}
}
return child
}
},
}
if (__COMPAT__) {
BaseTransitionImpl.__isBuiltIn = true
}
function findNonCommentChild(children: VNode[]): VNode {
let child: VNode = children[0]
if (children.length > 1) {
let hasFound = false
// locate first non-comment child
for (const c of children) {
if (c.type !== Comment) {
if (__DEV__ && hasFound) {
// warn more than one non-comment child
warn(
'<transition> can only be used on a single element or component. ' +
'Use <transition-group> for lists.',
)
break
}
child = c
hasFound = true
if (!__DEV__) break
}
}
}
return child
}
// export the public type for h/tsx inference
// also to avoid inline import() in generated d.ts files
export const BaseTransition = BaseTransitionImpl as unknown as {
new (): {
$props: BaseTransitionProps<any>
$slots: {
default(): VNode[]
}
}
}
function getLeavingNodesForType(
state: TransitionState,
vnode: VNode,
): Record<string, VNode> {
const { leavingVNodes } = state
let leavingVNodesCache = leavingVNodes.get(vnode.type)!
if (!leavingVNodesCache) {
leavingVNodesCache = Object.create(null)
leavingVNodes.set(vnode.type, leavingVNodesCache)
}
return leavingVNodesCache
}
// The transition hooks are attached to the vnode as vnode.transition
// and will be called at appropriate timing in the renderer.
export function resolveTransitionHooks(
vnode: VNode,
props: BaseTransitionProps<any>,
state: TransitionState,
instance: ComponentInternalInstance,
postClone?: (hooks: TransitionHooks) => void,
): TransitionHooks {
const {
appear,
mode,
persisted = false,
onBeforeEnter,
onEnter,
onAfterEnter,
onEnterCancelled,
onBeforeLeave,
onLeave,
onAfterLeave,
onLeaveCancelled,
onBeforeAppear,
onAppear,
onAfterAppear,
onAppearCancelled,
} = props
const key = String(vnode.key)
const leavingVNodesCache = getLeavingNodesForType(state, vnode)
const callHook: TransitionHookCaller = (hook, args) => {
hook &&
callWithAsyncErrorHandling(
hook,
instance,
ErrorCodes.TRANSITION_HOOK,
args,
)
}
const callAsyncHook = (
hook: Hook<(el: any, done: () => void) => void>,
args: [TransitionElement, () => void],
) => {
const done = args[1]
callHook(hook, args)
if (isArray(hook)) {
if (hook.every(hook => hook.length <= 1)) done()
} else if (hook.length <= 1) {
done()
}
}
const hooks: TransitionHooks<TransitionElement> = {
mode,
persisted,
beforeEnter(el) {
let hook = onBeforeEnter
if (!state.isMounted) {
if (appear) {
hook = onBeforeAppear || onBeforeEnter
} else {
return
}
}
// for same element (v-show)
if (el[leaveCbKey]) {
el[leaveCbKey](true /* cancelled */)
}
// for toggled element with same key (v-if)
const leavingVNode = leavingVNodesCache[key]
if (
leavingVNode &&
isSameVNodeType(vnode, leavingVNode) &&
(leavingVNode.el as TransitionElement)[leaveCbKey]
) {
// force early removal (not cancelled)
;(leavingVNode.el as TransitionElement)[leaveCbKey]!()
}
callHook(hook, [el])
},
enter(el) {
let hook = onEnter
let afterHook = onAfterEnter
let cancelHook = onEnterCancelled
if (!state.isMounted) {
if (appear) {
hook = onAppear || onEnter
afterHook = onAfterAppear || onAfterEnter
cancelHook = onAppearCancelled || onEnterCancelled
} else {
return
}
}
let called = false
const done = (el[enterCbKey] = (cancelled?) => {
if (called) return
called = true
if (cancelled) {
callHook(cancelHook, [el])
} else {
callHook(afterHook, [el])
}
if (hooks.delayedLeave) {
hooks.delayedLeave()
}
el[enterCbKey] = undefined
})
if (hook) {
callAsyncHook(hook, [el, done])
} else {
done()
}
},
leave(el, remove) {
const key = String(vnode.key)
if (el[enterCbKey]) {
el[enterCbKey](true /* cancelled */)
}
if (state.isUnmounting) {
return remove()
}
callHook(onBeforeLeave, [el])
let called = false
const done = (el[leaveCbKey] = (cancelled?) => {
if (called) return
called = true
remove()
if (cancelled) {
callHook(onLeaveCancelled, [el])
} else {
callHook(onAfterLeave, [el])
}
el[leaveCbKey] = undefined
if (leavingVNodesCache[key] === vnode) {
delete leavingVNodesCache[key]
}
})
leavingVNodesCache[key] = vnode
if (onLeave) {
callAsyncHook(onLeave, [el, done])
} else {
done()
}
},
clone(vnode) {
const hooks = resolveTransitionHooks(
vnode,
props,
state,
instance,
postClone,
)
if (postClone) postClone(hooks)
return hooks
},
}
return hooks
}
// the placeholder really only handles one special case: KeepAlive
// in the case of a KeepAlive in a leave phase we need to return a KeepAlive
// placeholder with empty content to avoid the KeepAlive instance from being
// unmounted.
function emptyPlaceholder(vnode: VNode): VNode | undefined {
if (isKeepAlive(vnode)) {
vnode = cloneVNode(vnode)
vnode.children = null
return vnode
}
}
function getInnerChild(vnode: VNode): VNode | undefined {
if (!isKeepAlive(vnode)) {
if (isTeleport(vnode.type) && vnode.children) {
return findNonCommentChild(vnode.children as VNode[])
}
return vnode
}
// #7121 ensure get the child component subtree in case
// it's been replaced during HMR
if (__DEV__ && vnode.component) {
return vnode.component.subTree
}
const { shapeFlag, children } = vnode
if (children) {
if (shapeFlag & ShapeFlags.ARRAY_CHILDREN) {
return (children as VNodeArrayChildren)[0] as VNode
}
if (
shapeFlag & ShapeFlags.SLOTS_CHILDREN &&
isFunction((children as any).default)
) {
return (children as any).default()
}
}
}
export function setTransitionHooks(vnode: VNode, hooks: TransitionHooks): void {
if (vnode.shapeFlag & ShapeFlags.COMPONENT && vnode.component) {
vnode.transition = hooks
setTransitionHooks(vnode.component.subTree, hooks)
} else if (__FEATURE_SUSPENSE__ && vnode.shapeFlag & ShapeFlags.SUSPENSE) {
vnode.ssContent!.transition = hooks.clone(vnode.ssContent!)
vnode.ssFallback!.transition = hooks.clone(vnode.ssFallback!)
} else {
vnode.transition = hooks
}
}
export function getTransitionRawChildren(
children: VNode[],
keepComment: boolean = false,
parentKey?: VNode['key'],
): VNode[] {
let ret: VNode[] = []
let keyedFragmentCount = 0
for (let i = 0; i < children.length; i++) {
let child = children[i]
// #5360 inherit parent key in case of <template v-for>
const key =
parentKey == null
? child.key
: String(parentKey) + String(child.key != null ? child.key : i)
// handle fragment children case, e.g. v-for
if (child.type === Fragment) {
if (child.patchFlag & PatchFlags.KEYED_FRAGMENT) keyedFragmentCount++
ret = ret.concat(
getTransitionRawChildren(child.children as VNode[], keepComment, key),
)
}
// comment placeholders should be skipped, e.g. v-if
else if (keepComment || child.type !== Comment) {
ret.push(key != null ? cloneVNode(child, { key }) : child)
}
}
// #1126 if a transition children list contains multiple sub fragments, these
// fragments will be merged into a flat children array. Since each v-for
// fragment may contain different static bindings inside, we need to de-op
// these children to force full diffs to ensure correct behavior.
if (keyedFragmentCount > 1) {
for (let i = 0; i < ret.length; i++) {
ret[i].patchFlag = PatchFlags.BAIL
}
}
return ret
}
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