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getCurrentInstance,
SetupContext,
ComponentInternalInstance,
ComponentOptions
} from '../component'
import {
cloneVNode,
Comment,
isSameVNodeType,
VNode,
VNodeArrayChildren,
Fragment
} from '../vnode'
import { warn } from '../warning'
import { isKeepAlive } from './KeepAlive'
import { toRaw } from '@vue/reactivity'
import { callWithAsyncErrorHandling, ErrorCodes } from '../errorHandling'
import { ShapeFlags, PatchFlags } from '@vue/shared'
import { onBeforeUnmount, onMounted } from '../apiLifecycle'
import { RendererElement } from '../renderer'
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?: (el: HostElement) => void
onEnter?: (el: HostElement, done: () => void) => void
onAfterEnter?: (el: HostElement) => void
onEnterCancelled?: (el: HostElement) => void
// leave
onBeforeLeave?: (el: HostElement) => void
onLeave?: (el: HostElement, done: () => void) => void
onAfterLeave?: (el: HostElement) => void
onLeaveCancelled?: (el: HostElement) => void // only fired in persisted mode
// appear
onBeforeAppear?: (el: HostElement) => void
onAppear?: (el: HostElement, done: () => void) => void
onAfterAppear?: (el: HostElement) => void
onAppearCancelled?: (el: HostElement) => void
}
export interface TransitionHooks<
HostElement extends RendererElement = 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 = (
hook: ((el: any) => void) | Array<(el: any) => void> | undefined,
args?: any[]
) => 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.
_enterCb?: PendingCallback
_leaveCb?: 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]
const BaseTransitionImpl: ComponentOptions = {
name: `BaseTransition`,
props: {
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
},
setup(props: BaseTransitionProps, { slots }: SetupContext) {
const instance = getCurrentInstance()!
const state = useTransitionState()
let prevTransitionKey: any
return () => {
const children =
slots.default && getTransitionRawChildren(slots.default(), true)
Iif (!children || !children.length) {
return
}
// warn multiple elements
if (__DEV__ && children.length > 1) {
warn(
'<transition> can only be used on a single element or component. Use ' +
'<transition-group> for lists.'
)
}
// 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}`)
}
// at this point children has a guaranteed length of 1.
const child = children[0]
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 = getKeepAliveChild(child)
Iif (!innerChild) {
return emptyPlaceholder(child)
}
const enterHooks = resolveTransitionHooks(
innerChild,
rawProps,
state,
instance
)
setTransitionHooks(innerChild, enterHooks)
const oldChild = instance.subTree
const oldInnerChild = oldChild && getKeepAliveChild(oldChild)
let transitionKeyChanged = false
const { getTransitionKey } = innerChild.type as any
Iif (getTransitionKey) {
const key = getTransitionKey()
if (prevTransitionKey === undefined) {
prevTransitionKey = key
} else Iif (key !== prevTransitionKey) {
prevTransitionKey = key
transitionKeyChanged = true
}
}
// handle mode
if (
oldInnerChild &&
oldInnerChild.type !== Comment &&
(!isSameVNodeType(innerChild, oldInnerChild) || transitionKeyChanged)
) {
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') {
state.isLeaving = true
// return placeholder node and queue update when leave finishes
leavingHooks.afterLeave = () => {
state.isLeaving = false
instance.update()
}
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._leaveCb = () => {
earlyRemove()
el._leaveCb = undefined
delete enterHooks.delayedLeave
}
enterHooks.delayedLeave = delayedLeave
}
}
}
return child
}
}
}
if (__COMPAT__) {
BaseTransitionImpl.__isBuiltIn = true
}
// export the public type for h/tsx inference
// also to avoid inline import() in generated d.ts files
export const BaseTransition = BaseTransitionImpl as any as {
new (): {
$props: BaseTransitionProps<any>
}
}
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
): 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 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._leaveCb) {
el._leaveCb(true /* cancelled */)
}
// for toggled element with same key (v-if)
const leavingVNode = leavingVNodesCache[key]
if (
leavingVNode &&
isSameVNodeType(vnode, leavingVNode) &&
leavingVNode.el!._leaveCb
) {
// force early removal (not cancelled)
leavingVNode.el!._leaveCb()
}
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._enterCb = (cancelled?) => {
if (called) return
called = true
if (cancelled) {
callHook(cancelHook, [el])
} else {
callHook(afterHook, [el])
}
if (hooks.delayedLeave) {
hooks.delayedLeave()
}
el._enterCb = undefined
})
if (hook) {
hook(el, done)
Iif (hook.length <= 1) {
done()
}
} else E{
done()
}
},
leave(el, remove) {
const key = String(vnode.key)
if (el._enterCb) {
el._enterCb(true /* cancelled */)
}
Iif (state.isUnmounting) {
return remove()
}
callHook(onBeforeLeave, [el])
let called = false
const done = (el._leaveCb = (cancelled?) => {
if (called) return
called = true
remove()
if (cancelled) {
callHook(onLeaveCancelled, [el])
} else {
callHook(onAfterLeave, [el])
}
el._leaveCb = undefined
if (leavingVNodesCache[key] === vnode) {
delete leavingVNodesCache[key]
}
})
leavingVNodesCache[key] = vnode
if (onLeave) {
onLeave(el, done)
Iif (onLeave.length <= 1) {
done()
}
} else E{
done()
}
},
clone(vnode) {
return resolveTransitionHooks(vnode, props, state, instance)
}
}
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 getKeepAliveChild(vnode: VNode): VNode | undefined {
return isKeepAlive(vnode)
? vnode.children
? ((vnode.children as VNodeArrayChildren)[0] as VNode)
: undefined
: vnode
}
export function setTransitionHooks(vnode: VNode, hooks: TransitionHooks) {
if (vnode.shapeFlag & ShapeFlags.COMPONENT && vnode.component) {
setTransitionHooks(vnode.component.subTree, hooks)
} else Iif (__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
): VNode[] {
let ret: VNode[] = []
let keyedFragmentCount = 0
for (let i = 0; i < children.length; i++) {
const child = children[i]
// handle fragment children case, e.g. v-for
if (child.type === Fragment) {
Iif (child.patchFlag & PatchFlags.KEYED_FRAGMENT) keyedFragmentCount++
ret = ret.concat(
getTransitionRawChildren(child.children as VNode[], keepComment)
)
}
// comment placeholders should be skipped, e.g. v-if
else if (keepComment || child.type !== Comment) {
ret.push(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.
Iif (keyedFragmentCount > 1) {
for (let i = 0; i < ret.length; i++) {
ret[i].patchFlag = PatchFlags.BAIL
}
}
return ret
}
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