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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 } |