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New events for Astro's view transition API (#9090)
* draft new view transition events * initial state for PR * remove intraPageTransitions flag based on review comments * add createAnimationScope after review comments * remove style elements from styles after review comments * remove quotes from animation css to enable set:text * added changeset * move scrollRestoration call from popstate handler to scroll update * Update .changeset/few-keys-heal.md Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca> * Less confusing after following review comments * Less confusing after following review comments --------- Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| --- | ||
| 'astro': minor | ||
| --- | ||
| Take full control over the behavior of view transitions! | ||
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| Three new events now complement the existing `astro:after-swap` and `astro:page-load` events: | ||
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| ``` javascript | ||
| astro:before-preparation // Control how the DOM and other resources of the target page are loaded | ||
| astro:after-preparation // Last changes before taking off? Remove that loading indicator? Here you go! | ||
| astro:before-swap // Control how the DOM is updated to match the new page | ||
| ``` | ||
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| The `astro:before-*` events allow you to change properties and strategies of the view transition implementation. | ||
| The `astro:after-*` events are notifications that a phase is complete. | ||
| Head over to docs to see [the full view transitions lifecycle](https://docs.astro.build/en/guides/view-transitions/#lifecycle-events) including these new events! |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| import { updateScrollPosition } from './router.js'; | ||
| import type { Direction, NavigationTypeString } from './types.js'; | ||
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| export const TRANSITION_BEFORE_PREPARATION = 'astro:before-preparation'; | ||
| export const TRANSITION_AFTER_PREPARATION = 'astro:after-preparation'; | ||
| export const TRANSITION_BEFORE_SWAP = 'astro:before-swap'; | ||
| export const TRANSITION_AFTER_SWAP = 'astro:after-swap'; | ||
| export const TRANSITION_PAGE_LOAD = 'astro:page-load'; | ||
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| type Events = | ||
| | typeof TRANSITION_AFTER_PREPARATION | ||
| | typeof TRANSITION_AFTER_SWAP | ||
| | typeof TRANSITION_PAGE_LOAD; | ||
| export const triggerEvent = (name: Events) => document.dispatchEvent(new Event(name)); | ||
| export const onPageLoad = () => triggerEvent(TRANSITION_PAGE_LOAD); | ||
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| /* | ||
| * Common stuff | ||
| */ | ||
| class BeforeEvent extends Event { | ||
| readonly from: URL; | ||
| to: URL; | ||
| direction: Direction | string; | ||
| readonly navigationType: NavigationTypeString; | ||
| readonly sourceElement: Element | undefined; | ||
| readonly info: any; | ||
| newDocument: Document; | ||
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| constructor( | ||
| type: string, | ||
| eventInitDict: EventInit | undefined, | ||
| from: URL, | ||
| to: URL, | ||
| direction: Direction | string, | ||
| navigationType: NavigationTypeString, | ||
| sourceElement: Element | undefined, | ||
| info: any, | ||
| newDocument: Document | ||
| ) { | ||
| super(type, eventInitDict); | ||
| this.from = from; | ||
| this.to = to; | ||
| this.direction = direction; | ||
| this.navigationType = navigationType; | ||
| this.sourceElement = sourceElement; | ||
| this.info = info; | ||
| this.newDocument = newDocument; | ||
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| Object.defineProperties(this, { | ||
| from: { enumerable: true }, | ||
| to: { enumerable: true, writable: true }, | ||
| direction: { enumerable: true, writable: true }, | ||
| navigationType: { enumerable: true }, | ||
| sourceElement: { enumerable: true }, | ||
| info: { enumerable: true }, | ||
| newDocument: { enumerable: true, writable: true }, | ||
| }); | ||
| } | ||
| } | ||
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| /* | ||
| * TransitionBeforePreparationEvent | ||
| */ | ||
| export const isTransitionBeforePreparationEvent = ( | ||
| value: any | ||
| ): value is TransitionBeforePreparationEvent => value.type === TRANSITION_BEFORE_PREPARATION; | ||
| export class TransitionBeforePreparationEvent extends BeforeEvent { | ||
| formData: FormData | undefined; | ||
| loader: () => Promise<void>; | ||
| constructor( | ||
| from: URL, | ||
| to: URL, | ||
| direction: Direction | string, | ||
| navigationType: NavigationTypeString, | ||
| sourceElement: Element | undefined, | ||
| info: any, | ||
| newDocument: Document, | ||
| formData: FormData | undefined, | ||
| loader: (event: TransitionBeforePreparationEvent) => Promise<void> | ||
| ) { | ||
| super( | ||
| TRANSITION_BEFORE_PREPARATION, | ||
| { cancelable: true }, | ||
| from, | ||
| to, | ||
| direction, | ||
| navigationType, | ||
| sourceElement, | ||
| info, | ||
| newDocument | ||
| ); | ||
| this.formData = formData; | ||
| this.loader = loader.bind(this, this); | ||
| Object.defineProperties(this, { | ||
| formData: { enumerable: true }, | ||
| loader: { enumerable: true, writable: true }, | ||
| }); | ||
| } | ||
| } | ||
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| /* | ||
| * TransitionBeforeSwapEvent | ||
| */ | ||
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| export const isTransitionBeforeSwapEvent = (value: any): value is TransitionBeforeSwapEvent => | ||
| value.type === TRANSITION_BEFORE_SWAP; | ||
| export class TransitionBeforeSwapEvent extends BeforeEvent { | ||
| readonly direction: Direction | string; | ||
| readonly viewTransition: ViewTransition; | ||
| swap: () => void; | ||
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| constructor( | ||
| afterPreparation: BeforeEvent, | ||
| viewTransition: ViewTransition, | ||
| swap: (event: TransitionBeforeSwapEvent) => void | ||
| ) { | ||
| super( | ||
| TRANSITION_BEFORE_SWAP, | ||
| undefined, | ||
| afterPreparation.from, | ||
| afterPreparation.to, | ||
| afterPreparation.direction, | ||
| afterPreparation.navigationType, | ||
| afterPreparation.sourceElement, | ||
| afterPreparation.info, | ||
| afterPreparation.newDocument | ||
| ); | ||
| this.direction = afterPreparation.direction; | ||
| this.viewTransition = viewTransition; | ||
| this.swap = swap.bind(this, this); | ||
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| Object.defineProperties(this, { | ||
| direction: { enumerable: true }, | ||
| viewTransition: { enumerable: true }, | ||
| swap: { enumerable: true, writable: true }, | ||
| }); | ||
| } | ||
| } | ||
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| export async function doPreparation( | ||
| from: URL, | ||
| to: URL, | ||
| direction: Direction | string, | ||
| navigationType: NavigationTypeString, | ||
| sourceElement: Element | undefined, | ||
| info: any, | ||
| formData: FormData | undefined, | ||
| defaultLoader: (event: TransitionBeforePreparationEvent) => Promise<void> | ||
| ) { | ||
| const event = new TransitionBeforePreparationEvent( | ||
| from, | ||
| to, | ||
| direction, | ||
| navigationType, | ||
| sourceElement, | ||
| info, | ||
| window.document, | ||
| formData, | ||
| defaultLoader | ||
| ); | ||
| if (document.dispatchEvent(event)) { | ||
| await event.loader(); | ||
| if (!event.defaultPrevented) { | ||
| triggerEvent(TRANSITION_AFTER_PREPARATION); | ||
| if (event.navigationType !== 'traverse') { | ||
| // save the current scroll position before we change the DOM and transition to the new page | ||
| updateScrollPosition({ scrollX, scrollY }); | ||
| } | ||
| } | ||
| } | ||
| return event; | ||
| } | ||
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| export async function doSwap( | ||
| afterPreparation: BeforeEvent, | ||
| viewTransition: ViewTransition, | ||
| defaultSwap: (event: TransitionBeforeSwapEvent) => void | ||
| ) { | ||
| const event = new TransitionBeforeSwapEvent(afterPreparation, viewTransition, defaultSwap); | ||
| document.dispatchEvent(event); | ||
| event.swap(); | ||
| return event; | ||
| } |
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