|
| 1 | +/** |
| 2 | + * Scoped View Transitions plugin. |
| 3 | + * |
| 4 | + * Only triggers the View Transition API when navigating between `/` and `/search` |
| 5 | + * (the search-box morph animation). All other navigations are left untouched so |
| 6 | + * they feel instant. |
| 7 | + */ |
| 8 | +export default defineNuxtPlugin(nuxtApp => { |
| 9 | + if (!document.startViewTransition) return |
| 10 | + |
| 11 | + let transition: ViewTransition | undefined |
| 12 | + let finishTransition: (() => void) | undefined |
| 13 | + let hasUAVisualTransition = false |
| 14 | + |
| 15 | + const resetTransitionState = () => { |
| 16 | + transition = undefined |
| 17 | + finishTransition = undefined |
| 18 | + hasUAVisualTransition = false |
| 19 | + } |
| 20 | + |
| 21 | + // Respect browser-initiated visual transitions (e.g. swipe-back) |
| 22 | + window.addEventListener('popstate', event => { |
| 23 | + hasUAVisualTransition = |
| 24 | + (event as PopStateEvent & { hasUAVisualTransition?: boolean }).hasUAVisualTransition ?? false |
| 25 | + if (hasUAVisualTransition) { |
| 26 | + transition?.skipTransition() |
| 27 | + } |
| 28 | + }) |
| 29 | + |
| 30 | + const router = useRouter() |
| 31 | + |
| 32 | + router.beforeResolve(async (to, from) => { |
| 33 | + if (to.matched.length === 0) return |
| 34 | + |
| 35 | + const toPath = to.path |
| 36 | + const fromPath = from.path |
| 37 | + |
| 38 | + // Only transition between / and /search |
| 39 | + if (!isSearchTransition(toPath, fromPath)) return |
| 40 | + |
| 41 | + // Respect prefers-reduced-motion |
| 42 | + if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) return |
| 43 | + |
| 44 | + // Skip if browser already handled the visual transition |
| 45 | + if (hasUAVisualTransition) return |
| 46 | + |
| 47 | + const promise = new Promise<void>(resolve => { |
| 48 | + finishTransition = resolve |
| 49 | + }) |
| 50 | + |
| 51 | + let changeRoute: () => void |
| 52 | + const ready = new Promise<void>(resolve => (changeRoute = resolve)) |
| 53 | + |
| 54 | + transition = document.startViewTransition(() => { |
| 55 | + changeRoute!() |
| 56 | + return promise |
| 57 | + }) |
| 58 | + |
| 59 | + transition.finished.then(resetTransitionState) |
| 60 | + |
| 61 | + await nuxtApp.callHook('page:view-transition:start', transition) |
| 62 | + |
| 63 | + return ready |
| 64 | + }) |
| 65 | + |
| 66 | + // Abort on errors |
| 67 | + router.onError(() => { |
| 68 | + finishTransition?.() |
| 69 | + resetTransitionState() |
| 70 | + }) |
| 71 | + nuxtApp.hook('app:error', () => { |
| 72 | + finishTransition?.() |
| 73 | + resetTransitionState() |
| 74 | + }) |
| 75 | + nuxtApp.hook('vue:error', () => { |
| 76 | + finishTransition?.() |
| 77 | + resetTransitionState() |
| 78 | + }) |
| 79 | + |
| 80 | + // Finish when page render completes |
| 81 | + nuxtApp.hook('page:finish', () => { |
| 82 | + finishTransition?.() |
| 83 | + resetTransitionState() |
| 84 | + }) |
| 85 | +}) |
| 86 | + |
| 87 | +/** Return true when navigating between `/` and `/search` (either direction). */ |
| 88 | +function isSearchTransition(toPath: string, fromPath: string): boolean { |
| 89 | + const paths = new Set([toPath, fromPath]) |
| 90 | + return paths.has('/') && paths.has('/search') |
| 91 | +} |
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