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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| /** | ||
| * @file Activity component | ||
| * | ||
| * This component is used to suspend the rendering of a subtree until a promise is resolved. | ||
| */ | ||
| import { unsafeWriteValue } from '#/utilities/write' | ||
| import { Suspense, useEffect, useLayoutEffect, useRef, useState } from 'react' | ||
| import { useAwait } from './Await' | ||
|
|
||
| /** | ||
| * Props for {@link Activity} | ||
| */ | ||
| export interface ActivityProps { | ||
| /** | ||
| * The mode of the activity. | ||
| * - `active`: The subtree is active (default). | ||
| * - `inactive`: The activity of the subtree is paused. | ||
| * - `inactive-hidden`: The activity of the subtree is paused, and the subtree is hidden. | ||
| * @default 'active' | ||
| */ | ||
| readonly mode: 'active' | 'inactive-hidden' | 'inactive' | ||
| readonly children: React.ReactNode | ||
| } | ||
|
|
||
| /** | ||
| * A component that pauses all activity inside it's subtree. | ||
| * | ||
| * --- | ||
| * ## The component is EXPERIMENTAL, please use with caution. | ||
| * --- | ||
| */ | ||
| export function Activity(props: ActivityProps) { | ||
| const { mode, children } = props | ||
|
|
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| const contentRef = useRef<HTMLDivElement>(null) | ||
|
|
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| const [promise, setPromise] = useState<Promise<void> | null>(null) | ||
|
|
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| const isActive = mode === 'active' | ||
| const fallback = | ||
| mode === 'inactive-hidden' ? null : <UnhideSuspendedTree contentRef={contentRef} /> | ||
|
|
||
| useEffect(() => { | ||
| if (isActive) { | ||
| return | ||
| } | ||
|
|
||
| let resolve = () => {} | ||
|
|
||
| setPromise( | ||
| new Promise((res) => { | ||
| resolve = res | ||
| }), | ||
| ) | ||
|
|
||
| return () => { | ||
| resolve() | ||
| setPromise(null) | ||
| } | ||
| }, [isActive]) | ||
|
|
||
| return ( | ||
| <div ref={contentRef} className="contents"> | ||
| <Suspense fallback={fallback}> | ||
| <ActivityInner promise={promise}>{children}</ActivityInner> | ||
| </Suspense> | ||
| </div> | ||
| ) | ||
| } | ||
|
|
||
| /** | ||
| * Props for {@link ActivityInner} | ||
| */ | ||
| interface ActivityInnerProps { | ||
| readonly children: React.ReactNode | ||
| readonly promise?: Promise<unknown> | null | undefined | ||
| } | ||
|
|
||
| /** | ||
| * A component that suspends the tree using promises. | ||
| * @param props - The props of the component. | ||
| * @returns The children of the component. | ||
| */ | ||
| function ActivityInner(props: ActivityInnerProps) { | ||
| const { promise, children } = props | ||
|
|
||
| // Suspend the subtree | ||
| useAwait(promise) | ||
|
|
||
| return children | ||
| } | ||
|
|
||
| /** | ||
| * Props for {@link UnhideSuspendedTree} | ||
| */ | ||
| interface UnhideSuspendedTreeProps { | ||
| readonly contentRef: React.RefObject<HTMLDivElement> | ||
| } | ||
|
|
||
| /** | ||
| * Hack, that unhides the suspended tree. | ||
| */ | ||
| function UnhideSuspendedTree(props: UnhideSuspendedTreeProps) { | ||
| const { contentRef } = props | ||
|
|
||
| useLayoutEffect(() => { | ||
| const element: HTMLDivElement | null = contentRef.current | ||
|
|
||
| if (element == null) { | ||
| return | ||
| } | ||
|
|
||
| const chidlren = element.childNodes | ||
|
|
||
| for (let i = 0; i < chidlren.length; i++) { | ||
| const child = chidlren[i] | ||
|
|
||
| if (child instanceof HTMLElement) { | ||
| unsafeWriteValue(child.style, 'display', '') | ||
| } | ||
| } | ||
| }, [contentRef]) | ||
|
|
||
| return null | ||
| } |
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