| 1 | "use client"; |
| 2 | |
| 3 | import { useCallback, useEffect, useRef, useState } from "react"; |
| 4 | |
| 5 | interface UsePresentingLoadingGateOptions { |
| 6 | isPresenting: boolean; |
| 7 | isPresentingLoading: boolean; |
| 8 | slideIds: string[]; |
| 9 | presentingScaleLocks: Record<string, boolean>; |
| 10 | setIsPresentingLoading: (isLoading: boolean) => void; |
| 11 | clearDelayMs?: number; |
| 12 | } |
| 13 | |
| 14 | export function usePresentingLoadingGate({ |
| 15 | isPresenting, |
| 16 | isPresentingLoading, |
| 17 | slideIds, |
| 18 | presentingScaleLocks, |
| 19 | setIsPresentingLoading, |
| 20 | clearDelayMs = 150, |
| 21 | }: UsePresentingLoadingGateOptions) { |
| 22 | const [isLayoutStable, setIsLayoutStable] = useState(false); |
| 23 | const clearLoadingTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>( |
| 24 | null, |
| 25 | ); |
| 26 | |
| 27 | const cancelClearLoading = useCallback(() => { |
| 28 | if (clearLoadingTimeoutRef.current) { |
| 29 | clearTimeout(clearLoadingTimeoutRef.current); |
| 30 | clearLoadingTimeoutRef.current = null; |
| 31 | } |
| 32 | }, []); |
| 33 | |
| 34 | useEffect(() => { |
| 35 | if (!isPresenting || !isPresentingLoading) { |
| 36 | setIsLayoutStable(false); |
| 37 | cancelClearLoading(); |
| 38 | return; |
| 39 | } |
| 40 | |
| 41 | let rafId = 0; |
| 42 | let stableFrames = 0; |
| 43 | let lastWidth = 0; |
| 44 | let lastHeight = 0; |
| 45 | |
| 46 | const measure = () => { |
| 47 | const container = document.querySelector<HTMLElement>( |
| 48 | ".presentation-slides", |
| 49 | ); |
| 50 | |
| 51 | if (container) { |
| 52 | const width = Math.max(container.scrollWidth, container.clientWidth); |
| 53 | const height = Math.max(container.scrollHeight, container.clientHeight); |
| 54 | |
| 55 | if (width === lastWidth && height === lastHeight) { |
| 56 | stableFrames += 1; |
| 57 | } else { |
| 58 | stableFrames = 0; |
| 59 | lastWidth = width; |
| 60 | lastHeight = height; |
| 61 | } |
| 62 | |
| 63 | if (stableFrames >= 2) { |
| 64 | setIsLayoutStable(true); |
| 65 | return; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | rafId = window.requestAnimationFrame(measure); |
| 70 | }; |
| 71 | |
| 72 | rafId = window.requestAnimationFrame(measure); |
| 73 | return () => { |
| 74 | if (rafId) { |
| 75 | window.cancelAnimationFrame(rafId); |
| 76 | } |
| 77 | }; |
| 78 | }, [cancelClearLoading, isPresenting, isPresentingLoading, slideIds.length]); |
| 79 | |
| 80 | useEffect(() => { |
| 81 | if (!isPresenting || !isPresentingLoading) return; |
| 82 | |
| 83 | const allLocked = slideIds.length |
| 84 | ? slideIds.every((slideId) => presentingScaleLocks[slideId]) |
| 85 | : true; |
| 86 | const shouldClearLoading = allLocked && isLayoutStable; |
| 87 | |
| 88 | if (!shouldClearLoading) { |
| 89 | cancelClearLoading(); |
| 90 | return; |
| 91 | } |
| 92 | |
| 93 | cancelClearLoading(); |
| 94 | clearLoadingTimeoutRef.current = setTimeout(() => { |
| 95 | setIsPresentingLoading(false); |
| 96 | }, clearDelayMs); |
| 97 | }, [ |
| 98 | cancelClearLoading, |
| 99 | clearDelayMs, |
| 100 | isLayoutStable, |
| 101 | isPresenting, |
| 102 | isPresentingLoading, |
| 103 | presentingScaleLocks, |
| 104 | setIsPresentingLoading, |
| 105 | slideIds, |
| 106 | ]); |
| 107 | } |
| 108 |