| 1 | "use client"; |
| 2 | |
| 3 | import { type Value } from "platejs"; |
| 4 | import { type PlateEditor } from "platejs/react"; |
| 5 | import { useEffect, useRef } from "react"; |
| 6 | |
| 7 | interface UseHistoryGuardArgs { |
| 8 | editor: PlateEditor; |
| 9 | initialContent?: { content?: Value; id?: string } | null; |
| 10 | isGenerating: boolean; |
| 11 | readOnly: boolean; |
| 12 | isPresenting: boolean; |
| 13 | currentSlideId: string | null; |
| 14 | lastContentRef: React.MutableRefObject<string>; |
| 15 | } |
| 16 | |
| 17 | /** |
| 18 | * Simplified history guard - syncs editor state when slide content changes externally. |
| 19 | * No longer needs to track "applying history" since we use type='history' in state. |
| 20 | */ |
| 21 | export function useHistoryGuard({ |
| 22 | editor, |
| 23 | initialContent, |
| 24 | isGenerating, |
| 25 | readOnly, |
| 26 | isPresenting, |
| 27 | currentSlideId, |
| 28 | lastContentRef, |
| 29 | }: UseHistoryGuardArgs) { |
| 30 | const lastSyncedIdRef = useRef<string | null>(null); |
| 31 | |
| 32 | // Handle content updates during generation |
| 33 | useEffect(() => { |
| 34 | if (isGenerating && initialContent?.content) { |
| 35 | requestAnimationFrame(() => { |
| 36 | editor.tf.setValue(initialContent.content); |
| 37 | lastContentRef.current = JSON.stringify(initialContent.content); |
| 38 | }); |
| 39 | } |
| 40 | }, [initialContent?.content, isGenerating, editor, lastContentRef]); |
| 41 | |
| 42 | // Handle external updates (from undo/redo or other sources) |
| 43 | useEffect(() => { |
| 44 | if (!initialContent?.content || isGenerating || readOnly || isPresenting) { |
| 45 | return; |
| 46 | } |
| 47 | |
| 48 | const newContentString = JSON.stringify(initialContent.content); |
| 49 | const currentContentString = JSON.stringify(editor.children); |
| 50 | |
| 51 | // Skip if content hasn't changed or matches what we last synced |
| 52 | if ( |
| 53 | newContentString === lastContentRef.current || |
| 54 | newContentString === currentContentString |
| 55 | ) { |
| 56 | return; |
| 57 | } |
| 58 | |
| 59 | // Content changed externally - sync editor |
| 60 | const isCurrentSlide = initialContent?.id === currentSlideId; |
| 61 | const savedSelection = isCurrentSlide ? editor.selection : null; |
| 62 | |
| 63 | requestAnimationFrame(() => { |
| 64 | editor.tf.setValue(initialContent.content); |
| 65 | lastContentRef.current = newContentString; |
| 66 | lastSyncedIdRef.current = initialContent?.id ?? null; |
| 67 | |
| 68 | // Restore cursor if this is the active slide |
| 69 | if (savedSelection && isCurrentSlide) { |
| 70 | requestAnimationFrame(() => { |
| 71 | try { |
| 72 | editor.tf.select(savedSelection, { edge: "end" }); |
| 73 | editor.tf.focus(); |
| 74 | } catch { |
| 75 | editor.tf.focus(); |
| 76 | } |
| 77 | }); |
| 78 | } |
| 79 | }); |
| 80 | }, [ |
| 81 | initialContent?.content, |
| 82 | initialContent?.id, |
| 83 | editor, |
| 84 | isGenerating, |
| 85 | readOnly, |
| 86 | isPresenting, |
| 87 | currentSlideId, |
| 88 | lastContentRef, |
| 89 | ]); |
| 90 | } |
| 91 |