From ca28322700092e649f62078f5c54358a6921dad4 Mon Sep 17 00:00:00 2001
From: "Markus T." <19794318+marcus-wishes@users.noreply.github.com>
Date: Tue, 26 Nov 2024 13:39:51 +0100
Subject: [PATCH] time table - refactored update of groups

---
 .../components/timetable/TimeTableRows.tsx    | 90 +++++++++----------
 1 file changed, 44 insertions(+), 46 deletions(-)

diff --git a/library/src/components/timetable/TimeTableRows.tsx b/library/src/components/timetable/TimeTableRows.tsx
index d0f54bed..1fa1d067 100644
--- a/library/src/components/timetable/TimeTableRows.tsx
+++ b/library/src/components/timetable/TimeTableRows.tsx
@@ -225,59 +225,57 @@ export default function TimeTableRows<
 		entries.length,
 	])
 
-	//const currentGroupRows = useRef(groupRows)
-	const [currentGroupRows, setCurrentGroupRows] = useState(groupRows)
+	const currentGroupRows = useRef(groupRows)
+	//const [currentGroupRows, setCurrentGroupRows] = useState(groupRows)
 
 	// initial run
 	useEffect(() => {
-		setCurrentGroupRows((currentGroupRows) => {
-			if (!currentGroupRows) {
-				setCurrentGroupRows(groupRows)
-				setGroupRowsRenderedIdx(0)
-				groupRowsRenderedIdxRef.current = 0
-				console.info("TimeTable - all group rows updated")
-				return currentGroupRows
+		if (!currentGroupRows.current) {
+			currentGroupRows.current = groupRows
+			setGroupRowsRenderedIdx(0)
+			groupRowsRenderedIdxRef.current = 0
+			console.info("TimeTable - all group rows updated")
+			return
+		}
+		// determine when new ones start
+		let newOne = -1
+		const keys = Object.keys(currentGroupRows)
+		for (let i = 0; i < keys.length; i++) {
+			const key = keys[i]
+			if (!groupRows[key]) {
+				newOne = i
+				break
 			}
-			// determine when new ones start
-			let newOne = -1
-			const keys = Object.keys(currentGroupRows)
-			for (let i = 0; i < keys.length; i++) {
-				const key = keys[i]
-				if (!groupRows[key]) {
-					newOne = i
-					break
-				}
-				if (
-					(groupRows[key] !== currentGroupRows[key] &&
-						i >= renderCells.current[0] &&
-						i <= renderCells.current[1]) ||
-					groupRows[key]?.length !== currentGroupRows[key]?.length
-				) {
-					newOne = i
-					break
-				}
+			if (
+				(groupRows[key] !== currentGroupRows.current[key] &&
+					i >= renderCells.current[0] &&
+					i <= renderCells.current[1]) ||
+				groupRows[key]?.length !== currentGroupRows.current[key]?.length
+			) {
+				newOne = i
+				break
 			}
-			if (newOne === -1) {
-				if (keys.length === Object.keys(groupRows).length) {
-					console.info(
-						"TimeTable - group rows have no changes",
-						keys.length,
-					)
-					return currentGroupRows
-				}
-				newOne = keys.length
+		}
+		if (newOne === -1) {
+			if (keys.length === Object.keys(groupRows).length) {
+				console.info(
+					"TimeTable - group rows have no changes",
+					keys.length,
+				)
+				currentGroupRows.current = groupRows
+				return
 			}
-			// we need to render the new ones
-			setGroupRowsRenderedIdx((prev) => {
-				const ret = prev >= newOne ? newOne : prev
-				if (ret === newOne) {
-					allPlaceholderRendered.current = false
-				}
-				return ret
-			})
-			return groupRows
+			newOne = keys.length
+		}
+		// we need to render the new ones
+		setGroupRowsRenderedIdx((prev) => {
+			const ret = prev >= newOne ? newOne : prev
+			if (ret === newOne) {
+				allPlaceholderRendered.current = false
+			}
+			return ret
 		})
-
+		currentGroupRows.current = groupRows
 		//rateLimiterRendering(() => window.setTimeout(renderBatch, 0))
 	}, [groupRows])
 	//useEffect(handleIntersections, [])