From bce557cc2dc767628bed6aac87301a1be7c5431b Mon Sep 17 00:00:00 2001
From: rxliuli <rxliuli@gmail.com>
Date: Tue, 4 Nov 2025 05:03:50 +0800
Subject: init commit

---
 .../components/src/utils/getUpdatedFocusedIndex.ts | 25 ++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 shared/components/src/utils/getUpdatedFocusedIndex.ts

(limited to 'shared/components/src/utils/getUpdatedFocusedIndex.ts')

diff --git a/shared/components/src/utils/getUpdatedFocusedIndex.ts b/shared/components/src/utils/getUpdatedFocusedIndex.ts
new file mode 100644
index 0000000..ca2c765
--- /dev/null
+++ b/shared/components/src/utils/getUpdatedFocusedIndex.ts
@@ -0,0 +1,25 @@
+export function getUpdatedFocusedIndex(
+    incrementAmount: number,
+    currentFocusedIndex: number | null,
+    numberOfItems: number,
+): number {
+    const potentialFocusedIndex = incrementAmount + currentFocusedIndex;
+
+    if (incrementAmount > 0) {
+        if (currentFocusedIndex === null) {
+            return 0;
+        } else {
+            return potentialFocusedIndex >= numberOfItems
+                ? 0
+                : potentialFocusedIndex;
+        }
+    } else {
+        if (currentFocusedIndex === null) {
+            return numberOfItems - 1;
+        } else {
+            return potentialFocusedIndex < 0
+                ? numberOfItems - 1
+                : potentialFocusedIndex;
+        }
+    }
+}
-- 
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