Reader hotkeys

src/modules/core/utils/ValueRotationButton.utils.ts

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+export const getNextRotationValue = <Value>(
+    indexOfValue: number,
+    values: Value[],
+    isDefaultable?: boolean,
+): Value | undefined => {
+    const nextValueIndex = (indexOfValue + 1) % values.length;
+    const wasLastValue = nextValueIndex === 0;
+
+    const isDefaultNextValue = !!isDefaultable && wasLastValue;
+    if (isDefaultNextValue) {
+        return undefined;
+    }
+
+    return values[(indexOfValue + 1) % values.length];
+};