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+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License"),
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file
+ * @kit ArkUI
+ * @arkts 1.2
+ */
+
+import { memo, ComponentBuilder, CommonMethod, Optional, ColorMetrics, Font, BlurStyle, LengthMetrics, Bindable } from '@ohos.arkui.component'; 
+
+/**
+ * Define the initialization parameters of the arc alphabet index bar
+ *
+ * @interface ArcAlphabetIndexerInitInfo
+ * @syscap SystemCapability.ArkUI.ArkUI.Circle
+ * @crossplatform
+ * @atomicservice
+ * @since 20
+ */
+export declare interface ArcAlphabetIndexerInitInfo {
+  /**
+   * Array of alphabetic indexed strings, cannot be set to empty.
+   *
+   * @type { string[] }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  arrayValue: string[];
+  /**
+   * The index value of the initial selected item.
+   *
+   * @type { number | Bindable<number> } - If it is out of the index range, the default value is 0
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  selected: number | Bindable<number>;
+}
+
+/**
+  * Callback when index bar is selected.
+  *
+  * @typedef { function } OnSelectCallback
+  * @param { number } index - the selected index
+  * @syscap SystemCapability.ArkUI.ArkUI.Circle
+  * @crossplatform
+  * @atomicservice
+  * @since 20
+  */
+export declare type OnSelectCallback = (index: number) => void;
+
+/**
+ * Defines the arc alphabet index bar attribute functions.
+ *
+ * @extends CommonMethod
+ * @interface ArcAlphabetIndexerAttribute
+ * @syscap SystemCapability.ArkUI.ArkUI.Circle
+ * @crossplatform
+ * @atomicservice
+ * @since 20
+ * @noninterop
+ */
+export declare interface ArcAlphabetIndexerAttribute extends CommonMethod {
+  /**
+   * Definitions text color.
+   *
+   * @param { Optional<ColorMetrics> } color
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  color(color: Optional<ColorMetrics>): this;
+
+  /**
+   * Selected text color.
+   *
+   * @param { Optional<ColorMetrics> } color
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  selectedColor(color: Optional<ColorMetrics>): this;
+
+  /**
+   * Font color of the pop-up prompt text.
+   *
+   * @param { Optional<ColorMetrics> } color
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  popupColor(color: Optional<ColorMetrics>): this;
+
+  /**
+   * Select the text background color.
+   *
+   * @param { Optional<ColorMetrics> } color
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  selectedBackgroundColor(color: Optional<ColorMetrics>): this;
+
+  /**
+   * Background color of the pop-up window.
+   *
+   * @param { Optional<ColorMetrics> } color
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  popupBackground(color: Optional<ColorMetrics>): this;
+
+  /**
+   * Whether to use pop-up index hints.
+   *
+   * @param { Optional<boolean> } enabled
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  usePopup(enabled: Optional<boolean>): this;
+
+  /**
+   * Selected text style.
+   *
+   * @param { Optional<Font> } font
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  selectedFont(font: Optional<Font>): this;
+
+  /**
+   * Popup text style.
+   *
+   * @param { Optional<Font> } font
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  popupFont(font: Optional<Font>): this;
+
+  /**
+   * Definitions fonts.
+   *
+   * @param { Optional<Font> } font
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  font(font: Optional<Font>): this;
+
+  /**
+   * Size of the letter area on the letter index bar. The letter area is a circle. Set the diameter of the circle.
+   *
+   * @param { Optional<LengthMetrics> } size
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  itemSize(size: Optional<LengthMetrics>): this;
+
+  /**
+   * Sets the selected index.
+   *
+   * @param { Optional<number> | Bindable<number> } index
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  selected(index: Optional<number> | Bindable<number>): this;
+
+  /**
+   * Automatically collapses the characters when the indexer bar not enough to display all characters.
+   *
+   * @param { Optional<boolean> } enable - A boolean value determines whether auto collapses is enabled for indexer bar.
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  autoCollapse(enable: Optional<boolean>): this;
+
+  /**
+   * Index bar selection callback.
+   *
+   * @param { Optional<OnSelectCallback> } handler
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  onSelect(handler: Optional<OnSelectCallback>): this;
+
+  /**
+   * Set the background blurStyle of the pop-up window.
+   *
+   * @param { Optional<BlurStyle> } style
+   * @returns { this }
+   * @syscap SystemCapability.ArkUI.ArkUI.Circle
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   */
+  popupBackgroundBlurStyle(style: Optional<BlurStyle>): this;
+}
+
+/**
+ * Defines ArcAlphabetIndexer Component.
+ *
+ * @param { ArcAlphabetIndexerInitInfo } info - The initialization parameters of the arc alphabet index bar
+ * @param { function } [content_]
+ * @returns { ArcAlphabetIndexerAttribute } - The attribute of the ArcAlphabetIndexer.
+ * @syscap SystemCapability.ArkUI.ArkUI.Circle
+ * @crossplatform
+ * @atomicservice
+ * @since 20
+ * @noninterop
+ */
+@memo
+@ComponentBuilder
+export declare function ArcAlphabetIndexer(
+    info: ArcAlphabetIndexerInitInfo,
+    @memo
+    content_?: () => void,
+): ArcAlphabetIndexerAttribute;