From 46694aa97d4de83970fb2f44ca0b3f1b80a247ef Mon Sep 17 00:00:00 2001
From: yangfan229 <yangfan229@huawei.com>
Date: Wed, 30 Jul 2025 10:53:35 +0800
Subject: [PATCH] observer add tab content change

Signed-off-by: yangfan229 <yangfan229@huawei.com>
Change-Id: Ib440aaacaea978d13c716ff66948c8821c6a6cd2
---
 api/@ohos.arkui.observer.d.ts | 70 ++++++++++++++++++++++++++++++++++-
 1 file changed, 69 insertions(+), 1 deletion(-)

diff --git a/api/@ohos.arkui.observer.d.ts b/api/@ohos.arkui.observer.d.ts
index dcc34ce776..e2c0e5bdbd 100644
--- a/api/@ohos.arkui.observer.d.ts
+++ b/api/@ohos.arkui.observer.d.ts
@@ -717,7 +717,19 @@ declare namespace uiObserver {
      * @since arkts {'1.1':'12','1.2':'20'}
      * @arkts 1.1&1.2
      */
-    uniqueId: number
+    uniqueId: number,
+
+    /**
+     * The last focus index of TabContent in Tabs.
+     *
+     * @type { ?number }
+     * @syscap SystemCapability.ArkUI.ArkUI.Full
+     * @crossplatform
+     * @atomicservice
+     * @since 22
+     */
+    lastIndex?: number,
+
   }
 
     /**
@@ -1309,6 +1321,62 @@ declare namespace uiObserver {
    */
   export function off(type: 'didLayout', context: UIContext, callback?: Callback<void>): void;
 
+  /**
+   * Registers a callback function to be called when the tabContent is showed or hidden.
+   * Include the cases when the first tab content shows and when the tab changes current index.
+   *
+   * @param { 'tabChange' } type - The type of event to listen for. Must be 'tabChange'.
+   * @param { ObserverOptions } config - The options object. Includes the observed component id.
+   * @param { Callback<TabContentInfo> } callback - The callback function to be called
+   *     when when the tabContent is showed or hidden.
+   * @syscap SystemCapability.ArkUI.ArkUI.Full
+   * @crossplatform
+   * @atomicservice
+   * @since 22
+   */
+  export function on(type: 'tabChange', config: ObserverOptions, callback: Callback<TabContentInfo>): void;
+
+  /**
+   * Removes a callback function that was previously registered with `on()`.
+   *
+   * @param { 'tabChange' } type - The type of event to remove the listener for. Must be 'tabChange'.
+   * @param { ObserverOptions } config - The config object. Includes the observed component id.
+   * @param { Callback<TabContentInfo> } [callback] - The callback function to remove.
+   *     If not provided, all callbacks for the given event type and Tabs ID will be removed.
+   * @syscap SystemCapability.ArkUI.ArkUI.Full
+   * @crossplatform
+   * @atomicservice
+   * @since 22
+   */
+  export function off(type: 'tabChange', config: ObserverOptions, callback?: Callback<TabContentInfo>): void;
+
+  /**
+   * Registers a callback function to be called when the tabContent is showed or hidden.
+   * Include the cases when the first tab content shows and when the tab changes current index.
+   *
+   * @param { 'tabChange' } type - The type of event to listen for. Must be 'tabChange'.
+   * @param { Callback<TabContentInfo> } callback - The callback function to be called
+   *     when the tabContent is showed or hidden.
+   * @syscap SystemCapability.ArkUI.ArkUI.Full
+   * @crossplatform
+   * @atomicservice
+   * @since 22
+   */
+  export function on(type: 'tabChange', callback: Callback<TabContentInfo>): void;
+
+  /**
+   * Removes a callback function that was previously registered with `on()`.
+   *
+   * @param { 'tabChange' } type - The type of event to remove the listener for. Must be 'tabChange'.
+   * @param { Callback<TabContentInfo> } [callback] - The callback function to remove.
+   *     If not provided, all callbacks for the given event type will be removed.
+   * @syscap SystemCapability.ArkUI.ArkUI.Full
+   * @crossplatform
+   * @atomicservice
+   * @since 22
+   */
+  export function off(type: 'tabChange', callback?: Callback<TabContentInfo>): void;
+
   /**
    * Registers a callback function to be called when the tabContent is showed or hidden.
    *
-- 
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