[Fabric] Implement announceForAccessibility in AccessibilityInfo Module

change/react-native-windows-b93a8310-8489-4f09-8497-eb5807c505b9.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "[Fabric] Implement announceForAccessibility in AccessibilityInfo Module",
+  "packageName": "react-native-windows",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

vnext/Microsoft.ReactNative/Fabric/Composition/ReactNativeIsland.cpp

@@ -40,6 +40,14 @@
 
 namespace winrt::Microsoft::ReactNative::implementation {
 
+ReactPropertyId<winrt::Microsoft::ReactNative::ReactNonAbiValue<
+    winrt::weak_ref<winrt::Microsoft::ReactNative::implementation::ReactNativeIsland>>>
+ReactNativeIsland::LastFocusedReactNativeIslandProperty() noexcept {
+  static const ReactPropertyId<winrt::Microsoft::ReactNative::ReactNonAbiValue<
+      winrt::weak_ref<winrt::Microsoft::ReactNative::implementation::ReactNativeIsland>>>
+      prop{L"ReactNative.Composition", L"ReactNativeIsland"};
+  return prop;
+}
 constexpr float loadingActivitySize = 12.0f;
 constexpr float loadingActivityHorizontalOffset = 16.0f;
 constexpr float loadingBarHeight = 36.0f;
@@ -861,6 +869,20 @@ winrt::Microsoft::UI::Content::ContentIsland ReactNativeIsland::Island() {
             }
           }
         });
+    focusController.GotFocus(
+        [weakThis = get_weak()](const auto &sender, const winrt::Microsoft::UI::Input::FocusChangedEventArgs &args) {
+          if (auto pThis = weakThis.get()) {
+            // Set the island to React context so it can be accessed by native modules
+            if (pThis->m_context && pThis->m_island) {
+              auto properties = pThis->m_context.Properties();
+              properties.Set(
+                  ReactNativeIsland::LastFocusedReactNativeIslandProperty(),
+                  winrt::Microsoft::ReactNative::ReactNonAbiValue<
+                      winrt::weak_ref<winrt::Microsoft::ReactNative::implementation::ReactNativeIsland>>{
+                      std::in_place, weakThis});
+            }
+          }
+        });
 
     // ContentIsland does not support weak_ref, so we cannot use auto_revoke for these events
     m_islandAutomationProviderRequestedToken = m_island.AutomationProviderRequested(

vnext/Microsoft.ReactNative/Fabric/Composition/ReactNativeIsland.h

@@ -49,6 +49,9 @@ struct ReactNativeIsland
   ~ReactNativeIsland() noexcept;
 
   ReactNativeIsland(const winrt::Microsoft::UI::Composition::Compositor &compositor) noexcept;
+  static ReactPropertyId<winrt::Microsoft::ReactNative::ReactNonAbiValue<
+      winrt::weak_ref<winrt::Microsoft::ReactNative::implementation::ReactNativeIsland>>>
+  LastFocusedReactNativeIslandProperty() noexcept;
   ReactNativeIsland(const winrt::Microsoft::ReactNative::Composition::PortalComponentView &portal) noexcept;
 
   static winrt::Microsoft::ReactNative::ReactNativeIsland CreatePortal(

vnext/Microsoft.ReactNative/Modules/AccessibilityInfoModule.cpp

@@ -7,6 +7,8 @@
 #include <UI.Xaml.Automation.Peers.h>
 #include <UI.Xaml.Controls.h>
 #include <XamlUtils.h>
+#else
+#include <Fabric/Composition/ReactNativeIsland.h>
 #endif
 #include <uiautomationcore.h>
 #include <uiautomationcoreapi.h>
@@ -79,6 +81,33 @@ void AccessibilityInfo::announceForAccessibility(std::wstring announcement) noex
         xaml::Automation::Peers::AutomationNotificationProcessing::ImportantMostRecent,
         hstr,
         hstr);
+#else
+    if (auto weakIslandWrapper = context.Properties().Get(
+            winrt::Microsoft::ReactNative::implementation::ReactNativeIsland::LastFocusedReactNativeIslandProperty())) {
+      if (auto weakIsland = weakIslandWrapper.Value()) {
+        if (auto reactNativeIsland = weakIsland.get()) {
+          if (auto uiaprovider = reactNativeIsland->GetUiaProvider()) {
+            if (auto rawProvider = uiaprovider.try_as<IRawElementProviderSimple>()) {
+              // Convert announcement to BSTR for UIA
+              winrt::hstring hstrAnnouncement{announcement};
+              auto bstrAnnouncement = SysAllocString(hstrAnnouncement.c_str());
+              if (bstrAnnouncement) {
+                // Raise the UIA notification event
+                HRESULT hr = UiaRaiseNotificationEvent(
+                    rawProvider.get(),
+                    NotificationKind_Other,
+                    NotificationProcessing_ImportantMostRecent,
+                    bstrAnnouncement,
+                    bstrAnnouncement);
+                // Clean up BSTRs
+                SysFreeString(bstrAnnouncement);
+              }
+            }
+          }
+        }
+      }
+    }
+
 #endif
   });
 }