Implement IValueProvider

change/react-native-windows-008fe6b2-a10c-4b12-b46e-00415bf35fce.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "value provider changes",
+  "packageName": "react-native-windows",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

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

@@ -137,6 +137,7 @@ HRESULT __stdcall CompositionDynamicAutomationProvider::GetPatternProvider(PATTE
   if (props == nullptr)
     return UIA_E_ELEMENTNOTAVAILABLE;
   auto accessibilityRole = props->accessibilityRole;
+  auto accessibilityValue = props->accessibilityValue;
   // Invoke control pattern is used to support controls that do not maintain state
   // when activated but rather initiate or perform a single, unambiguous action.
   if (patternId == UIA_InvokePatternId &&
@@ -147,6 +148,11 @@ HRESULT __stdcall CompositionDynamicAutomationProvider::GetPatternProvider(PATTE
     AddRef();
   }
 
+  if (patternId == UIA_ValuePatternId && accessibilityValue.text.has_value()) {
+    *pRetVal = static_cast<IValueProvider *>(this);
+    AddRef();
+  }
+
   return S_OK;
 }
 
@@ -327,4 +333,53 @@ HRESULT __stdcall CompositionDynamicAutomationProvider::Invoke() {
   return S_OK;
 }
 
+BSTR StringToBSTR(const std::string &str) {
+  // Calculate the required BSTR size in bytes
+  int len = MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, nullptr, 0);
+  if (len == 0) {
+    return nullptr; // Conversion error
+  }
+
+  // Allocate memory for the BSTR
+  BSTR bstr = SysAllocStringLen(nullptr, len - 1); // len includes the null terminator
+
+  // Convert the std::string to BSTR
+  MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, bstr, len);
+
+  return bstr;
+}
+
+HRESULT __stdcall CompositionDynamicAutomationProvider::SetValue(LPCWSTR val) {
+  auto strongView = m_view.view();
+
+  if (!strongView)
+    return UIA_E_ELEMENTNOTAVAILABLE;
+
+  auto props = std::static_pointer_cast<const facebook::react::ViewProps>(strongView->props());
+  std::string value = winrt::to_string(val);
+  auto baseView = std::static_pointer_cast<::Microsoft::ReactNative::CompositionBaseComponentView>(strongView);
+  if (baseView == nullptr)
+    return UIA_E_ELEMENTNOTAVAILABLE;
+  baseView->updateAccessibilityValue(value);
+  return S_OK;
+}
+
+HRESULT __stdcall CompositionDynamicAutomationProvider::get_Value(BSTR *pRetVal) {
+  if (pRetVal == nullptr)
+    return E_POINTER;
+  auto strongView = m_view.view();
+
+  if (!strongView)
+    return UIA_E_ELEMENTNOTAVAILABLE;
+
+  auto props = std::static_pointer_cast<const facebook::react::ViewProps>(strongView->props());
+  *pRetVal = StringToBSTR(*props->accessibilityValue.text);
+
+  return S_OK;
+}
+
+HRESULT __stdcall CompositionDynamicAutomationProvider::get_IsReadOnly(BOOL *pRetVal) {
+  return S_OK;
+}
+
 } // namespace winrt::Microsoft::ReactNative::implementation

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

@@ -13,7 +13,8 @@ class CompositionDynamicAutomationProvider : public winrt::implements<
                                                  IInspectable,
                                                  IRawElementProviderFragment,
                                                  IRawElementProviderSimple,
-                                                 IInvokeProvider> {
+                                                 IInvokeProvider,
+                                                 IValueProvider> {
  public:
   CompositionDynamicAutomationProvider(
       const std::shared_ptr<::Microsoft::ReactNative::CompositionBaseComponentView> &componentView) noexcept;
@@ -36,8 +37,13 @@ class CompositionDynamicAutomationProvider : public winrt::implements<
   // inherited via IInvokeProvider
   virtual HRESULT __stdcall Invoke() override;
 
+  // inherited via IValueProvider
+  virtual HRESULT __stdcall SetValue(LPCWSTR val) override;
+  virtual HRESULT __stdcall get_Value(BSTR *pRetVal) override;
+  virtual HRESULT __stdcall get_IsReadOnly(BOOL *pRetVal) override;
+
  private:
   ::Microsoft::ReactNative::ReactTaggedView m_view;
 };
 
-} // namespace winrt::Microsoft::ReactNative::implementation
+} // namespace winrt::Microsoft::ReactNative::implementation

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

@@ -1305,6 +1305,17 @@ void CompositionBaseComponentView::EnsureTransformMatrixFacade() noexcept {
   }
 }
 
+void CompositionBaseComponentView::updateAccessibilityValue(std::string newValue) noexcept {
+  auto props = std::static_pointer_cast<const facebook::react::ViewProps>(this->props());
+  if (newValue != props->accessibilityValue.text) {
+    auto provider = EnsureUiaProvider();
+    if (provider != nullptr) {
+      winrt::Microsoft::ReactNative::implementation::UpdateUiaProperty(
+          provider, UIA_ValueValuePropertyId, *props->accessibilityValue.text, newValue);
+    }
+  }
+}
+
 facebook::react::SharedViewEventEmitter CompositionBaseComponentView::eventEmitter() noexcept {
   return m_eventEmitter;
 }
@@ -1387,6 +1398,12 @@ void CompositionViewComponentView::updateProps(
     m_visual.Opacity(newViewProps.opacity);
   }
 
+  if (oldViewProps.accessibilityValue.text.has_value() &&
+      newViewProps.accessibilityValue.text.has_value() &&
+      oldViewProps.accessibilityValue.text != newViewProps.accessibilityValue.text) {
+    updateAccessibilityValue(*newViewProps.accessibilityValue.text);
+  }
+
   // update BaseComponentView props
   updateAccessibilityProps(oldViewProps, newViewProps);
   updateShadowProps(oldViewProps, newViewProps, m_visual);

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

@@ -35,6 +35,7 @@ struct CompositionBaseComponentView : public IComponentView,
   bool runOnChildren(bool forward, Mso::Functor<bool(IComponentView &)> &fn) noexcept override;
   void onFocusLost() noexcept override;
   void onFocusGained() noexcept override;
+  void updateAccessibilityValue(std::string newValue) noexcept;
   void onPointerEntered(
       const winrt::Microsoft::ReactNative::Composition::Input::PointerRoutedEventArgs &args) noexcept override;
   void onPointerExited(