Support UIA ::SetFocus and basic property change notifications

change/react-native-windows-67407575-cd5b-4bf1-b812-6e0d80d943c3.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Add UIA focus management and AdvisedEvents for prop changes",
+  "packageName": "react-native-windows",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

packages/playground/windows/playground-composition/Playground-Composition.cpp

@@ -486,7 +486,7 @@ LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
     case WM_GETOBJECT: {
       if (lparam == UiaRootObjectId) {
         auto windowData = WindowData::GetFromWindow(hwnd);
-        if (!windowData->m_windowInited)
+        if (windowData == nullptr || !windowData->m_windowInited)
           break;
 
         auto hwndHost = windowData->m_CompositionHwndHost;

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

@@ -1,12 +1,7 @@
 #include "pch.h"
 #include "CompositionDynamicAutomationProvider.h"
 #include <Fabric/ComponentView.h>
-#pragma warning(push)
-#pragma warning(disable : 4229)
-#define IN
-#define OUT
-#include <atlsafe.h>
-#pragma warning(pop)
+#include <Unicode.h>
 #include "RootComponentView.h"
 #include "UiaHelpers.h"
 
@@ -41,16 +36,15 @@ HRESULT __stdcall CompositionDynamicAutomationProvider::GetRuntimeId(SAFEARRAY *
   if (!strongView)
     return UIA_E_ELEMENTNOTAVAILABLE;
 
-  CComSafeArray<int32_t> runtimeId;
-  auto hr = runtimeId.Create(2);
+  *pRetVal = SafeArrayCreateVector(VT_I4, 0, 2);
 
-  if (FAILED(hr))
-    return hr;
+  if (*pRetVal == nullptr)
+    return E_OUTOFMEMORY;
 
-  runtimeId[0] = UiaAppendRuntimeId;
-  runtimeId[1] = strongView->tag();
-
-  *pRetVal = runtimeId.Detach();
+  int runtimeId[] = {UiaAppendRuntimeId, strongView->tag()};
+  for (long i = 0; i < 2; i++) {
+    SafeArrayPutElement(*pRetVal, &i, static_cast<void *>(&runtimeId[i]));
+  }
 
   return S_OK;
 }
@@ -96,7 +90,7 @@ HRESULT __stdcall CompositionDynamicAutomationProvider::GetEmbeddedFragmentRoots
 }
 
 HRESULT __stdcall CompositionDynamicAutomationProvider::SetFocus(void) {
-  return S_OK;
+  return UiaSetFocusHelper(m_view);
 }
 
 HRESULT __stdcall CompositionDynamicAutomationProvider::get_FragmentRoot(IRawElementProviderFragmentRoot **pRetVal) {
@@ -211,6 +205,8 @@ HRESULT __stdcall CompositionDynamicAutomationProvider::GetPropertyValue(PROPERT
   if (props == nullptr)
     return UIA_E_ELEMENTNOTAVAILABLE;
 
+  auto hr = S_OK;
+
   switch (propertyId) {
     case UIA_ControlTypePropertyId: {
       pRetVal->vt = VT_I4;
@@ -220,21 +216,40 @@ HRESULT __stdcall CompositionDynamicAutomationProvider::GetPropertyValue(PROPERT
     }
     case UIA_AutomationIdPropertyId: {
       pRetVal->vt = VT_BSTR;
-      auto testId = props->testId;
-      CComBSTR temp(testId.c_str());
-      pRetVal->bstrVal = temp.Detach();
+      auto wideTestId = ::Microsoft::Common::Unicode::Utf8ToUtf16(props->testId);
+      pRetVal->bstrVal = SysAllocString(wideTestId.c_str());
+      hr = pRetVal->bstrVal != nullptr ? S_OK : E_OUTOFMEMORY;
       break;
     }
     case UIA_NamePropertyId: {
       pRetVal->vt = VT_BSTR;
-      auto name = props->accessibilityLabel;
-      CComBSTR temp(name.c_str());
-      pRetVal->bstrVal = temp.Detach();
+      auto wideName = ::Microsoft::Common::Unicode::Utf8ToUtf16(props->accessibilityLabel);
+      pRetVal->bstrVal = SysAllocString(wideName.c_str());
+      hr = pRetVal->bstrVal != nullptr ? S_OK : E_OUTOFMEMORY;
+      break;
+    }
+    case UIA_IsKeyboardFocusablePropertyId: {
+      pRetVal->vt = VT_BOOL;
+      pRetVal->boolVal = props->focusable ? VARIANT_TRUE : VARIANT_FALSE;
+      break;
+    }
+    case UIA_HasKeyboardFocusPropertyId: {
+      auto rootCV = strongView->rootComponentView();
+      if (rootCV == nullptr)
+        return UIA_E_ELEMENTNOTAVAILABLE;
+
+      pRetVal->vt = VT_BOOL;
+      pRetVal->boolVal = rootCV->GetFocusedComponent() == strongView.get() ? VARIANT_TRUE : VARIANT_FALSE;
+      break;
+    }
+    case UIA_IsEnabledPropertyId: {
+      pRetVal->vt = VT_BOOL;
+      pRetVal->boolVal = !props->accessibilityState.disabled ? VARIANT_TRUE : VARIANT_FALSE;
       break;
     }
   }
 
-  return S_OK;
+  return hr;
 }
 
 HRESULT __stdcall CompositionDynamicAutomationProvider::get_HostRawElementProvider(

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

@@ -1,5 +1,6 @@
 #include "pch.h"
 #include "CompositionRootAutomationProvider.h"
+#include <algorithm>
 #include "UiaHelpers.h"
 
 namespace winrt::Microsoft::ReactNative::implementation {
@@ -32,7 +33,7 @@ HRESULT __stdcall CompositionRootAutomationProvider::GetEmbeddedFragmentRoots(SA
 }
 
 HRESULT __stdcall CompositionRootAutomationProvider::SetFocus(void) {
-  return S_OK;
+  return UiaSetFocusHelper(m_view);
 }
 
 HRESULT __stdcall CompositionRootAutomationProvider::GetPatternProvider(PATTERNID patternId, IUnknown **pRetVal) {
@@ -122,10 +123,7 @@ HRESULT __stdcall CompositionRootAutomationProvider::ElementProviderFromPoint(
     return UIA_E_ELEMENTNOTAVAILABLE;
   }
 
-  auto spRootView = strongView->rootComponentView();
-  if (spRootView == nullptr) {
-    return UIA_E_ELEMENTNOTAVAILABLE;
-  }
+  auto spRootView = std::static_pointer_cast<::Microsoft::ReactNative::RootComponentView>(strongView);
 
   if (m_hwnd == nullptr || !IsWindow(m_hwnd)) {
     // TODO: Add support for non-HWND based hosting
@@ -189,4 +187,156 @@ HRESULT __stdcall CompositionRootAutomationProvider::Navigate(
   return S_OK;
 }
 
+// RAII wrapper to unaccess SafeArray data so I can early return in the relevant functions
+class SafeArrayAccessScope {
+  SAFEARRAY *m_pArray = nullptr;
+
+ public:
+  SafeArrayAccessScope(SAFEARRAY *psa) noexcept : m_pArray(psa) {}
+  ~SafeArrayAccessScope() noexcept {
+    if (m_pArray != nullptr)
+      SafeArrayUnaccessData(m_pArray);
+  }
+};
+
+void AdviseEventAddedImpl(
+    std::vector<CompositionRootAutomationProvider::AdvisedEvent> &advisedEvents,
+    EVENTID idEvent) noexcept {
+  auto it = std::find_if(
+      advisedEvents.begin(),
+      advisedEvents.end(),
+      [idEvent](const CompositionRootAutomationProvider::AdvisedEvent &ae) noexcept { return ae.Event == idEvent; });
+
+  if (it == advisedEvents.end()) {
+    advisedEvents.emplace_back(CompositionRootAutomationProvider::AdvisedEvent{idEvent, 1 /*Count*/});
+  } else {
+    it->Count++;
+  }
+}
+
+HRESULT CompositionRootAutomationProvider::AdvisePropertiesAdded(SAFEARRAY *psaProperties) noexcept {
+  if (psaProperties == nullptr)
+    return E_POINTER;
+
+  long *pValues = nullptr;
+  auto hr = SafeArrayAccessData(psaProperties, reinterpret_cast<void **>(&pValues));
+  if (FAILED(hr))
+    return hr;
+
+  SafeArrayAccessScope accessScope(psaProperties);
+
+  if (SafeArrayGetDim(psaProperties) != 1)
+    return E_INVALIDARG;
+
+  VARTYPE vt;
+  hr = SafeArrayGetVartype(psaProperties, &vt);
+  if (FAILED(hr) || vt != VT_I4)
+    return E_INVALIDARG;
+
+  long lower;
+  hr = SafeArrayGetLBound(psaProperties, 1, &lower);
+  if (FAILED(hr))
+    return hr;
+
+  long upper;
+  hr = SafeArrayGetUBound(psaProperties, 1, &upper);
+  if (FAILED(hr))
+    return hr;
+
+  long count = upper - lower + 1;
+
+  for (int i = 0; i < count; i++) {
+    AdviseEventAddedImpl(m_advisedProperties, pValues[i]);
+  }
+  return S_OK;
+}
+
+HRESULT CompositionRootAutomationProvider::AdviseEventAdded(EVENTID idEvent, SAFEARRAY *psaProperties) {
+  if (idEvent == UIA_AutomationPropertyChangedEventId) {
+    return AdvisePropertiesAdded(psaProperties);
+  }
+  AdviseEventAddedImpl(m_advisedEvents, idEvent);
+  return S_OK;
+}
+
+HRESULT AdviseEventRemovedImpl(
+    std::vector<CompositionRootAutomationProvider::AdvisedEvent> &advisedEvents,
+    EVENTID idEvent) noexcept {
+  auto it = std::find_if(
+      advisedEvents.begin(),
+      advisedEvents.end(),
+      [idEvent](const CompositionRootAutomationProvider::AdvisedEvent &ae) noexcept { return ae.Event == idEvent; });
+
+  if (it == advisedEvents.end()) {
+    assert(false);
+    return UIA_E_INVALIDOPERATION;
+  } else if (it->Count == 1) {
+    advisedEvents.erase(it);
+  } else {
+    it->Count--;
+  }
+  return S_OK;
+}
+
+HRESULT CompositionRootAutomationProvider::AdvisePropertiesRemoved(SAFEARRAY *psaProperties) noexcept {
+  if (psaProperties == nullptr)
+    return E_POINTER;
+
+  long *pValues = nullptr;
+  auto hr = SafeArrayAccessData(psaProperties, reinterpret_cast<void **>(&pValues));
+  if (FAILED(hr))
+    return hr;
+
+  SafeArrayAccessScope accessScope(psaProperties);
+
+  if (SafeArrayGetDim(psaProperties) != 1)
+    return E_INVALIDARG;
+
+  VARTYPE vt;
+  hr = SafeArrayGetVartype(psaProperties, &vt);
+  if (FAILED(hr) || vt != VT_I4)
+    return E_INVALIDARG;
+
+  long lower;
+  hr = SafeArrayGetLBound(psaProperties, 1, &lower);
+  if (FAILED(hr))
+    return hr;
+
+  long upper;
+  hr = SafeArrayGetUBound(psaProperties, 1, &upper);
+  if (FAILED(hr))
+    return hr;
+
+  long count = upper - lower + 1;
+  auto returnHr = S_OK;
+  for (int i = 0; i < count; i++) {
+    auto hr = AdviseEventRemovedImpl(m_advisedProperties, pValues[i]);
+    if (FAILED(hr)) {
+      returnHr = hr;
+    }
+  }
+  return returnHr;
+}
+
+HRESULT
+CompositionRootAutomationProvider::AdviseEventRemoved(EVENTID idEvent, SAFEARRAY *psaProperties) {
+  if (idEvent == UIA_AutomationPropertyChangedEventId) {
+    return AdvisePropertiesRemoved(psaProperties);
+  }
+
+  return AdviseEventRemovedImpl(m_advisedEvents, idEvent);
+}
+
+bool CompositionRootAutomationProvider::WasEventAdvised(EVENTID event) noexcept {
+  return std::any_of(m_advisedEvents.begin(), m_advisedEvents.end(), [event](const AdvisedEvent &ae) {
+    return ae.Event == event && ae.Count > 0;
+  });
+}
+
+bool CompositionRootAutomationProvider::WasPropertyAdvised(PROPERTYID prop) noexcept {
+  return std::any_of(m_advisedProperties.begin(), m_advisedProperties.end(), [prop](const AdvisedEvent &ae) {
+    return ae.Property == prop && ae.Count > 0;
+  });
+}
+
 } // namespace winrt::Microsoft::ReactNative::implementation

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

@@ -13,7 +13,8 @@ class CompositionRootAutomationProvider : public winrt::implements<
                                               IInspectable,
                                               IRawElementProviderFragmentRoot,
                                               IRawElementProviderFragment,
-                                              IRawElementProviderSimple> {
+                                              IRawElementProviderSimple,
+                                              IRawElementProviderAdviseEvents> {
  public:
   // inherited via IRawElementProviderFragmentRoot
   virtual HRESULT __stdcall ElementProviderFromPoint(double x, double y, IRawElementProviderFragment **pRetVal)
@@ -34,11 +35,39 @@ class CompositionRootAutomationProvider : public winrt::implements<
   virtual HRESULT __stdcall GetPropertyValue(PROPERTYID propertyId, VARIANT *pRetVal) override;
   virtual HRESULT __stdcall get_HostRawElementProvider(IRawElementProviderSimple **pRetVal) override;
 
+  // IRawElementProviderAdviseEvents
+  virtual HRESULT __stdcall AdviseEventAdded(EVENTID idEvent, SAFEARRAY *psaProperties) override;
+  virtual HRESULT __stdcall AdviseEventRemoved(EVENTID idEvent, SAFEARRAY *psaProperties) override;
+
   CompositionRootAutomationProvider(
       const std::shared_ptr<::Microsoft::ReactNative::RootComponentView> &componentView) noexcept;
+
   void SetHwnd(HWND hwnd) noexcept;
+  bool WasPropertyAdvised(PROPERTYID prop) noexcept;
+  bool WasEventAdvised(EVENTID event) noexcept;
+
+  // It's unlikely for the underlying primitive types for EVENTID and PROPERTYID to ever change, but let's make sure
+  static_assert(std::is_same<EVENTID, PROPERTYID>::value);
+  // Helper class for AdviseEventAdded/Removed. I could've simply used a std::pair, but I find using structs with named
+  // members easier to read and more self-documenting than pair.first and pair.last. Since this is simply syntactic
+  // sugar, I'm leveraging the fact that both EVENTID and PROPERTYID are ints under the hood to share
+  // AdviseEventAddedImpl
+  struct AdvisedEvent {
+    union {
+      EVENTID Event;
+      PROPERTYID Property;
+    };
+    uint32_t Count;
+  };
 
  private:
+  HRESULT AdvisePropertiesAdded(SAFEARRAY *psaProperties) noexcept;
+  HRESULT AdvisePropertiesRemoved(SAFEARRAY *psaProperties) noexcept;
+
+  // Linear search on unsorted vectors is typically faster than more sophisticated data structures when N is small. In
+  // practice ATs tend to only listen to a dozen or so props and events, so std::vector is likely better than maps.
+  std::vector<AdvisedEvent> m_advisedEvents{};
+  std::vector<AdvisedEvent> m_advisedProperties{};
   ::Microsoft::ReactNative::ReactTaggedView m_view;
   HWND m_hwnd{nullptr};
 };