Use AccessibilityBridgeWindows for AXFragmentRootDelegateWin

shell/platform/windows/accessibility_bridge_windows.cc

@@ -173,4 +173,16 @@ void AccessibilityBridgeWindows::SetFocus(
   node_delegate->SetFocus();
 }
 
+gfx::NativeViewAccessible AccessibilityBridgeWindows::GetChildOfAXFragmentRoot() {
+  return view_->GetNativeViewAccessible();
+}
+
+gfx::NativeViewAccessible AccessibilityBridgeWindows::GetParentOfAXFragmentRoot() {
+  return nullptr;
+}
+
+bool AccessibilityBridgeWindows::IsAXFragmentRootAControlElement() {
+  return true;
+}
+
 }  // namespace flutter

shell/platform/windows/accessibility_bridge_windows.h

@@ -6,6 +6,7 @@
 #define FLUTTER_SHELL_PLATFORM_WINDOWS_ACCESSIBILITY_BRIDGE_WINDOWS_H_
 
 #include "flutter/shell/platform/common/accessibility_bridge.h"
+#include "flutter/third_party/accessibility/ax/platform/ax_fragment_root_delegate_win.h"
 
 namespace flutter {
 
@@ -22,7 +23,8 @@ class FlutterPlatformNodeDelegateWindows;
 ///
 /// AccessibilityBridgeWindows must be created as a shared_ptr, since some
 /// methods acquires its weak_ptr.
-class AccessibilityBridgeWindows : public AccessibilityBridge {
+class AccessibilityBridgeWindows : public AccessibilityBridge,
+                                   public ui::AXFragmentRootDelegateWin {
  public:
   AccessibilityBridgeWindows(FlutterWindowsEngine* engine,
                              FlutterWindowsView* view);
@@ -48,6 +50,15 @@ class AccessibilityBridgeWindows : public AccessibilityBridge {
   virtual void SetFocus(
       std::shared_ptr<FlutterPlatformNodeDelegateWindows> node_delegate);
 
+  // |AXFragmentRootDelegateWin|
+  gfx::NativeViewAccessible GetChildOfAXFragmentRoot() override;
+
+  // |AXFragmentRootDelegateWin|
+  gfx::NativeViewAccessible GetParentOfAXFragmentRoot() override;
+
+  // |AXFragmentRootDelegateWin|
+  bool IsAXFragmentRootAControlElement() override;
+
  protected:
   // |AccessibilityBridge|
   void OnAccessibilityEvent(

shell/platform/windows/flutter_windows_view.cc

@@ -678,8 +678,7 @@ void FlutterWindowsView::NotifyWinEventWrapper(DWORD event,
 }
 
 ui::AXFragmentRootDelegateWin* FlutterWindowsView::GetAxFragmentRootDelegate() {
-  // TODO(schectman): implement
-  return nullptr;
+  return engine_->accessibility_bridge().lock().get();
 }
 
 }  // namespace flutter

shell/platform/windows/window.cc

@@ -204,14 +204,10 @@ LRESULT Window::OnGetObject(UINT const message,
   // TODO(schectman): UIA is currently disabled by default.
   // https://github.com/flutter/flutter/issues/114547
   if (is_uia_request && root_view) {
-#ifndef FLUTTER_ENGINE_USE_UIA
+#ifdef FLUTTER_ENGINE_USE_UIA
     if (!ax_fragment_root_) {
-      if (!ax_fragment_delegate_) {
-        ax_fragment_delegate_ =
-            std::make_unique<WindowAXFragmentRootDelegate>(*this);
-      }
       ax_fragment_root_ = std::make_unique<ui::AXFragmentRootWin>(
-          window_handle_, ax_fragment_delegate_.get());
+          window_handle_, GetAxFragmentRootDelegate());
     }
 
     // Retrieve UIA object for the root view.
@@ -680,21 +676,4 @@ void Window::CreateAccessibilityRootNode() {
   accessibility_root_ = AccessibilityRootNode::Create();
 }
 
-gfx::NativeViewAccessible
-WindowAXFragmentRootDelegate::GetChildOfAXFragmentRoot() {
-  return window_.GetNativeViewAccessible();
-}
-
-gfx::NativeViewAccessible
-WindowAXFragmentRootDelegate::GetParentOfAXFragmentRoot() {
-  return nullptr;
-}
-
-bool WindowAXFragmentRootDelegate::IsAXFragmentRootAControlElement() {
-  return true;
-}
-
-WindowAXFragmentRootDelegate::WindowAXFragmentRootDelegate(Window& window)
-    : window_(window) {}
-
 }  // namespace flutter

shell/platform/windows/window.h

@@ -26,8 +26,6 @@
 
 namespace flutter {
 
-class WindowAXFragmentRootDelegate;
-
 // A class abstraction for a high DPI aware Win32 Window.  Intended to be
 // inherited from by classes that wish to specialize with custom
 // rendering and input handling.
@@ -310,31 +308,10 @@ class Window : public KeyboardManager::WindowDelegate {
   // Implements IRawElementProviderFragmentRoot when UIA is enabled.
   std::unique_ptr<ui::AXFragmentRootWin> ax_fragment_root_;
 
-  // Delegate for Fragment.
-  std::unique_ptr<WindowAXFragmentRootDelegate> ax_fragment_delegate_;
-
   // Allow WindowAXFragmentRootDelegate to access protected method.
   friend class WindowAXFragmentRootDelegate;
 };
 
-// A delegate class to the window.
-class WindowAXFragmentRootDelegate : public ui::AXFragmentRootDelegateWin {
- public:
-  // | AXFragmentRootDelegateWin |
-  gfx::NativeViewAccessible GetChildOfAXFragmentRoot() override;
-
-  // | AXFragmentRootDelegateWin |
-  gfx::NativeViewAccessible GetParentOfAXFragmentRoot() override;
-
-  // | AXFragmentRootDelegateWin |
-  bool IsAXFragmentRootAControlElement() override;
-
-  WindowAXFragmentRootDelegate(Window& window);
-
- private:
-  Window& window_;
-};
-
 }  // namespace flutter
 
 #endif  // FLUTTER_SHELL_PLATFORM_WINDOWS_FLUTTER_WIN32_WINDOW_H_