WebBrowserComponent: Windows: Add accessibility integration

modules/juce_gui_basics/accessibility/juce_AccessibilityHandler.cpp

@@ -28,6 +28,63 @@ namespace juce
 
 AccessibilityHandler* AccessibilityHandler::currentlyFocusedHandler = nullptr;
 
+class NativeChildHandler
+{
+public:
+    static NativeChildHandler& getInstance()
+    {
+        static NativeChildHandler instance;
+        return instance;
+    }
+
+    void* getNativeChild (Component& component) const
+    {
+        if (auto it = nativeChildForComponent.find (&component);
+            it != nativeChildForComponent.end())
+        {
+            return it->second;
+        }
+
+        return nullptr;
+    }
+
+    Component* getComponent (void* nativeChild) const
+    {
+        if (auto it = componentForNativeChild.find (nativeChild);
+            it != componentForNativeChild.end())
+        {
+            return it->second;
+        }
+
+        return nullptr;
+    }
+
+    void setNativeChild (Component& component, void* nativeChild)
+    {
+        clearComponent (component);
+
+        if (nativeChild != nullptr)
+        {
+            nativeChildForComponent[&component]  = nativeChild;
+            componentForNativeChild[nativeChild] = &component;
+        }
+    }
+
+private:
+    NativeChildHandler() = default;
+
+    void clearComponent (Component& component)
+    {
+        if (auto* nativeChild = getNativeChild (component))
+            componentForNativeChild.erase (nativeChild);
+
+        nativeChildForComponent.erase (&component);
+    }
+
+    std::map<void*, Component*> componentForNativeChild;
+    std::map<Component*, void*> nativeChildForComponent;
+};
+
 AccessibilityHandler::AccessibilityHandler (Component& comp,
                                             AccessibilityRole accessibilityRole,
                                             AccessibilityActions accessibilityActions,
@@ -322,6 +379,21 @@ std::unique_ptr<AccessibilityHandler::AccessibilityNativeImpl> AccessibilityHand
    #endif
 }
 
+void* AccessibilityHandler::getNativeChildForComponent (Component& component)
+{
+    return NativeChildHandler::getInstance().getNativeChild (component);
+}
+
+Component* AccessibilityHandler::getComponentForNativeChild (void* nativeChild)
+{
+    return NativeChildHandler::getInstance().getComponent (nativeChild);
+}
+
+void AccessibilityHandler::setNativeChildForComponent (Component& component, void* nativeChild)
+{
+    NativeChildHandler::getInstance().setNativeChild (component, nativeChild);
+}
+
 #if ! JUCE_NATIVE_ACCESSIBILITY_INCLUDED
  void AccessibilityHandler::notifyAccessibilityEvent (AccessibilityEvent) const {}
  void AccessibilityHandler::postAnnouncement (const String&, AnnouncementPriority) {}

modules/juce_gui_basics/accessibility/juce_AccessibilityHandler.h

@@ -291,6 +291,26 @@ public:
     AccessibilityNativeHandle* getNativeImplementation() const;
     /** @internal */
     std::type_index getTypeIndex() const  { return typeIndex; }
+    /** @internal */
+    static void clearCurrentlyFocusedHandler() { currentlyFocusedHandler = nullptr; }
+
+    /** @internal
+
+        The following functions provide the means to associate JUCE Components with OS specific
+        types that provide their own accessibility mechanisms. This way accessibility navigation
+        can move from a JUCE Component to a native, embedded window and back.
+
+        These functions assume that the concrete types behind the void* are
+        - Windows: HWND
+        - MacOS: NSView*
+        - iOS: UIView*
+        - Android: GlobalRef that points to an android.view.View
+    */
+    static void*      getNativeChildForComponent (Component& component);
+    /** @internal */
+    static void       setNativeChildForComponent (Component& component, void* nativeChild);
+    /** @internal */
+    static Component* getComponentForNativeChild (void* nativeChild);
 
 private:
     //==============================================================================