a11y: Exclude children of nested keyboard accessible controls from a11y tree.

ui/views/accessibility/native_view_accessibility_base.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_BASE_H_
 #define UI_VIEWS_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_BASE_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "ui/accessibility/ax_action_data.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/accessibility/platform/ax_platform_node.h"
 #include "ui/accessibility/platform/ax_platform_node_delegate.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/accessibility/native_view_accessibility.h"
 #include "ui/views/views_export.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace views {
 
+namespace test {
+class NativeViewAccessibilityBaseIgnoredElementsTest;
+}
+
 class View;
 class Widget;
 
 // Shared base class for platforms that require an implementation of
 // NativeViewAccessibility to interface with the native accessibility toolkit.
 class VIEWS_EXPORT NativeViewAccessibilityBase
     : public NativeViewAccessibility,
       public ui::AXPlatformNodeDelegate,
       public WidgetObserver {
  public:
+  // Convenience method for checking if a View should be ignored by a11y.
+  static bool IsIgnoredView(View* view);
+
   ~NativeViewAccessibilityBase() override;
 
   // NativeViewAccessibility:
   gfx::NativeViewAccessible GetNativeObject() override;
   void NotifyAccessibilityEvent(ui::AXEvent event_type) override;
 
   // ui::AXPlatformNodeDelegate
   const ui::AXNodeData& GetData() const override;
   int GetChildCount() override;
   gfx::NativeViewAccessible ChildAtIndex(int index) override;
   gfx::NativeWindow GetTopLevelWidget() override;
   gfx::NativeViewAccessible GetParent() override;
   gfx::Rect GetScreenBoundsRect() const override;
   gfx::NativeViewAccessible HitTestSync(int x, int y) override;
   gfx::NativeViewAccessible GetFocus() override;
   gfx::AcceleratedWidget GetTargetForNativeAccessibilityEvent() override;
   bool AccessibilityPerformAction(const ui::AXActionData& data) override;
 
   // WidgetObserver
   void OnWidgetDestroying(Widget* widget) override;
 
   Widget* parent_widget() const { return parent_widget_; }
   void SetParentWidget(Widget* parent_widget);
 
  protected:
+  friend class test::NativeViewAccessibilityBaseIgnoredElementsTest;
+
+  // Retrieves the NativeViewAccessibility instance for the given View. This
+  // invokes View::GetNativeViewAccessible() to ensure it exists.
+  static NativeViewAccessibilityBase* GetForView(View* view);
+
   explicit NativeViewAccessibilityBase(View* view);
 
+  // Retrieves the gfx::NativeViewAccessibility for |view_|'s Widget/Rootview.
+  virtual gfx::NativeViewAccessible GetNativeViewAccessibleForWidget();
+
   // Weak. Owns this.
   View* view_;
 
   // Weak. Uses WidgetObserver to clear. This is set on the root view for
   // a widget that's owned by another widget, so we can walk back up the
   // tree.
   Widget* parent_widget_;
 
  protected:
   virtual gfx::RectF GetBoundsInScreen() const;
 
  private:
   void PopulateChildWidgetVector(std::vector<Widget*>* result_child_widgets);
 
   // We own this, but it is reference-counted on some platforms so we can't use
   // a scoped_ptr. It is dereferenced in the destructor.
   ui::AXPlatformNode* ax_node_;
 
+  // Accessibility information associated to |view_|.
   mutable ui::AXNodeData data_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewAccessibilityBase);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_BASE_H_