xref: /external/chromium_org/ui/views/accessibility/native_view_accessibility.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_H_
#define UI_VIEWS_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_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/views_export.h"

namespace views {

class View;

class VIEWS_EXPORT NativeViewAccessibility : public ui::AXPlatformNodeDelegate {
 public:
  static NativeViewAccessibility* Create(View* view);

  virtual gfx::NativeViewAccessible GetNativeObject();

  // Call Destroy rather than deleting this, because the subclass may
  // use reference counting.
  virtual void Destroy();

  // WebViews need to be registered because they implement their own
  // tree of accessibility objects, and we need to check them when
  // mapping a child id to a NativeViewAccessible.
  static void RegisterWebView(View* web_view);
  static void UnregisterWebView(View* web_view);

  // ui::AXPlatformNodeDelegate
  virtual ui::AXNodeData* GetData() OVERRIDE;
  virtual int GetChildCount() OVERRIDE;
  virtual gfx::NativeViewAccessible ChildAtIndex(int index) OVERRIDE;
  virtual gfx::NativeViewAccessible GetParent() OVERRIDE;
  virtual gfx::Vector2d GetGlobalCoordinateOffset() OVERRIDE;
  virtual void NotifyAccessibilityEvent(ui::AXEvent event_type) OVERRIDE;

 protected:
  NativeViewAccessibility();
  virtual ~NativeViewAccessibility();

  void set_view(views::View* view) { view_ = view; }
  const View* view() const { return view_; }

  View* view_;  // Weak. Owns this.

 private:
  // 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_;

  ui::AXNodeData data_;

  DISALLOW_COPY_AND_ASSIGN(NativeViewAccessibility);
};

}  // namespace views

#endif  // UI_VIEWS_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_H_