Reland r256396 Add views implementation for AXTreeSource.

ui/views/accessibility/ax_tree_source_views.h

+// Copyright (c) 2014 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_AX_TREE_SOURCE_VIEWS_H_
+#define UI_VIEWS_ACCESSIBILITY_AX_TREE_SOURCE_VIEWS_H_
+
+#include <map>
+
+#include "base/memory/scoped_ptr.h"
+#include "ui/accessibility/ax_tree_source.h"
+#include "ui/views/view.h"
+#include "ui/views/widget/widget_observer.h"
+
+namespace views {
+class AXViewStore;
+
+// This class exposes the views hierarchy as an accessibility tree permitting
+// use with other accessibility classes.
+class VIEWS_EXPORT AXTreeSourceViews : public ui::AXTreeSource<View*>,
+                                       public WidgetObserver {
+ public:
+  explicit AXTreeSourceViews(Widget* root);
+  virtual ~AXTreeSourceViews();
+
+  // AXTreeSource implementation.
+  virtual View* GetRoot() const OVERRIDE;
+  virtual View* GetFromId(int32 id) const OVERRIDE;
+  virtual int32 GetId(View* node) const OVERRIDE;
+  virtual void GetChildren(View* node,
+                           std::vector<View*>* out_children) const OVERRIDE;
+  virtual View* GetParent(View* node) const OVERRIDE;
+  virtual bool IsValid(View* node) const OVERRIDE;
+  virtual bool IsEqual(View* node1,
+                       View* node2) const OVERRIDE;
+  virtual View* GetNull() const OVERRIDE;
+  virtual void SerializeNode(
+      View* node, ui::AXNodeData* out_data) const OVERRIDE;
+
+  // WidgetObserver overrides.
+  virtual void OnViewRemoved(Widget* widget, View* view) OVERRIDE;
+  virtual void OnWidgetDestroyed(Widget* widget) OVERRIDE;
+
+ private:
+  scoped_ptr<AXViewStore> view_store_;
+
+  views::Widget* root_;
+};
+
+} // namespace views
+
+#endif  // UI_VIEWS_ACCESSIBILITY_AX_TREE_SOURCE_VIEWS_H_