Added basic accessibility to TreeView.

chrome/browser/accessibility/accessibility_events.h

 // Copyright (c) 2012 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 CHROME_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EVENTS_H_
 #define CHROME_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EVENTS_H_
 
 #include <string>
 #include "base/compiler_specific.h"
 #include "ui/base/accessibility/accessibility_types.h"
@@ skipping 207 matching lines @@
 
  private:
   std::string value_;
   // The 0-based index of the current item and the number of total items.
   // If the value is not one of the drop-down options, |item_index_| should
   // be -1.
   int item_index_;
   int item_count_;
 };
 
+
 // Accessibility information about a text box, passed to onControlFocused,
 // onControlAction, and onTextChanged event listeners.
 class AccessibilityTextBoxInfo : public AccessibilityControlInfo {
  public:
   AccessibilityTextBoxInfo(Profile* profile,
                            const std::string& name,
                            const std::string& context,
                            bool password);
 
   virtual const char* type() const OVERRIDE;
@@ skipping 80 matching lines @@
   int item_count() const { return item_count_; }
   bool has_submenu() const { return has_submenu_; }
 
  private:
   bool has_submenu_;
   // The 0-based index of the current item and the number of total items.
   int item_index_;
   int item_count_;
 };
 
+// Accessibility information about a tree; this class is used by
+// onControlFocused event listeners.
+class AccessibilityTreeInfo : public AccessibilityControlInfo {
+ public:
+  AccessibilityTreeInfo(Profile* profile, const std::string& menu_name);
+
+  virtual const char* type() const OVERRIDE;
+};
+
+// Accessibility information about a tree item; this class is used by
+// onControlFocused event listeners.
+class AccessibilityTreeItemInfo : public AccessibilityControlInfo {
+ public:
+  AccessibilityTreeItemInfo(Profile* profile,
+                            const std::string& name,
+                            const std::string& context,
+                            int item_depth,
+                            int item_index,
+                            int item_count,
+                            int children_count,
+                            bool is_expanded);
+
+  virtual const char* type() const OVERRIDE;
+
+  virtual void SerializeToDict(base::DictionaryValue* dict) const OVERRIDE;
+
+  int item_depth() const { return item_depth_; }
+  int item_index() const { return item_index_; }
+  int item_count() const { return item_count_; }
+  int children_count() const { return children_count_; }
+  bool is_expanded() const { return is_expanded_; }
+
+ private:
+  // 0-based item depth.
+  int item_depth_;
+  // The 0-based index of the current item and the number of total items at the
+  // current depth.
+  int item_index_;
+  // Count of items at the current depth.
+  int item_count_;
+  // Count of children of the current item.
+  int children_count_;
+  // True if the node is expanded.
+  bool is_expanded_;
+};
+
 // Accessibility information about a slider passed to onControlFocused
 // and onControlAction event listeners.
 class AccessibilitySliderInfo : public AccessibilityControlInfo {
  public:
   AccessibilitySliderInfo(Profile* profile,
                           const std::string& name,
                           const std::string& context,
                           const std::string& value);
 
   virtual const char* type() const OVERRIDE;
 
   virtual void SerializeToDict(base::DictionaryValue* dict) const OVERRIDE;
 
   const std::string& value() const { return value_; }
 
  private:
   std::string value_;
 };
 
 // Accessibility information about an alert passed to onControlAction event.
 class AccessibilityAlertInfo : public AccessibilityControlInfo {
  public:
   AccessibilityAlertInfo(Profile* profile, const std::string& name);
 
   virtual const char* type() const OVERRIDE;
 };
 
 #endif  // CHROME_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EVENTS_H_