Make the selection start and end attributes of an html input control...

chrome/browser/browser_accessibility_manager_win.h

 // Copyright (c) 2010 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_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_
 #define CHROME_BROWSER_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_
 #pragma once
 
 #include <atlbase.h>
 #include <atlcom.h>
@@ skipping 64 matching lines @@
 
   // Tell the renderer to do the default action for this node.
   void DoDefaultAction(const BrowserAccessibility& node);
 
   // Called when the renderer process has notified us of about tree changes.
   // Send a notification to MSAA clients of the change.
   void OnAccessibilityNotifications(
     const std::vector<ViewHostMsg_AccessibilityNotification_Params>& params);
 
  private:
+  // Recursively compare the IDs of our subtree to a new subtree received
+  // from the renderer and return true if their IDs match exactly.
+  bool CanModifyTreeInPlace(
+      BrowserAccessibility* current_root,
+      const webkit_glue::WebAccessibility& new_root);
+
+  // Recursively modify a subtree (by reinitializing) to match a new
+  // subtree received from the renderer process. Should only be called
+  // if CanModifyTreeInPlace returned true.
+  void ModifyTreeInPlace(
+      BrowserAccessibility* current_root,
+      const webkit_glue::WebAccessibility& new_root);
+
   // Update the accessibility tree with an updated WebAccessibility tree or
-  // subtree received from the renderer process. Returns the updated node or
-  // NULL if no node was updated.
+  // subtree received from the renderer process. First attempts to modify
+  // the tree in place, and if that fails, replaces the entire subtree.
+  // Returns the updated node or NULL if no node was updated.
   BrowserAccessibility* UpdateTree(
       const webkit_glue::WebAccessibility& acc_obj);
 
   void OnAccessibilityObjectStateChange(
       const webkit_glue::WebAccessibility& acc_obj);
   void OnAccessibilityObjectChildrenChange(
       const webkit_glue::WebAccessibility& acc_obj);
   void OnAccessibilityObjectFocusChange(
       const webkit_glue::WebAccessibility& acc_obj);
   void OnAccessibilityObjectLoadComplete(
       const webkit_glue::WebAccessibility& acc_obj);
   void OnAccessibilityObjectValueChange(
       const webkit_glue::WebAccessibility& acc_obj);
+  void OnAccessibilityObjectTextChange(
+      const webkit_glue::WebAccessibility& acc_obj);
 
   // Returns the next MSAA child id.
   static LONG GetNextChildID();
 
   // Recursively build a tree of BrowserAccessibility objects from
   // the WebAccessibility tree received from the renderer process.
   BrowserAccessibility* CreateAccessibilityTree(
       BrowserAccessibility* parent,
       int child_id,
       const webkit_glue::WebAccessibility& src,
@@ skipping 25 matching lines @@
 
   // The next child ID to use; static so that they're global to the process.
   // Screen readers cache these IDs to see if they've seen the same object
   // before so we should avoid reusing them within the same project.
   static LONG next_child_id_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManager);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_