Make BrowserAccessibilityManager cross platform. Step 1....

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>
-#include <oleacc.h>
-
-#include <hash_map>
-#include <vector>
-
-#include "base/hash_tables.h"
-#include "base/scoped_comptr_win.h"
-#include "base/scoped_ptr.h"
-#include "webkit/glue/webaccessibility.h"
-
-class BrowserAccessibility;
-struct ViewHostMsg_AccessibilityNotification_Params;
-
-class BrowserAccessibilityFactory {
- public:
-  virtual ~BrowserAccessibilityFactory() {}
-
-  // Create an instance of BrowserAccessibility and return a new
-  // reference to it.
-  virtual BrowserAccessibility* Create();
-};
-
-// Class that can perform actions on behalf of the BrowserAccessibilityManager.
-class BrowserAccessibilityDelegate {
- public:
-  virtual ~BrowserAccessibilityDelegate() {}
-  virtual void SetAccessibilityFocus(int acc_obj_id) = 0;
-  virtual void AccessibilityDoDefaultAction(int acc_obj_id) = 0;
-};
-
-// Manages a tree of BrowserAccessibility objects.
-class BrowserAccessibilityManager {
- public:
-  BrowserAccessibilityManager(
-      HWND parent_hwnd,
-      const webkit_glue::WebAccessibility& src,
-      BrowserAccessibilityDelegate* delegate,
-      BrowserAccessibilityFactory* factory = new BrowserAccessibilityFactory());
-
-  virtual ~BrowserAccessibilityManager();
-
-  // Return a pointer to the root of the tree, does not make a new reference.
-  BrowserAccessibility* GetRoot();
-
-  // Removes the BrowserAccessibility child_id from the manager.
-  void Remove(LONG child_id);
-
-  // Return a pointer to the object corresponding to the given child_id,
-  // does not make a new reference.
-  BrowserAccessibility* GetFromChildID(LONG child_id);
-
-  // Get a the default IAccessible for the parent window, does not make a
-  // new reference.
-  IAccessible* GetParentWindowIAccessible();
-
-  // Get the parent window.
-  HWND GetParentHWND();
-
-  // Return the object that has focus, if it's a descandant of the
-  // given root (inclusive). Does not make a new reference.
-  BrowserAccessibility* GetFocus(BrowserAccessibility* root);
-
-  // Tell the renderer to set focus to this node.
-  void SetFocus(const BrowserAccessibility& node);
-
-  // 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:
-  // 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.
-  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);
-
-  // 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,
-      int index_in_parent);
-
-  // The parent window.
-  HWND parent_hwnd_;
-
-  // The object that can perform actions on our behalf.
-  BrowserAccessibilityDelegate* delegate_;
-
-  // Factory to create BrowserAccessibility objects (for dependency injection).
-  scoped_ptr<BrowserAccessibilityFactory> factory_;
-
-  // A default IAccessible instance for the parent window.
-  ScopedComPtr<IAccessible> window_iaccessible_;
-
-  // The root of the tree of IAccessible objects and the element that
-  // currently has focus, if any.
-  BrowserAccessibility* root_;
-  BrowserAccessibility* focus_;
-
-  // A mapping from the IDs of objects in the renderer, to the child IDs
-  // we use internally here.
-  base::hash_map<int, LONG> renderer_id_to_child_id_map_;
-
-  // A mapping from child IDs to BrowserAccessibility objects.
-  base::hash_map<LONG, BrowserAccessibility*> child_id_map_;
-
-  // 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_