Keep a map of all views that have sent notifications. This ensures that Acce...

views/widget/widget_win.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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 VIEWS_WIDGET_WIDGET_WIN_H_
 #define VIEWS_WIDGET_WIDGET_WIN_H_
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <atlcrack.h>
 #include <atlmisc.h>
 
+#include <vector>
+
 #include "app/win/window_impl.h"
 #include "base/message_loop.h"
 #include "base/scoped_comptr_win.h"
 #include "views/focus/focus_manager.h"
 #include "views/layout_manager.h"
 #include "views/widget/widget.h"
 
 namespace gfx {
 class Canvas;
 class Rect;
@@ skipping 62 matching lines @@
   }
 
   // See description of use_layered_buffer_ for details.
   void SetUseLayeredBuffer(bool use_layered_buffer);
 
   // Disable Layered Window updates by setting to false.
   void set_can_update_layered_window(bool can_update_layered_window) {
     can_update_layered_window_ = can_update_layered_window;
   }
 
+  // Obtain the view event with the given MSAA child id.  Used in
+  // ViewAccessibility::get_accChild to support requests for children of
+  // windowless controls.  May return NULL (see ViewHierarchyChanged).
+  View* GetAccessibilityViewEventAt(int id);
+
+  // Add a view that has recently fired an accessibility event.  Returns a MSAA
+  // child id which is generated by: -(index of view in vector + 1) which
+  // guarantees a negative child id.  This distinguishes the view from
+  // positive MSAA child id's which are direct leaf children of views that have
+  // associated hWnd's (e.g. WidgetWin).
+  int AddAccessibilityViewEvent(View* view);
+
+  // Clear a view that has recently been removed on a hierarchy change.
+  void ClearAccessibilityViewEvent(View* view);
+
   BEGIN_MSG_MAP_EX(WidgetWin)
     // Range handlers must go first!
     MESSAGE_RANGE_HANDLER_EX(WM_MOUSEFIRST, WM_MOUSELAST, OnMouseRange)
     MESSAGE_RANGE_HANDLER_EX(WM_NCMOUSEMOVE, WM_NCMOUSEMOVE, OnMouseRange)
 
     // Reflected message handler
     MESSAGE_HANDLER_EX(kReflectedMessage, OnReflectedMessage)
 
     // CustomFrameWindow hacks
     MESSAGE_HANDLER_EX(WM_NCUAHDRAWCAPTION, OnNCUAHDrawCaption)
@@ skipping 437 matching lines @@
   bool restore_focus_when_enabled_;
 
   // Instance of accessibility information and handling for MSAA root
   ScopedComPtr<IAccessible> accessibility_root_;
 
   scoped_ptr<DefaultThemeProvider> default_theme_provider_;
 
   // Non owned pointer to optional delegate.  May be NULL if no delegate is
   // being used.
   WidgetDelegate* delegate_;
+
+  // The maximum number of view events in our vector below.
+  static const int kMaxAccessibilityViewEvents = 20;
+
+  // A vector used to access views for which we have sent notifications to
+  // accessibility clients.  It is used as a circular queue.
+  std::vector<View*> accessibility_view_events_;
+
+  // The current position of the view events vector.  When incrementing,
+  // we always mod this value with the max view events above .
+  int accessibility_view_events_index_;
 };
 
 }  // namespace views
 
 #endif  // VIEWS_WIDGET_WIDGET_WIN_H_