Keep a cache of all views that have sent notifications. This ensures that AccessibleObjectFromEvent works properly.

BUG=9601
TEST=none
Review URL: http://codereview.chromium.org/2823009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@50302 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 29 insertions, 1 deletions

diff --git a/views/widget/widget_win.h b/views/widget/widget_win.h
index 699d60e3..98da389 100644
--- a/views/widget/widget_win.h
+++ b/views/widget/widget_win.h
@@ -1,4 +1,4 @@
-// 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.
 
@@ -10,6 +10,8 @@
 #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"
@@ -92,6 +94,21 @@ class WidgetWin : public app::WindowImpl,
     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)
@@ -549,6 +566,17 @@ class WidgetWin : public app::WindowImpl,
   // 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