Add an accessibility API for events raised outside of the web content.

chrome/browser/gtk/accessible_widget_helper_gtk.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_GTK_ACCESSIBLE_WIDGET_HELPER_GTK_H_
+#define CHROME_BROWSER_GTK_ACCESSIBLE_WIDGET_HELPER_GTK_H_
+
+#include <gtk/gtk.h>
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/singleton.h"
+#include "chrome/browser/gtk/accessibility_event_router_gtk.h"
+#include "chrome/common/accessibility_events.h"
+
+class Profile;
+
+// Helper class that helps to manage the accessibility information for all
+// of the widgets in a container.  Create an instance of this class for
+// each container GtkWidget (like a dialog) that should send accessibility
+// events for all of its descendants.
+//
+// Most controls have default behavior for accessibility; when this needs
+// to be augmented, call one of the methods below to ignore a particular
+// widget or change its details.
+//
+// All of the information managed by this class is registered with the
+// (global) AccessibilityEventRouter and unregistered when this object is
+// destroyed.
+class AccessibleWidgetHelper {
+ public:
+  // Contruct an AccessibleWidgetHelper that makes the given root widget
+  // accessible for the lifetime of this object, sending accessibility
+  // notifications to the given profile.
+  AccessibleWidgetHelper(GtkWidget* root_widget, Profile* profile);
+
+  virtual ~AccessibleWidgetHelper();
+
+  // Do not send accessibility events for this widget
+  void IgnoreWidget(GtkWidget* widget);
+
+  // Use the following string as the name of this widget, instead of the
+  // gtk label associated with the widget.
+  void SetWidgetName(GtkWidget* widget, std::string name);
+
+  // Use the following string as the name of this widget, instead of the
+  // gtk label associated with the widget.
+  void SetWidgetName(GtkWidget* widget, int string_id);
+
+ private:
+  AccessibilityEventRouter* accessibility_event_router_;
+  GtkWidget* root_widget_;
+  std::vector<GtkWidget*> managed_widgets_;
+};
+
+#endif  // CHROME_BROWSER_GTK_ACCESSIBLE_WIDGET_HELPER_GTK_H_