Add a button on status bar to indicate that accessibility is enabled.

chrome/browser/chromeos/status/accessibility_menu_button.cc

+// Copyright (c) 2011 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.
+
+#include "chrome/browser/chromeos/status/accessibility_menu_button.h"
+
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/prefs/pref_service.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/pref_names.h"
+#include "grit/generated_resources.h"
+#include "grit/theme_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/resource/resource_bundle.h"
+
+namespace chromeos {
+
+////////////////////////////////////////////////////////////////////////////////
+// AccessibilityMenuButton
+
+AccessibilityMenuButton::AccessibilityMenuButton(StatusAreaHost* host)
+    : StatusAreaButton(host, this) {
+  accessibility_enabled_.Init(prefs::kAccessibilityEnabled,
+                              g_browser_process->local_state(), this);
+  SetIcon(*ResourceBundle::GetSharedInstance().GetBitmapNamed(
+      IDR_STATUSBAR_ACCESSIBILITY));
+  UpdateTooltip();
+}
+
+AccessibilityMenuButton::~AccessibilityMenuButton() {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// views::ViewMenuDelegate implementation:
+
+void AccessibilityMenuButton::RunMenu(views::View* unused_source,
+                                 const gfx::Point& pt) {
+  // This button is just an indicator, and therefore does not have a menu.
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NotificationObserver implementation
+
+void AccessibilityMenuButton::Observe(int type,
+                                 const NotificationSource& source,

[Zachary Kuznia, 2011/08/29 04:09:48]

nit:  Indent should line up with int on previous line.

[hashimoto, 2011/08/29 08:22:48]

Fixed.

+                                 const NotificationDetails& details) {
+  if (type == chrome::NOTIFICATION_PREF_CHANGED)
+    UpdateTooltip();
+}
+
+void AccessibilityMenuButton::UpdateTooltip() {
+  string16 message =
+      l10n_util::GetStringUTF16(IDS_STATUSBAR_ACCESSIBILITY_ENABLED);
+  SetTooltipText(UTF16ToWide(message));
+  SetAccessibleName(message);
+  SetVisible(accessibility_enabled_.GetValue());
+}
+
+}  // namespace chromeos