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/chromeos/accessibility_util.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"
+#include "views/widget/widget.h"
+#include "views/controls/menu/menu_runner.h"
+#include "views/controls/menu/menu_item_view.h"
+
+namespace {
+
+enum MenuItemID {
+  MENU_ITEM_DISABLE_SPOKEN_FEEDBACK,
+};
+
+}
+
+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));
+  Update();
+}
+
+AccessibilityMenuButton::~AccessibilityMenuButton() {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// views::ViewMenuDelegate implementation:
+
+void AccessibilityMenuButton::RunMenu(views::View* source,
+                                      const gfx::Point& pt) {
+  PrepareMenu();
+
+  gfx::Point screen_location;
+  views::View::ConvertPointToScreen(source, &screen_location);
+  gfx::Rect bounds(screen_location, source->size());
+  CHECK(menu_runner_->RunMenuAt(source->GetWidget()->GetTopLevelWidget(),
+                                this, bounds, views::MenuItemView::TOPRIGHT,
+                                0) ==
+        views::MenuRunner::NORMAL_EXIT);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// views::MenuDelegate implementation
+
+void AccessibilityMenuButton::ExecuteCommand(int id) {
+  switch (id) {
+    case MENU_ITEM_DISABLE_SPOKEN_FEEDBACK:
+      accessibility::EnableAccessibility(false, NULL);
+      break;
+    default:
+      NOTREACHED();
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// NotificationObserver implementation
+
+void AccessibilityMenuButton::Observe(int type,
+                                      const NotificationSource& source,
+                                      const NotificationDetails& details) {
+  if (type == chrome::NOTIFICATION_PREF_CHANGED)
+    Update();
+}
+
+
+void AccessibilityMenuButton::Update() {
+  // Update tooltip and accessibile name.
+  string16 message =
+      l10n_util::GetStringUTF16(IDS_STATUSBAR_ACCESSIBILITY_ENABLED);
+  SetTooltipText(UTF16ToWide(message));
+  SetAccessibleName(message);
+  // Update visibility.
+  SetVisible(accessibility_enabled_.GetValue());
+}
+
+void AccessibilityMenuButton::PrepareMenu() {
+  views::MenuItemView* menu = new views::MenuItemView(this);
+  if (accessibility_enabled_.GetValue())
+    menu->AppendMenuItemWithLabel(MENU_ITEM_DISABLE_SPOKEN_FEEDBACK,
+                                  UTF16ToWide(l10n_util::GetStringUTF16(
+                                      IDS_STATUSBAR_DISABLE_SPOKEN_FEEDBACK)));
+  // |menu_runner_| takes the ownership of |menu|
+  menu_runner_.reset(new views::MenuRunner(menu));
+}
+
+}  // namespace chromeos