Show tooltips only for users with identical display names....

chrome/browser/chromeos/login/user_controller.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/user_controller.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "app/l10n_util.h"
@@ skipping 46 matching lines @@
       controller_->SelectUser(controller_->user_index());
 
     return views::WidgetGtk::OnButtonPress(widget, event);
   }
 
   UserController* controller_;
 
   DISALLOW_COPY_AND_ASSIGN(ClickNotifyingWidget);
 };
 
+// Returns tooltip text for user name. Tooltip contains user's display name
+// and his email domain to distinguish this user from the other one with the
+// same display name.
+std::string GetNameTooltip(const UserManager::User& user) {
+  const std::string& email = user.email();
+  size_t at_pos = email.rfind('@');
+  if (at_pos == std::string::npos) {
+    NOTREACHED();
+    return std::string();
+  }
+  size_t domain_start = at_pos + 1;
+  std::string domain = email.substr(domain_start,
+                                    email.length() - domain_start);
+  return StringPrintf("%s (%s)",
+                      user.GetDisplayName().c_str(),
+                      domain.c_str());
+}
+
 // NativeButton that will always return focus to password field.
 class UserEntryNativeButton : public views::NativeButton {
  public:
   UserEntryNativeButton(UserController* controller,
                         views::ButtonListener* listener,
                         const std::wstring& label)
       : NativeButton(listener, label),
         controller_(controller) {}
 
   // Overridden from View:
@@ skipping 141 matching lines @@
     FocusPasswordField();
   }
 }
 
 void UserController::EnableNameTooltip(bool enable) {
   if (is_guest_)
     return;
 
   std::wstring tooltip_text;
   if (enable)
-    tooltip_text = UTF8ToWide(user_.email());
+    tooltip_text = UTF8ToWide(GetNameTooltip(user_));
 
   if (user_view_)
     user_view_->SetTooltipText(tooltip_text);
   if (label_view_)
     label_view_->SetTooltipText(tooltip_text);
   if (unselected_label_view_)
     unselected_label_view_->SetTooltipText(tooltip_text);
 }
 
 void UserController::ButtonPressed(views::Button* sender,
@@ skipping 227 matching lines @@
 
 void UserController::SelectUser(int index) {
   delegate_->SelectUser(index);
 }
 
 void UserController::FocusPasswordField() {
   password_field_->RequestFocus();
 }
 
 }  // namespace chromeos