Refactoring select popup on Mac....

chrome/browser/tab_contents/popup_menu_helper_mac.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_TAB_CONTENTS_POPUP_MENU_HELPER_MAC_H_
+#define CHROME_BROWSER_TAB_CONTENTS_POPUP_MENU_HELPER_MAC_H_
+
+#include <vector>
+
+#include "chrome/common/notification_observer.h"
+#include "chrome/common/notification_registrar.h"
+#include "gfx/rect.h"
+
+class RenderViewHost;
+struct WebMenuItem;
+
+class PopupMenuHelper : public NotificationObserver {
+ public:
+  // Creates a PopupMenuHelper that will notify |render_view_host| when a user
+  // selects or cancels the popup.
+  explicit PopupMenuHelper(RenderViewHost* render_view_host);
+
+  // Shows the popup menu and notifies the RenderViewHost of the selection/
+  // cancel.
+  // This call is blocking.
+  void ShowPopupMenu(const gfx::Rect& bounds,
+                     int item_height,
+                     double item_font_size,
+                     int selected_item,
+                     const std::vector<WebMenuItem>& items,
+                     bool right_aligned);
+
+ private:
+  // NotificationObserver implementation:
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+  NotificationRegistrar notification_registrar_;
+
+  RenderViewHost* render_view_host_;
+
+  DISALLOW_COPY_AND_ASSIGN(PopupMenuHelper);
+};
+
+#endif  // CHROME_BROWSER_TAB_CONTENTS_POPUP_MENU_HELPER_MAC_H_