Implement "Language Switcher" for Chromium OS.

chrome/browser/chromeos/language_menu_button.h

+// Copyright (c) 2006-2008 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_CHROMEOS_LANGUAGE_MENU_BUTTON_H_
+#define CHROME_BROWSER_CHROMEOS_LANGUAGE_MENU_BUTTON_H_
+
+#include "chrome/browser/chromeos/language_library.h"
+#include "chrome/browser/chromeos/status_area_button.h"
+#include "views/controls/menu/menu_2.h"
+#include "views/controls/menu/view_menu_delegate.h"
+
+class Browser;
+class SkBitmap;
+
+namespace chromeos {
+
+// The language menu button in the status area.
+// This class will handle getting the IME/XKB status and populating the menu.
+class LanguageMenuButton : public views::MenuButton,
+                           public views::ViewMenuDelegate,
+                           public menus::MenuModel,
+                           public LanguageLibrary::Observer {
+ public:
+  explicit LanguageMenuButton(Browser* browser);
+  virtual ~LanguageMenuButton();
+
+  // views::Menu2Model implementation.
+  virtual bool HasIcons() const;
+  virtual int GetItemCount() const;
+  virtual menus::MenuModel::ItemType GetTypeAt(int index) const;
+  virtual int GetCommandIdAt(int index) const;
+  virtual string16 GetLabelAt(int index) const;
+  virtual bool IsLabelDynamicAt(int index) const;
+  virtual bool GetAcceleratorAt(int index,
+                                menus::Accelerator* accelerator) const;
+  virtual bool IsItemCheckedAt(int index) const;
+  virtual int GetGroupIdAt(int index) const;
+  virtual bool GetIconAt(int index, SkBitmap* icon) const;
+  virtual bool IsEnabledAt(int index) const;
+  virtual menus::MenuModel* GetSubmenuModelAt(int index) const;
+  virtual void HighlightChangedTo(int index);
+  virtual void ActivatedAt(int index);
+  virtual void MenuWillShow();
+
+  // LanguageLibrary::Observer implementation.
+  virtual void LanguageChanged(LanguageLibrary* obj);
+
+ private:
+  // views::ViewMenuDelegate implementation.
+  virtual void RunMenu(views::View* source, const gfx::Point& pt);
+
+  // Update the status area with |name|.
+  void UpdateIcon(const std::wstring& name);
+
+  // The current language list.
+  scoped_ptr<InputLanguageList> language_list_;
+
+  // The language menu.
+  views::Menu2 language_menu_;
+  // The browser window that owns us.
+  Browser* browser_;
+
+  DISALLOW_COPY_AND_ASSIGN(LanguageMenuButton);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LANGUAGE_MENU_BUTTON_H_