backup for dynamic recent tabs submenu

chrome/browser/ui/views/recent_tabs_menu_model_delegate.h

+// Copyright (c) 2012 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_UI_VIEWS_RECENT_TABS_MENU_MODEL_DELEGATE_H_
+#define CHROME_BROWSER_UI_VIEWS_RECENT_TABS_MENU_MODEL_DELEGATE_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/base/models/menu_model_delegate.h"
+
+class MenuItemsChangedDelegate;
+class RecentTabsSubMenuModel;
+
+namespace gfx {
+class Font;
+};
+
+namespace views {
+class MenuItemView;
+};
+
+// Provides the ui::MenuModelDelegate implementation for RecentTabsSubMenuModel
+// items.
+class RecentTabsMenuModelDelegate : public ui::MenuModelDelegate {
+ public:
+  RecentTabsMenuModelDelegate(MenuItemsChangedDelegate* items_changed_delegate,
+                              RecentTabsSubMenuModel* model,
+                              views::MenuItemView* menu_item,
+                              int first_command_id,
+                              int max_command_id);
+  virtual ~RecentTabsMenuModelDelegate();
+
+  void PopulateMenu();
+
+  // Return the specific menu width of recent tabs submenu if |menu| is the
+  // recent tabs submenu, else return -1.
+  int GetMaxWidthForMenu(views::MenuItemView* menu);
+
+  const gfx::Font* GetLabelFontAt(int item_id) const;
+
+  bool GetForegroundColor(int command_id, bool is_hovered,
+                          SkColor* override_color) const;
+
+  // ui::MenuModelDelegate implementation:
+  virtual void OnIconChanged(int index) OVERRIDE;
+  virtual void PrepareForChange() OVERRIDE;
+  virtual void OnItemRemoved(int index) OVERRIDE;
+  virtual void OnItemAdded(int index) OVERRIDE;
+  virtual void ChangesDone() OVERRIDE;
+
+ private:
+  int ModelIndexToMenuItemId(int model_index) const;
+  int MenuItemIdToModelIndex(int menu_item_id) const;
+
+  MenuItemsChangedDelegate* items_changed_delegate_;
+  RecentTabsSubMenuModel* model_;
+  views::MenuItemView* menu_item_;
+  int first_command_id_;
+  int max_command_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(RecentTabsMenuModelDelegate);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_RECENT_TABS_MENU_MODEL_DELEGATE_H_