Implementaion for showing recently closed tabs list on right clicking new tab button.

chrome/browser/ui/tabs/recently_closed_tabs_menu_model.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_TABS_RECENTLY_CLOSED_TABS_MENU_MODEL_H_
+#define CHROME_BROWSER_UI_TABS_RECENTLY_CLOSED_TABS_MENU_MODEL_H_
+#pragma once
+
+#include <set>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/gtest_prod_util.h"
+#include "base/string16.h"
+#include "chrome/browser/favicon/favicon_service.h"
+#include "ui/base/models/menu_model.h"
+#include "webkit/glue/window_open_disposition.h"
+#include "chrome/browser/sessions/tab_restore_service.h"
+
+class Browser;
+class TabRestoreService;
+
+namespace gfx {
+class ImageSkia;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+//
+// RecentlyClosedTabsMenuModel
+//
+// Interface for the showing of the dropdown menu for the newtab button.
+// Actual implementations are platform-specific.
+///////////////////////////////////////////////////////////////////////////////
+class RecentlyClosedTabsMenuModel : public ui::MenuModel {
+ public:
+  explicit RecentlyClosedTabsMenuModel(Browser* browser);
+  virtual ~RecentlyClosedTabsMenuModel();
+
+  // MenuModel implementation.
+  virtual bool HasIcons() const OVERRIDE;
+  // Returns total number of items the menu should show.
+  virtual int GetItemCount() const OVERRIDE;
+  virtual ItemType GetTypeAt(int index) const OVERRIDE;
+  virtual int GetCommandIdAt(int index) const OVERRIDE;
+  virtual string16 GetLabelAt(int index) const OVERRIDE;
+  virtual bool IsItemDynamicAt(int index) const OVERRIDE;
+  virtual bool GetAcceleratorAt(int index,
+                                ui::Accelerator* accelerator) const OVERRIDE;
+  virtual bool IsItemCheckedAt(int index) const OVERRIDE;
+  virtual int GetGroupIdAt(int index) const OVERRIDE;
+  virtual bool GetIconAt(int index, gfx::ImageSkia* icon) OVERRIDE;
+  virtual ui::ButtonMenuItemModel* GetButtonMenuItemAt(
+      int index) const OVERRIDE;
+  virtual bool IsEnabledAt(int index) const OVERRIDE;
+  virtual MenuModel* GetSubmenuModelAt(int index) const OVERRIDE;
+  virtual void HighlightChangedTo(int index) OVERRIDE;
+  virtual void ActivatedAt(int index) OVERRIDE;
+  virtual void ActivatedAt(int index, int event_flags) OVERRIDE;
+  virtual void MenuWillShow() OVERRIDE;
+
+  // Set the delegate for triggering OnIconChanged.
+  virtual void SetMenuModelDelegate(
+      ui::MenuModelDelegate* menu_model_delegate) OVERRIDE;
+
+ protected:
+   ui::MenuModelDelegate* menu_model_delegate() { return menu_model_delegate_; }
+
+ private:
+  TabRestoreService::Entry* GetNavigationEntryAt(int index) const;
+
+  int GetRecentlyClosedItemCount() const;
+
+  Browser* browser_;
+
+  // TabRestoreService that we are observing.
+  TabRestoreService* tab_restore_service_;
+
+  // Used for receiving notifications when an icon is changed.
+  ui::MenuModelDelegate* menu_model_delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(RecentlyClosedTabsMenuModel);
+};
+
+#endif  // CHROME_BROWSER_UI_TABS_RECENTLY_CLOSED_TABS_MENU_MODEL_H_