alternate ntp: add "Recent Tabs" submenu to wrench menu

chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.h

+// Copyright 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_TOOLBAR_RECENT_TABS_SUB_MENU_MODEL_H_
+#define CHROME_BROWSER_UI_TOOLBAR_RECENT_TABS_SUB_MENU_MODEL_H_
+
+#include <set>
+
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/favicon/favicon_service.h"
+#include "chrome/browser/sessions/tab_restore_service.h"
+#include "ui/base/accelerators/accelerator.h"
+#include "ui/base/models/simple_menu_model.h"
+
+class Browser;
+struct SessionTab;
+
+namespace browser_sync {
+class SessionModelAssociator;
+}
+
+namespace gfx {
+class Image;
+}
+
+namespace ui {
+class AcceleratorProvider;
+}
+
+// A menu model that builds the contents of "Recent tabs" submenu, which include
+// the last closed tab and opened tabs of other devices.
+class RecentTabsSubMenuModel : public ui::SimpleMenuModel,
+                               public ui::SimpleMenuModel::Delegate {
+ public:
+  // If |associator| is NULL, default associator for |browser|'s profile will
+  // be used.  Testing may require a specific |associator|.
+  RecentTabsSubMenuModel(ui::AcceleratorProvider* accelerator_provider,
+                         Browser* browser,
+                         browser_sync::SessionModelAssociator* associator);
+  virtual ~RecentTabsSubMenuModel();
+
+  // Overridden from ui::SimpleMenuModel::Delegate:
+  virtual bool IsCommandIdChecked(int command_id) const OVERRIDE;
+  virtual bool IsCommandIdEnabled(int command_id) const OVERRIDE;
+  virtual bool GetAcceleratorForCommandId(
+      int command_id,
+      ui::Accelerator* accelerator) OVERRIDE;
+  virtual bool IsItemForCommandIdDynamic(int command_id) const OVERRIDE;
+  virtual string16 GetLabelForCommandId(int command_id) const OVERRIDE;
+  virtual void ExecuteCommand(int command_id) OVERRIDE;
+  virtual void ExecuteCommand(int command_id, int event_flags) OVERRIDE;
+
+ private:
+  struct NavigationItem;
+  typedef std::vector<NavigationItem> NavigationItems;
+
+  // Build the menu items by populating the model.
+  void Build();
+  void BuildLastClosed();
+  void BuildDevices();
+  void BuildForeignTabItem(const std::string& session_tag,
+                           const SessionTab& tab,
+                           const std::string& session_name,
+                           bool need_separator);
+  void AddFavicon(int model_index, int command_id, const GURL& url);
+  void OnFaviconDataAvailable(FaviconService::Handle handle,
+                              const history::FaviconImageResult& image_result);
+  browser_sync::SessionModelAssociator* GetModelAssociator();
+
+  Browser* browser_;  // Weak.
+
+  browser_sync::SessionModelAssociator* associator_;  // Weak.
+
+  // Accelerator for reopening last closed tab.
+  ui::Accelerator reopen_closed_tab_accelerator_;
+
+  // Navigation items.  The |command_id| is set to kFirstTabCommandId plus the
+  // index into this vector.  Upon invocation of the menu, the navigation
+  // information is retrieved from |model_| and used to navigate to the item
+  // specified.
+  NavigationItems model_;
+
+  gfx::Image default_favicon_;
+
+  CancelableRequestConsumerTSimple<int> favicon_consumer_;
+
+  base::WeakPtrFactory<RecentTabsSubMenuModel> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(RecentTabsSubMenuModel);
+};
+
+#endif  // CHROME_BROWSER_UI_TOOLBAR_RECENT_TABS_SUB_MENU_MODEL_H_