Add MenuModelAdapter to wrap ui::MenuModel with views::MenuDelegate interface.

views/controls/menu/menu_model_adapter.h

+// Copyright (c) 2011 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 VIEWS_CONTROLS_MENU_MENU_MODEL_ADAPTER_H_
+#define VIEWS_CONTROLS_MENU_MENU_MODEL_ADAPTER_H_
+#pragma once
+
+#include <map>
+
+#include "views/controls/menu/menu_delegate.h"
+
+namespace ui {
+class MenuModel;
+}
+
+namespace views {
+class MenuItemView;
+
+// This class wraps an instance of ui::MenuModel with the
+// views::MenuDelegate interface required by views::MenuItemView.
+class MenuModelAdapter : public MenuDelegate {
+ public:
+  // The caller retains ownership of the ui::MenuModel instance and
+  // must ensure it exists for the lifetime of the adapter.  The
+  // base_id argument is the command id for the first menu item.
+  explicit MenuModelAdapter(ui::MenuModel* menu_model);
+
+  // Populate a MenuItemView menu with the ui::MenuModel items
+  // (including submenus).
+  virtual void BuildMenu(MenuItemView* menu);
+
+ protected:
+  // views::MenuDelegate implementation.
+  virtual void ExecuteCommand(int id) OVERRIDE;
+  virtual void ExecuteCommand(int id, int mouse_event_flags) OVERRIDE;
+  virtual bool GetAccelerator(int id,
+                              views::Accelerator* accelerator) OVERRIDE;
+  virtual std::wstring GetLabel(int id) const OVERRIDE;
+  virtual const gfx::Font& GetLabelFont(int id) const OVERRIDE;
+  virtual bool IsCommandEnabled(int id) const OVERRIDE;
+  virtual bool IsItemChecked(int id) const OVERRIDE;
+  virtual void SelectionChanged(MenuItemView* menu) OVERRIDE;
+  virtual void WillShowMenu(MenuItemView* menu) OVERRIDE;
+
+ private:
+  // Implementation of BuildMenu().  index_offset is both input and output;
+  // on input it contains the offset from index to command id for the model,
+  // and on output it contains the offset for the next model.
+  void BuildMenuImpl(MenuItemView* menu, ui::MenuModel* model);
+
+  // Container of ui::MenuModel pointers as encountered by preorder
+  // traversal.  The first element is always the top-level model
+  // passed to the constructor.
+  ui::MenuModel* menu_model_;
+
+  // Map MenuItems to MenuModels.  Used to implement WillShowMenu().
+  std::map<MenuItemView*, ui::MenuModel*> menu_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(MenuModelAdapter);
+};
+
+}  // namespace views
+
+#endif  // VIEWS_CONTROLS_MENU_MENU_MODEL_ADAPTER_H_