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// Copyright (c) 2009 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 APP_MENUS_SIMPLE_MENU_MODEL_H_
#define APP_MENUS_SIMPLE_MENU_MODEL_H_
#include <vector>
#include "base/string16.h"
#include "app/menus/menu_model.h"
namespace menus {
// A simple MenuModel implementation with an imperative API for adding menu
// items. This makes it easy to construct fixed menus. Menus populated by
// dynamic data sources may be better off implementing MenuModel directly.
// The breadth of MenuModel is not exposed through this API.
class SimpleMenuModel : public MenuModel {
public:
class Delegate {
public:
// Methods for determining the state of specific command ids.
virtual bool IsCommandIdChecked(int command_id) const = 0;
virtual bool IsCommandIdEnabled(int command_id) const = 0;
// Gets the accelerator for the specified command id. Returns true if the
// command id has a valid accelerator, false otherwise.
virtual bool GetAcceleratorForCommandId(
int command_id,
menus::Accelerator* accelerator) = 0;
// Some command ids have labels that change over time.
virtual bool IsLabelForCommandIdDynamic(int command_id) const {
return false;
}
virtual string16 GetLabelForCommandId(int command_id) const {
return string16();
}
// Notifies the delegate that the item with the specified command id was
// visually highlighted within the menu.
virtual void CommandIdHighlighted(int command_id) {}
// Performs the action associated with the specified command id.
virtual void ExecuteCommand(int command_id) = 0;
};
// The Delegate can be NULL, though if it is items can't be checked or
// disabled.
explicit SimpleMenuModel(Delegate* delegate);
virtual ~SimpleMenuModel();
// Methods for adding items to the model.
void AddItem(int command_id, const string16& label);
void AddItemWithStringId(int command_id, int string_id);
void AddSeparator();
void AddCheckItem(int command_id, const string16& label);
void AddCheckItemWithStringId(int command_id, int string_id);
void AddRadioItem(int command_id, const string16& label, int group_id);
void AddRadioItemWithStringId(int command_id, int string_id, int group_id);
void AddSubMenu(const string16& label, MenuModel* model);
void AddSubMenuWithStringId(int string_id, MenuModel* model);
// Overridden from MenuModel:
virtual bool HasIcons() const;
virtual int GetItemCount() const;
virtual 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 void HighlightChangedTo(int index);
virtual void ActivatedAt(int index);
virtual MenuModel* GetSubmenuModelAt(int index) const;
protected:
// Some variants of this model (SystemMenuModel) relies on items to be
// inserted backwards. This is counter-intuitive for the API, so rather than
// forcing customers to insert things backwards, we return the indices
// backwards instead. That's what this method is for. By default, it just
// returns what it's passed.
virtual int FlipIndex(int index) const { return index; }
private:
struct Item {
int command_id;
string16 label;
ItemType type;
int group_id;
MenuModel* submenu;
};
std::vector<Item> items_;
Delegate* delegate_;
DISALLOW_COPY_AND_ASSIGN(SimpleMenuModel);
};
} // namespace menus
#endif // APP_MENUS_SIMPLE_MENU_MODEL_H_
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