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// 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 UI_VIEWS_CONTROLS_MENU_NATIVE_MENU_WIN_H_
#define UI_VIEWS_CONTROLS_MENU_NATIVE_MENU_WIN_H_
#include <memory>
#include <vector>
#include "base/macros.h"
#include "base/strings/string16.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/views/views_export.h"
namespace ui {
class MenuModel;
}
namespace views {
class MenuInsertionDelegateWin;
// A wrapper around a native Windows menu.
class VIEWS_EXPORT NativeMenuWin {
public:
// Construct a NativeMenuWin, with a model and delegate. If |system_menu_for|
// is non-NULL, the NativeMenuWin wraps the system menu for that window.
// The caller owns the model and the delegate.
NativeMenuWin(ui::MenuModel* model, HWND system_menu_for);
~NativeMenuWin();
void Rebuild(MenuInsertionDelegateWin* delegate);
void UpdateStates();
private:
// IMPORTANT: Note about indices.
// Functions in this class deal in two index spaces:
// 1. menu_index - the index of an item within the actual Windows
// native menu.
// 2. model_index - the index of the item within our model.
// These two are most often but not always the same value! The
// notable exception is when this object is used to wrap the
// Windows System Menu. In this instance, the model indices start
// at 0, but the insertion index into the existing menu is not.
// It is important to take this into consideration when editing the
// code in the functions in this class.
// Returns true if the item at the specified index is a separator.
bool IsSeparatorItemAt(int menu_index) const;
// Add items. See note above about indices.
void AddMenuItemAt(int menu_index, int model_index);
void AddSeparatorItemAt(int menu_index, int model_index);
// Sets the state of the item at the specified index.
void SetMenuItemState(int menu_index,
bool enabled,
bool checked,
bool is_default);
// Sets the label of the item at the specified index.
void SetMenuItemLabel(int menu_index,
int model_index,
const base::string16& label);
// Updates the local data structure with the correctly formatted version of
// |label| at the specified model_index, and adds string data to |mii| if
// the menu is not owner-draw. That's a mouthful. This function exists because
// of the peculiarities of the Windows menu API.
void UpdateMenuItemInfoForString(MENUITEMINFO* mii,
int model_index,
const base::string16& label);
// Resets the native menu stored in |menu_| by destroying any old menu then
// creating a new empty one.
void ResetNativeMenu();
// Our attached model and delegate.
ui::MenuModel* model_;
HMENU menu_;
// True if the contents of menu items in this menu are drawn by the menu host
// window, rather than Windows.
bool owner_draw_;
// An object that collects all of the data associated with an individual menu
// item.
struct ItemData;
std::vector<std::unique_ptr<ItemData>> items_;
// The HWND this menu is the system menu for, or NULL if the menu is not a
// system menu.
HWND system_menu_for_;
// The index of the first item in the model in the menu.
int first_item_index_;
// If we're a submenu, this is our parent.
NativeMenuWin* parent_;
// If non-null the destructor sets this to true. This is set to non-null while
// the menu is showing. It is used to detect if the menu was deleted while
// running.
bool* destroyed_flag_;
DISALLOW_COPY_AND_ASSIGN(NativeMenuWin);
};
} // namespace views
#endif // UI_VIEWS_CONTROLS_MENU_NATIVE_MENU_WIN_H_
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