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// Copyright (c) 2010 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_WRAPPER_H_
#define VIEWS_CONTROLS_MENU_MENU_WRAPPER_H_
#pragma once
#include "gfx/native_widget_types.h"
namespace gfx {
class Point;
}
namespace views {
class Menu2;
// An interface for clients that want a notification when a menu is opened.
class MenuListener {
public:
// This will be called after the menu has actually opened.
virtual void OnMenuOpened() = 0;
};
// An interface that wraps an object that implements a menu.
class MenuWrapper {
public:
// All of the possible actions that can result from RunMenuAt.
enum MenuAction {
MENU_ACTION_NONE, // Menu cancelled, or never opened.
MENU_ACTION_SELECTED, // An item was selected.
MENU_ACTION_PREVIOUS, // User wants to navigate to the previous menu.
MENU_ACTION_NEXT, // User wants to navigate to the next menu.
};
virtual ~MenuWrapper() {}
// Runs the menu at the specified point. This blocks until done.
virtual void RunMenuAt(const gfx::Point& point, int alignment) = 0;
// Cancels the active menu.
virtual void CancelMenu() = 0;
// Called when the model supplying data to this menu has changed, and the menu
// must be rebuilt.
virtual void Rebuild() = 0;
// Called when the states of the items in the menu must be updated from the
// model.
virtual void UpdateStates() = 0;
// Retrieve a native menu handle.
virtual gfx::NativeMenu GetNativeMenu() const = 0;
// Get the result of the last call to RunMenuAt to determine whether an
// item was selected, the user navigated to a next or previous menu, or
// nothing.
virtual MenuAction GetMenuAction() const = 0;
// Add a listener to receive a callback when the menu opens.
virtual void AddMenuListener(MenuListener* listener) = 0;
// Remove a menu listener.
virtual void RemoveMenuListener(MenuListener* listener) = 0;
// Creates the appropriate instance of this wrapper for the current platform.
static MenuWrapper* CreateWrapper(Menu2* menu);
};
} // namespace views
#endif // VIEWS_CONTROLS_MENU_MENU_WRAPPER_H_
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