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gtk_menu_attach_to_widget (GTK_MENU (menu), progress, NULL); gtk_widget_show_all (menu); } In most cases, you will want to use button-press-event to detect when the user wants the pop-up menu to be shown. This allows you to check whether the right mouse button was clicked. If the right mouse button was clicked, GdkEventButton s button member will be equal to 3. However, GtkWidget also provides the popup-menu signal, which is activated when the user presses built-in key accelerators to activate the pop-up menu. Most users will use the mouse to activate pop-up menus, so this is not usually a factor in GTK+ applications. Nevertheless, if you would like to handle this signal as well, you should create a third function that displays the pop-up menu that is called by both callback functions. New menus are created with gtk_menu_new(). The menu is initialized with no initial content, so the next step is to create menu items. In this section, we will cover two types of menu items. The first is the base class for all other types of menu items, GtkMenuItem. There are three initialization functions provided for GtkMenuItem: gtk_menu_item_new(), gtk_menu_item_new_with_label(), and gtk_menu_ item_new_with_mnemonic(). GtkWidget* gtk_menu_item_new_with_label (const gchar *label); In most cases, you will not need to use the gtk_menu_item_new(), because a menu item with no content is not of much use. If you use that function to initialize the menu item, you will have to construct each aspect of the menu in code instead of allowing GTK+ to handle the specifics.

Mixed Mode (/clr Compiler Option)

Note Menu item mnemonics are not the same thing as keyboard accelerators. A mnemonic will activate the menu item when the user presses Alt and the appropriate alphanumeric key while the menu has focus. A keyboard accelerator is a custom key combination that will cause a callback function to be run when the combination is pressed. You will learn about keyboard accelerators for menus in the next section.

These boundaries are artificial and can easily be overstepped. However, the point of the boundaries is to make the software process manageable and, more importantly, controllable from a developer and manager perspective.

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In mixed mode, in addition to having the managed types and the .NET Framework available, you as a programmer in the C++ language with the C++/CLI extensions may use classic C++ code and libraries if needed. In fact, you can compile nearly all classic C++ code with the /clr option. The C++ language as extended by the C++/CLI language extensions is (for all practical purposes) a superset of the classic C++, so any C++ application is automatically a C++/CLI application provided that you compile with the /clr option. Mixed mode lets you decide how much you want to transition your existing code to make use of the managed world. Your existing code will work in the managed world, and you are free to use managed constructs as needed and enjoy the benefits. Your mixed-mode assemblies are still capable of exporting native functions, importing COM libraries, using inline assembly, compiler intrinsics, and so on, which are not available in pure or safe mode. You should be aware of the limitations of mixed-mode code. Mixed-mode assemblies cannot be used with reflection (discussed in 10), because the reflection mechanism doesn t understand native types and functions. Pure mode does support reflection. Mixedmode code is also tied to a specific processor, since it may contain machine instructions for that processor; mixed-mode binaries cannot be loaded in contexts that require a platformagnostic binary.

The other type of basic menu item is GtkSeparatorMenuItem, which places a generic separator at its location. You can use gtk_separator_menu_item_new() to create a new separator menu item.

Separators are extremely important when designing a menu structure, because they organize menu items into groups so that the user can easily find the appropriate item For example, in the File menu, menu items are often organized into groups that open files, save files, print files, and close the application Rarely should you have many menu items listed without a separator in between them (eg, a list of recent files might appear without a separator) In most cases, you should group similar menu items together and place a separator between adjacent groups After the menu items are created, you need to connect each menu item to the activate signal, which is emitted when the user selects the item Alternatively, you can use the activate-item signal, which will additionally be emitted when a submenu of the given menu item is displayed.

Managed Extensions Syntax (/clr:oldSyntax Compiler Option)

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