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Menu(3I) InterViews Reference Manual Menu(3I)


Menu, MenuItem, MenuBar, PopupMenu, PulldownMenu, PullrightMenu - menus


#include <InterViews/menu.h>


N.B.: This Menu class is completely different from the Menu class in version 2.5. No attempt has been made to be compatible, as this class and its subclasses are more powerful and easier to use than the original class.

Menu is a subclass of Control that contains a scene of other controls, called its body. When a menu is opened, it inserts the body into the world with a drop shadow. The appearance of the menu itself is defined by its interactor component. For example, a menu in a menu bar might appear as ``File'' and insert a pulldown menu with commands such as ``Save'' when opened.

MenuItem is a subclass of Control for defining the leaves of a menu hierarchy. Normally, an application will derive a command class from MenuItem and implement the virtual function Do as appropriate. One technique is to pass the Command an application object and pointer to member function; the Do function calls the member function on the application object.

PopupMenu, PulldownMenu, and PullrightMenu are subclasses of Menu that implement a common styles of menus. MenuBar is a subclass of HBox that manages the control state associated with a set of menus. PopupMenu has no appearance; it is opened explicitly in response to an input event. PulldownMenu and PullrightMenu open the menu body below and to the right of the menu, respectively. These classes make it possible to use menus in an application without creating or passing control states explicitly.


Construct a new menu.
The destructor deletes the menu body in addition to its appearance component.
Add an item to the menu. If no scene is specified, Menu will create a vbox and insert items into it.
Insert the body into the world centered around the coordinates associated with the event and activate the controls in the body. The menu is removed from the world when the controls are deactivated (normally when a button is released).
Set or get attributes of the menu. The depth of a menu is the number of pixels separating the body and the drop shadow.
Return the coordinates where the menu's body was last inserted into the world.
Construct a new menu item. The second constructor defines the appearance of the item to be a message containing the text in str.
Construct a new pulldown or pullright menu. The second constructor defines the appearance of the menu to be a message containing the text in str.
Construct a new popup menu.
Construct a new menu bar.
Add a control to a menu bar. In addition to inserting the control into the bar's hbox, this operation attaches the control to the bar's control state.


Control(3I), Event(3I)

6 December 1989 InterViews