Volume 7A: XView Programming Manual

The use of XV_KEY_DATA removes the need for the menu and the scrollbar to be global vari-

ables. It also clarifies the association between the objects that would otherwise not be as

clear. Other examples of XV_KEY_DATA, including a complete discussion on usage, can be

found in Chapter 7, Panels, and Chapter 3, Creating XView Applications.

11.6 Creating Menu Items

As noted, the use of MENU_STRINGS results in the creation of menu items in-line; that is, they

are created automatically by the MENU package during the creation of the menu object. Other

methods for creating menu items in-line include using the attributes, MENU_ITEM and

MENU_ACTION_ITEM.*

MENU_ACTION_ITEM is used as a shortcut for separately specifying a label and a callback

routine:

menu = (Menu)xv_create(NULL, MENU,

MENU_ACTION_ITEM, "item1", callback1,

MENU_ACTION_ITEM, "item2", callback2,

...

NULL);

Two other methods for creating menu items are to:

• Use a separate call to xv_create() with the MENUITEM package.

• Provide a menu-generation routine.

The following subsections discuss the use of MENU_ITEM to create menu items in-line,

MENUITEM to create separate menu items, and MENU_GEN_PROC to specify a routine that cre-

ates menus.

11.6.1 Using MENU_ITEM

Using the attribute MENU_ITEM indicates that a new menu item is to be created and appended

to the existing menu. Use of this attribute means that the menu item is created in-line so a

separate ...