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

NAME

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

SYNOPSIS

       #include <InterViews/menu.h>

DESCRIPTION

       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.

PUBLIC OPERATIONS

       Menu::Menu(Interactor*)
	      Construct a new menu.

       Menu::~Menu()
	      The destructor deletes the menu body in addition to its appearance component.

       virtual void Menu::Include(Control*)
	      Add an item to the menu.	If no scene is specified, Menu will create a vbox and insert items into it.

       virtual void Menu::Popup(Event&)
	      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).

       void Menu::SetBody(Interactor*)
       Interactor* Menu::GetBody()
       void Menu::SetAlign(Alignment)
       Alignment Menu::GetAlign()
       void Menu::SetDepth(int)
       int GetDepth()
       void Menu::SetBodyState(ControlState*)
       ControlState* Menu::GetBodyState()
       void Menu::SetScene(Scene*)
       Scene* Menu::GetScene()
	      Set or get attributes of the menu.  The depth of a menu is the number of pixels separating the body and the drop shadow.

       Coord Menu::InsertX()
       Coord Menu::InsertY()
	      Return the coordinates where the menu's body was last inserted into the world.

       MenuItem::MenuItem(Interactor*)
       MenuItem::MenuItem(const char* str, Alignment = Left)
	      Construct a new menu item.  The second constructor defines the appearance of the item to be a message containing the text in str.

       PulldownMenu::PulldownMenu(Interactor*)
       PulldownMenu::PulldownMenu(const char* str)
       PullrightMenu::PullrightMenu(Interactor*)
       PullrightMenu::PullrightMenu(const char* 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.

       PopupMenu::PopupMenu()
	      Construct a new popup menu.

       MenuBar::MenuBar()
	      Construct a new menu bar.

       virtual void MenuBar::Include(Control*)
	      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.

SEE ALSO

       Control(3I), Event(3I)

InterViews							  6 December 1989							  Menu(3I)