Menu's and Sub-Menus

• Used to provide an interface for offering multiple options to the user
• Can have pulldown, hierarchical or popup menus.
• Pulldown menu's always appear at the top of the screen
• A menu can be created by the call :

  install_menu( Name, Item_list)

  where Name is the name of the menu as it appears on the bar and Item_list is a list of choices available for the menu.
• It is important to note that a predicate Name must also be produced in the program to handle the menu options. When a selection is made from the menu a call :

  Name(Item)

  is made, where Item is a member of Item_list

Consider the following example, which creates a four item menu with aura initially disabled, and a horizontal separating bar between do-bop and tutu.

install_menu('Miles',
 [sketches_of_spain, '(aura', amandala, dobop, 
    '(-','tutu/P']).

This is infact equivalent to doing :

install_menu('Miles',
 ['sketches_of_spain;(aura;amandala;dobop;(-;tutu/P']).

There MUST be a program to deal with the menu also, and must take the general form of :

'Miles'(sketches_of_spain) :-
	... code for sketches_of_spain option

'Miles'(aura) :-
	... code for aura option 	

etc

  
Figure 3: The Miles Menu added to the Menu Bar

  
Figure 4: The Miles Menu

 
• the Fruits menu - a multilevel menu
• Popup Menus