Messages to the user

• There are four ways to give messages to the user - i.e. where no user input is required directly
• These predefined dialogs are :

  message(Term_list)
  warning(Term_list)
  errormessage(Term_list)
  banner(Call,Message,T,L)

• The Term_list corresponds a list of items (message) to be displayed
• Call in the banner case refers to a goal or predicate to be executed - and Message is the message to be displayed to the user - T and L correspond to the top and left coordinates of the banner window
• Note that all of these dialogs are Modal

availability(Album) :-
 album(Album),
 message([Album,' can be found in section 2 of the store.']).

album(sketches_of_spain).
album(aura).

warn :-
 warning(['Uncle Sam is looking at you!']).

error :-
  errormessage(['Uncle Sam wants you dead']).

longwait(0).
longwait(X) :- 
 X1 is X-1,
 longwait(X1).

flag :-
 banner(longwait(1000),['Please wait...'],50,10).

  
Figure 6: The message dialog

  
Figure 7: The Modal warning dialog

  
Figure 8: The Modal error message dialog

  
Figure 9: The Modal banner dialog