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decodemenu.mod
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1994-10-14
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(*
This file contains procedures that extract menu,
item and subitem numbers from the code returned by
Intuition. This works with V1.1
See Intuition Manual V1.1 pages 6-9..6-12
Created: 5/25/86 by Richie Bielak
Modified:
Copyright (c) 1986 by Richard Bielak
This program may be freely copied, but please
leave my name in. Thanks.....Richie
*)
IMPLEMENTATION MODULE DecodeMenu;
TYPE
ShortSet = SET OF [0..15];
(* ++++++++++++++++++++++++++++ *)
(* Extract menu number *)
PROCEDURE MenuNumber (code : CARDINAL) : CARDINAL;
BEGIN
(* Zero out everything, but the lower 5 bits *)
RETURN CARDINAL (ShortSet (code) * ShortSet (01FH))
END MenuNumber;
(* ++++++++++++++++++++++++++++ *)
(* Extract item number. *)
PROCEDURE ItemNumber (code : CARDINAL) : CARDINAL;
BEGIN
(* Shift right by 5 positions *)
code := code DIV 20H;
(* Zero out, all but lower 6 bits *)
RETURN CARDINAL (ShortSet (code) * ShortSet (03FH));
END ItemNumber;
(*+++++++++++++++++++++++++*)
(* Extract Sub-item number *)
PROCEDURE SubItemNumber (code : CARDINAL) : CARDINAL;
BEGIN
(* Shift right by 11 bits *)
code := code DIV 400H;
(* Zero out all, but lower 5 bits *)
RETURN CARDINAL (ShortSet (code) * ShortSet (01FH));
END SubItemNumber;
END DecodeMenu.