>>>>>>>>>>>>>>>>>>>>>> Download file for GEM column #7 <<<<<<<<<<<<<<<<<<<<<
>>>>>>>>>>>>>>>>>>>>>>>>>>>> Sample Menu Tree <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

-1, 1, 6, G_IBOX, NONE, NORMAL, 0x0L, 0,0, 80,25,	/* ROOT */
6, 2, 2, G_BOX, NONE, NORMAL, 0x1100L, 0,0, 80,513,	/* THE BAR */
1, 3, 5, G_IBOX, NONE, NORMAL, 0x0L, 2,0, 20,769,	/* THE ACTIVE */
4, -1, -1, G_TITLE, NONE, NORMAL, 0x0L, 0,0, 6,769,	/* Title #1 */
5, -1, -1, G_TITLE, NONE, NORMAL, 0x1L, 6,0, 6,769,	/* Title #2 */
2, -1, -1, G_TITLE, NONE, NORMAL, 0x2L, 12,0, 8,769,	/* Title #3 */
0, 7, 22, G_IBOX, NONE, NORMAL, 0x0L, 0,769, 80,19,	/* THE SCREEN */
16, 8, 15, G_BOX, NONE, NORMAL, 0xFF1100L, 2,0, 20,8,	/* Drop-down #1 */
9, -1, -1, G_STRING, NONE, NORMAL, 0x3L, 0,0, 19,1,	/* About... entry */
10, -1, -1, G_STRING, NONE, DISABLED, 0x4L, 0,1, 20,1,
11, -1, -1, G_STRING, NONE, NORMAL, 0x5L, 0,2, 20,1,	/* Desk acc entries */
12, -1, -1, G_STRING, NONE, NORMAL, 0x6L, 0,3, 20,1,
13, -1, -1, G_STRING, NONE, NORMAL, 0x7L, 0,4, 20,1,
14, -1, -1, G_STRING, NONE, NORMAL, 0x8L, 0,5, 20,1,
15, -1, -1, G_STRING, NONE, NORMAL, 0x9L, 0,6, 20,1,
7, -1, -1, G_STRING, NONE, NORMAL, 0xAL, 0,7, 20,1,
22, 17, 21, G_BOX, NONE, NORMAL, 0xFF1100L, 8,0, 13,5,	/* Drop-down #2 */
18, -1, -1, G_STRING, NONE, NORMAL, 0xBL, 0,0, 13,1,
19, -1, -1, G_STRING, NONE, DISABLED, 0xCL, 0,1, 13,1,
20, -1, -1, G_STRING, NONE, NORMAL, 0xDL, 0,4, 13,1,
21, -1, -1, G_STRING, NONE, NORMAL, 0xEL, 0,2, 13,1,
16, -1, -1, G_STRING, NONE, DISABLED, 0xFL, 0,3, 13,1,
6, 23, 25, G_BOX, NONE, NORMAL, 0xFF1100L, 14,0, 26,3,	/* Drop down #3 */
24, -1, -1, G_STRING, NONE, NORMAL, 0x10L, 0,2, 26,1,
25, -1, -1, G_STRING, NONE, NORMAL, 0x11L, 0,0, 26,1,
22, -1, -1, G_STRING, LASTOB, DISABLED, 0x12L, 0,1, 26,1

>>>>>>>>>>>>>>>>>>>>>>>> Menu enable/disable utility <<<<<<<<<<<<<<<<<<<<<<

/*------------------------------*/
/*	undo_obj		*/
/*------------------------------*/
	VOID
undo_obj(tree, which, bit)
	LONG	tree;
	WORD	which;
	UWORD	bit;
	{
	WORD	state;

	state = LWGET(OB_STATE(which));
	LWSET(OB_STATE(which), state & ~bit);
	}

/*------------------------------*/
/*	enab_obj		*/
/*------------------------------*/
	WORD
enab_obj(tree, which)
	LONG	tree;
	WORD	which;
	{
	undo_obj(tree, which, (UWORD) DISABLED);
	return (TRUE);
	}

/*------------------------------*/
/*	do_obj  		*/
/*------------------------------*/
	VOID
do_obj(tree, which, bit)
	LONG	tree;
	WORD	which;
	UWORD	bit;
	{
	WORD	state;

	state = LWGET(OB_STATE(which));
	LWSET(OB_STATE(which), state | bit);
	}

/*------------------------------*/
/*	disab_obj		*/
/*------------------------------*/
	WORD
disab_obj(tree, which)
	LONG	tree;
	WORD	which;
	{
	do_obj(tree, which, (UWORD) DISABLED);
	return (TRUE);
	}

/*------------------------------*/
/*	set_menu		*/
/*------------------------------*/
	VOID
set_menu(tree, change)			/* change[0] TRUE selects all entries*/
	LONG	tree;			/* FALSE deselects all.  Change list */
	WORD	*change;		/* of items is then toggled.	     */
	{
	WORD	dflt, screen, drop, obj;

	dflt = *change++;			/* What is default?   */
	screen = LWGET(OB_TAIL(ROOT));		/* Get SCREEN 	      */
	drop = LWGET(OB_HEAD(screen));		/* Get DESK drop-down */
						/* and skip it        */
	for (; (drop = LWGET(OB_NEXT(drop))) != screen; )
		{
		obj = LWGET(OB_HEAD(drop));
		if (obj != NIL)
		if (dflt)
			map_tree(tree, obj, drop, enab_obj);
		else
			map_tree(tree, obj, drop, disab_obj);
		}

	for (; *change; change++)
		if (dflt)
			disab_obj(tree, *change);
		else
			enab_obj(tree, *change);
	}

>>>>>>>>>>>>>>>>>>>>> Definitions used in this article <<<<<<<<<<<<<<<<<<<<<<

#define ROOT 0

#define G_IBOX    25
#define G_STRING  28
#define G_TITLE   32

#define R_TREE     0

#define MN_SELECTED 10

#define CHECKED   0x4
#define DISABLED  0x8

#define OB_NEXT(x) (tree + (x) * sizeof(OBJECT) + 0)
#define OB_HEAD(x) (tree + (x) * sizeof(OBJECT) + 2)
#define OB_TAIL(x) (tree + (x) * sizeof(OBJECT) + 4)
#define OB_TYPE(x) (tree + (x) * sizeof(OBJECT) + 6)
#define OB_FLAGS(x) (tree + (x) * sizeof(OBJECT) + 8)
#define OB_STATE(x) (tree + (x) * sizeof(OBJECT) + 10)
#define OB_SPEC(x) (tree + (x) * sizeof(OBJECT) + 12)
#define OB_X(x) (tree + (x) * sizeof(OBJECT) + 16)
#define OB_Y(x) (tree + (x) * sizeof(OBJECT) + 18)
#define OB_WIDTH(x) (tree + (x) * sizeof(OBJECT) + 20)
#define OB_HEIGHT(x) (tree + (x) * sizeof(OBJECT) + 22)

#define M_OFF     256
#define M_ON      257