Subj : Re: menu item choice question...?
To   : borland.public.cpp.borlandcpp
From : waking
Date : Fri Sep 16 2005 06:04 pm

On Thu, 15 Sep 2005 21:55:29 +0500, mujeebrm <mujeebrm@y!.com=yahoo> wrote:

>/* menu.c, bc 5.02/tc 3, winxp */
>/* plz help me in this logic, how can i modify this my program
>    of a simple menu so that when i press down arrow key it
>    makes previous items bgcolor black and fgcolor white and
>    selected items bgcolor red and fgcolor white and vice versa
>    and when i press enter it should call respective function
>    this should keep going on untill i press enter on exit menu item...?
[snip]

At this time, I have neither time nor inclination to analyze or modify your
example. See if this old example from my archives gives you some
ideas as to how to approach the problem:

/****************** LIGHTBAR.C ********************/
/** Based on Public Domain code by Roger Scudder **/
/** originally posted in the FIDO C_Echo - 01/96 **/
/** Compiled with Borland Turbo C++ v3.0 for DOS **/
/** -------------------------------------------- **/
/** Modifications made by Wayne A. King 03/96    **/
/** (1) Added HOME, END, PAGE_UP, and PAGE_DOWN  **/
/**     processing.                              **/
/** (2) Added roll-over of bar positioning when  **/
/**     at first or last item.                   **/
/** (3) Added menu item selection by number.     **/
/** (4) Added cursor on/off code.                **/
/** (5) Added display of menu selection at end.  **/
/**************************************************/
#include <stdlib.h>
#include <conio.h>

/* key values */
#define UP             72
#define DOWN           80
#define ESC            27
#define ENTER          13
#define HOME           71
#define END            79
#define PAGE_UP        73
#define PAGE_DOWN      81

/* limits */
#define NUM_ITEMS       4
#define FIRST_ROW       5

/* define an array of pointers to the menuitems */
char *item[NUM_ITEMS] = { "[1] Word Perfect 5.1   ",
                          "[2] Lotus 123          ",
                          "[3] Turbo C++ 3.0      ",
                          "[4] Qedit              "  };

void showlight(char *s, int col, int row) /* show menuitem highlighted */
{
    textcolor(BLACK);
    textbackground(WHITE);
    gotoxy(col, row);
    cputs(s);
    textcolor(LIGHTCYAN);
    textbackground(BLACK);
    gotoxy(col, row);
}

int menu(void) /* return: number of menuitem or -1 if Esc is pressed */
{
    int col = 30, row = FIRST_ROW, key, ext, i;

    clrscr();
    textcolor(WHITE);
    textbackground(BLACK);
    gotoxy(col, row-2);

    cputs(" >>>> PROGRAMS <<<<");

    textcolor(LIGHTCYAN);
    for(i = NUM_ITEMS - 1; i > 0; i--)
        {
        gotoxy(col, row + i);
        cputs(item[i]);
        }
    showlight(item[i] , col, row);

    /* handle user key strokes */
    for(;;)
    {
        ext = 0;
        if((key = getch()) == 0)
            ext = getch();

        switch(ext)
        {
            case PAGE_UP:
            case HOME:  cputs(item[row - FIRST_ROW]);
                        row = FIRST_ROW;
                        break;
            case PAGE_DOWN:
            case END:   cputs(item[row - FIRST_ROW]);
                        row = FIRST_ROW + NUM_ITEMS - 1;
                        break;
            case UP:    cputs(item[row - FIRST_ROW]);
                        if(row == FIRST_ROW)
                            {
                            row += NUM_ITEMS-1;
                            break;
                            }
                        if(row > FIRST_ROW)
                            row--;
                        break;
            case DOWN:  cputs(item[row - FIRST_ROW]);
                        if(row == FIRST_ROW + NUM_ITEMS - 1)
                            {
                            row -= NUM_ITEMS-1;
                            break;
                            }
                        if(row < FIRST_ROW + NUM_ITEMS - 1)
                           row++;
                        break;
        }
        if(key == ENTER) return row - FIRST_ROW;
        if(key == ESC) return -1;
        key -= 0x30;
        if(key > 0 && key <= NUM_ITEMS) /* menu item number */
            {
            cputs(item[row - FIRST_ROW]);
            row = FIRST_ROW+key-1;
            showlight(item[key-1], col, row);
            return key-1;
            }
        showlight(item[row - FIRST_ROW], col, row);
    }
}

int main(void)
{
    int itemno;

    _setcursortype(_NOCURSOR);
    itemno = menu();
    gotoxy(1, 24);
    if(itemno == -1) cprintf("Escape key pressed!");
    else cprintf("You selected menu item %s", item[itemno]);
    _setcursortype(_NORMALCURSOR);
    return EXIT_SUCCESS;
}

--
Wayne A. King 
(waking@idirect.com, Wayne_A_King@compuserve.com)

.