box-o-sand/curses-practice/basics/simple_key.c

#include <stdio.h>
#include <ncurses.h>

#define WIDTH 30
#define HEIGHT 10

int startx = 0;
int starty = 0;

char *choices[] = {
            "Choice 1",
            "Choice 2",
            "Choice 3",
            "Choice 4",
            "Exit",
          };
int n_choices = sizeof(choices) / sizeof(char *);
void print_menu(WINDOW *menu_win, int highlight);

int main()
{    WINDOW *menu_win;
    int highlight = 1;
    int choice = 0;
    int c;

    initscr();
    clear();
    noecho();
    cbreak();    /* Line buffering disabled. pass on everything */
    startx = (80 - WIDTH) / 2;
    starty = (24 - HEIGHT) / 2;

    menu_win = newwin(HEIGHT, WIDTH, starty, startx);
    keypad(menu_win, TRUE);
    mvprintw(0, 0, "Use arrow keys to go up and down, Press enter to select a choice");
    refresh();
    print_menu(menu_win, highlight);
    while(1)
    {    c = wgetch(menu_win);
        switch(c)
        {    case KEY_UP:
                if(highlight == 1)
                    highlight = n_choices;
                else
                    --highlight;
                break;
            case KEY_DOWN:
                if(highlight == n_choices)
                    highlight = 1;
                else
                    ++highlight;
                break;
            case 10:
                choice = highlight;
                break;
            default:
                mvprintw(24, 0, "Charcter pressed is = %3d Hopefully it can be printed as '%c'", c, c);
                refresh();
                break;
        }
        print_menu(menu_win, highlight);
        if(choice != 0)    /* User did a choice come out of the infinite loop */
            break;
    }
    mvprintw(23, 0, "You chose choice %d with choice string %s\n", choice, choices[choice - 1]);
    clrtoeol();
    refresh();
    endwin();
    return 0;
}


void print_menu(WINDOW *menu_win, int highlight)
{
    int x, y, i;

    x = 2;
    y = 2;
    box(menu_win, 0, 0);
    for(i = 0; i < n_choices; ++i)
    {    if(highlight == i + 1) /* High light the present choice */
        {    wattron(menu_win, A_REVERSE);
            mvwprintw(menu_win, y, x, "%s", choices[i]);
            wattroff(menu_win, A_REVERSE);
        }
        else
            mvwprintw(menu_win, y, x, "%s", choices[i]);
        ++y;
    }
    wrefresh(menu_win);
}