box-o-sand/curses-practice/menus/menu_win.c

#include <menu.h>

#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
#define CTRLD     4

char *choices[] = {
                        "Choice 1",
                        "Choice 2",
                        "Choice 3",
                        "Choice 4",
                        "Exit",
                        (char *)NULL,
                  };
void print_in_middle(WINDOW *win, int starty, int startx, int width, char *string, chtype color);

int main()
{    ITEM **my_items;
    int c;
    MENU *my_menu;
        WINDOW *my_menu_win;
        int n_choices, i;

    /* Initialize curses */
    initscr();
    start_color();
        cbreak();
        noecho();
    keypad(stdscr, TRUE);
    init_pair(1, COLOR_RED, COLOR_BLACK);

    /* Create items */
        n_choices = ARRAY_SIZE(choices);
        my_items = (ITEM **)calloc(n_choices, sizeof(ITEM *));
        for(i = 0; i < n_choices; ++i)
                my_items[i] = new_item(choices[i], choices[i]);

    /* Crate menu */
    my_menu = new_menu((ITEM **)my_items);

    /* Create the window to be associated with the menu */
        my_menu_win = newwin(10, 40, 4, 4);
        keypad(my_menu_win, TRUE);

    /* Set main window and sub window */
        set_menu_win(my_menu, my_menu_win);
        set_menu_sub(my_menu, derwin(my_menu_win, 6, 38, 3, 1));

    /* Set menu mark to the string " * " */
        set_menu_mark(my_menu, " * ");

    /* Print a border around the main window and print a title */
        box(my_menu_win, 0, 0);
    print_in_middle(my_menu_win, 1, 0, 40, "My Menu", COLOR_PAIR(1));
    mvwaddch(my_menu_win, 2, 0, ACS_LTEE);
    mvwhline(my_menu_win, 2, 1, ACS_HLINE, 38);
    mvwaddch(my_menu_win, 2, 39, ACS_RTEE);
    mvprintw(LINES - 2, 0, "F1 to exit");
    refresh();

    /* Post the menu */
    post_menu(my_menu);
    wrefresh(my_menu_win);

    while((c = wgetch(my_menu_win)) != KEY_F(1))
    {       switch(c)
            {    case KEY_DOWN:
                menu_driver(my_menu, REQ_DOWN_ITEM);
                break;
            case KEY_UP:
                menu_driver(my_menu, REQ_UP_ITEM);
                break;
        }
                wrefresh(my_menu_win);
    }

    /* Unpost and free all the memory taken up */
        unpost_menu(my_menu);
        free_menu(my_menu);
        for(i = 0; i < n_choices; ++i)
                free_item(my_items[i]);
    endwin();
}

void print_in_middle(WINDOW *win, int starty, int startx, int width, char *string, chtype color)
{    int length, x, y;
    float temp;

    if(win == NULL)
        win = stdscr;
    getyx(win, y, x);
    if(startx != 0)
        x = startx;
    if(starty != 0)
        y = starty;
    if(width == 0)
        width = 80;

    length = strlen(string);
    temp = (width - length)/ 2;
    x = startx + (int)temp;
    wattron(win, color);
    mvwprintw(win, y, x, "%s", string);
    wattroff(win, color);
    refresh();
}