C++, ncurses: unable to display menu before a key is pressed - c++

Question

With a friend I am working on a tetris like game within a terminal. We are using ncurses to manage it and we have different "views". For example a view manages the grid while the other manages the Menu. However we have a problem: when we start the game, we need to press a key in order to see it, otherwise the window is empty.
Here is the code ran when we create the menu (the constructor):
MenuScreen::MenuScreen()
{
if (has_colors())
{
use_default_colors();
start_color();
init_pair(WHITEONRED, COLOR_WHITE, COLOR_RED);
init_pair(WHITEONBLUE, COLOR_WHITE, COLOR_BLUE);
init_pair(REDONWHITE, COLOR_RED, COLOR_WHITE);
}
char *choices[] = /* The menu choices */
{
(char *)" Solo ",
(char *)" Bot ",
(char *)" Tetrix ",
(char *)" Quitter ",
NULL};
/* Calculate nchoices */
for (n_choices = 0; choices[n_choices]; n_choices++)
;
/* alloction of an iteam array for the menu */
my_items = (ITEM **)calloc(n_choices + 1, sizeof(ITEM *));
for (ssChoice = 0; ssChoice < n_choices; ++ssChoice)
my_items[ssChoice] = new_item(choices[ssChoice], NULL);
my_items[n_choices] = (ITEM *)NULL;
/* menu structure creation */
my_menu = new_menu((ITEM **)my_items);
/* symbole on the left of selected iteam*/
set_menu_mark(my_menu, "> ");
/* Windows Border cration */
wBorder = newwin(8, 40, LINES / 2 - 8 / 2, COLS / 2 - 40 / 2);
registerWindow(wBorder);
wattrset(wBorder, COLOR_PAIR(WHITEONRED));
windowsFilling(wBorder);
box(wBorder, 0, 0);
windowsBorderTitle(wBorder, " option ");
wUI = derwin(wBorder, 8 - 2, 40 - 2, 2, 2);
registerWindow(wUI);
set_menu_sub(my_menu, wUI);
set_menu_fore(my_menu, COLOR_PAIR(REDONWHITE));
set_menu_back(my_menu, COLOR_PAIR(WHITEONRED));
/* menu display */
post_menu(my_menu);
}
And when the next key is pressed:
void MenuScreen::next()
{
menu_driver(my_menu, REQ_DOWN_ITEM);
update();
}
And here is what update() contains:
void MenuScreen::update()
{
touchwin(wUI);
wrefresh(wUI);
touchwin(wBorder);
wrefresh(wBorder);
}
If we remove update() from the next() function, the menu is no longer displayed when we press the next key, so we tried to add a call to update() at the end of the constructor, but this didn't work. We have no idea what could cause this bug. Here is our entire source code:
https://github.com/Th0rgal/poyuterm/tree/22e2422930a29fbe83414e382fd566c3eac69366
EDIT: Here is a minimal reproducible example made by my friend:
To build it, copy paste it in a menu.cpp file and type: g++ menu.cpp -o menu -lncurses -l menu
#include <stdlib.h> /* calloc() */
#include <string.h> /* strlen() */
#include <ncurses.h>
#include <menu.h>
#include <curses.h>
#define WHITEONRED 10
#define WHITEONBLUE 20
#define WHITEONBLACK 30
#define BLACKONWHITE 40
#define REDONWHITE 50
void windowsBorderTitle(WINDOW *pwin, const char *title)
{
int x, maxy, maxx, stringsize;
getmaxyx(pwin, maxy, maxx);
stringsize = 4 + strlen(title);
x = (maxx - stringsize) / 2;
mvwaddch(pwin, 0, x, ACS_RTEE);
waddch(pwin, ' ');
waddstr(pwin, title);
waddch(pwin, ' ');
waddch(pwin, ACS_LTEE);
}
void windowsFilling(WINDOW *pwin)
{
int y, x, maxy, maxx;
getmaxyx(pwin, maxy, maxx);
for (y = 0; y < maxy; y++)
for (x = 0; x < maxx; x++)
mvwaddch(pwin, y, x, ' ');
}
int main(int argc, char const *argv[])
{
initscr(); /* start ncurses */
cbreak(); /* immediately acquire each keystroke */
noecho(); /* do not echo user keystrokes */
keypad(stdscr, TRUE); /* enable detection of function keys */
int c;
ITEM **my_items;
MENU *my_menu;
WINDOW *wUI;
WINDOW *wBorder;
int n_choices;
int ssChoice;
int my_choice = -1;
if (has_colors())
{
use_default_colors();
start_color();
init_pair(WHITEONRED, COLOR_WHITE, COLOR_RED);
init_pair(WHITEONBLUE, COLOR_WHITE, COLOR_BLUE);
init_pair(REDONWHITE, COLOR_RED, COLOR_WHITE);
}
char *choices[] = /* The menu choices */
{
(char *)" Solo ",
(char *)" Bot ",
(char *)" Tetrix ",
(char *)" Quitter ",
NULL};
for(n_choices=0; choices[n_choices]; n_choices++);
/* ALLOCATE ITEM ARRAY AND INDIVIDUAL ITEMS */
my_items = (ITEM **)calloc(n_choices + 1, sizeof(ITEM *));
for(ssChoice = 0; ssChoice < n_choices; ++ssChoice)
my_items[ssChoice] = new_item(choices[ssChoice], NULL);
my_items[n_choices] = (ITEM *)NULL;
/* CREATE THE MENU STRUCTURE */
my_menu = new_menu((ITEM **)my_items);
/* PUT > TO THE LEFT OF HIGHLIGHTED ITEM */
set_menu_mark(my_menu, "> ");
/* SET UP WINDOW FOR MENU'S BORDER */
wBorder = newwin(16, 40, 2, 20);
wattrset(wBorder, COLOR_PAIR(WHITEONRED) | WA_BOLD);
windowsFilling(wBorder);
box(wBorder, 0, 0);
windowsBorderTitle(wBorder, "Choose one");
/* SET UP WINDOW FOR THE MENU'S USER INTERFACE */
wUI = derwin(wBorder, 16-2, 40-2, 2, 2);
/* ASSOCIATE THESE WINDOWS WITH THE MENU */
set_menu_win(my_menu, wBorder);
set_menu_sub(my_menu, wUI);
/* MATCH MENU'S COLORS TO THAT OF ITS WINDOWS */
set_menu_fore(my_menu, COLOR_PAIR(REDONWHITE));
set_menu_back(my_menu, COLOR_PAIR(WHITEONRED) | WA_BOLD);
/* SET UP AN ENVIRONMENT CONDUCIVE TO MENUING */
keypad(wUI, TRUE); /* enable detection of function keys */
noecho(); /* user keystrokes don't echo */
curs_set(0); /* make cursor invisible */
/* DISPLAY THE MENU */
post_menu(my_menu);
touchwin(wBorder);
wrefresh(wBorder);
while(my_choice == -1)
{
touchwin(wBorder);
wrefresh(wBorder);
touchwin(wUI); /* refresh prior to getch() */
wrefresh(wUI); /* refresh prior to getch() */
c = getch();
switch(c)
{
case KEY_DOWN:
menu_driver(my_menu, REQ_DOWN_ITEM);
break;
case KEY_UP:
menu_driver(my_menu, REQ_UP_ITEM);
break;
case 10: /* Enter */
my_choice = item_index(current_item(my_menu));
pos_menu_cursor(my_menu);
break;
}
}
unpost_menu(my_menu);
for(ssChoice = 0; ssChoice < n_choices; ++ssChoice)
free_item(my_items[ssChoice]);
free_menu(my_menu);
delwin(wUI);
delwin(wBorder);
touchwin(stdscr);
wrefresh(stdscr);
endwin();
}