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

#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);
void report_choice(int mouse_x, int mouse_y, int *p_choice);

int main()
{    int c, choice = 0;
    WINDOW *menu_win;
    MEVENT event;

    /* Initialize curses */
    initscr();
    clear();
    noecho();
    cbreak();    //Line buffering disabled. pass on everything

    /* Try to put the window in the middle of screen */
    startx = (80 - WIDTH) / 2;
    starty = (24 - HEIGHT) / 2;

    attron(A_REVERSE);
    mvprintw(23, 1, "Click on Exit to quit (Works best in a virtual console)");
    refresh();
    attroff(A_REVERSE);

    /* Print the menu for the first time */
    menu_win = newwin(HEIGHT, WIDTH, starty, startx);
    print_menu(menu_win, 1);
    /* Get all the mouse events */
    mousemask(ALL_MOUSE_EVENTS, NULL);

    while(1)
    {    c = wgetch(menu_win);
        switch(c)
        {    case KEY_MOUSE:
            if(getmouse(&event) == OK)
            {    /* When the user clicks left mouse button */
                if(event.bstate & BUTTON1_PRESSED)
                {    report_choice(event.x + 1, event.y + 1, &choice);
                    if(choice == -1) //Exit chosen
                        goto end;
                    mvprintw(22, 1, "Choice made is : %d String Chosen is \"%10s\"", choice, choices[choice - 1]);
                    refresh();
                }
            }
            print_menu(menu_win, choice);
            break;
        }
    }
end:
    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)
        {    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);
}

/* Report the choice according to mouse position */
void report_choice(int mouse_x, int mouse_y, int *p_choice)
{    int i,j, choice;

    i = startx + 2;
    j = starty + 3;

    for(choice = 0; choice < n_choices; ++choice)
        if(mouse_y == j + choice && mouse_x >= i && mouse_x <= i + strlen(choices[choice]))
        {    if(choice == n_choices - 1)
                *p_choice = -1;
            else
                *p_choice = choice + 1;
            break;
        }
}