Source Code File 10-04_subsub

10-04_subsub.c

#include <ncurses.h>
   
int main()
{
    WINDOW *grandpa,*father,*son;
    int gl,gc;

    initscr();
    refresh();  /* update stdscr */
    
    /* set colors */
    start_color();
    init_pair(1,COLOR_WHITE,COLOR_BLUE);
    init_pair(2,COLOR_RED,COLOR_YELLOW);
    init_pair(3,COLOR_BLACK,COLOR_GREEN);
        
    /* create windows */
    grandpa = newwin(LINES-4,COLS-10,2,5);
    getmaxyx(grandpa,gl,gc);
    father = derwin(grandpa,gl/2,gc,gl/2,0);
    son = derwin(father,gl/2,3,0,(gc-4)/2);
    
    /* color windows and splash some text */
    wbkgd(grandpa,COLOR_PAIR(1));
    waddstr(grandpa,"I am Grandpa\n");
    wbkgd(father,COLOR_PAIR(2));
    waddstr(father,"I am Father\n");
    wclrtobot(father);
    wbkgd(son,COLOR_PAIR(3));
    waddstr(son,"I am the boy\n");
    wrefresh(grandpa);
    getch();
    
    endwin();
    return(0);
}

Output Screenshot

Notes

* The wbkgd() function may not fill a subwindow with color, which it would otherwise do to a primary window. This failure is one of the quirks of subwindows. To ensure that window father is filled with red text on yellow, I added a clrtobot() function at Line 28.

* This code lacks error-checking, which I removed to keep it compact.

← 10-03_sub3.c — 10-05_delsub.c →