subscl.c

BeginningLinuxProgramming example6

/*  First, the initial code section. The base window display is initialized with some text.  */

#include <unistd.h>
#include <stdlib.h>
#include <curses.h>

int main() 
{
    WINDOW *sub_window_ptr;
    int x_loop;
    int y_loop;
    int counter;
    char a_letter = '1';

    initscr();

    for (x_loop = 0; x_loop < COLS - 1; x_loop++) {
        for (y_loop = 0; y_loop < LINES - 1; y_loop++) {
            mvwaddch(stdscr, y_loop, x_loop, a_letter);
            a_letter++;
            if (a_letter > '9') a_letter = '1';
        }
    }

/*  We now create the new scrolling subwindow
    and, as advised, we must 'touch' the parent window before refreshing the screen.  */

    sub_window_ptr = subwin(stdscr, 10, 20, 10, 10);
    scrollok(sub_window_ptr, 1);

    touchwin(stdscr);
    refresh();
    sleep(1);

/*  Then we erase the contents of the subwindow, print text to it and refresh it.
    The scrolling text is achieved by a loop.  */

    werase(sub_window_ptr);
    mvwprintw(sub_window_ptr, 2, 0, "%s", "This window will now scroll");
    wrefresh(sub_window_ptr);
    sleep(1);

    for (counter = 1; counter < 10; counter++) {
        wprintw(sub_window_ptr, "%s", "This text is both wrapping and \
                    scrolling.");
        wrefresh(sub_window_ptr);
        sleep(1);
    }

/*  Having finished this loop, we delete the subwindow. Then we refresh the base screen.  */

    delwin(sub_window_ptr);

    touchwin(stdscr);
    refresh();
    sleep(1);

    endwin();
    exit(EXIT_SUCCESS);
}