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/*********************************************************************
* [program] overwrite() - Play with overwrite() function to *
* attempt pop-up windows. *
* ----------------------------------------------------------------- *
* [written] 1-Feb-1993 by Neal Ensor (ensor@cs.utk.edu) *
* ----------------------------------------------------------------- *
* [notes] Originally written on SVR4 UNIX, then recompiled on *
* Linux (Slackware 1.1.1, ncurses 1.8.1) *
* ----------------------------------------------------------------- *
* [problem] On ncurses, the overwrite() function doesn't seem to *
* overwrite. Maybe I'm missing something, but this *
* program in SVR4 displays three windows, waits for a *
* keypress, then removes the top window. With ncurses, *
* nothing changes on the display. *
*********************************************************************/
# include <ncurses.h> /* ncurses include lives here */
main()
{
/****************************************************************
* Declare three little window pointers... *
****************************************************************/
WINDOW *win, *win1, *win2;
/****************************************************************
* Set up the screen... *
****************************************************************/
initscr();
traceon();
noecho();
nonl();
cbreak();
refresh();
/****************************************************************
* Draw three overlapping windows. *
****************************************************************/
win=newwin(6,45, 6,6);
win1=newwin(10,20,5,5);
win2=newwin(10,30,7,7);
/****************************************************************
* Box them, and print a hidden message... *
****************************************************************/
box(win, 0, 0);
box(win1, 0, 0);
box(win2, 0, 0);
mvwprintw(win1, 6,6, "Hey!");
mvwaddch(win, 1, 1, '0');
mvwaddch(win1, 1, 1, '1');
mvwaddch(win2, 1, 1, '2');
wnoutrefresh(win);
wnoutrefresh(win1);
wnoutrefresh(win2);
doupdate();
/****************************************************************
* Await a keypress to show what we've done so far. *
****************************************************************/
getch();
/****************************************************************
* Now, overwrite win2 with contents of all lower windows IN *
* ORDER from the stdscr up... *
****************************************************************/
if (overwrite(stdscr, win2) == ERR)
fprintf(stderr, "overwrite(stdscr, win2) failed!\n");
touchwin(stdscr); wnoutrefresh(stdscr);
touchwin(win); wnoutrefresh(win);
touchwin(win1); wnoutrefresh(win1);
touchwin(win2); wnoutrefresh(win2);
doupdate();
getch();
if (overwrite(win, win2) == ERR)
fprintf(stderr, "overwrite(win, win2) failed!\n");
touchwin(stdscr); wnoutrefresh(stdscr);
touchwin(win); wnoutrefresh(win);
touchwin(win1); wnoutrefresh(win1);
touchwin(win2); wnoutrefresh(win2);
doupdate();
getch();
if (overwrite(win1, win2) == ERR)
fprintf(stderr, "overwrite(win1, win2) failed!\n");
/****************************************************************
* Perform touches, and hidden refreshes on each window. *
* ------------------------------------------------------------ *
* NOTE: If you replace the wnoutrefresh() call with wrefresh()*
* you can see all windows being redrawn untouched. *
****************************************************************/
touchwin(stdscr); wnoutrefresh(stdscr);
touchwin(win); wnoutrefresh(win);
touchwin(win1); wnoutrefresh(win1);
touchwin(win2); wnoutrefresh(win2);
doupdate();
/****************************************************************
* At this point, win2 should be "destroyed"; having all other *
* window contents overwritten onto it. The doupdate() should *
* effectively remove it from the screen, leaving the others *
* untouched. On SVR4, this happens, but not with ncurses. *
* I'd suspect something in overwrite() causes this, as nothing *
* appears to be overwritten after the calls, with no errors *
* being reported. This was compiled on my Linux from Slackware*
* 1.1.1, with ncurses1.8.1 recompiled on it, using the console *
* entry from the "new" terminfo from ncurses1.8.1. *
****************************************************************/
getch();
/****************************************************************
* Clean up our act and exit. *
****************************************************************/
endwin();
}
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