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