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

#include <ncurses.h>


WINDOW *create_newwin(int height, int width, int starty, int startx);
void destroy_win(WINDOW *local_win);

int main(int argc, char *argv[])
{    WINDOW *my_win;
    int startx, starty, width, height;
    int ch;

    initscr();            /* Start curses mode         */
    cbreak();            /* Line buffering disabled, Pass on
                     * everty thing to me         */
    keypad(stdscr, TRUE);        /* I need that nifty F1     */

    height = 3;
    width = 10;
    starty = (LINES - height) / 2;    /* Calculating for a center placement */
    startx = (COLS - width) / 2;    /* of the window        */
    printw("Press F1 to exit");
    refresh();
    my_win = create_newwin(height, width, starty, startx);

    while((ch = getch()) != KEY_F(1))
    {    switch(ch)
        {    case KEY_LEFT:
                destroy_win(my_win);
                my_win = create_newwin(height, width, starty,--startx);
                break;
            case KEY_RIGHT:
                destroy_win(my_win);
                my_win = create_newwin(height, width, starty,++startx);
                break;
            case KEY_UP:
                destroy_win(my_win);
                my_win = create_newwin(height, width, --starty,startx);
                break;
            case KEY_DOWN:
                destroy_win(my_win);
                my_win = create_newwin(height, width, ++starty,startx);
                break;
        }
    }

    endwin();            /* End curses mode          */
    return 0;
}

WINDOW *create_newwin(int height, int width, int starty, int startx)
{    WINDOW *local_win;

    local_win = newwin(height, width, starty, startx);
    box(local_win, 0 , 0);        /* 0, 0 gives default characters
                     * for the vertical and horizontal
                     * lines            */
    wrefresh(local_win);        /* Show that box         */

    return local_win;
}

void destroy_win(WINDOW *local_win)
{
    /* box(local_win, ' ', ' '); : This won't produce the desired
     * result of erasing the window. It will leave it's four corners
     * and so an ugly remnant of window.
     */
    wborder(local_win, ' ', ' ', ' ',' ',' ',' ',' ',' ');
    /* The parameters taken are
     * 1. win: the window on which to operate
     * 2. ls: character to be used for the left side of the window
     * 3. rs: character to be used for the right side of the window
     * 4. ts: character to be used for the top side of the window
     * 5. bs: character to be used for the bottom side of the window
     * 6. tl: character to be used for the top left corner of the window
     * 7. tr: character to be used for the top right corner of the window
     * 8. bl: character to be used for the bottom left corner of the window
     * 9. br: character to be used for the bottom right corner of the window
     */
    wrefresh(local_win);
    delwin(local_win);
}