curses window border example

window_border.py

#!/usr/bin/env python3

import curses
import sys


def create_win(nlines, ncols, begin_y, begin_x):
    win = curses.newwin(nlines, ncols, begin_y, begin_x)
    win.border()
    win.refresh()
    return win


def erase_win(win):
    win.border(' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ')
    win.refresh()


def app(stdscr):
    curses.curs_set(0)
    nlines = 3
    ncols = 10
    begin_y = (curses.LINES - nlines) // 2
    begin_x = (curses.COLS - ncols) // 2
    message = 'Press F1 to exit'
    stdscr.addstr(curses.LINES - 1,
                  (curses.COLS - len(message)) // 2,
                  message)
    stdscr.refresh()
    win = create_win(nlines, ncols, begin_y, begin_x)
    ch = stdscr.getch()
    while ch != curses.KEY_F1:
        if ch == curses.KEY_LEFT:
            begin_x = max(0, begin_x - 1)
        if ch == curses.KEY_RIGHT:
            begin_x = min(curses.COLS - ncols, begin_x + 1)
        if ch == curses.KEY_UP:
            begin_y = max(0, begin_y - 1)
        if ch == curses.KEY_DOWN:
            begin_y = min(curses.LINES - 1 - nlines, begin_y + 1)
        if win.getbegyx() != (begin_y, begin_x):
            erase_win(win)
            win = create_win(nlines, ncols, begin_y, begin_x)
        ch = stdscr.getch()


def main():
    curses.wrapper(app)
    return 0


if __name__ == '__main__':
    sys.exit(main())