py2_menu

# a menu with python2 & py3

import sys,os
import curses

global menuE
global noofmes
menuE   = 1 # active entry
noofmes = 5 # number of menu entries

def draw_menu(stdscr):
    global menuE
    global noofmes
    k = 0
    cursor_x = 0
    cursor_y = 0

    # Clear and refresh the screen for a blank canvas
    stdscr.clear()
    stdscr.refresh()

    # Start colors in curses
    curses.start_color()
    curses.init_pair(1, curses.COLOR_CYAN,  curses.COLOR_BLACK)
    curses.init_pair(2, curses.COLOR_RED,   curses.COLOR_BLACK)
    curses.init_pair(3, curses.COLOR_BLACK, curses.COLOR_WHITE)

    # Loop where k is the last character pressed
    while (k != ord('q')):

        # Initialization
        stdscr.clear()
        height, width = stdscr.getmaxyx()

        if k == curses.KEY_DOWN:
            cursor_y = cursor_y + 1
            menuE = (menuE + 1) % noofmes


        elif k == curses.KEY_UP:
            cursor_y = cursor_y - 1
            menuE = (menuE - 1) % noofmes



        elif k == curses.KEY_RIGHT:
            cursor_x = cursor_x + 1
        elif k == curses.KEY_LEFT:
            cursor_x = cursor_x - 1

        cursor_x = max(0, cursor_x)
        cursor_x = min(width-1, cursor_x)

        cursor_y = max(0, cursor_y)
        cursor_y = min(height-1, cursor_y)

        # Declaration of strings
        title        = "Curses menu demo"[:width-1]
        subtitle     = "greetz out to pythonistas"[:width-1]
        keystr       = "Last key pressed: {}".format(k)[:width-1]
        statusbarstr = "Press 'q' to exit | STATUS BAR | Pos: {}, {}".format(cursor_x, cursor_y)
        if k == 0:
            keystr = "No key press detected..."[:width-1]

        # Centering calculations
        start_x_title    = int(( width // 2) - (len(title)    // 2) - len(title)    % 2)
        start_x_subtitle = int(( width // 2) - (len(subtitle) // 2) - len(subtitle) % 2)
        start_x_keystr   = int(( width // 2) - (len(keystr)   // 2) - len(keystr)   % 2)
        start_y          = int(( height // 2) - 2)

        # Rendering some text
        whstr = "Width: {}, Height: {}".format(width, height)
        stdscr.addstr(0, 0, whstr, curses.color_pair(1))

        # Render status bar
        stdscr.attron(curses.color_pair(3))
        stdscr.addstr(height-1, 0, statusbarstr)
        stdscr.addstr(height-1, len(statusbarstr), " " * (width - len(statusbarstr) - 1))
        stdscr.attroff(curses.color_pair(3))

        # Turning on attributes for title
        stdscr.attron(curses.color_pair(2))
        stdscr.attron(curses.A_BOLD)

        # Rendering title
        stdscr.addstr(start_y, start_x_title, title)


        # Turning off attributes for title
        stdscr.attroff(curses.color_pair(2))
        stdscr.attroff(curses.A_BOLD)

        # Print rest of text
        stdscr.addstr(start_y + 1, start_x_subtitle, subtitle)

        # menu
        stdscr.addstr(start_y + 7,  start_x_subtitle, "~~~  Menu  ~~~")

        if menuE == 1 :  stdscr.attron( curses.A_BOLD)
        else          :  stdscr.attroff(curses.A_BOLD)
        stdscr.addstr(start_y + 8,  start_x_subtitle, "Entry1")
        if menuE == 2 :  stdscr.attron( curses.A_BOLD)
        else          :  stdscr.attroff(curses.A_BOLD)
        stdscr.addstr(start_y + 9,  start_x_subtitle, "Entry2")
        if menuE == 3 :  stdscr.attron( curses.A_BOLD)
        else          :  stdscr.attroff(curses.A_BOLD)
        stdscr.addstr(start_y + 10, start_x_subtitle, "Entry3")
        if menuE == 4 :  stdscr.attron( curses.A_BOLD)
        else          :  stdscr.attroff(curses.A_BOLD)
        stdscr.addstr(start_y + 11, start_x_subtitle, "Entry4")
        if menuE == 5 :  stdscr.attron( curses.A_BOLD)
        else          :  stdscr.attroff(curses.A_BOLD)
        stdscr.addstr(start_y + 12, start_x_subtitle, "Entry5")



        stdscr.addstr(start_y + 3, (width // 2) - 2, '-' * 4)
        stdscr.addstr(start_y + 5, start_x_keystr, keystr)





        stdscr.move(cursor_y, cursor_x)

        # Refresh the screen
        stdscr.refresh()

        # Wait for next input
        k = stdscr.getch()

def main():
    curses.wrapper(draw_menu)

if __name__ == "__main__":
    main()