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#1 aoeui  Icon User is offline

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curses 2.7

Posted 07 January 2013 - 12:56 PM

AFAIK, there is no curses menu extension available in Python yet so you have to roll your own solution. I know about this patch http://bugs.python.org/issue1723038 but I don't what's the current state of it. I found a nice class for Python that wraps what I want called 'cmenu' here http://www.promisc.org/blog/?p=33 but I have a problem with that too. I want to make a menu where user can choose a highlighted element but instead of executing a particular action right away I want to display another menu, and then maybe another, ask for some input etc. My first thought was to remove the existing cmenu with screen.clear() or cleanup() but the old menu is not removed before the new one is drawn and the new menu looks like this:

    0. top
    1. Exit
    2. Another menu
-- end of the old menu that should go away --
    3. first
    4. second
    5. third



There is no remove() method for removing an item in cmenu(). I guess the fact that the old menu is not cleared is caused by 'while True' loop in display() method but when I removed it some weird stuff was going on. I am using Python 2.7, this is my current code:

#!/usr/bin/python
#
# Adapted from:
# http://blog.skeltonnetworks.com/2010/03/python-curses-custom-menu/
#
# Goncalo Gomes
# http://promisc.org
#

import signal
signal.signal(signal.SIGINT, signal.SIG_IGN)

import os
import sys
import curses
import traceback
import atexit
import time

import sys
reload(sys)
sys.setdefaultencoding("utf-8")

class cmenu(object):
    datum = {}
    ordered = []
    pos = 0

    def __init__(self, options, title="python curses menu"):
        curses.initscr()
        curses.start_color()
        curses.init_pair(1, curses.COLOR_RED, curses.COLOR_WHITE)
        curses.curs_set(0)
        self.screen = curses.initscr()
        self.screen.keypad(1)

        self.h = curses.color_pair(1)
        self.n = curses.A_NORMAL

        for item in options:
            k, v = item.items()[0]
            self.datum[k] = v
            self.ordered.append(k)

        self.title = title

        atexit.register(self.cleanup)

    def cleanup(self):
        curses.doupdate()
        curses.endwin()

    def upKey(self):
        if self.pos == (len(self.ordered) - 1):
            self.pos = 0
        else:
            self.pos += 1

    def downKey(self):
        if self.pos <= 0:
            self.pos = len(self.ordered) - 1
        else:
            self.pos -= 1

    def display(self):
        screen = self.screen

        while True:
            screen.clear()
            screen.addstr(2, 2, self.title, curses.A_STANDOUT|curses.A_BOLD)
            screen.addstr(4, 2, "Please select an interface...", curses.A_BOLD)

            ckey = None
            func = None

            while ckey != ord('\n'):
                for n in range(0, len(self.ordered)):
                    optn = self.ordered[n]

                    if n != self.pos:
                        screen.addstr(5 + n, 4, "%d. %s" % (n, optn), self.n)
                    else:
                        screen.addstr(5 + n, 4, "%d. %s" % (n, optn), self.h)
                screen.refresh()

                ckey = screen.getch()

                if ckey == 258:
                    self.upKey()

                if ckey == 259:
                    self.downKey()

            ckey = 0
            self.cleanup()
            if self.pos >= 0 and self.pos < len(self.ordered):
                self.datum[self.ordered[self.pos]]()
                self.pos = -1
            else:
                curses.flash()



def top():
    os.system("top")

def exit():
    sys.exit(1)

def submenu():
    # c.screen.clear()     # nope
    # c.cleanup()          # nope
    submenu_list = [{"first": exit}, {"second": exit}, {"third": exit}]
    submenu = cmenu(submenu_list)
    submenu.display()

try:

    list = [{ "top": top }, {"Exit": exit}, {"Another menu": submenu}]

    c = cmenu(list)

    c.display()

except SystemExit:
    pass
else:
    #log(traceback.format_exc())
    c.cleanup()



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