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PyGTK: gtk.combo problem

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    Hi all.. i am trying to create a combo with the pop down list being modfied in real time as i type each character :

    <code>import gtk
    window=gtk.Window(gtk.WINDOW_TOPLEVEL)
    window.connect("destroy",gtk.main_quit)
    combo=gtk.Combo()
    combo.set_use_arrows(True)

    wordlist=['aata','abbay','acute','adistance','bobbby','cat','cbount','daddy']
    def entry_callback(widget,combo):
    # ------

    combo.entry.connect("activate",entry_callback,combo)
    window.add(combo)
    window.show()
    combo.show()
    gtk.main()
    </code>

    now my aim is when i enter a chareacter 'a' into the combo.entry field .. all the words beginning with the letter 'a' wud be set in the popdown list .. if the next character is 'c' , meaning now the entry is 'ac' then the pop down list should be modified to only the word 'acute' .. now the problem is the combo.entry.get_text() function will return a string only when the enter key is pressed .. how do i set the pop down list without pressing the enter key ? :( assuming i already haev a function which is a python version of the C function getch() . returning the character which is pressed on the keyboard .. here is the fucntion:



    <code>
    def getch():
    import os, tty

    fd = sys.stdin.fileno()
    tty_mode = tty.tcgetattr(fd)
    tty.setcbreak(fd)
    try:
    ch = os.read(fd, 1)
    finally:
    tty.tcsetattr(fd, tty.TCSAFLUSH, tty_mode)

    return ch

    </code>
    but this wud catch a chaarcter entered in the console .. how do i do the same for the entry box of the combo.. any help appreciated.
    regards
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