Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!ecngs!feeder2.ecngs.de!newsfeed.freenet.ag!news2.euro.net!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
MIME-Version: 1.0
In-Reply-To: <k1so4h$vlq$1@ger.gmane.org>
References: <mailman.4004.1346408318.4697.python-list@python.org> <k1qhgn$me0$1@dont-email.me> <mailman.4.1346426294.27098.python-list@python.org> <k1qkpa$d1g$1@dont-email.me> <hW40s.4177$905.750@fx27.am4> <624248hoth2ih6bu6jvnvehokbenn0a555@invalid.netcom.com> <CAJ6cK1aM_4Num7V6=hxrLLLs0-VpzXh42v+jWz5x9xcN-3XXPQ@mail.gmail.com> <k1so4h$vlq$1@ger.gmane.org>
Date: Sat, 1 Sep 2012 13:56:32 +0100
Subject: Re: Tkinter bug in Entry widgets on OS X
From: Arnaud Delobelle <arnodel@gmail.com>
To: Peter Otten <__peter__@web.de>
Content-Type: text/plain; charset=UTF-8
Cc: python-list@python.org
Precedence: list
Newsgroups: comp.lang.python
Message-ID: <mailman.33.1346504196.27098.python-list@python.org>
Lines: 49
NNTP-Posting-Host: 2001:888:2000:d::a6
Xref: csiph.com comp.lang.python:28213

On 1 September 2012 11:30, Peter Otten <__peter__@web.de> wrote:
> Arnaud Delobelle wrote:
>> It would be good if I could intercept the key press event and cancel its
>> action on the Entry widget.  It's easy to intercept the key event, but I
>> haven't found out how to prevent the funny characters from being inserted
>> into the Entry widget input area.
>
> Untested as I have no Mac:
>
> import Tkinter as tk
>
> def suppress(event):
>     if event.keycode in {111, 116}:
>         print "ignoring", event.keycode
>         return "break"
>     print event.keycode, "accepted"
>
> root = tk.Tk()
> entry = tk.Entry(root)
> entry.bind("<Key>", suppress)
> entry.pack()
>
> root.mainloop()

This works fine!

return "break" is the piece of knowledge that I was missing. Thanks a
lot!  In fact I lied a bit in my original message - I do use the UP
and DOWN arrows on one Entry widget for navigating its command
history. To do this I was binding the "<Up>" and "<Down>" events to a
function, which simply has to return "break" to work around the bug.
On other Entry widgets, I just bind "<Up>" and "<Down>" to a suppress
function which simply returns "break".

>> I've struggled to find good tkinter
>> docs on the web.
>
> For my (basic) needs I keep coming back to
>
> http://infohost.nmt.edu/tcc/help/pubs/tkinter/

Thanks for the link.  I was using the docs on effbot which are nice
but probably incomplete (and old).

I guess I should flag up this bug but I don't even know if it's a
Python or Tk problem and have little time or expertise to investigate.

-- 
Arnaud