Re: Tkinter bug in Entry widgets on OS X

From	Peter Otten <__peter__@web.de>
Subject	Re: Tkinter bug in Entry widgets on OS X
Date	2012-09-01 12:30 +0200
Organization	None
References	(2 earlier) <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>
Newsgroups	comp.lang.python
Message-ID	<mailman.30.1346495467.27098.python-list@python.org> (permalink)

Show all headers | View raw

Arnaud Delobelle wrote:

> On Friday, 31 August 2012, Dennis Lee Bieber wrote:
> 
>> On Fri, 31 Aug 2012 15:41:01 GMT, Alister
>> <alister.ware@ntlworld.com<javascript:;>
>> >
>> declaimed the following in gmane.comp.python.general:
>>
>> > I agree that it is unexpected in a single line entry box but isn't the
>> 1st
>> > rule of user interface design to assume the user is a moron & will do
>> > things they are not supposed to do?
>> >
>> > Therefore invalid inputs should be handled gracefully (not just insert
>> > random characters) which is what I think the original poster is
>> > suggesting.
>>
>>         To which I'd suggest the programmer (vs the user), probably needs
>> to
>> code some sort of per-character validation check... After all, there may
>> be situations where accepting pretty much any key-code is desired, and
>> if the widget filters characters before they get to the programmer level
>> that becomes impossible.
>>
>>
> 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()

> 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/

Thread

Tkinter bug in Entry widgets on OS X Arnaud Delobelle <arnodel@gmail.com> - 2012-08-31 11:18 +0100
  Re: Tkinter bug in Entry widgets on OS X Kevin Walzer <kw@codebykevin.com> - 2012-08-31 10:25 -0400
    Re: Tkinter bug in Entry widgets on OS X Arnaud Delobelle <arnodel@gmail.com> - 2012-08-31 16:18 +0100
      Re: Tkinter bug in Entry widgets on OS X Kevin Walzer <kw@codebykevin.com> - 2012-08-31 11:21 -0400
        Re: Tkinter bug in Entry widgets on OS X Alister <alister.ware@ntlworld.com> - 2012-08-31 15:41 +0000
          Re: Tkinter bug in Entry widgets on OS X Arnaud Delobelle <arnodel@gmail.com> - 2012-08-31 20:05 +0100
          Re: Tkinter bug in Entry widgets on OS X Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-31 15:30 -0400
          Re: Tkinter bug in Entry widgets on OS X Peter Otten <__peter__@web.de> - 2012-09-01 12:30 +0200
          Re: Tkinter bug in Entry widgets on OS X Arnaud Delobelle <arnodel@gmail.com> - 2012-09-01 13:56 +0100
    Re: Tkinter bug in Entry widgets on OS X "Russell E. Owen" <rowen@uw.edu> - 2012-09-13 13:33 -0700

csiph-web