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Author jaytmiller
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Date 2006-08-11.18:20:52
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The following code works ok for Tk-8.3 and earlier but
locks up for Tk-8.4:

import Tkinter
 
tk = Tkinter.Tk()
tk.withdraw()
 
import tkSimpleDialog 
tkSimpleDialog.askstring("window title", "question?")
 

I Googled and found the explanation and fix from Jeff
Epler below.  In a nutshell,  since the root window is
withdrawn,  the dialog window "inherits" that property
and is not shown either,  making it appear that the
system has locked up when it is actually waiting for
input from an invisible dialog.


http://mail.python.org/pipermail/python-list/2005-April/275761.html
 
Tkinter "withdraw" and "askstring" problem
Jeff Epler jepler at unpythonic.net
Tue Apr 12 15:58:22 CEST 2005
 
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The answer has to do with a concept Tk calls "transient".
    wm transient window ?master?
        If master is specified, then the window manager
is informed that
        window  is  a  transient window (e.g. pull-down
menu) working on
        behalf of master (where master is the path name
for a  top-level
        window).   If master is specified as an empty
string then window
        is marked as not being a transient window any 
more.   Otherwise
        the command returns the path name of s current
master, or
        an empty string if window t currently a
transient window.  A
        transient  window  will  mirror  state changes
in the master and
        inherit the state of the master when initially
mapped. It is  an
        error to attempt to make a window a transient
of itself.
 
In tkSimpleDialog, the dialog window is unconditionally
made transient
for the master.  Windows is simply following the
documentation: The
askstring window "inherit[s] the state of the master
[i.e., withdrawn]
when initially mapped".
 
The fix is to modify tkSimpleDialog.Dialog.__init__ to
only make the
dialog transient for its master when the master is
viewable.  This
mirrors what is done in dialog.tcl in Tk itself.  You
can either change
tkSimpleDialog.py, or you can include a new definition
of __init__ with
these lines at the top, and the rest of the function
the same:
 
    def __init__(self, parent, title = None):
        ''' the docstring ... '''
        Toplevel.__init__(self, parent)
        if parent.winfo_viewable():
            self.transient(parent)
        ...
 
    # Thanks for being so dynamic, Python!
    tkSimpleDialog.Dialog.__init__ = __init__; del __init__
 
Jeff
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Date User Action Args
2007-08-23 15:54:04adminlinkissue1538878 messages
2007-08-23 15:54:04admincreate