From fbonniwell at ca.rr.com  Fri Jun  1 18:48:16 2007
From: fbonniwell at ca.rr.com (fbonniwell)
Date: Fri, 1 Jun 2007 09:48:16 -0700 (PDT)
Subject: [Tkinter-discuss] Executing Tkinter UI from another class
Message-ID: <10916531.post@talk.nabble.com>


Hello,

I'm still learning how to call class methods from other classes. I'm trying
to figure out what is the best approach to executing a Tkinter UI from
another class. It tells me that it expects two aurguments but received only
1. I expect it may have something to do with "app = App(root)" from
class1.py. 
I also tried defining another procedure that would execute both but I'm
still confused. 
Thanks for the help!

Frank


For example: 

Class1.py
-----------------------------------------------
import Tkinter


class App(Frame):
    def __init__(self , master):
        Frame.__init__(self, master)

    def makeFrames(self):
         code
    def makeRest(self):
         code
    def gerChars(self):
         code

    def createUI(self):
        #creates the UI
        self.makeFrames()
        self.makeRest()
        self.gerChars()

root = Tk()
app = App(root)
app.pack()
app.createUI()
root.mainloop()

-------------------------------------------------------
Class2.py calling class1.py to execute UI


import class1

class ImportChar:
    def __init__(self):
        app = App(root)

    def AppendChar(self):
         code

    def RunItAll(self):
         self.ApppendChar()
         self.app.createUI()

importchar = ImportChar()
importchar.RunItAll()


-------------------------------------------------
         
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From sipickles at hotmail.com  Wed Jun  6 18:18:31 2007
From: sipickles at hotmail.com (Simon Pickles)
Date: Wed, 06 Jun 2007 17:18:31 +0100
Subject: [Tkinter-discuss] Newbie needs help with entrybox
Message-ID: <BAY114-F10B4275CC861642978AF72BE270@phx.gbl>

Hello, I am new to python and tkinter, but enjoying it so far.

In trying to make a simple GUI I have stumbled on a problem binding an event 
to a function. I've got a listbox for output and an entrybox for input. How 
do I act on the text in the entry box when return is pressed?

Here's my attempt:

# GUI

from Tkinter import*
import tkMessageBox
from time import ctime, time

class CGUI:
    def __init__(self, master):
        frame = Frame(master, name="server")
        frame.pack()
        self.output = Listbox(frame, width=100, height=30)
        self.output.grid(row=0, column=0)
        self.inputBox = Entry(root, bd=5, width=100)
        self.inputBox.bind( "<KeyPress-Return>", 
self.__ParseInput(self.inputBox.get()) )
        self.inputBox.pack(side=BOTTOM, expand=YES, fill=BOTH)

    def __ParseInput(self, s):
        self.output.insert(END, s)


root = Tk()

gui = CGUI(root)


-------------------------------------------------------------------------


Your advice appreciated!

Thanks

Simon
http://www.simonpickles.com  --- http://www.squirtualreality.com

_________________________________________________________________
The next generation of Hotmail is here! http://www.newhotmail.co.uk/


From tms43 at clearwire.net  Wed Jun  6 18:36:32 2007
From: tms43 at clearwire.net (Teresa Stanton)
Date: Wed, 6 Jun 2007 09:36:32 -0700
Subject: [Tkinter-discuss] Newbie needs help with entrybox
In-Reply-To: <BAY114-F10B4275CC861642978AF72BE270@phx.gbl>
References: <BAY114-F10B4275CC861642978AF72BE270@phx.gbl>
Message-ID: <000901c7a858$d8d3dc20$8a7b9460$@net>

I'm quite a noob to this also, but I can say that two things are missing:  A
function that your return event would call telling Python what to do when
the event occurs, and mainloop.  

For instance, here is a sample code that when you click on it, will tell you
where the mouse click event occurred:

# File: bind1.py

from Tkinter import *

root = Tk()

def callback(event):     #this will be called later, the definition of the
event.
    print "clicked at", event.x, event.y

frame = Frame(root, width=100, height=100)
frame.bind("<Button-1>", callback)  #callback is the function, previously
defined.
frame.pack()

root.mainloop()


HTH

Teresa

-----Original Message-----
From: tkinter-discuss-bounces at python.org
[mailto:tkinter-discuss-bounces at python.org] On Behalf Of Simon Pickles
Sent: Wednesday, June 06, 2007 9:19 AM
To: tkinter-discuss at python.org
Subject: [Tkinter-discuss] Newbie needs help with entrybox

Hello, I am new to python and tkinter, but enjoying it so far.

In trying to make a simple GUI I have stumbled on a problem binding an event

to a function. I've got a listbox for output and an entrybox for input. How 
do I act on the text in the entry box when return is pressed?

Here's my attempt:

# GUI

from Tkinter import*
import tkMessageBox
from time import ctime, time

class CGUI:
    def __init__(self, master):
        frame = Frame(master, name="server")
        frame.pack()
        self.output = Listbox(frame, width=100, height=30)
        self.output.grid(row=0, column=0)
        self.inputBox = Entry(root, bd=5, width=100)
        self.inputBox.bind( "<KeyPress-Return>", 
self.__ParseInput(self.inputBox.get()) )
        self.inputBox.pack(side=BOTTOM, expand=YES, fill=BOTH)

    def __ParseInput(self, s):
        self.output.insert(END, s)


root = Tk()

gui = CGUI(root)


-------------------------------------------------------------------------


Your advice appreciated!

Thanks

Simon
http://www.simonpickles.com  --- http://www.squirtualreality.com

_________________________________________________________________
The next generation of Hotmail is here! http://www.newhotmail.co.uk/

_______________________________________________
Tkinter-discuss mailing list
Tkinter-discuss at python.org
http://mail.python.org/mailman/listinfo/tkinter-discuss




From gigs at hi.t-com.hr  Wed Jun  6 20:22:36 2007
From: gigs at hi.t-com.hr (Gigs_)
Date: Wed, 06 Jun 2007 20:22:36 +0200
Subject: [Tkinter-discuss] Newbie needs help with entrybox
In-Reply-To: <BAY114-F10B4275CC861642978AF72BE270@phx.gbl>
References: <BAY114-F10B4275CC861642978AF72BE270@phx.gbl>
Message-ID: <4666FB6C.7030606@hi.t-com.hr>

Simon Pickles wrote:
> Hello, I am new to python and tkinter, but enjoying it so far.
>
> In trying to make a simple GUI I have stumbled on a problem binding an event 
> to a function. I've got a listbox for output and an entrybox for input. How 
> do I act on the text in the entry box when return is pressed?
>
> Here's my attempt:
>
> # GUI
>
> from Tkinter import*
> import tkMessageBox
> from time import ctime, time
>
> class CGUI:
>     def __init__(self, master):
>         frame = Frame(master, name="server")
>         frame.pack()
>         self.output = Listbox(frame, width=100, height=30)
>         self.output.grid(row=0, column=0)
>         self.inputBox = Entry(root, bd=5, width=100)
>         self.inputBox.bind( "<KeyPress-Return>", 
> self.__ParseInput(self.inputBox.get()) )
>         self.inputBox.pack(side=BOTTOM, expand=YES, fill=BOTH)
>
>     def __ParseInput(self, s):
>         self.output.insert(END, s)
>
>
> root = Tk()
>
> gui = CGUI(root)
>
>
> -------------------------------------------------------------------------
>
>
> Your advice appreciated!
>
> Thanks
>
> Simon
> http://www.simonpickles.com  --- http://www.squirtualreality.com
>
> _________________________________________________________________
> The next generation of Hotmail is here! http://www.newhotmail.co.uk/
>
> _______________________________________________
> Tkinter-discuss mailing list
> Tkinter-discuss at python.org
> http://mail.python.org/mailman/listinfo/tkinter-discuss
>
> __________ NOD32 2313 (20070606) Information __________
>
> This message was checked by NOD32 antivirus system.
> http://www.eset.com
>
>
>
>   
from Tkinter import *
import tkMessageBox
from time import ctime, time

class CGUI(Frame):
    def __init__(self, master=None):
        Frame.__init__(self, master)
        self.pack()
        self.output = Listbox(self, width=100, height=30)
        self.output.pack()
        self.inputBox = Entry(self, bd=5, width=100)
        self.inputBox.pack(side=BOTTOM, expand=YES, fill=BOTH)
        self.inputBox.bind("<Return>", lambda event: 
self.parseInput(self.inputBox.get()))

    def parseInput(self, s):
        self.output.insert(END, s)
        self.inputBox.delete(0, END)

CGUI().mainloop()


here it is
dont use grid and pack in same parent. it will not work.

i explain more but my english is bad and dont know how to express myself

From jmcmonagle at velseis.com.au  Thu Jun  7 00:58:46 2007
From: jmcmonagle at velseis.com.au (John McMonagle)
Date: Thu, 07 Jun 2007 08:58:46 +1000
Subject: [Tkinter-discuss] Newbie needs help with entrybox
In-Reply-To: <4666FB6C.7030606@hi.t-com.hr>
References: <BAY114-F10B4275CC861642978AF72BE270@phx.gbl>
	<4666FB6C.7030606@hi.t-com.hr>
Message-ID: <46673C26.7000706@velseis.com.au>

Gigs_ wrote:
> Simon Pickles wrote:
>> Hello, I am new to python and tkinter, but enjoying it so far.
>>
>> In trying to make a simple GUI I have stumbled on a problem binding an event 
>> to a function. I've got a listbox for output and an entrybox for input. How 
>> do I act on the text in the entry box when return is pressed?
>>
>> Here's my attempt:
>>
>> # GUI
>>
>> from Tkinter import*
>> import tkMessageBox
>> from time import ctime, time
>>
>> class CGUI:
>>     def __init__(self, master):
>>         frame = Frame(master, name="server")
>>         frame.pack()
>>         self.output = Listbox(frame, width=100, height=30)
>>         self.output.grid(row=0, column=0)
>>         self.inputBox = Entry(root, bd=5, width=100)
>>         self.inputBox.bind( "<KeyPress-Return>", 
>> self.__ParseInput(self.inputBox.get()) )
>>         self.inputBox.pack(side=BOTTOM, expand=YES, fill=BOTH)
>>
>>     def __ParseInput(self, s):
>>         self.output.insert(END, s)
>>
>>
>> root = Tk()
>>
>> gui = CGUI(root)
>>
>>
>> -------------------------------------------------------------------------
>>
>>

You are not far away from success.

Problem 1:  you need to call mainloop after you instanciate the class.

Problem 2:  when you bind your __ParseInput function to the 
KeyPress-Return event, you are really binding the return result rather 
than the function name

Problem 3:  the event object gets passed to your function so you need to 
supply it as an argument

Problem 4:  passing self.inputBox.get() as an argument to the 
__ParseInput function will only pass the value of the Entry widget at 
the time the binding is made, not when you trigger the event.  So you 
need to call it from within the function itself.

See below for amendments to your code:

from Tkinter import*
import tkMessageBox
from time import ctime, time

class CGUI:
     def __init__(self, master):
         frame = Frame(master, name="server")
         frame.pack()
         self.output = Listbox(frame, width=100, height=30)
         self.output.grid(row=0, column=0)
         self.inputBox = Entry(root, bd=5, width=100)
         self.inputBox.bind( "<KeyPress-Return>", self.__ParseInput)
         self.inputBox.pack(side=BOTTOM, expand=YES, fill=BOTH)

     def __ParseInput(self, event):
         self.output.insert(END, self.inputBox.get())


root = Tk()

if __name__ == '__main__':
     gui = CGUI(root)
     root.mainloop()


> 
> 
> dont use grid and pack in same parent. it will not work.
> 


Although gigs is right in saying that you cannot mix grid and pack in 
the same parent, in your case you have not.  Your container hierarchy:

root is the toplevel
frame and inputBox are packed into root
output is gridded into frame.

So there is no contention here.


Also, do not be tempted to adopt his style of inheriting Frame - your 
original approach is better.  Frame is a container widget NOT a window.


Regards,

John

From pollastri at iriti.cnr.it  Fri Jun  8 11:59:54 2007
From: pollastri at iriti.cnr.it (Fabrizio Pollastri)
Date: Fri, 08 Jun 2007 11:59:54 +0200
Subject: [Tkinter-discuss] visualtcl as ui designer for tkinter
Message-ID: <4669289A.50004@iriti.cnr.it>

Hello,
I am trying to use VisualTcl as an interface designer. The tcl file 
produced by VisualTcl is executed in my application as

root = Tk()
root.tk.evalfile('my_tcl_gui.tcl')

I have found two problems.

First, the toplevel "root" supersede the toplevel options defined in the 
tcl file (typically the window title).

Second, the tcl file evaluation stops for "argc" undefined.

Similar tcl files created with TkproE do not suffer this problems.

Thank for any help.


Regards,
F. Pollastri

From january at uni-muenster.de  Fri Jun 15 02:43:19 2007
From: january at uni-muenster.de (January Weiner)
Date: Fri, 15 Jun 2007 02:43:19 +0200
Subject: [Tkinter-discuss] Ugly fonts with tkinter
Message-ID: <454237550706141743s386e6c69x2a717290c8edd3c7@mail.gmail.com>

I am sure this has been asked a hundred times, but I could not find an
answer in Google.

I have recently started programming using Tkinter and python.  Before,
I was heavily using Perl-Tk, so I have some experience with that kit.
My system is Ubuntu 7.04.

My problem are the extremly ugly bitmap fonts used by Tkinter. Here is
an example:
http://hell.pl/january/python_fonts_example.png

I remember having a similar problem in perl-tk, and having for that
two solutions:
1) choose a different font (optionAdd method of the main window with
e.g. Arial 10)
2) recompiling perl-tk with an antialias option set, so that one gets
fully anti-aliased fonts.

First, I would like to use option (1), but I don't know enough of
tkinter to find it. Furthermore, I would like to know what is the
status on (2).  Is tkinter using somehow its own tk libraries, or does
it relies on system wide libraries? Do you have any experience with
using antialiased fonts with tkinter?

Cheers,
j.
-- 
------------ January Weiner 3  ---------------------+---------------
Division of Bioinformatics, University of Muenster  |  Schlo?platz 4
(+49)(251)8321634                                   |  D48149 M?nster
http://www.uni-muenster.de/Evolution/ebb/           |  Germany

From fredrik at pythonware.com  Fri Jun 15 08:31:49 2007
From: fredrik at pythonware.com (Fredrik Lundh)
Date: Fri, 15 Jun 2007 08:31:49 +0200
Subject: [Tkinter-discuss] Ugly fonts with tkinter
In-Reply-To: <454237550706141743s386e6c69x2a717290c8edd3c7@mail.gmail.com>
References: <454237550706141743s386e6c69x2a717290c8edd3c7@mail.gmail.com>
Message-ID: <f4tbol$jvk$1@sea.gmane.org>

January Weiner wrote:

> 1) choose a different font (optionAdd method of the main window with
> e.g. Arial 10)
> 
> First, I would like to use option (1), but I don't know enough of
> tkinter to find it.

use the option_add() method on the root widget.  e.g.

    root.option_add("*Label*font", "Helvetica 15 bold")

</F>


From woswwf at yahoo.co.uk  Sun Jun 17 22:41:25 2007
From: woswwf at yahoo.co.uk (Brill IanT)
Date: Sun, 17 Jun 2007 21:41:25 +0100 (BST)
Subject: [Tkinter-discuss] single button threading
Message-ID: <146481.5193.qm@web26604.mail.ukl.yahoo.com>

I am writing an application which fetches and parses a large number of urls for hyperlinks.
   
  My problem is that when the prog is in the middle of the 'fetching' stage, the gui becomes almost completely unresponsive.
   
  This is not at all what I want. I want the user to be able to interact with the gui while this process is going on. Even if just one button, a 'stop' button, is the only thing working, I would be satisfied with that. 
   
  Is there a way to perhaps thread a button or two while urllib2 is busy fetching a big list of urls? I ask this with some trepidation because I know how thread unfriendly tkinter is.
   
  If there is no solution to this, can anyone tell me if reconstructing the gui with wx would help with this matter? I don't want to do this because I am familiar with tk and find it far easier to work with, but I really have to find a way of solving this problem.
   
  Thank you very much for reading, and I hope someone can help me out.

       
---------------------------------
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From Cameron at phaseit.net  Sun Jun 17 22:55:50 2007
From: Cameron at phaseit.net (Cameron Laird)
Date: Sun, 17 Jun 2007 20:55:50 +0000
Subject: [Tkinter-discuss] single button threading
In-Reply-To: <146481.5193.qm@web26604.mail.ukl.yahoo.com>
References: <146481.5193.qm@web26604.mail.ukl.yahoo.com>
Message-ID: <20070617205550.GA23108@lairds.us>

On Sun, Jun 17, 2007 at 09:41:25PM +0100, Brill IanT wrote:
			.
			.
			.
> I am writing an application which fetches and parses a large number of urls for hyperlinks.
>    
>   My problem is that when the prog is in the middle of the 'fetching' stage, the gui becomes almost completely unresponsive.
>    
>   This is not at all what I want. I want the user to be able to interact with the gui while this process is going on. Even if just one button, a 'stop' button, is the only thing working, I would be satisfied with that. 
>    
>   Is there a way to perhaps thread a button or two while urllib2 is busy fetching a big list of urls? I ask this with some trepidation because I know how thread unfriendly tkinter is.
>    
>   If there is no solution to this, can anyone tell me if reconstructing the gui with wx would help with this matter? I don't want to do this because I am familiar with tk and find it far easier to work with, but I really have to find a way of solving this problem.
>    
>   Thank you very much for reading, and I hope someone can help me out.
			.
			.
			.
There are several ways to achieve the responsiveness you describe
within Tkinter.  I'll be tied up the next couple of days; I hope
an answer that delayed still helps you.

From klappnase at web.de  Mon Jun 18 10:50:13 2007
From: klappnase at web.de (Michael Lange)
Date: Mon, 18 Jun 2007 10:50:13 +0200
Subject: [Tkinter-discuss] single button threading
In-Reply-To: <146481.5193.qm@web26604.mail.ukl.yahoo.com>
References: <146481.5193.qm@web26604.mail.ukl.yahoo.com>
Message-ID: <20070618105013.729068d1.klappnase@web.de>

On Sun, 17 Jun 2007 21:41:25 +0100 (BST)
Brill IanT <woswwf at yahoo.co.uk> wrote:

> I am writing an application which fetches and parses a large number of urls for hyperlinks.
>    
>   My problem is that when the prog is in the middle of the 'fetching' stage, the gui becomes almost completely unresponsive.
>    
>   This is not at all what I want. I want the user to be able to interact with the gui while this process is going on. Even if just one button, a 'stop' button, is the only thing working, I would be satisfied with that. 
>    
>   Is there a way to perhaps thread a button or two while urllib2 is busy fetching a big list of urls? I ask this with some trepidation because I know how thread unfriendly tkinter is.
>    

I did not find it that hard to use Tkinter with threads. You just have to make sure that
all interaction with Tk is done from the main (gui) thread. Typically I use a bunch
of variables to handle communication between Tkinter and the child thread, so the 
"Stop" button would set a "stop_child_thread" flag to True, whereas the child
thread continually updates a "progress" flag that allows the gui to draw some visual feedback
about the progress made by the child.

I hope this helps

Michael


From Cameron at phaseit.net  Tue Jun 19 21:27:51 2007
From: Cameron at phaseit.net (Cameron Laird)
Date: Tue, 19 Jun 2007 19:27:51 +0000
Subject: [Tkinter-discuss] single button threading
In-Reply-To: <20070618105013.729068d1.klappnase@web.de>
References: <146481.5193.qm@web26604.mail.ukl.yahoo.com>
	<20070618105013.729068d1.klappnase@web.de>
Message-ID: <20070619192751.GA4600@lairds.us>

On Mon, Jun 18, 2007 at 10:50:13AM +0200, Michael Lange wrote:
			.
			.
			.
> Brill IanT <woswwf at yahoo.co.uk> wrote:
> 
> > I am writing an application which fetches and parses a large number of urls for hyperlinks.
> >    
> >   My problem is that when the prog is in the middle of the 'fetching' stage, the gui becomes almost completely unresponsive.
> >    
> >   This is not at all what I want. I want the user to be able to interact with the gui while this process is going on. Even if just one button, a 'stop' button, is the only thing working, I would be satisfied with that. 
> >    
> >   Is there a way to perhaps thread a button or two while urllib2 is busy fetching a big list of urls? I ask this with some trepidation because I know how thread unfriendly tkinter is.
> >    
> 
> I did not find it that hard to use Tkinter with threads. You just have to make sure that
> all interaction with Tk is done from the main (gui) thread. Typically I use a bunch
> of variables to handle communication between Tkinter and the child thread, so the 
> "Stop" button would set a "stop_child_thread" flag to True, whereas the child
> thread continually updates a "progress" flag that allows the gui to draw some visual feedback
> about the progress made by the child.
> 
> I hope this helps
			.
			.
			.
There certainly are people who regard Tkinter threading as touchy.
I choose not to argue that point today.

I *will* point out that, in essentially all common systems (not 
just Tkinter, and not just any particular operating system), you'll
need to confine your GUI work to a single thread.

Let's sidestep all that for right now, and look at an example of a
responsive urllib2-using GUI in a single thread:
  from Tkinter import *
  from urllib2 import *
  
  master = Tk()
  
  def fetch_action():
      l.configure(text = "Beginning download")
      l.after(0, download)
  
  def download():
      global total_read
      global stop_reading
  
      URL = "http://wiki.python.org/moin/RecentChanges"
      f = urlopen(URL)
      total_read = 0
      stop_reading = 0
      l.after(0, read_more, f, 100)
  
  def read_more(handle, octets):
      global total_read
      global stop_reading
  
      if stop_reading:
          return
      print handle.read(octets),
      total_read += octets
      l.configure(text = "%d octets read" % total_read)
      l.after(1, read_more, handle, octets)
  
  def stop():
      global stop_reading
  
      stop_reading = 1
  
  l = Label(master, text = 40 * " ")
  b1 = Button(master, text = "Fetch", command = fetch_action)
  b2 = Button(master, text = "Stop reading", command = stop)
  l.pack()
  b1.pack()
  b2.pack()
  
  mainloop()
I like to think this speaks for itself.  If you execute this application
for itself, you'll see a GUI that remains responsive even while urllib2
operations are proceeding.

From pollastri at iriti.cnr.it  Mon Jun 25 11:17:59 2007
From: pollastri at iriti.cnr.it (Fabrizio Pollastri)
Date: Mon, 25 Jun 2007 11:17:59 +0200
Subject: [Tkinter-discuss] different results from the same tcl script
Message-ID: <467F8847.5040709@iriti.cnr.it>

Hello,
in mixed python-tcl programming I found the following different 
behaviours of the same tcl script.

If I type manually in the python interpreter the following lines

 >>> from Tkinter import *
 >>> w = Tk()
 >>> w.tk.evalfile('my_tcl_script.tcl')

where my_tcl_script.tcl is

    #!/bin/sh
    package require Tk
    wm withdraw .
    toplevel .root
    wm title .root "My title"

I obtain one toplevel window with title "My title", as expected.


The same result is obtained with the tcl shell command

% wish my_tcl_script.tcl


Now, I wish to run the same instructions from a python script. So, I 
written the following script

    from time import *
    from Tkinter import *
    w = Tk()
    w.tk.evalfile('my_tcl_script.tcl')
    sleep(3)

The result of this python script is nothing, no window appears.

If anybody can explain the different behaviour and how to normalize it 
with the correct one, I will be very glad. Thank you in advance.


F. Pollastri

From pollastri at iriti.cnr.it  Mon Jun 25 16:41:11 2007
From: pollastri at iriti.cnr.it (Fabrizio Pollastri)
Date: Mon, 25 Jun 2007 16:41:11 +0200
Subject: [Tkinter-discuss] different results from the same tcl script
Message-ID: <467FD407.9090803@iriti.cnr.it>

Mohammad Tayseer wrote:
 > Finishing the program will close it, which will destroy the Tk object.
 > You have to call mainloop() at the end to stop the program from >closing

The program waits for 3 seconds before finishing, so I must see the 
expected window for the same time, but this do not happen.


F. Pollastri

From m_tayseer82 at yahoo.com  Mon Jun 25 19:20:44 2007
From: m_tayseer82 at yahoo.com (Mohammad Tayseer)
Date: Mon, 25 Jun 2007 10:20:44 -0700 (PDT)
Subject: [Tkinter-discuss] different results from the same tcl script
In-Reply-To: <467FD407.9090803@iriti.cnr.it>
Message-ID: <352029.24348.qm@web31111.mail.mud.yahoo.com>

You have to call mainloop for any window to appear. I cannot remember the exact reason for this, but it was posted before on the mailing list

Fabrizio Pollastri <pollastri at iriti.cnr.it> wrote: Mohammad Tayseer wrote:
 > Finishing the program will close it, which will destroy the Tk object.
 > You have to call mainloop() at the end to stop the program from >closing

The program waits for 3 seconds before finishing, so I must see the 
expected window for the same time, but this do not happen.


F. Pollastri
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From agent_barnes at yahoo.com  Wed Jun 27 20:48:04 2007
From: agent_barnes at yahoo.com (Barnesdesdes)
Date: Wed, 27 Jun 2007 11:48:04 -0700 (PDT)
Subject: [Tkinter-discuss] Possibly n00bish question about ImageTk
Message-ID: <11330353.post@talk.nabble.com>


I've been trying to make a program which will import a png file and display
it inside a frame.  It actually works when I just run the code, but if I try
to abstract the exact same code into a function, it fails.  In the code
below, if I just run it, it works.  However, if I comment out the lines
between "root=Tkinter.Tk()" and "moo(root)" and comment in "moo(root)", it
no longer works.  Instead of displaying the image, it just displays a gray
frame of the correct size.  Does anyone have any insights about what I'm
doing wrong?

import Image, ImageTk, Tkinter

def moo(master):
    img = Image.open('plotfig.png')
    f = Tkinter.Frame(master, width=800, height=600)
    pi = ImageTk.PhotoImage(img)
    t = Tkinter.Label(f, image=pi)
    f.pack()
    t.place(x=0, y=0, width=800, height=600)
    t.pack()

root = Tkinter.Tk()
img = Image.open('plotfig.png')
f = Tkinter.Frame(root, width=800, height=600)
pi = ImageTk.PhotoImage(img)
t = Tkinter.Label(f, image=pi)
f.pack()
t.place(x=0, y=0, width=800, height=600)
t.pack()
#moo(root)
root.mainloop()


Thanks very much.

Alan

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From mkieverpy at tlink.de  Thu Jun 28 11:29:11 2007
From: mkieverpy at tlink.de (mkieverpy at tlink.de)
Date: Thu, 28 Jun 2007 09:29:11 -0000
Subject: [Tkinter-discuss] Possibly n00bish question about ImageTk
Message-ID: <20070628072843.AF085BB03@mail.terralink.de>


Hi Alan,

in your function 'moo' 'pi' is a local variable which
gets garbage collected when the function returns.
Thus your image goes to gc nirvana.
Making 'pi' global like this

def moo(master):
    global pi
    img = Image.open('plotfig.png')
    f = Tkinter.Frame(master, width=800, height=600)
    pi = ImageTk.PhotoImage(img)
    t = Tkinter.Label(f, image=pi)
    f.pack()
    t.place(x=0, y=0, width=800, height=600)
    t.pack()

should do the trick.
This is a guess as I am not using Image and ImageTk.
But I had the same problem with Tix.PhotoImage. So I guess this is it.

BTW you use 'place' and 'pack' for the label. As I understood
your supposed to use exactly ONE geometry handler for a gui element in tk.

Hope this helps,

Matthias Kievernagel
(mkiever/at/web/dot/de)

From jmcmonagle at velseis.com.au  Fri Jun 29 00:21:02 2007
From: jmcmonagle at velseis.com.au (John McMonagle)
Date: Fri, 29 Jun 2007 08:21:02 +1000
Subject: [Tkinter-discuss] Possibly n00bish question about ImageTk
In-Reply-To: <20070628072843.AF085BB03@mail.terralink.de>
References: <20070628072843.AF085BB03@mail.terralink.de>
Message-ID: <4684344E.4060901@velseis.com.au>

mkieverpy at tlink.de wrote:

> BTW you use 'place' and 'pack' for the label. As I understood
> your supposed to use exactly ONE geometry handler for a gui element in tk.
> 

This really only applies to widgets which are packed/placed/gridded into 
the same parent container.    In his example he is packing a Frame into 
master then placing a Label into the Frame, so there is no contention.