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devel / comp.lang.python / RE: RE: Problem resizing a window and button placement

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o RE: RE: Problem resizing a window and button placementSteve GS

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RE: RE: Problem resizing a window and button placement

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From: Gronicus@SGA.Ninja (Steve GS)
Newsgroups: comp.lang.python
Subject: RE: RE: Problem resizing a window and button placement
Date: Mon, 26 Feb 2024 06:02:59 -0500
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 by: Steve GS - Mon, 26 Feb 2024 11:02 UTC

Although your code produces the value of Ww outside the function, I do not see how I can use the value of Ww unless I close the program.

import tkinter as tk

Ww = None # What does this do? Why not Integer?
WwZ = None

def on_configure(*args):
global Ww
global WwZ
Ww = root.winfo_width()
print("9 Ww Inside =<"+str(Ww)+">") # works
WwZ = Ww * 2
print("11 WwZ Inside =<"+str(WwZ)+">") # works
return(Ww) #Can I use this?

root = tk.Tk()
root.bind('<Configure>',on_configure)
print("15 Ww Inside1 = <"+str(Ww)+">")
#Ww2 = int(Ww) * 2 # fails
print("17 WwZ Inside2 = <"+str(WwZ)+">")

root.mainloop()

Ww2 = int(Ww) * 2 #Works but only after the program stops
print("21 Ww Outside2 = <"+str(WwZ)+">")
# Can I have concentric loops?

SGA

-----Original Message-----
From: Alan Gauld <learn2program@gmail.com>
Sent: Monday, February 26, 2024 4:04 AM
To: Steve GS <Gronicus@SGA.Ninja>; python-list@python.org
Subject: Re: RE: Problem resizing a window and button placement

On 26/02/2024 07:56, Steve GS via Python-list wrote:

> Then there is that discovery
> element: Why is my original
> idea not working? I still
> cannot pass the value back
> from the function. What is
> different about this function
> that others would have given
> me the value?

There is nothing different, see the code below.
print() is a function like any other.
In this case it is called after you close the window, ie after mainloop() exits.
But any other function called inside
mainloop - eg any other event handler can also access it.

For example, if you added a button:

def printW(): print("Button Ww = ", Ww)

bw = tk.Button(root, text="Print Width", command=printW)
bw.pack()

You would be able to print the value on demand.

>> import tkinter as tk
>>
>> Ww = None
>>
>> def on_configure(*args):
>> global Ww
>> Ww = root.winfo_width()
>> print("Ww Inside =<"+str(Ww)+">")
>>
>> root = tk.Tk()
>> root.bind('<Configure>',on_configure)
>> root.mainloop()
>>
>> print("Ww Outside = <"+str(Ww)+">")

--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos

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