single button threading

On Sun, Jun 17, 2007 at 09:41:25PM +0100, Brill IanT wrote:
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> 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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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.
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On Sun, 17 Jun 2007 21:41:25 +0100 (BST)
Brill IanT <woswwfyahoo.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

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