Re: [Pythoncard-users] Execute menu item while processing

[Alex T. <al...@tw...>]

hwphillips wrote:

>I have written a program which involves a long process of copying 
>files/converting files. I would like for the user to be able to stop the 
>process. I put a "stop" menu item, but the program doesn't respond. The 
>window titlebar goes white and nothing happens till the 
>copying/converting process is over. Any assistance would be appreciated.
>  
>
So long as your processing loop is running, there is no opportunity for 
the wxPython events to be processed and passed to your menu code.

Easiest, simplest, way to handle this is to ensure that your processing 
loop has something like

for file in theListOfFiles:   
     if globalStop: break
     processOneFile()
     wx.SafeYield(self)

This checks a global variable (which you would set to true when the 
"stop" button (or menu) was clicked), then processes one file, then 
yields control (which allows wx to process any events). 

There are a number of examples that do this in the PythonCard sample - 
see for instance gravity.py (or findfiles for "yield" in the samples 
directory).

-- 
Alex Tweedly       http://www.tweedly.net



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