pythoncard-users

[Pythoncard-users] Why so slow?

[<kc1...@ya...>]

Hi list,

I have a need to set up a selection list and I am
using a simple statement like:

self.components.cbxMyComboBox.items=items

where items is a list of selection items.

The problem is that when the size of items gets to be
very large (like 10000), it takes *forever* to run. 
However, a non-pythoncard type assign takes no time at
all (like abc_list = items).

I am assuming that Pythoncard needs to actually *copy*
the list whereas the simple assignment is only an
address assignment (alas pointer).

Is there anyway to improve the performance?

Regards,


--
John Henry

Re: [Pythoncard-users] Why so slow?

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

kc1...@ya... wrote:

>Hi list,
>
>I have a need to set up a selection list and I am
>using a simple statement like:
>
>self.components.cbxMyComboBox.items=items
>
>where items is a list of selection items.
>
>The problem is that when the size of items gets to be
>very large (like 10000), it takes *forever* to run. 
>However, a non-pythoncard type assign takes no time at
>all (like abc_list = items).
>
>I am assuming that Pythoncard needs to actually *copy*
>the list whereas the simple assignment is only an
>address assignment (alas pointer).
>
>Is there anyway to improve the performance?
>  
>
I don't think so. As far as I can see, PythonCard simply calls the 
wxPython function AppendItems, which in turn simply calls the wxWidgets 
(i.e. c++) function of the same name - so unless I'm misreading it, 
there's nothing obvious to be done.

Obligatory annoying question : is a UI with 10000 items in a ComboBox 
really usable ?

Only slightly less annoying question : could you use a List instead of a 
ComboBox ?
   (10000 elements in a list takes < 1 sec on my slow laptop)


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



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