MVC with Python
Georg Altmann
george at george-net.de
Tue Sep 16 06:54:47 EDT 2008
David Boddie schrieb:
> On Monday 15 September 2008 21:37, Georg Altmann wrote:
>
>> I need some advice on how to implement model-view-controller. I am
>> trying to develop a GUI application with PyQt, yet the problem rather
>> applies to mvc in general, not just GUI applications.
>>
>> Let's say the data is a list of objects with a common base class. The
>> views are either a graphical representation of the objects or some form
>> of textual input. The views shall change the model by using command
>> objects (for undo, e.g. QUndoCommand).
>
> [...]
>
>> My problem is, how do the commands interact with the model?
>
> One approach that combines the undo framework with the model/view framework
> is described here:
>
> http://doc.trolltech.com/qq/qq25-undo.html
>
> The implementation is in C++, but it may be possible to pick up some
> useful tips from the article.
Thanks for the pointer. I studied the article before, but it doesn't
seem to work for my problem:
If I understand the Qt model/view architecture correctly, data is always
based on items which are wrapped into QVariant.
(see http://doc.trolltech.com/4.4/qabstractitemmodel.html#data)
So to use the Qt model/view architecture items have to be represented as
a value. I think this leaves me with the problem of copying objects I
described before.
Regards
Georg
More information about the Python-list
mailing list