Animated labels and progress bars in Oxygen considered harmful?

Aurélien Gâteau agateau at
Wed Dec 2 16:27:05 GMT 2009

Hugo Pereira Da Costa wrote:
> On 12/02/2009 06:48 AM, Stefan Majewsky wrote:
>> Am Mittwoch, 2. Dezember 2009 09:43:57 schrieb Aurélien Gâteau:
>>> The widget is not changed behind
>>> the developer back.
>> I think the important point is not that this was changed behind the
>> developer's back,
> In fact thinking about it: isn't the whole idea of QStyle/KStyle to 
> change widgets behind the developer's back ? When we (Nuno or I) change 
> the tab shape, or the main window background gradients, or the checkmark 
> in radio buttons, we do all that behind dev's back don't we ?
> So now there is a limit to what a style can and cannot change, and I 
> don't know where it is. I've read reports that bespin did pass the limit 
> (e.g. by adding specific hacks for dedicated applications), and oxygen 
> might well have passed it with e.g. qlabel animations. If this is the 
> case, well, fine, I can remove the animation. But again, this is not 
> obvious to me where the limit is and this might need further discussion 
> (or specification).

I think the limit can be stated like this: a style should not have side 
effects on existing code. For example if I write this:

QSize size = label->size();

Then I expect 'size' to contain the size needed by 'label' to display 
"Foo", not the size needed to display the previous content.


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