Animated labels and progress bars in Oxygen considered harmful?

Aurélien Gâteau agateau at
Wed Dec 2 17:15:21 GMT 2009

Hugo Pereira Da Costa wrote:
> On 12/02/2009 09:27 AM, Aurélien Gâteau wrote:
>> 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:
>> label->setText("Foo");
>> label->adjustSize();
>> 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.
> mmm. That's what it is now (and if the old text is displayed during the 
> animation, it is truncated).
> Or do I get it wrong ?

I must confess I haven't tested it. Thinking of it, you are probably 
right this will return a correct value.

Still I consider this change a regression. If it's not reverted, I will 
have to write a custom widget because QLabel can't be trusted anymore.


More information about the kde-core-devel mailing list