[Qt-interest] [Qt-embedded-interest] pixel errors in QListWidget when setting Qt::WA_NoSystemBackground

[Markus Franke]

Dear Atlant,

as per the docs it looks like QDialog does not support the "border-image" 
CSS stylesheet. I also tried to use it in connection with QDialog but it 
didn't work. I still get the background color of the QDialog in the 
rounded corners. Same happens when using border-radius as a stylesheet.

Somehow, the clipping region does not seem to be set up properly.

Any other suggestions how to properly implement a so common feature as 
"rounded" corners for QDialog?

Thanks and with best regards,
Markus


Atlant Schmidt <aschmidt at dekaresearch.com> schrieb am 10.06.2011 17:08:55:

> Markus:
> 
>   To me, it looks like the anti-aliasing is going wrong when there
>   isn?t a ?SystemBackground? for those objects to be drawn against.
> 
>   But that?s just a guess and doesn?t really help you get closer
>   to a solution, so let me ask a question:
> 
>   When you say ?. In order to get correct "rounded corners" for the
>   dialog I am drawing the whole dialog by myself.?, what do you
>   mean by that? The usual way to get the effect you want is
>   provide a background-image or border-image that contains
>   the ?rounded corners? with appropriate 9-slicing hints to allow
>   Qt to stretch the image without distorting the corners.
> 
>   That method works, even in Qt 4.6.x QWS.
> 
>                                       Atlant
> 
> 
> From: 
qt-embedded-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com [
> 
mailto:qt-embedded-interest-bounces+aschmidt=dekaresearch.com at qt.nokia.com
] 
> On Behalf Of Markus Franke
> Sent: Friday, June 10, 2011 09:58
> To: qt-interest at qt.nokia.com; qt-embedded-interest at qt.nokia.com
> Subject: [Qt-embedded-interest] pixel errors in QListWidget when setting 

> Qt::WA_NoSystemBackground
> 
> 
> Dear all, 
> 
> I am observing strange pixel errors within the icons of items of a 
> QListWidget. (see attached screenshot) 
> 
> Basically I am creating a QDialog derived class which holds the 
> QListWidget. In order to get correct "rounded corners" for the dialog I 
> am drawing the whole dialog by myself. The pixel errors in the 
screenshot
> attached appeared when I enabled the Qt::WA_NoSystemBackground flag for 
> the QDialog. If I remove this flag the images get displayed correctly 
> again but unfortunately the "rounded corners" will then be wrong. Below 
> the QListWidget I added a QLabel with the same icon as in the 
QListWidget
> and there the problem does not occur. 
> 
> Furthermore, the problem only can be observed for the QWS version of Qt 
> Everywhere 4.6.3. The X11 version does not show this behaviour. 
> 
> Thanks for any comments on this, 
> 
> Markus Franke 
> 
> PS.: I sent this message to both lists because I think it's somewhat 
> related to both versions of Qt. 
> 
> 
> 
> 
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