QTabWidget rendering issue?

[Maurizio Berti]

This doesn't seem to be a PyQt related issue.

I suggest you to provide a proper minimal reproducible code, either here or
at least on a Qt forum or StackOverflow post, and eventually share the link
here.

Note that, if you're using QSS, you should always::
- ensure that you're using proper selectors, especially if the QSS is set
on parents or the whole QApplication;
- remember that styling complex widgets requires setting **all** their
properties as soon as even one is set; using generic properties (such
as setStyleSheet('background:
gray;')) at **any** level above any possibly affected widget may result in
unexpected behavior;
- consider that QSS are always inherited by child widgets, so verify that
you're not setting any generic/arbitrary QSS with code or by using a
Designer UI;

Cheers,
MaurizioB

Il giorno sab 27 apr 2024 alle ore 19:36 Matic Kukovec <
kukovecmatic at hotmail.com> ha scritto:

> I apologize, the screenshot for the overriden sizeHint method:
>
> def sizeHint(self):
>             return super().sizeHint()*2
>
> looks actually like this:
> ------------------------------
> *From:* Matic Kukovec <kukovecmatic at hotmail.com>
> *Sent:* Saturday, April 27, 2024 7:23 PM
> *To:* PyQt at riverbankcomputing.com <pyqt at riverbankcomputing.com>
> *Subject:* Re: QTabWidget rendering issue?
>
> Also note that any 'repaint', 'polish' and 'unpolish' methods on the
> QTabBar have no effect in the tab-bar in this state,
> only clicking on another tab renders it correctly.
> ------------------------------
> *From:* Matic Kukovec <kukovecmatic at hotmail.com>
> *Sent:* Saturday, April 27, 2024 7:09 PM
> *To:* PyQt at riverbankcomputing.com <pyqt at riverbankcomputing.com>
> *Subject:* Re: QTabWidget rendering issue?
>
> I tried overriding the 'sizeHint' method of the QTabBar with this to see
> what would happen:
>
> def sizeHint(self):
>             return super().sizeHint()*2
>
> but that only changes the initial tabs to this:
> ------------------------------
> *From:* Matic Kukovec <kukovecmatic at hotmail.com>
> *Sent:* Saturday, April 27, 2024 6:50 PM
> *To:* Charles <peacech at gmail.com>
> *Cc:* PyQt at riverbankcomputing.com <pyqt at riverbankcomputing.com>
> *Subject:* Re: QTabWidget rendering issue?
>
> Ok, thanks, will do some testing into that direction.
> ------------------------------
> *From:* Charles <peacech at gmail.com>
> *Sent:* Saturday, April 27, 2024 6:34 PM
> *To:* Matic Kukovec <kukovecmatic at hotmail.com>
> *Cc:* PyQt at riverbankcomputing.com <pyqt at riverbankcomputing.com>
> *Subject:* Re: QTabWidget rendering issue?
>
> Maybe QTabWidget does not compute the sizeHint based on the custom font
> size?
>
> On Sat, Apr 27, 2024 at 11:12 PM Matic Kukovec <kukovecmatic at hotmail.com>
> wrote:
>
> This happens even without any styling changes, seen here:
> Note that this is a plain vanilla QTabBar, no sub-classing.
>
> Regards,
> Matic
>
> ------------------------------
> *From:* Matic Kukovec <kukovecmatic at hotmail.com>
> *Sent:* Saturday, April 27, 2024 12:59 PM
> *To:* PyQt at riverbankcomputing.com <pyqt at riverbankcomputing.com>
> *Subject:* QTabWidget rendering issue?
>
> Hi guys,
>
> Specs:
>
>    - Windows 10 x64
>    - Python 3.12
>    - PyQt 6.6.1
>
>
> I have a QTabWidget inside a layout and when initial layout is built not
> all of tabs are rendered.
> The selected tab is rendered as the first tab, but when I select a
> different tab, all the tabs render correctly,
> here is an example:
> As you can see, when the initial layout is rendered the 'systick.c' tab is
> shown as the first, but in reality
> the 'main.c' tab should be first, but it only appears after I click any
> non-current tab.
>
> Any idea of where the problem is?
>
> Regards,
> Matic
>
>

-- 
È difficile avere una convinzione precisa quando si parla delle ragioni del
cuore. - "Sostiene Pereira", Antonio Tabucchi
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