Looks like the SIGNAL loadFinished(bool) is not emitted anymore with Qt 6.8.1

Volker75

So the bug is, that this line doesn't work anymore. But why? I need a connect. I can't call it in the constructor like you done it.

connect(pbPrintPreviewFull, SIGNAL(clicked()), this, SLOT(printPre

You must of course press on preview button!

Volker75

BTW: I don't get the "The cached device pixel ratio value was stale on window update. Please file a QTBUG which explains how to reproduce." information. Are you using Windows, Linux or MacOS?
I am currently trying Linux only and Linux doesn't work anymore :-(

Volker75

Ah... Sorry. Reading your mail once again.
Yes, then also the preview button is working. Strange. But the solution doesn't work, since there is a big white preview first and i can't hide it. And after printpreview at should also close, but it stays in the window. So that is not useable. It should work as with Qt 6.7.2.

hskoglund

Hi, the reason the behavior differs between Qt 6.7.2 and Qt 6.8.1 is probably because you're creating the QWebEngineView with your QDialog derived TimetablePrintForm, i.e. not a QWdiget.

Easiest solution is just to omit any parent, like this:

,,,
viewPreview2 = new QWebEngineView(); //notVisible. But must stay alive for printing.
viewPreview2->hide();
...

It was probably just good luck that allowed a QDialog flavoed parent to work anyway in 6.7.2 but in 6.8.1 you run out of it :-)

Volker75

I fear I don't understand it 100%, but it is working now!
Thank you so much!
You have earned my announce reward. Please tell me your PayPal (email) or IBAN here or write me a private message and I will sent you the money..
Can you also tell if I need to care about deleting it now myself?
So do I need to write somewhere "delete viewPreview2" myself now or does the garbage collector already cares about it?

hskoglund

Re. the delete: easiest is to do that in TimetablePrintForm's destructor:

...
TimetablePrintForm::~TimetablePrintForm(){
    delete viewPreview2;
}
...

(in C++ you have to take out the garbage yourself, no GC available)

Volker75

Thank you! I guess the other bug that I wrote some time ago and wrote a link here is because of the same bug. I well mark the other topic from me as solved as soon as I am able the check that also. Thank you!

Volker75

Last question:
I saw in the documentation, that QWebEngineView() has also a close().
Should I close() before delete? (Or only close() and not delete, but I guess that is wrong)

hskoglund

Since your QWebEngineView is hidden anyway (which is essentially what close() does), I don't think a close() is needed, i.e. the delete will suffice.

Volker75

Thank you!