General and Desktop

@JonB oh that was really stupid. I was meant to check another QVector of QPolygons...

Solved with the last Qt version.

@J-Hilk This is probably not the place for a discussion, but yes I think it's hard to read/understand. WTF is that | logical-or operator doing in the for against arrays? (Yes, I can guess...) Is it really easier to read or more efficient than an if inside the loop? Depending on how that for ( ... | ...) is implemented, it could be hideously inefficient!

@JonB said in QFlags and static functions: it always resolves to MyTestClass::workweek, one would have to have written ::workweek to resolve to the global one? Correct

@RahibeMeryem I don't think you can get at that. You're not supposed to do that, or need to do that. Also, if your signals/slots are the (default) direct connection (not queued connection), slots are executed immediately from the signal emit(), so I don't think there is a queue to get at anyway(?)....

Not sure if it works (and if I understand your question correctly), but have you tried this? win32: { CONFIG(debug, debug|release): ///whatever, if you need it else:CONFIG(release, release|debug): QMAKE_CXXFLAGS += /DPORTABLE }

Hi SGaist, I think I solved it. The missing puzzle piece was 'Preferred Applications' in the Mint settings tree. I believe that's what gets looked at, and I wasn't aware of it. I think it's safest to use browsers available in Synaptic. As I said, Firefox was not, so no conclusion there. I see from surfing around that Chromium used to have a problem with this error, and apparently, from my tests, it's still there. Opera is not in the channel. I found that both Arora and Falkon work. In a nod to QT, I'll use Falkon, at least for now. thanks for reading the post. gary

Hi, and welcome! @aloknj said in Qt platform plug-in missing: I am trying to use new software Where did you get the software from? but each time I try to open it up ,I get a message saying that no Qt platform plug-in could be initialized.. what is this ,where do I get it ? This message is telling you that a Qt DLL could not be loaded correctly. However, we don't have enough information to tell you why your software failed to load the DLL. The software was written by a person , software has to do with radio hobby related things. There are Qt commands in the software. Can you contact this person? They should know how to fix the problem.

@Chris-Kawa said in Interface for class in Qt. How?: and that adds some extra functionality (qobject_cast for example) Thx ... This point is what I've been missing. Issue closed.

@mrjj Perfect thanks!

Hi, You can test various version of the QGraphicsScene::ViewportUpdateMode.

I guess one way to do this would be to call setData on my items in the scene and add some meaningful tag to the items like some string to identify them and hide my items so they don't update and then when I want to resume updates( calling update on all items at one time) , I call items() in the scene, find the items I want to update and call update() on each item manually... any ideas on if I should expect a performance improvement in doing things this way?

@sandro4912 is your issue solved? if so please don't forget to mark your post as such! Thanks

@Zunneh Yes to your question about needing to disambiguate/resolve same-name in multi-inheritance via class::, like QTreeWidgetItem::parent(). Of course, if you redesign like we said this would not be an issue :) And if you are going to redesign, the sooner you change code instead of continuing as now the better, instead of spending time on this sort of issue!

@Daniel-Williams A useful post. However, I tried to help you earlier and I still don't know why you found it impossible. I do admit I have not tried this stuff(!) But... I was able to get QDomNode from Stanislaw Adeszewski searching the dom working well. But, I was not able to get the QDomNode that is returned to actually update the underlying QDomDocument. https://doc.qt.io/qt-5/qdomnode.html#details says: Nodes are inserted with insertBefore(), insertAfter() or appendChild(). You can replace one node with another using replaceChild() and remove a node with removeChild(). That's inserting/replacing/updating nodes covered. findChild() etc. find QDomNodes in the document. And https://doc.qt.io/qt-5/qdomnode.html#setNodeValue covers replacing a text node's text. So not sure what did not work for you, I would have thought all of these will modify your QDomDocument, no?

@rtavakko In my experience a lot of old stuff out there going back to 2009 can still be useful in Qt5 2019 :)

thank, Solved