General and Desktop

I solved my problem by reimplementing MyTableView::dropEvent(QDropEvent *event). Here it is: void MyTableView::dropEvent(QDropEvent *event){ const QMimeData *mime = event->mimeData(); QStringList typeList = model()->mimeTypes(); if (typeList.isEmpty()) return; int sourceRow, sourceCol; QByteArray encodedData = mime->data(typeList[0]); // retrieve first row and col from first selectem item QDataStream stream(&encodedData, QIODevice::ReadOnly); stream >> sourceRow >> sourceCol; QTableView* sourceTableView = qobject_cast<QTableView*> (event->source()); // get tableview from item goes if (sourceTableView == nullptr) return; // as a result we have source table view, current table view, row and col of dragged item. That is enough to process dragged data and paste it to current model }

OK, so I just connected QApplication::focusChange to a slot in the main window where I ask the question "is the widget that now has focus a view of the type I am interested in?" If yes, I change the related menus accordingly. The "Ah Ha!" moment for me indeed was to think about the views, not the docks. I first tried installing an event filter on the views to look for FocusIn events, which works, but even that is unnecessary given the focusChange api available from the QApplication.

@mbruel said in QAbstractListModel populated in a Worker Thread (not the GUI one)?: Well I don't see how to manage that if it's the Working Thread that updates the data... Doing some synchronisation in order to achieve it would be just less efficient than letting the main thread updating the data... Correct, therefore my recommendation - don't try it :)

It turns out the solution to this is simple, though I had to read a whole bunch of confusing descriptions of scalability. It really should be easier to find. And the Qt support pages on the topic could be less confusing. https://stackoverflow.com/questions/41331201/pyqt-5-and-4k-screen Put this in your setup code before creating the QGuiApplication, to support High DPI scaling on Windows: os.environ["QT_AUTO_SCREEN_SCALE_FACTOR"] = "1" sys.argv += ['--style', 'fusion'] app = QGuiApplication(sys.argv) The font scaling ends up a little bit different, but that is acceptable for my use case. For C++ users, look here: https://doc.qt.io/qt-5/qtquickcontrols2-highdpi.html Whew! I was getting nervous about my decision to create this cross platform UI.

@taedooly said in How can I access json data at c++ code in qml?: does QJsonObject type support direct access in qml? QML converts the QVariantMap type to a JSON object. So simply call QJsonObject::toVariantMap() and pass it to on

I guess so, thank you for your replies.

@Perdrix said in Constructing a std::filesystem::path from a QString: it's just that I've been bitten before by stuff that felt like it ought to work but didn't! Still no clear answer :) When the path is properly constructed I don't see what should go wrong here.

Ownership and qobject parent / child relationship are two similar but different things. Just because an object takes ownership of another object there is not need that one is the parent of the other.

'widget' is a really bad name when you want to use findChild. Also why do you search for a QObject when you case it to a OSGWidget later on? Why not directly searching for a OSGWidget?

Use the Qt online installer to use the official binaries instead some third party stuff

@devillIsHeree Did you try any Googling for, say: Qt vlc-qt thumbnail ? E.g. Start from the comments to https://stackoverflow.com/questions/31448313/video-preview-image-using-vlc-qt-or-libvlc-directly, https://forum.videolan.org/viewtopic.php?t=148937, and several others.

just detected that myself, thanks!

@SGaist , @Helg1980 Sorry, you can see from what I wrote I just missed the this parameter. My bad.

AFAIK, you can reuse the same concepts that are used for C++ with some language adaptation.

@Nocturnal said in How to use signal from QPushButton to Main.cpp: static variables What do you mean with this? Signal/slots need objects. See the documentation.

@Cocojambo said in How to make QList const from outside: Can I prohibit copying reference and cloning the source array as result in any way from my class? No - it's a copy so the 'user' can do what he wants.