Which begs the question of if it's worth it to bother with QML at all, or at least, when there is the option of something else like widgets. It has a more complex model of mixing the two worlds, it requires additional build system support, and the tooling support is also an additional layer that can break more often, even for trivial examples like in https://bugreports.qt.io/browse/QTCREATORBUG-24987 <https://bugreports.qt.io/browse/QTCREATORBUG-24987> (which BTW, has at least two people saying that it isn't fixed, and I did not comment myself because I stopped caring).
Well, yes, QML is a separate language that needs separate tooling and build system support. The very least of this is the simple "pack QML files into qrc" that qmake does, but even that is more than nothing. With widgets you can indeed write everything in C++, but because it's C++ it will take longer and contain uglier bugs.
QTCREATORBUG-24987 is actually a symptom of papering over the language barrier with sloppy heuristics. Qt Creator scans C++ code for instances of "qmlRegisterType" and assumes all of those are QML type registrations and will be available to all your QML files. Needless to say that this is not very accurate, and it stops working once the magic "qmlRegisterType" does not show up in C++ code anymore. With qmltyperegistrar processing QML_ELEMENT and friends we get an accurate way of associating C++ types with QML modules and as a result we know what C++ types are visible in which QML files. If each QML module is properly structured and placed in a QML import path, Qt Creator can resolve modules and types using the actual language semantics rather than a collection of hacks. That is, it parses the qmltypes file that belongs to a QML module to figure out what's in there. The CMake build system support allows you to easily create such well-structured modules. With qmake you will have a hard time.
best regards, Ulf _______________________________________________ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
