See also https://bugreports.qt.io/browse/QTBUG-89274 and some of the related tasks.
> -----Original Message----- > From: Interest <interest-boun...@qt-project.org> On Behalf Of Jakub > Narolewski > Sent: Wednesday, 28 April 2021 9:54 PM > To: interest@qt-project.org > Subject: [Interest] Porting custom QML plugin to the Qt6 > > Lately, mostly for fame and glory, I decided to port some of my stuff from > Qt5 to Qt6. > Most of it went ok'ish - after some CMakeLists.txt hacking and 'modernizing' > the code I was able to compile two of my dynamic libraries under Qt6. > > Problems started with my custom QML plugin. Here after compiling and > importing my module in my example app I got: > "qrc:/src/QML/MainWindow.qml:5:1: module "IzLibrary" plugin > "IzLibraryPlugin" not found" > > Well oopsie doopsie, some more work is needed. After quick look at: > https://doc.qt.io/qt-6/qtqml-modules-cppplugins.html > > I spotted, I believe, the most important changes. QQmlExtensionPlugin being > changed to QmlEngineExtensionPlugin, QML_ELEMENT added in Qt 5.15.X > and removal of QQmlExtensionPlugin::registerTypes. > > Then I noticed stuff about QML_IMPORT_NAME, > QML_IMPORT_MAJOR_VERSION and 'CONFIG += qmltypes' that are > supposed to be added to the .pro project files. And, although, docs are silent > about CMake, there is handy example located at: > https://code.qt.io/cgit/qt/qtdeclarative.git/tree/examples/qml/qmlextensio > nplugins/CMakeLists.txt?h=6.0 > > I added to my CMakeLists.txt: > > set_target_properties( > IzLibraryPlugin > PROPERTIES > QT_QML_MODULE_VERSION 1.0 > QT_QML_MODULE_URI IzLibrary > ) > > omitting, for the moment, the "QT_QMLTYPES_FILENAME > imports/TimeExample/plugins.qmltypes" > as I was typically generating .qmltypes manually using the supplied > qmlplugindump and some associated CMake hackery. > > I also added the: > > qt6_qml_type_registration(IzLibraryPlugin) > > And this is when first build error occurred. qt6_qml_type_registration seems > to be trying to automate some of the QML type registration machinery and > generates the "izlibraryplugin_qmltyperegistrations.cpp" file. In my case it > looks like this: > > #include <QtQml/qqml.h> > #include <QtQml/qqmlmoduleregistration.h> > > #include <CountdownTimer.h> > #include <DoubleValidator.h> > #include <IntValidator.h> > > void qml_register_types_IzLibrary() > { > qmlRegisterTypesAndRevisions<IzLibrary::CountdownTimer>("IzLibrary", > 1); > qmlRegisterTypesAndRevisions<IzLibrary::DoubleValidator>("IzLibrary", > 1); > qmlRegisterTypesAndRevisions<IzLibrary::IntValidator>("IzLibrary", 1); > QMetaType::fromType<QDoubleValidator *>().id(); > QMetaType::fromType<QIntValidator *>().id(); > qmlRegisterModule("IzLibrary", 1, 0); } > > static const QQmlModuleRegistration registration("IzLibrary", > qml_register_types_IzLibrary); > > > But! My includes are not available under <SomeBeautifulHeader.h> but > rather under "IzLibrary/SomeBeautifulHeader.h" as denoted by my > target_include_directories: > > # include directories for target > target_include_directories( > IzLibraryPlugin > PUBLIC > $<INSTALL_INTERFACE:include> > $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include> > PRIVATE > ${CMAKE_CURRENT_SOURCE_DIR}/private > ) > > So, my questions (for now :P) are: > Is this the intended behavior or have I fubared something and not added > "something, somewhere" in my CMakeLists.txt? > Is there a documentation for the qt6_* cmake functions? > Is the stuff "qt6_add_qml_module" important or can I skip it? > _______________________________________________ > Interest mailing list > Interest@qt-project.org > https://lists.qt-project.org/listinfo/interest _______________________________________________ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
