Make QML UI compatible with Qt 6 #4649

Holzhaus · 2022-01-27T12:14:33Z

Please see the individual commit messages for details.

Note: This makes QML Qt6-only because the qml type registration changed considerably since Qt 5.12.

ywwg

it's too bad we lose QML on qt5, but if they are that incompatible then I agree it's the right thing to do. One small change requested.

uklotzde

Some minor suggestions for improvements, mostly C++ stuff.

src/qml/qmlconfigproxy.cpp

uklotzde · 2022-01-29T11:57:30Z

src/qml/qmlconfigproxy.h

+        Q_UNUSED(pQmlEngine);
+
+        // The instance has to exist before it is used. We cannot replace it.
+        Q_ASSERT(s_pInstance);


Why did you use Q_ASSERT instead of the custom DEBUG_ASSERT?

The definition of this function should be moved from the header into the .cpp file.

Why did you use Q_ASSERT instead of the custom DEBUG_ASSERT?

It's the code taken from last example in https://doc.qt.io/qt-6/qqmlengine.html#QML_SINGLETON .

The definition of this function should be moved from the header into the .cpp file.

I'd like to deduplicate the code anyway. I tried with a template class and it compiled, but didn't work properly. Do you have an idea?

No idea. I didn't need singletons for a long time.

Templates should work for singletons, because each instantiated template becomes a distinct type. Similar to monomorphization in Rust.

I added a comment regarding the source of this code, and replaced Q_ASSERT with DEBUG_ASSERT.

src/qml/qmldlgpreferencesproxy.h

src/qml/qmleffectsmanagerproxy.h

src/qml/qmllibraryproxy.h

uklotzde · 2022-01-29T19:14:47Z

What am I missing?

[177/908] Running moc --collect-json for target mixxx-lib
FAILED: meta_types/qt6mixxx-lib_debug_metatypes.json.gen meta_types/qt6mixxx-lib_debug_metatypes.json /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json.gen /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json 
cd /home/uk/volumes/Build/cpp/mixxx/build.qt6 && /usr/lib64/qt6/libexec/moc -o /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json.gen --collect-json @/home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/mixxx-lib_json_file_list.txt && /usr/bin/cmake -E copy_if_different /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json.gen /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json
Error opening /home/uk/volumes/Build/cpp/mixxx/build.qt6/mixxx-lib_autogen/include/../DE3FZXEUDL/moc_libraryfeature.cpp.json for reading
[178/908] Linking CXX static library qml/Mixxx/libmixxx-libplugin.a
ninja: build stopped: subcommand failed.

Holzhaus · 2022-01-29T20:58:25Z

What am I missing?

[177/908] Running moc --collect-json for target mixxx-lib
FAILED: meta_types/qt6mixxx-lib_debug_metatypes.json.gen meta_types/qt6mixxx-lib_debug_metatypes.json /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json.gen /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json 
cd /home/uk/volumes/Build/cpp/mixxx/build.qt6 && /usr/lib64/qt6/libexec/moc -o /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json.gen --collect-json @/home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/mixxx-lib_json_file_list.txt && /usr/bin/cmake -E copy_if_different /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json.gen /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json
Error opening /home/uk/volumes/Build/cpp/mixxx/build.qt6/mixxx-lib_autogen/include/../DE3FZXEUDL/moc_libraryfeature.cpp.json for reading
[178/908] Linking CXX static library qml/Mixxx/libmixxx-libplugin.a
ninja: build stopped: subcommand failed.

Hmm, I'll just checked if I can build with Ninja on my machine, and for me there are 878 tasks, not 908?!

I used these commands:

$ mkdir build-qt6 && cmake -G Ninja -DQT6=ON -DWARNINGS_FATAL=ON -DDEBUG_ASSERTIONS_FATAL=ON .. && cmake --build . && ctest -j $(nproc)

What commands did you use? What Qt version (I'm using Qt 6.2.2)?

uklotzde · 2022-01-29T23:33:29Z

What am I missing?

[177/908] Running moc --collect-json for target mixxx-lib
FAILED: meta_types/qt6mixxx-lib_debug_metatypes.json.gen meta_types/qt6mixxx-lib_debug_metatypes.json /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json.gen /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json 
cd /home/uk/volumes/Build/cpp/mixxx/build.qt6 && /usr/lib64/qt6/libexec/moc -o /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json.gen --collect-json @/home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/mixxx-lib_json_file_list.txt && /usr/bin/cmake -E copy_if_different /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json.gen /home/uk/volumes/Build/cpp/mixxx/build.qt6/meta_types/qt6mixxx-lib_debug_metatypes.json
Error opening /home/uk/volumes/Build/cpp/mixxx/build.qt6/mixxx-lib_autogen/include/../DE3FZXEUDL/moc_libraryfeature.cpp.json for reading
[178/908] Linking CXX static library qml/Mixxx/libmixxx-libplugin.a
ninja: build stopped: subcommand failed.

Hmm, I'll just checked if I can build with Ninja on my machine, and for me there are 878 tasks, not 908?!

I used these commands:

$ mkdir build-qt6 && cmake -G Ninja -DQT6=ON -DWARNINGS_FATAL=ON -DDEBUG_ASSERTIONS_FATAL=ON .. && cmake --build . && ctest -j $(nproc)

What commands did you use? What Qt version (I'm using Qt 6.2.2)?

Qt 6.2.2. The number of tasks may vary due to some code (aoide, ...).

I am using an absolute path to reference the build directory! ~~The code tree is rsynced to another volume and built there, while cmake is invoked from the current working directory.~~ I am invoking cmake from the build directory, but with an absolute path. Could try to replace it with .. instead.

uklotzde · 2022-01-29T23:51:21Z

Neither using .. nor GNU make worked, still the same issue:

[ 19%] Running moc --collect-json for target mixxx-lib
Error opening /home/uk/volumes/Build/cpp/mixxx/build.qt6/mixxx-lib_autogen/include/../DE3FZXEUDL/moc_libraryfeature.cpp.json for reading
gmake[2]: *** [CMakeFiles/mixxx-lib.dir/build.make:75: meta_types/qt6mixxx-lib_debug_metatypes.json.gen] Error 1
gmake[2]: *** Deleting file 'meta_types/qt6mixxx-lib_debug_metatypes.json.gen'
gmake[1]: *** [CMakeFiles/Makefile2:293: CMakeFiles/mixxx-lib.dir/all] Error 2
gmake: *** [Makefile:166: all] Error 2

uklotzde · 2022-01-29T23:55:57Z

Building this branch directly works. I have to check what else did change in the mean time that my code doesn't build anymore.

uklotzde · 2022-01-30T16:40:14Z

@Holzhaus Qt6 Automoc fails for source files with equal names that are found in different namespaces/directories. Adding a directory prefix to include the _moc.cpp files doesn't work either. The only workaround is renaming the source files.

Some source files without any Qt macros need to be renamed even though automoc then outputs "No relevant classes found. No output generated."

I wonder why this worked for Qt 5 but now fails for Qt 6.

Conflict example: library/libraryfeature.h/.cpp and aoide/libraryfeature.h/.cpp.
False positive: aoide/json/track.h/.cpp

Holzhaus · 2022-01-30T16:43:20Z

@uklotzde Is this issue related to your changes or is this an issue with this PR specifically? If so, which files do I need to rename?

uklotzde · 2022-01-30T16:45:59Z

Not related to this PR, fails for Qt 6 in general, that's why I mentioned it. My previous comments are therefore not relevant for this PR.

daschuer · 2022-01-30T18:40:28Z

I have just finished my PPA with Qt 6.2.2 backports: https://launchpad.net/~daschuer/+archive/ubuntu/qt6-backports/+packages

It build with this branch, but unfortunately Mixxx stops with:

warning [Main] QQmlApplicationEngine failed to load component
warning [Main] file:///home/daniel/workspace/mixxxqt6/res/qml/main.qml:2:1: module "Mixxx" plugin "mixxx-libplugin" not found
critical [Main] Failed to load QML file "/home/daniel/workspace/mixxxqt6/res/qml/main.qml"

I have a /home/daniel/workspace/mixxxqt6/build/Debug/qml/Mixxx/libmixxx-libplugin.a but it is probably not found.
How can we enable running from the build dir?

Holzhaus · 2022-01-30T19:36:56Z

I have a /home/daniel/workspace/mixxxqt6/build/Debug/qml/Mixxx/libmixxx-libplugin.a but it is probably not found.
How can we enable running from the build dir?

Works for me. I run it directly from the build dir. The plugin is linked here: https://github.com/mixxxdj/mixxx/pull/4649/files#diff-1e7de1ae2d059d21e1dd75d5812d5a34b0222cef273b7c3a2af62eb747f9d20aR2173

daschuer · 2022-01-30T19:47:39Z

I can confirm that the link call for mixxx contains mixxx-libplugin.a But when I start Mixxx I still see the complaining line pasted above. Is there a registration or something missing?

Holzhaus · 2022-01-30T19:57:41Z

Did you try with a completely clean build dir?

These are the commands I used:

$ mkdir build-qt6  // does not exist yet
$ cmake -G Ninja -DQT6=ON -DWARNINGS_FATAL=ON -DDEBUG_ASSERTIONS_FATAL=ON .. && cmake --build . && ctest -j $(nproc)
$ ./mixxx

daschuer · 2022-01-30T20:44:10Z

I have applied the suggested command, but the result is exactly the same.

Holzhaus · 2022-01-30T20:59:43Z

@uklotzde Did you try to run it on Fedora?

I have applied the suggested command, but the result is exactly the same.

As I said, it works on Arch. If it also works on Fedora, I suppose your qt6 packages might be broken or something?

uklotzde · 2022-01-30T21:08:21Z

warning [Main] QQmlApplicationEngine failed to load component
warning [Main] file:///home/uk/volumes/Build/cpp/mixxx/res/qml/main.qml:35:17: Type Skin.Button unavailable
warning [Main] file:///home/uk/volumes/Build/cpp/mixxx/res/qml/Button.qml:1:1: module "Qt5Compat.GraphicalEffects" is not installed
critical [Main] Failed to load QML file "/home/uk/volumes/Build/cpp/mixxx/res/qml/main.qml"

Installed Packages
Name         : qt6-qt5compat
Version      : 6.2.2
Release      : 1.fc35
Architecture : x86_64
Size         : 499 k
Source       : qt6-qt5compat-6.2.2-1.fc35.src.rpm
Repository   : @System
From repo    : updates
Summary      : Qt6 - Qt 5 Compatibility Libraries
URL          : http://www.qt.io
License      : LGPLv3
Description  : Qt6 - Qt 5 Compatibility Libraries.

@Swiftb0y Is this the problem you mentioned with the Fedora packaging?

daschuer · 2022-01-30T21:10:02Z

@Holzhaus is there a way to debug this?

The qml statement is

import Mixxx 0.1 as Mixxx

so the code already knows to look at "mixxx-libplugin". How does it know that?

uklotzde · 2022-01-30T21:14:01Z

@daschuer I have started Mixxx directly from the build directory with ./mixxx and the resources are found as the log shows.

daschuer · 2022-01-30T21:18:16Z

I can reproduce you log with
./mixxx --resourcePath res

my issue appears with

./mixxx --resourcePath ../../res

and just

./mixxx

all from my build directory.

Swiftb0y · 2022-01-30T21:43:10Z

@Swiftb0y Is this the problem you mentioned with the Fedora packaging?

Yes. I worked around it by building the Qt module from source and the installing it to /usr/lib64 (instead of /usr/local/lib64).
Unfortunately there hasn't happened much in the bug. https://bugzilla.redhat.com/show_bug.cgi?id=2047369
Another possibility might be cloning from source and then patching the import directory using the QML2_IMPORT_PATH env variable.

daschuer · 2022-01-30T21:43:26Z

CMakeLists.txt

+  # QTBUG-87221. We should figure out a better way to fix this.
+  # See: https://bugreports.qt.io/browse/QTBUG-87221
+  target_include_directories(mixxx-lib PRIVATE src/control src/qml)
+  target_link_libraries(mixxx-lib PRIVATE mixxx-libplugin)


Where does mixxx-libplugin come from? Interestingly it is linked directly to mixxx in my case and appears two times in the link command line:

qml/Mixxx/libmixxx-libplugin.a libmixxx-lib.a qml/Mixxx/libmixxx-libplugin.a

here the whole line

usr/bin/c++ -fdiagnostics-color=auto -g CMakeFiles/mixxx.dir/src/main.cpp.o CMakeFiles/mixxx.dir/mixxx_autogen/PNK5WDWK6L/qrc_mixxx.cpp.o CMakeFiles/mixxx-lib_resources_1.dir/build/Debug/.rcc/qrc_qmake_Mixxx.cpp.o CMakeFiles/mixxx-lib_qmlcache.dir/build/Debug/.rcc/qmlcache/mixxx-lib_qmlcache_loader.cpp.o CMakeFiles/mixxx-lib_resources_2.dir/build/Debug/.rcc/qrc_mixxx-lib_raw_qml_0.cpp.o -o mixxx -Wl,-rpath,/usr/local/lib: libmixxx-lib.a libmixxx-gitinfostore.a qml/Mixxx/libmixxx-libplugin.a libmixxx-lib.a qml/Mixxx/libmixxx-libplugin.a /usr/lib/x86_64-linux-gnu/libchromaprint.so /usr/lib/x86_64-linux-gnu/libsqlite3.so lib/libdjinterop-install/lib/libdjinterop.a /usr/lib/x86_64-linux-gnu/libz.so /usr/lib/x86_64-linux-gnu/libebur128.so libfidlib.a lib/keyfinder-install/lib/libkeyfinder.a /usr/lib/x86_64-linux-gnu/libfftw3.so /usr/lib/x86_64-linux-gnu/libFLAC.so libFpClassify.a /usr/lib/x86_64-linux-gnu/libmp3lame.so libKaitai.a libMP3GuessEnc.a /usr/lib/x86_64-linux-gnu/libvorbisfile.so /usr/local/lib/libportaudio.so libPortAudioRingBuffer.a /usr/lib/x86_64-linux-gnu/libportmidi.so /usr/lib/x86_64-linux-gnu/libporttime.so /usr/lib/x86_64-linux-gnu/libprotobuf-lite.so /usr/lib/x86_64-linux-gnu/libQt6Concurrent.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6PrintSupport.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6QuickWidgets.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6Quick.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6QmlModels.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6OpenGL.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6Sql.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6Test.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6Xml.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6SvgWidgets.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6Svg.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6Widgets.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6Gui.so.6.2.2 /usr/lib/x86_64-linux-gnu/libGLX.so /usr/lib/x86_64-linux-gnu/libOpenGL.so /usr/lib/x86_64-linux-gnu/libQt6Core5Compat.so.6.2.2 qml/Mixxx/Controls/libmixxx-qml-mixxxcontrolsplugin.a libmixxx-qml-mixxxcontrols.a /usr/lib/x86_64-linux-gnu/libSM.so /usr/lib/x86_64-linux-gnu/libICE.so /usr/lib/x86_64-linux-gnu/libX11.so /usr/lib/x86_64-linux-gnu/libXext.so /usr/lib/x86_64-linux-gnu/libQt6DBus.so.6.2.2 libQueenMaryDsp.a libReplayGain.a libReverb.a /usr/lib/x86_64-linux-gnu/librubberband.so /usr/lib/x86_64-linux-gnu/libsndfile.so /usr/lib/x86_64-linux-gnu/libSoundTouch.so /usr/lib/x86_64-linux-gnu/libtag.so /usr/lib/x86_64-linux-gnu/libupower-glib.so /usr/lib/x86_64-linux-gnu/libglib-2.0.so /usr/lib/x86_64-linux-gnu/libgobject-2.0.so /usr/lib/x86_64-linux-gnu/libavcodec.so /usr/lib/x86_64-linux-gnu/libavformat.so /usr/lib/x86_64-linux-gnu/libavutil.so /usr/lib/x86_64-linux-gnu/libswresample.so /usr/lib/x86_64-linux-gnu/liblilv-0.so lib/libshout-idjc/libshout_mixxx.a /usr/lib/x86_64-linux-gnu/libogg.so /usr/lib/x86_64-linux-gnu/libvorbis.so /usr/lib/x86_64-linux-gnu/libvorbisenc.so /usr/lib/x86_64-linux-gnu/libssl.so /usr/lib/x86_64-linux-gnu/libcrypto.so /usr/lib/libopusfile.so /usr/lib/x86_64-linux-gnu/libopus.so /usr/lib/x86_64-linux-gnu/libmad.so /usr/lib/x86_64-linux-gnu/libid3tag.so /usr/lib/x86_64-linux-gnu/libmodplug.so /usr/lib/x86_64-linux-gnu/libqt6keychain.so.0.13.2 libmixxx-hidapi.a /usr/lib/x86_64-linux-gnu/libudev.so /usr/lib/x86_64-linux-gnu/libusb-1.0.so libmixxx-xwax.a /usr/lib/x86_64-linux-gnu/libwavpack.so /usr/lib/x86_64-linux-gnu/libQt6Qml.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6Network.so.6.2.2 /usr/lib/x86_64-linux-gnu/libQt6Core.so.6.2.2 -pthread

This is described in https://www.qt.io/blog/qml-modules-in-qt-6.2 in "Multiple modules in one binary". Please see the commit message of 88320b2 for more links about the Qt 6 QML module system.

It is also part of libmixxx-lib.a see below. Is target_link_libraries(mixxx-lib PRIVATE mixxx-libplugin) redundant?

/usr/bin/ar qc libmixxx-lib.a CMakeFiles/mixxx-lib.dir/mixxx-lib_autogen/mocs_compilation.cpp.o CMakeFiles/mixxx-lib.dir/src/analyzer/analyzerbeats.cpp.o CMakeFiles/mixxx-lib.dir/src/analyzer/analyzerebur128.cpp.o CMakeFiles/mixxx-lib.dir/src/analyzer/analyzergain.cpp.o CMakeFiles/mixxx-lib.dir/src/analyzer/analyzerkey.cpp.o CMakeFiles/mixxx-lib.dir/src/analyzer/analyzersilence.cpp.o CMakeFiles/mixxx-lib.dir/src/analyzer/analyzerthread.cpp.o CMakeFiles/mixxx-lib.dir/src/analyzer/analyzerwaveform.cpp.o CMakeFiles/mixxx-lib.dir/src/analyzer/plugins/analyzerqueenmarybeats.cpp.o CMakeFiles/mixxx-lib.dir/src/analyzer/plugins/analyzerqueenmarykey.cpp.o CMakeFiles/mixxx-lib.dir/src/analyzer/plugins/analyzersoundtouchbeats.cpp.o CMakeFiles/mixxx-lib.dir/src/analyzer/plugins/buffering_utils.cpp.o CMakeFiles/mixxx-lib.dir/src/analyzer/trackanalysisscheduler.cpp.o CMakeFiles/mixxx-lib.dir/src/audio/frame.cpp.o CMakeFiles/mixxx-lib.dir/src/audio/types.cpp.o CMakeFiles/mixxx-lib.dir/src/audio/signalinfo.cpp.o CMakeFiles/mixxx-lib.dir/src/audio/streaminfo.cpp.o CMakeFiles/mixxx-lib.dir/src/control/control.cpp.o CMakeFiles/mixxx-lib.dir/src/control/controlaudiotaperpot.cpp.o CMakeFiles/mixxx-lib.dir/src/control/controlbehavior.cpp.o CMakeFiles/mixxx-lib.dir/src/control/controlcompressingproxy.cpp.o CMakeFiles/mixxx-lib.dir/src/control/controleffectknob.cpp.o CMakeFiles/mixxx-lib.dir/src/control/controlencoder.cpp.o CMakeFiles/mixxx-lib.dir/src/control/controlindicator.cpp.o CMakeFiles/mixxx-lib.dir/src/control/controlindicatortimer.cpp.o CMakeFiles/mixxx-lib.dir/src/control/controllinpotmeter.cpp.o CMakeFiles/mixxx-lib.dir/src/control/controllogpotmeter.cpp.o CMakeFiles/mixxx-lib.dir/src/control/controlmodel.cpp.o CMakeFiles/mixxx-lib.dir/src/control/controlsortfiltermodel.cpp.o CMakeFiles/mixxx-lib.dir/src/control/controlobject.cpp.o CMakeFiles/mixxx-lib.dir/src/control/controlobjectscript.cpp.o 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in https://www.qt.io/blog/qml-modules-in-qt-6.2 they have
target_link_libraries(main_program PRIVATE extra_moduleplugin)
where main_program is the the binary, mixxx in our case.
Maybe there is something messed when linking to a library.

Swiftb0y · 2022-01-30T21:44:19Z

Related / possibly helpful: https://doc.qt.io/qt-5/qtquick-debugging.html#debugging-module-imports

daschuer · 2022-01-30T22:11:51Z

If I remove the line res/qml/main.qml:2 I get:

warning [Main] file:///home/sperry/workspace/mixxxqt6/res/qml/main.qml:34:17: Type Skin.Button unavailable
warning [Main] file:///home/sperry/workspace/mixxxqt6/res/qml/Button.qml:99:9: Type Glow unavailable
warning [Main] qrc:/qt-project.org/imports/Qt5Compat/GraphicalEffects/Glow.qml:53:1: module "Qt5Compat.GraphicalEffects.private" is not installed
critical [Main] Failed to load QML file "/home/sperry/workspace/mixxxqt6/res/qml/main.qml"

Maybe I am missing a private package?

Holzhaus · 2022-01-30T23:20:02Z

If I remove the line res/qml/main.qml:2 I get:

warning [Main] file:///home/sperry/workspace/mixxxqt6/res/qml/main.qml:34:17: Type Skin.Button unavailable
warning [Main] file:///home/sperry/workspace/mixxxqt6/res/qml/Button.qml:99:9: Type Glow unavailable
warning [Main] qrc:/qt-project.org/imports/Qt5Compat/GraphicalEffects/Glow.qml:53:1: module "Qt5Compat.GraphicalEffects.private" is not installed
critical [Main] Failed to load QML file "/home/sperry/workspace/mixxxqt6/res/qml/main.qml"

Maybe I am missing a private package?

Looks like your Qt6 install is broken.

daschuer · 2022-01-30T23:29:51Z

I have now added the Qt5Compat.GraphicalEffects.private.
Unfortunately the original issue still persists.

daschuer · 2022-01-30T23:50:32Z

When I change it to PUBLIC, it works.
target_link_libraries(mixxx-lib PUBLIC mixxx-libplugin)

Now it complains about

warning [Main] QQmlApplicationEngine failed to load component
warning [Main] file:///home/sperry/workspace/mixxxqt6/res/qml/main.qml:104:9: Type Skin.DeckRow unavailable
warning [Main] file:///home/sperry/workspace/mixxxqt6/res/qml/DeckRow.qml:70:5: Type Deck unavailable
warning [Main] file:///home/sperry/workspace/mixxxqt6/res/qml/Deck.qml:38:5: Type Skin.DeckInfoBar unavailable
warning [Main] file:///home/sperry/workspace/mixxxqt6/res/qml/DeckInfoBar.qml:74:9: MixxxControls.Spinny is not a type
critical [Main] Failed to load QML file "/home/sperry/workspace/mixxxqt6/res/qml/main.qml"

Holzhaus · 2022-01-31T00:00:58Z

When I change it to PUBLIC, it works. target_link_libraries(mixxx-lib PUBLIC mixxx-libplugin)

Now it complains about

warning [Main] QQmlApplicationEngine failed to load component
warning [Main] file:///home/sperry/workspace/mixxxqt6/res/qml/main.qml:104:9: Type Skin.DeckRow unavailable
warning [Main] file:///home/sperry/workspace/mixxxqt6/res/qml/DeckRow.qml:70:5: Type Deck unavailable
warning [Main] file:///home/sperry/workspace/mixxxqt6/res/qml/Deck.qml:38:5: Type Skin.DeckInfoBar unavailable
warning [Main] file:///home/sperry/workspace/mixxxqt6/res/qml/DeckInfoBar.qml:74:9: MixxxControls.Spinny is not a type
critical [Main] Failed to load QML file "/home/sperry/workspace/mixxxqt6/res/qml/main.qml"

Okay, I changed it to public, please retry: https://github.com/mixxxdj/mixxx/compare/88320b2684a89fbedbc149528a4b6dbbc4a7a4c6..f3bfd9e434d656c78fdac4bf1bc572421e77e053

daschuer · 2022-01-31T00:04:57Z

That was already the output with the PUBLIC linking.

Holzhaus · 2022-01-31T00:31:02Z

That was already the output with the PUBLIC linking.

Both modules? I thought you only changed the first one.

daschuer · 2022-01-31T00:36:02Z

Yes, that was for both.

uklotzde

With this patch I could build and run Mixxx on Fedora:

https://src.fedoraproject.org/rpms/qt6-qt5compat/pull-request/1

Update: Merged!

uklotzde · 2022-01-31T15:04:14Z

That was already the output with the PUBLIC linking.

Why do we need PUBLIC linking? Fedora also works fine with PRIVATE linking, just tested it.

I suppose the custom-built and untested Qt 6 libraries cause issues here. We should not introduce any workarounds for a broken environment. Therefore I recommend to undo these changes until we know the actual cause for the failures.

Swiftb0y · 2022-01-31T15:57:20Z

I was able to successfully build on fedora. However I encountered a bunch of runtime issues. Most of which come from the fact that some players don't seem to get created:

warning [Main] PlayerManagerProxy failed to find player for group "[Channel4]"
warning [Main] PlayerManagerProxy failed to find player for group "[Channel3]"
warning [Main] PlayerManagerProxy failed to find player for group "[Sampler5]"

The first few players and samplers work fine, but the "optional" ones don't work.

This commit replaces the legacy way to register C++ QML types with the new "declarative" API using `QML_ELEMENT`/`QML_NAMED_ELEMENT(<name>)` that was first introduced in Qt 5.15 [1]. As of Qt 6.2, this is now the recommended way to set up proper QML modules and also takes care of generating `qmldir`/`qmltypes` files that are necessary when linting QML files using `qmllint` [2]. We now make use of the new CMake functions [3] to take care of this. [1]: https://www.qt.io/blog/qml-type-registration-in-qt-5.15 [2]: https://www.qt.io/blog/qml-modules-in-qt-6.2 [3]: https://doc.qt.io/qt-6/qt-add-qml-module.html

Holzhaus · 2022-01-31T17:08:32Z

We should not introduce any workarounds for a broken environment. Therefore I recommend to undo these changes until we know the actual cause for the failures.

Reverted: https://github.com/mixxxdj/mixxx/compare/f3bfd9e434d656c78fdac4bf1bc572421e77e053..11fd27f2c1e4877a5f7c7452960fdd555ade75c9

Holzhaus · 2022-01-31T17:12:16Z

However I encountered a bunch of runtime issues.

Yes, that issue probably already happend with Qt 5 I guess.

And there are some other problems too, for example the JavaScript import is not working. I opened a Qt upstream bug: https://bugreports.qt.io/browse/QTBUG-100326

I think we can resolve them in follow-up PRs.

uklotzde · 2022-01-31T21:53:54Z

Merge as a first baseline? Everything else could be done later.

Holzhaus · 2022-01-31T22:39:09Z

Yes, I agree.

Holzhaus added the ui label Jan 27, 2022

Holzhaus added this to the 2.4.0 milestone Jan 27, 2022

github-actions bot added build library labels Jan 27, 2022

Holzhaus force-pushed the qml-module branch 2 times, most recently from 9dda616 to 158d60a Compare January 28, 2022 21:04

Holzhaus added 3 commits January 28, 2022 22:48

CI: Update ArchLinux container with Qt 6.2.2

299b9bb

QML: Remove --qml command line flag and make QML Qt6-only

09f9b22

QML: Replace QtGraphicalEffects with Qt5Compat.GraphicalEffects

8bc76eb

Holzhaus force-pushed the qml-module branch from 158d60a to 904c08d Compare January 28, 2022 21:52

ywwg approved these changes Jan 29, 2022

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uklotzde reviewed Jan 29, 2022

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Holzhaus force-pushed the qml-module branch from 904c08d to 876f344 Compare January 29, 2022 23:15

Holzhaus force-pushed the qml-module branch from 876f344 to 88320b2 Compare January 30, 2022 16:39

Holzhaus requested a review from uklotzde January 30, 2022 16:44

daschuer reviewed Jan 30, 2022

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Holzhaus mentioned this pull request Jan 30, 2022

QML: Mark required properties as such #4654

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Holzhaus force-pushed the qml-module branch from 88320b2 to f3bfd9e Compare January 30, 2022 23:59

uklotzde approved these changes Jan 31, 2022

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Holzhaus force-pushed the qml-module branch from f3bfd9e to 11fd27f Compare January 31, 2022 17:08

uklotzde merged commit b648a88 into mixxxdj:main Jan 31, 2022

Make QML UI compatible with Qt 6 #4649

Make QML UI compatible with Qt 6 #4649

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