Make it compile against qt6

src/app/core.cpp

@@ -39,7 +39,11 @@ bool Core::initialize()
     }
 
     qRegisterMetaType<Minuet::ISoundController::State>("State");
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     qmlRegisterInterface<Minuet::ISoundController>("ISoundController");
+#else
+    qRegisterMetaType<Minuet::ISoundController>();
+#endif
     qmlRegisterUncreatableType<Minuet::ISoundController>(
         "org.kde.minuet.isoundcontroller", 1, 0, "ISoundController",
         QStringLiteral("ISoundController cannot be instantiated"));

src/app/main.cpp

@@ -39,7 +39,9 @@
 
 int main(int argc, char *argv[])
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+#endif
     QGuiApplication application(argc, argv);
 
 #if !defined(Q_OS_ANDROID)

src/interfaces/icore.h

@@ -23,16 +23,17 @@
 #ifndef MINUET_ICORE_H
 #define MINUET_ICORE_H
 
+#include "iexercisecontroller.h"
+#include "iplugincontroller.h"
+#include "isoundcontroller.h"
+#include "iuicontroller.h"
+
 #include <interfaces/minuetinterfacesexport.h>
 
 #include <QObject>
 
 namespace Minuet
 {
-class IPluginController;
-class ISoundController;
-class IExerciseController;
-class IUiController;
 
 class MINUETINTERFACES_EXPORT ICore : public QObject
 {

src/interfaces/iexercisecontroller.cpp

@@ -28,7 +28,11 @@ namespace Minuet
 {
 IExerciseController::IExerciseController(QObject *parent) : QObject(parent)
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     qmlRegisterInterface<IExerciseController>("IExerciseController");
+#else
+    qRegisterMetaType<IExerciseController>();
+#endif
 }
 
 void IExerciseController::setCurrentExercise(QVariantMap currentExercise)

src/utils/xdgdatadirs.cpp

@@ -13,13 +13,13 @@ QStringList Utils::getXdgDataDirs()
     }
 
     QStringList results;
-    const auto paths = xdgDataDirsEnv.splitRef(QLatin1Char(':'), Qt::SkipEmptyParts);
+    const auto paths = xdgDataDirsEnv.split(QLatin1Char(':'), Qt::SkipEmptyParts);
     // Normalize paths, skip relative paths
     for (const auto &path : paths) {
-        if (!QDir::isAbsolutePath(path.toString()) || !QDir(path.toString()).exists()) {
+        if (!QDir::isAbsolutePath(path) || !QDir(path).exists()) {
             continue;
         }
-        results.append(path.toString());
+        results.append(path);
     }
 
     return results;