Qt module not installed in QtDesigner

[mr.jo]

@Diracsbracket me too bro, but im curious with that warning, im using designer just want to know how my app looks like, without waiting for compilation. :D because the more complex the application is the longer the compilation.

[Diracsbracket]

@mr.jo
Sure.

[mr.jo]

@Diracsbracket thank bro for your infomation. :D

[Seongnam Jee]

int main(int argc, char *argv[])
{
    // Qt Charts uses Qt Graphics View Framework for drawing, therefore QApplication must be used.
    QApplication app(argc, argv);

    QQuickView viewer;

    // The following are needed to make examples run without having to install the module
    // in desktop environments.
#ifdef Q_OS_WIN
    QString extraImportPath(QStringLiteral("%1/../../../../%2"));
#else
    QString extraImportPath(QStringLiteral("%1/../../../%2"));
#endif
    viewer.engine()->addImportPath(extraImportPath.arg(QGuiApplication::applicationDirPath(),
                                      QString::fromLatin1("qml")));
    //***** [Solve] FORCE THE MODULE TO BE IMPORTED.
    QObject::connect(viewer.engine(), &QQmlEngine::quit, &viewer, &QWindow::close);
    
    qDebug() << viewer.engine()->importPathList();

    viewer.setTitle(QStringLiteral("QML Axes"));
    viewer.setSource(QUrl("qrc:/qml/qmlaxes/main.qml"));
    viewer.setResizeMode(QQuickView::SizeRootObjectToView);
    viewer.show();

    return app.exec();
}

[Output through qDebug()]
("/home/snjee/workspace_qt/maxelecPrjs/build-maxCoffeeTdsMeterApp-Desktop_Qt_5_15_2_GCC_64bit-Debug", "qrc:/qt-project.org/imports", "/opt/Qt/5.15.2/gcc_64/qml")

You can find the answer in the built-in "QML Axes" example source.

[Seongnam Jee]

"... is not installed"
"found not working imports...."
I have now found the correct solution.
All problems were solved.
=> Solutions : https://stackoverflow.com/questions/22320541/import-qtquick-controls-2-1-qml-module-not-found