Build System Integration

The Qt Interface Framework Generator is fully integrated in qmake and CMake to generate all or part of a project.

In it's simplest form, qmake/CMake can generate all the source code and the project only needs to configure the type of project to build.

For complex setups, you can combine generated code with application specific code to extend and use the generated code.

QMake

Example:

CONFIG += ifcodegen

QT_FOR_CONFIG += interfaceframework
!qtConfig(ifcodegen): error("No ifcodegen available")

IFCODEGEN_TEMPLATE = frontend
IFCODEGEN_SOURCES = example.qface
IFCODEGEN_MODULE_NAME = myModule
IFCODEGEN_OUTPUT_DIR = myOutputDir
IFCODEGEN_ANNOTATIONS = annotation.yaml

The following qmake variables are available:

For more details on the generator's command line arguments, see Use the Generator.

Note: Since the ifcodegen has specific system dependencies, it may not be available in all QtInterfaceFramework installations. In this case, the ifcodegen qmake feature is also not available and this can result in build errors.

In this case, use the following code snippet that makes sure the build stops and provides a meaningful error message:

QT_FOR_CONFIG += interfaceframework
!qtConfig(ifcodegen): error("No ifcodegen available")

CMake

In CMake the following functions and variables are provided by the QtInterfaceFramework package.

Variables

Commands

QtModule Support

CMake

The integration also supports generating code that you can subsequently compile into a Qt module. The following shows how you can use CMake to build a module named MyModule:

qt_ifcodegen_generate(
    IDL_FILES mymodule.qface
    TEMPLATE frontend
    MODULE_NAME QtMyModule
)
qt_internal_add_module(MyModule
    LIBRARIES
        Qt::CorePrivate
        Qt::InterfaceFrameworkPrivate
    PUBLIC_LIBRARIES
        Qt::Core
        Qt::InterfaceFramework
    PRIVATE_MODULE_INTERFACE
        Qt::CorePrivate
        Qt::InterfaceFrameworkPrivate
)
qt_ifcodegen_extend_target(MyModule
    NO_GENERATE
    IDL_FILES mymodule.qface
)

Before defining the module, the code needs to be generated as it has to be available for syncqt at this point. Afterwards the generated code is used to extend the module target.

SyncQt

In addition to the project file for the module library, the sync.profile also needs to be changed, as it's used to call the syncqt.pl script that generates the forwarding headers. Usually, the sync.profile is setup to search for these headers in the source folders. Using $out_basedir, you can also extend the script to search in the build folder.

...
%modules = ( # path to module name map
    "QtMyModule" => "$basedir/src/mymodule;$out_basedir/src/mymodule"
);
...

QML Type Registration

Depending on the build system used and the version of the QtInterfaceFramework module, there are several ways for generating QML plugins and registering the QML types.

CMake

The preferred way in CMake is to use the new QML Type registration system, which is available in the QtInterfaceFramework module from version 6.3 onwards. In that version the generated code is already using the new registration macros and provides all the necessary information for CMake to generate the rest:

qt_ifcodegen_extend_target(MyModule
    NO_GENERATE
    PREFIX MYMODULE
    IDL_FILES mymodule.qface
)

qt_add_qml_module(MyModule
    URI ${MYMODULE_URI}
    VERSION ${MYMODULE_VERSION}
    RESOURCE_PREFIX "/"
    CLASS_NAME QtMyModulePlugin
    PLUGIN_TARGET qtmymoduleplugin
    IMPORTS QtInterfaceFramework
)

By using the PREFIX argument in the qt_ifcodegen_extend_target call, additional variables get exposed to using MYMODULE as their prefix. Those variables can be used in the following call to qt_add_qml_module, which handles the QML type registration for all types and also generates a QML plugin.

Before 6.3

Instead of using the new QML Type registration, ifcodegen can be used to generate a QML plugin, which registers all types when loaded:

qt_ifcodegen_import_variables(MYMODULE
    IDL_FILES mymodule.qface
    TEMPLATE qmlplugin
    MODULE_NAME QtMyModule
)

qt_add_qml_module(qtmymoduleplugin
    URI ${MYMODULE_URI}
    VERSION ${MYMODULE_VERSION}
    RESOURCE_PREFIX "/"
    PLUGIN_TARGET qtmymoduleplugin
    NO_PLUGIN_OPTIONAL
    NO_GENERATE_PLUGIN_SOURCE
    NO_GENERATE_QMLTYPES
    NO_GENERATE_QMLDIR
    SOURCES
        ${MYMODULE_SOURCES}
    PUBLIC_LIBRARIES
        Qt::InterfaceFramework
        Qt::MyModule
)