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Diffstat (limited to 'src/qml/doc/src/cmake/qt_generate_foreign_qml_types.qdoc')
-rw-r--r-- | src/qml/doc/src/cmake/qt_generate_foreign_qml_types.qdoc | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/qml/doc/src/cmake/qt_generate_foreign_qml_types.qdoc b/src/qml/doc/src/cmake/qt_generate_foreign_qml_types.qdoc new file mode 100644 index 0000000000..22d72c101b --- /dev/null +++ b/src/qml/doc/src/cmake/qt_generate_foreign_qml_types.qdoc @@ -0,0 +1,77 @@ +// Copyright (C) 2021 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only + +/*! +\page qt-generate-foreign-qml-types.html +\ingroup cmake-commands-qtqml + +\title qt_generate_foreign_qml_types +\target qt6_generate_foreign_qml_types + +\summary{Registers types from one target in a QML module.} + +\include cmake-find-package-qml.qdocinc + +\section1 Synopsis + +\badcode +qt_generate_foreign_qml_types( + source_target + destination_qml_target +) + +\endcode + +\versionlessCMakeCommandsNote qt6_generate_foreign_qml_types() + +\section1 Description + +\c qt_generate_foreign_qml_types extracts types marked via QML registration +macros (like \l QML_ELEMENT) from \c source_target and registers them as foreign +types in the QML module \c destination_qml_target. + +This can be useful when one wants to create a library with optional QML integration, without +depending directly on QML. + +\badcode +// myclass.h +#include <QtQmlIntegration/qqmlintegration.h> + +class MyClass : public QObject +{ + QML_ELEMENT + Q_OBJECT + + // [...] +}; +\endcode + +\badcode +# CMakeLists.txt +qt_add_library(mylib myclass.h ...) +target_link_libraries(mylib PRIVATE Qt::Core Qt::QmlIntegration) + +qt_add_qml_module(mylib_declarative + VERSION 1.0 + URI "mylib" + ... +) +qt_generate_foreign_qml_types(mylib mylib_declarative) +\endcode + +\note In the example above, \c mylib does not depend on QtQml or QtQuick, but only on the +header-only QmlIntegration target (for the QtQmlIntegration/qqmlintegration.h header, which provides +the \c QML_ELEMENT macro). + +The effect is equivalent to using \c QML_FOREIGN with custom structs in the QML library to expose +the types. + +\note In order to implement custom behavior, such as exposing an existing +singleton instance with its own life cycle to QML, you should add custom types +to your QML library (mylib_declarative in the above example). In turn, you +should omit the \l QML_ELEMENT and similar macros from the original C++ classes +so that qt_generate_foreign_qml_types() does not generate more QML integration +structs for them. The QML macros, as well as any singleton factory functions, +can be added to the structs that contain the \l QML_FOREIGN. + +*/ |