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Diffstat (limited to 'src/qml/doc/src/cppintegration/data.qdoc')
| -rw-r--r-- | src/qml/doc/src/cppintegration/data.qdoc | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/qml/doc/src/cppintegration/data.qdoc b/src/qml/doc/src/cppintegration/data.qdoc index 6bf7dbfb8f..7c2693508c 100644 --- a/src/qml/doc/src/cppintegration/data.qdoc +++ b/src/qml/doc/src/cppintegration/data.qdoc @@ -386,6 +386,14 @@ properties: Q_DECLARE_METATYPE(Actor) \endcode +The usual pattern is to use a gadget class as the type of a property, or to +emit a gadget as a signal argument. In such cases, the gadget instance is +passed by value between C++ and QML (because it's a value type). If QML code +changes a property of a gadget property, the entire gadget is re-created and +passed back to the C++ property setter. In Qt 5, gadget types cannot be +instantiated by direct declaration in QML. In contrast, a QObject instance can +be declared; and QObject instances are always passed by pointer from C++ to QML. + \section1 Enumeration Types To use a custom enumeration as a data type, its class must be registered and |