Extending QML - Extension Objects Example¶
This example builds on:
Shows how to use
QML_EXTENDED to provide an extension object to a
QLineEdit without modifying or subclassing it.
Firstly, the LineEditExtension class is registered with the QML system as an extension of
QLineEdit . We declare a foreign type to do this as we cannot modify Qt’s internal
<Code snippet "referenceexamples/extended/lineedit.h:0" not found>
Note the usage of
QML_NAMED_ELEMENT() instead of
QML_ELEMENT uses the name of the containing type by default, “LineEditExtension” in this case. As the class being an extension class is an implementation detail, we choose the more natural name “LineEdit” instead
The QML engine then instantiates a
<Code snippet "referenceexamples/extended/main.cpp:1" not found>
In QML, a property is set on the line edit that only exists in the LineEditExtension class:
<Code snippet "referenceexamples/extended/example.qml:0" not found>
The extension type performs calls on the
QLineEdit that otherwise will not be accessible to the QML engine.
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