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-.. _qml-extension-objects-example:
-
-Extending QML - Extension Objects Example
-=========================================
-
-This example builds on the the :ref:`qml-adding-types-example`.
-
-Shows how to use QmlExtended decorator 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 QLineEdit class.
-
-.. code-block:: python
-
- @QmlNamedElement("QLineEdit")
- @QmlExtended(LineEditExtension)
- @QmlForeign(QLineEdit)
- class LineEditForeign(QObject):
-
-
-Note the usage of ``QmlNamedElement()`` instead of ``QmlElement()``.
-``QmlElement()`` 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 ``QLineEdit``
-instead.
-
-The QML engine then instantiates a QLineEdit.
-
-In QML, a property is set on the line edit that only exists in the
-``LineEditExtension`` class:
-
-.. code-block:: javascript
-
- QLineEdit {
- left_margin: 20
- }
-
-The extension type performs calls on the ``QLineEdit`` that otherwise will not
-be accessible to the QML engine.