扩展 QML - 扩展对象范例

Extension Objects.

此范例构建于:

Shows how to use qmlRegisterExtendedType() to provide an extension object QLineEdit without modifying or subclassing it.

Firstly, the LineEditExtension class is registered with the QML system as an extension of QLineEdit :

    qmlRegisterExtendedType<QLineEdit, LineEditExtension>("People", 1,0, "QLineEdit");
					

The QML engine then instantiates a QLineEdit :

    QQmlEngine engine;
    QQmlComponent component(&engine, QUrl("qrc:example.qml"));
    QLineEdit *edit = qobject_cast<QLineEdit *>(component.create());
					

In QML, a property is set on the line edit that only exists in the LineEditExtension class:

QLineEdit {
    leftMargin: 20
}
					

The extension type performs calls on the QLineEdit that otherwise will not be accessible to the QML engine.

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