QQmlPropertyMap Class

Detailed Description

QQmlPropertyMap provides a convenient way to expose domain data to the UI layer. The following example shows how you might declare data in C++ and then access it in QML.

In the C++ file:

 // create our data
 QQmlPropertyMap ownerData;
 ownerData.insert("name", QVariant(QString("John Smith")));
 ownerData.insert("phone", QVariant(QString("555-5555")));

 // expose it to the UI layer
 QQuickView view;
 QQmlContext *ctxt = view.rootContext();
 ctxt->setContextProperty("owner", &ownerData);

 view.setSource(QUrl::fromLocalFile("main.qml"));
 view.show();

Then, in main.qml:

 Text { text: owner.name + " " + owner.phone }

The binding is dynamic - whenever a key's value is updated, anything bound to that key will be updated as well.

To detect value changes made in the UI layer you can connect to the valueChanged() signal. However, note that valueChanged() is NOT emitted when changes are made by calling insert() or clear() - it is only emitted when a value is updated from QML.