HOWTO simply refer to a QML item and then work with it?

Salvation a simple question:

I have a QML layout and now want to access via c ++ to the Button, TextField oder Label e.g.

I have the following code:

HelloCascadesApp::HelloCascadesApp()
{
    QmlDocument *qml = QmlDocument::create("hellocascades.qml");
    qml->setContextProperty("cs", this);

    AbstractPane *root = qml->createRootNode();
    Application::setScene(root);
}

is there something like in Android devleopment findViewById?

If it was all the app was going to do, then you wouldn't be even not bother with C++ without doubt, given that it could be done entirely in the QML with Javascript. I'll assume that you already knew and that is just one example of what could be a greater application.

Although it is technically possible to do what you describe, I don't think that's how we're supposed to use QML.  You would rather the button to emit a Signal when it has been activated and, after you link to a location in C++ code, you would do the calculations, then probably update a property in the C++ class.  Label text would have been bound to the property at startup, then it would update automatically after you change the value of the property.

See the examples and background here http://qt-project.org/doc/qt-4.8/qtbinding.html and here http://qt-project.org/doc/qt-4.8/properties.html .

Tags: BlackBerry Developers

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