Evaluate QQuickItem's width and height

[MartinD]

I create a QML component from C++:

QQmlComponent *component = new QQmlComponent(m_engine,
                                QUrl(QStringLiteral("qrc:/my.qml")));
 QQuickItem *my = qobject_cast<QQuickItem*>(component->create());
  delete component;
  my->setParent(parent);
  my->setParentItem(parent);
  QQmlEngine::setObjectOwnership(ball, QQmlEngine::CppOwnership);

If I check my's width and heigh imediatelly after above code is executed (I print them with qDebug()), I get zeros, even width and height is set relatively to parent:

// my.qml
Item {
    width: parent.width
    height: parent.height
}

How to force QML engine to evaluate width and height or where can one be sure width and heigh has been evaluated?

[A Former User]

Hi!
This should work:

• Add a "ready()" signal to the root item of your qml file
• In that qml file, add component.onCompleted: ready()
• In C++ add some slot that shall be called once your QtQuick item is completed and connect said signal to this slot.

Another, simpler way: In C++, after you load the qml, loop until the item says it's complete (using bool QQuickItem::isComponentComplete() const).