[Interest] Setting propery values on Q_GADGET-based objects in qml possible?

[Ola Røer Thorsen]

Hi all,

I have a Q_GADGET-based class with properties that I instantiate in C++ and
expose to qml via QVariant in a list model. The class is registered to Qt
and Qml using Q_DECLARE_METATYPE,
qRegisterMetaType and qmlRegisterUncreatableType.

The properties are defined like this:

class MyGadget {
Q_GADGET
Q_PROPERTY(Type propName MEMBER propName)
public:
Type propName;
... etc
};

In QML I can read the properties just fine.

Now I'd like to take one of these gadget-objects in QML, modify some of
it's properties and then use it as an argument when calling a Q_INVOKABLE
c++ function.

In qml code this looks something like

property var theGadget // with a property .name = "Name"

function doStuff() {
   var o = theGadget;
   console.log("o.name"); // prints "Name"
   o.name = "Some other name";
   console.log("o.name"); // Still prints "Name" instead of "Some other
name"
   backend.setNewGadget(o);
}

Trying to set any of the gadget object's properties does not have any
effect. The value of property "name" here is the same before and after the
assignment. Are Q_GADGET types to be considered read-only in QML, or am I
missing something else to make this work?

This is using Qt 5.9.0.

Best regards,
Ola
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/interest/attachments/20170620/322a1589/attachment.html>