[solved] c++ equvalent of "property alias"

Katlin

Hi,

What would be the c++ equivalent of "property alias" from qml?

I have a class extending QQuickText in which I create 2 child QQuickText objects like this:
@
class XLabel : public QQuickText
{
Q_OBJECT

public:
QQuickText *probe, *label1, *label2;
void createLabels();
....
}

void XLabel::createLabels(){
label1 = new QQuickText(this);
label2 = new QQuickText(this);
// here the equivalent of property alias ...
}
@

I need to expose these 2 child labels in the main object so they are accessible from QML.
In QML I would do like this:

@
Text{

property alias t1:label1; // <-- how can I do this in c++ ?
property alias t2:label2;  

Text{
    id:label1;
}

Text{
    id:label2;
}

}
@

So how can I do this from c++ ?

sierdzio

I think there is no such mechanism in C++. You need to declare those properties by hand.

Katlin

You mean like we do with all the properties, using Q_PROPERTY ? Would that work on a QQuickText* variable ?

sierdzio

[quote author="Katlin" date="1416997981"]You mean like we do with all the properties, using Q_PROPERTY ? Would that work on a QQuickText* variable ?[/quote]

Yes and yes. QQuickText is still a Q_OBJECT, so all the magic from MOC is available here.

Katlin

I did that. I see that in QML it is not available. If I console.log it, i get undefined.

Katlin

Correction: it works, it was just a typo.
So now, I can address it just as if it would be declared in QML ?

sierdzio

Yes, it should work. Remember the QML engine relies on NOTIFY signal to manage bindings, so you need to have that declared and used in your property functions.

Katlin

Ok, it solved my problem, thx! Now on click I do have access to the sub-labels.
But now there is another problem; may I direct your attention to it: https://qt-project.org/forums/viewthread/50047/ ?

sierdzio

Thanks for the link, but this time I do not know the answer.

Katlin

Oki, again, thank you!