QML Loader Object

[cokefish]

We always us QML to make application having a beautiful GUI, and can be controlled by mouse on the elements on it.

But this time I have got a problem.
I make a application with two windows, one is a QML window, and the other is a common dialog window.
The QML window is not controlled directly by mouse, but rather by the dialog window.

The QML window have many pages, When I want the page content to be changed, I use a "Loader" in QML item to load some other qml file to screen.

Then it is the problem.
If I want to control the elements on some other qml, for example Text, or Image object.
I cannot access them in cpp file.

Would you please give me some method on my problem?
I cost one day on this, but I did not have any solution.
Thank you.

[sierdzio]

In QML, subobjects of the file loaded by Loader are accessible through the "item" property. Does it not work with C++, or you have not tried?

[cokefish]

But I need to use it in cpp file.

“item” property
In cpp file, how I can use it?
I think it is just a property.
If I can change it into a object pointer by type cast?
like below
#-----------------------------
QGraphicsObject *subobject =
qobject_cast<QGraphicsObject *>(v->rootObject()->findChild<QObject *>("mainloader")->property("item"));
#-----------------------------

[cokefish]

And what is more,
the sentences
#--------------------------
(v->rootObject()->findChild<QObject >(“mainloader”)->property(“item”))
#--------------------------
returns a QVariant(QGraphicsObject, ) value.
But I cannot convert it to a QGraphicsObject* pointer.

[dmcr]

a property in accessible in QML coul be of multiple kind int, string, .... see "here":http://doc.qt.nokia.com/4.7-snapshot/qdeclarativebasictypes.html.

But in C++you had to create some code like"int this documentation.":http://doc.qt.nokia.com/4.7-snapshot/qml-extending.html#object-and-list-property-types

[sierdzio]

Please wrap your code in '@' tags.

Try this:
@
(v->rootObject()->findChild<QObject *>(“mainloader”)->property(“item”)).value<QGraphicsObject>();
@

[cokefish]

@ (v->rootObject()->findChild<QObject *>(“mainloader”)->property(“item”)).value<QGraphicsObject>();@

This may not work.
I tried similar method today.

I will confirm it again tomorrow.