[Qt-qml] Using C++ classes in signals on the QML side

[Ademar de Souza Reis Jr.]

Hi there.

Is there a way to use an exported C++ class as a parameter in a
signal sent to QML?

Following the code from examples/declarative/extending/signal/, this is what I wan to do:

["Boy" is a C++ class exported to QML]

birthdayparty.h:
 signals:
      void partyStarted(const QTime &time);
+    void newGuestString(const QString &str); // works
+    void newGuestBoy(const Boy &guest); // doesn't

example.qml:
 BirthdayParty {
     onPartyStarted: console.log("This party started rockin' at " + time);
+    onNewGuestBoy: console.log("There's a new guest (boy): " + guest.name); // doesn't work
+    onNewGuestString: console.log("There's a new guest (string): " + str); // works

(simplified diff, you get the idea)

This is the output when the three signals are emitted from the C++ code:

"""
This party started rockin' at 18:16:16
QMetaProperty::read: Unable to handle unregistered datatype 'Person' for property 'QDeclarativeBoundSignalParameters::guest'
file::example.qml:7: TypeError: Result of expression 'guest' [undefined] is not an object.
There's a new guest (string): foobar
"""

So as you can see using QTime and QString works, but using Boy doesn't. Any ideas?

Thanks,
 - Ademar

-- 
Ademar de Souza Reis Jr. <ademar.reis at openbossa.org>
OpenBossa Labs - Instituto Nokia de Tecnologia (INdT)
http://www.openbossa.org/
http://www.indt.org.br/

^[:wq!