Is there a way to know when an object's objectName() changes?

[JPNaude]

Hi

Is there a way to know when setObjectName() is called on an object? I couldn't find a signal or event related to this. Thus, is there a clever way to know this?

Thanks,
Jaco

[wysota]

As far as I remember there is an internal event that gets posted to the widget but it's not in the API. But I'm not sure if I'm right - you'd have to check in the sources of QObject.

[nimaweb]

Why don't you subclass and implement the method yourself? Then you can emit a signal when it's called.

[wysota]

Why don't you subclass and implement the method yourself

Because QObject::setObjectName() is not virtual.

[JPNaude]

Thanks for the responses. Apart from the fact that setObjectName() is not virtual, I want to be able to monitor any QObject based class, thus a subclass wouldn't have done the job even if it was virtual.

I have not had time to look at the sources yet, but will do so.

Thanks for the help.
Jaco

[burnttoy]

Hiya, I just looked at the sources for 4.5.2 and I'm afraid I can't find any emitted signal. The code for QObject::setObjectName is simply...

void QObject::setObjectName(const QString &name)
{
    Q_D(QObject);
    d->objectName = name;
}

void QObject::setObjectName(const QString &name)
{
    Q_D(QObject);
    d->objectName = name;
}

To copy to clipboard, switch view to plain text mode 

No internal event, no signal. Ho hum. I'm afraid I've got no solutions for you beyond adding this feature to Qt yourself. This is quite do-able but you'll be stuck with a version of Qt source differing from the release versions which could prove to be a maintenance problem for you. If this is just for debugging then you'll probably get away with it.

[JPNaude]

Hi

Thanks for checking it, I didn't get to it yet.

I'll have to make another plan then, I really need this. I'll perhaps use my own dynamic property then since there is a signal which is emitted when dynamic properties change.

Thanks again,
Cheers