where is propertyChanged() ?

[wysota]

The signal is for your own plugins so that they can react on changes in properties by implementing slots accepting this signature.

[larry.liu.china]

The signal is for your own plugins so that they can react on changes in properties by implementing slots accepting this signature.

Thanks,wysota!
But the codes i said are the source codes of Qt, not mine. I just want to know how realizes the propertyChanged() for a QWidget in the Qt's source codes, for example the QPushButton.

[wysota]

I don't understand what you mean. QWidget doesn't have such signal. This signal, as I said, is specifically for Qt Designer plugins implementing things such as Designer's property editor extensions. You can't use this signal in regular Qt applications.

[larry.liu.china]

I don't understand what you mean. QWidget doesn't have such signal. This signal, as I said, is specifically for Qt Designer plugins implementing things such as Designer's property editor extensions. You can't use this signal in regular Qt applications.

yeah, you are right.
you know ,when i change a property's value of a Widget in the right of the Qt Creator, the PropertyEditor will emit the perprotyChanged, i just want to know, who has a slot accepting the signal.

[wysota]

I already told you that twice. If you still are not convinced I'm right, grep Qt sources for the signature and see what (if anything) implements a slot with such a signature.

[larry.liu.china]

Anyway,Thanks a lots.
I know! You mean that this signal is just for the Qt Designer plugins.
And if i select a QWidget(for example QPushButton, who belong to Qt, not a plugins) in the UI designer of Qt Creator, and then, i chang a value of the QWidget in its PropertyEditor where is in the lower right corner of the Qt Creator.What's happen now? Who to respond to this change?
Once again, thank you!

[wysota]

Do you really want me to say this for the third time? You can write a Deisgner plugin that will do something when a property of a particular widget changes its value.