Dynamic object's method.

[yeye_olive]

In the slot connected to textChanged() that I mentioned in my previous post, call toPlainText().isEmpty() on your QPlainTextEdit to know whether its text is empty, then setEnabled() on the button as needed.

[kalwi]

But to do that I need an additional method and two pointers to QPlainTextEdit and QPushButton, because I create a QDialog in the method of the main form, right? Otherwise can not be?

[anda_skoa]

Indeed.

In any case, creating a form that way is not very common, best practise is to create a subclass of, in this case QDialog, and encapsulate all its internals into that class.

That way the user of the dialog/form only deals with the class' public API, independent on how it is actually implemented internally.

Cheers,
_

[kalwi]

Ok, thanks.