Make a widget resizable by user - does it exist in Qt?

I need to make user possible to resize a Label or PlainTextEdit object. I mean the thing like in Qt Creator. If you select your widget some squares appear on it's corner and on halves of the edges. If you move a square you can resize your object. I need to make the exact same thing inside a Qt window. Is it possible to make it faster rather than just drawing all squares with code and catching the moment when user grabs a square and moves it?
I'm wondering since Qt is written in Qt... Maybe there is an easy option.

AFAIK, it isn't. You need to do everything yourself. Sorry. The QWidget class offers all needed tools for it (except drawing the squares).

Well, thanks. It doesn't seem like a really hard task so I think it's fine.
I just wanted to know since it's used in QtCreator, it was reasonable to think that some part of it might have been put in Qt tools.