[Qt-creator] Drawing on QWidget

[Alex Williams]

Hello!
I have Qt Creator 1.2
I placed QWidget to form in deisgner. It scaled by layouts.

Then, I have QPixmap. I drawing into QPixmap when pressing on button.

Now I want just draw contents of pixmap into QWidget surface right
when I pressing button.

1) how to copy QPixmap to QWidget on button click
2) if (1) is not possible, how to override paintEvent of QWidget
created by designer? I cant find any way to do that

And again: just draw QPixmap to any widget...

Since my search on internet, I found that this is a mega huge problem
of Qt, many many programmers can't find answer on this simple
question... All exmaples is applied to self coded wisgets, but not
created by designer, so any examples with paintEvent is not
applicable... I spent 4 days on this problem!..