Drawing on a widget created via QDesigner

**jean** · 13th January 2009, 18:57

I know how to draw a picture on a QMainWindow via QPainter:

QPainter painter(this).

But, after creating a QFrame (named frame_1) via QDesigner, how to implement the paintEvent in order to make it working with my QFrame ?

In short, I would like to point to my QFrame, not the default (this) QMainWindow.

I have not seen any code from Google or from this forum, since QDesigner is not very used.

By advance, thank you for any help.http://www.qtcentre.org/forum/images/icons/icon3.gif

Jean (a novice, of course).

**spirit** · 13th January 2009, 19:10

you can install event filter for your QFrame object and then handle its QPaintEvent.

**jpn** · 13th January 2009, 19:35

Create a QFrame subclass and promote it in designer.

**jean** · 15th January 2009, 11:08

Thanks for these 2 answers.

My knowledge of C++ processes is still poor (I come from Delphi), but I presume that subclassing would be faster than using an eventFilter. Am I right ?

In fact, I tryed both them, without anay results.

I red the <promote> URL pointed by JPN, but I understood that promoting is only when you want to customize a widget. The widget is created within QDesigner (an .ui file) but I don't know of to double inherit a QFram object and an object still created with QDesigner.

Could be more explicit ?
Thank you by advance.
Jean.