Drag and Drop QTableWidget in UI file.

[Cruz]

This is a great way to click your gui together with Designer and still be able to add functionality, such as drag and drop. Now the question is, how to add a layout as well?

I used the same approach and created a QFrame in Designer which I then promoted to MyFrame. MyFrame is able to handle drop events. The dropped objects should be layed out nicely though, so I hoped I can take care of the layout in Designer too. I added a horizontal layout in Designer to the QFrame, promoted it to MyFrame and started the application. I dragged something on the frame and boom, the application crashed. Investigations show that myFrame->layout() returns NULL. The layout has been canceled. It doesn't matter if I first promote and then add the layout either.

Any ideas how to accomplish this?

[tpf80]

The widget you place in designer that is promoted is only a placeholder for the actual custom widget.

What you might need to do is add the layout as part of your custom widget's code, and not in designer, so that when your widget replaces the placeholder it will already have the layout in it.