Quote Originally Posted by hansmbakker
arrange the widgets, spacers and layouts in Designer and then code it manually in a text editor.
Well, then you did something wrong, because the code from your class certainly didn't look like copied from Designer. You made some widget and you didn't even put it into a layout (which was why your widget was not visible on the form and not positioned like it should).

How can I easily create plugins with designer, then?
You make a .ui file, compile it with uic, and then?
And then subclass it and write all the necessary code, like for any other widget. I don't see a difference between a regular widget and a widget put into a plugin.

You have to create the signals and slots , a plugin interface etc and I believe doing that with a texxt editor is the only way.
Well... it is not the only way, but even so, it doesn't mean you can't use Designer to design your widgets.