How can I hide a top-level widget in Qt, but still show a nested (lower-level) widget?

Question

Qt

As a training example (according to the tutorial), I made up the widget shown in the picture:

How to make it so that when this widget is displayed, only the data entry form with rounded edges is shown?

Answer 1

From the looks of it, it wouldn't hurt to add a layout to stretch your child widget inside the parent widget.
In the constructor of the parent widget, you can add:
setAttribute(Qt::WA_TranslucentBackground);
Should help.

Answer 2

xseven, thanks for the advice =) The widget is already stretched with the layout inside the parent one, just a large margin is set. In order for everything to work perfectly, you need to add the following in addition to your line:

setAttribute(Qt::WA_TranslucentBackground);
setWindowFlags(Qt::FramelessWindowHint);

And after that everything works great.