Qt: how to attach a popup window to a component?

Question

Qt

I want to attach a hint to the search string, what search queries are possible - in the manner of a ComboBox. And, of course, move the tooltip if the line has moved - the main window has moved, the main window has changed size, some separator has been dragged ...
There is a complex hierarchy from the form to the search box, and somehow I don’t want to attach installEventFilter to each of these windows along the hierarchy.

Answer 1

Since these comrades have not been able to do the right thing, they have to act in a special way for each case.