How to implement the display of prompts in qt when entering text, as in code editors?

Question

Programming

I work in Qt. Can you please tell me how to implement the tooltip function, as in code editors:

What kind of element is it that appears with a list of suitable keywords? And how can it then be positioned relative to the current cursor?

Answer 1

The listbox element and a simple text next to it
Application on widgets or on QML?
Pure QML UI example: