How to add text to QScrollArea while the program is running?

Question

PyQt

I want to create a simple calculator that can only add 2 numbers and save the calculation history in a small widget on the right. The problem is that I did not find how it would be possible to add the result of the calculation and the example itself there immediately, as soon as the user clicks on the calculation button.

I do all this with QtDesigner WITHOUT converting the .ui file to a .py file, but by changing the properties of objects according to the pattern "win.object_name.function" (or something like that).

Here is the code - https://pastebin.com/Xwbtzz4M
Here is the ".ui" file - https://disk.yandex.ru/d/72oYSum_DaLB1g

Answer 1

Add a layout to the widget that will be added to the QScrollArea and feed it new widgets.
QTDesigner will not help much, it will only allow you to draw molds, everything else is in the code.