Hello. I am a bit new in modding, but i know java a bit. So i want to make custom gui, not container gui, achievment gui and etc.
In my far plans i want to make gui of map: there 'll be a frame and around 3200x3200 map which i can drag because it is too large.
Well, i looked for idea in vanilla sources. I noticed that achievments gui or container gui extends from Screen and some elements like buttons extends from Widget. So i went to Screen class and... most part of variables and methods have names like field_230701_a_ or field_230703_c_ and because of it understanding the code of this class is hard.
As for forge documentation https://mcforge.readthedocs.io/en/1.15.x/ i haven't found anything about Screen class.