Broadly, there are two paradigms of interfacing with a UI library to create a Graphical User Interface (GUI) - Retained-Mode (RM) and Immediate-Mode (IM). This talk is for anyone who wants to understand how to make an immediate-mode GUI from scratch. I will explain the inner workings of an immediate-mode UI library and show one possible way to implement simple widgets like buttons, sliders, and text-boxes from scratch.

Link: https://github.com/Sid-Bhatia-0/SimpleIMGUI.jl