The first comment is: > I strongly recommend you don't implement your own GUI library, even as a hobby project. It's extremely hard to get right, and there are

The first comment is: > I strongly recommend you don't implement your own GUI library, even as a hobby project. It's extremely hard to get right, and there are a lot of details, and it's easy to get wrong. The questioner thankfully ignored this discouragement. The top and only answer is provided by the questioner, 3 years after the question was asked, and includes their own master's thesis answering the question!