It’s swing so if you don’t use it you’re probably not interested.
Anyway, this is just a preconfigured horizontal JList with some hacks to make tooltips less painful.
It is somewhat similar to the gnome image list (one example of which appears in the choose background image app), but they are still slightly better in that (intuitively) the left and right arrows transpose the selection to the upper and lower row when at the edges of a line. If you could point me out a way to do that i’d appreciate it.
I would put in the code here but it exceeds 10000 characters (just so you see how much code is required to bend swing into forms that were never meant to be).