Scrollable UI

dev.anvilcraft.lib.v2.util.Scrollable is an abstract class for implementing scrollable UI lists.

Core methods:

• calculateRowCount() – calculates the number of scrollable rows based on size() / column()
• getRowIndex() – the row index corresponding to the current scroll position
• scrollOnDrag(barHeight, mouseY, top, bottom) – updates the position when dragging the scroll bar
• scrollOnScroll(scrollY) – mouse wheel input
• reset() – scrolls back to the top
• canScroll() – whether there is enough content to require scrolling

Abstract methods that must be implemented:

• row() – number of visible rows
• column() – number of columns per row
• size() – total number of elements
• setHead(int head) – sets the starting index of the currently visible items (updates list data based on scroll position)