Click Data
A click handler for a slot: which clicks (Bukkit ClickTypes, e.g. LEFT, RIGHT, MIDDLE, SHIFT_LEFT) trigger it — matched exactly, any one of the set — and the action to run for the clicking player. Register one type via ClickData(ClickType.LEFT) { … }, or several via ClickData(ClickType.LEFT, ClickType.SHIFT_LEFT) { … }.