@EventHandler
public Message onWindowOpen(WindowOpenEvent event) {
if (event.getWindow() instanceof DefaultWindow) {
return null; // no message for the default Window
}
PlayerInventory inventory = event.getWindow().getPlayerInventory();
int size =
event.getWindow().getSize() - (inventory.getMain().size() + inventory.getQuickbar().size());
return new WindowOpenMessage(event.getWindow(), size);
}
