How to use

cofh.core.util.filter.ItemFilterWrapper

constructor

public ContainerSatchelFilter(ItemStack stack, InventoryPlayer inventory) {
  player = inventory.player;
  containerIndex = inventory.currentItem;
  filterWrapper = new ItemFilterWrapper(stack, ItemSatchel.getFilterSize(stack));
  filterIndex = ItemSatchel.getLevel(stack);
  int rows = MathHelper.clamp(filterIndex + 1, 1, 3);
  int slots = ItemSatchel.getFilterSize(stack);
  int rowSize = slots / rows;
  int xOffset = 62 - 9 * rowSize;
  int yOffset = 44 - 9 * rows;
  bindPlayerInventory(inventory);
  for (int i = 0; i < slots; i++) {
    addSlotToContainer(new SlotSatchelFilter(filterWrapper, i, xOffset + i % rowSize * 18, yOffset + i / rowSize * 18));
  }
}

  return false;
ItemFilterWrapper wrapper = new ItemFilterWrapper(stack, getFilterSize(stack));
ItemStack eventItem = event.getItem().getItem();