ContainerSideInventory.java

package slimeknights.tconstruct.tools.common.inventory;

import net.minecraft.inventory.Slot;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.EnumFacing;
import net.minecraftforge.items.IItemHandler;
import net.minecraftforge.items.SlotItemHandler;

import slimeknights.mantle.inventory.BaseContainer;

public class ContainerSideInventory<T extends TileEntity> extends BaseContainer<T> {

  public final int columns;
  public final int slotCount;

  public ContainerSideInventory(T tile, int x, int y, int columns) {
    this(tile, null, x, y, columns);
  }

  public ContainerSideInventory(T tile, EnumFacing dir, int x, int y, int columns) {
    super(tile, dir);

    this.columns = columns;
    this.slotCount = itemHandler.getSlots();

    int rows = slotCount / columns;
    if(slotCount % columns != 0) {
      rows++;
    }

    int index = 0;
    for(int r = 0; r < rows; r++) {
      for(int c = 0; c < columns; c++) {
        if(index >= slotCount) {
          break;
        }
        this.addSlotToContainer(createSlot(itemHandler, index, x + c * 18, y + r * 18));
        index++;
      }
    }
  }

  protected Slot createSlot(IItemHandler itemHandler, int index, int x, int y) {
    return new SlotItemHandler(itemHandler, index, x, y);
  }

  public int getSlotCount() {
    return slotCount;
  }

  public int getSizeInventory() {
    return itemHandler.getSlots();
  }
}