Hi guys, I have a TileEntity with only 1 slot and it can contain only 1 item, but those item's max stack size is 4 and when I try to shift-click it transfer all stack. I tried to use overrided mergeItemStack function, but minecraft chrashes. In the console lot of this 2 strings:

2013-08-28 23:40:26 [iNFO] [sTDOUT] 	at net.minecraft.inventory.Container.retrySlotClick(Container.java:520)
2013-08-28 23:40:26 [iNFO] [sTDOUT] 	at net.minecraft.inventory.Container.slotClick(Container.java:291)

[spoiler=mergeItemStack]

@Override
    public boolean mergeItemStack(ItemStack stack, int begin, int end, boolean backwards)
{
	System.out.println("enter");
	int i = backwards ? end-1 : begin, increment = backwards ? -1 : 1;
	boolean flag = false;
	while(stack.stackSize > 0 && i >= begin && i < end)
	{
		System.out.println(i);
		Slot slot = this.getSlot(i);
		ItemStack slotStack = slot.getStack();
		int slotStacklimit = i < te.getSizeInventory() ? te.getInventoryStackLimit() : 64;
		int totalLimit = slotStacklimit < stack.getMaxStackSize() ? slotStacklimit : stack.getMaxStackSize();
		System.out.println("Slot Stack Limit: " + slotStacklimit);
		System.out.println("Total limit: " + totalLimit);
		if(slotStack == null)
		{
			System.out.println("Empty Stack");
			int transfer = totalLimit < stack.stackSize ? totalLimit : stack.stackSize;
			ItemStack stackToPut = stack.copy();
			stackToPut.stackSize = transfer;
			slot.putStack(stackToPut);
			slot.onSlotChanged();
			stack.stackSize -= transfer;
			flag = true;
        }
        else if(slotStack.itemID == stack.itemID && (!stack.getHasSubtypes() || stack.getItemDamage() == slotStack.getItemDamage()) && ItemStack.areItemStackTagsEqual(stack, slotStack))
        {
        	System.out.println("Add to stack");
        	int maxTransfer = totalLimit - slotStack.stackSize;
        	int transfer = maxTransfer > stack.stackSize ? stack.stackSize : maxTransfer;
        	slotStack.stackSize += transfer;
        	slot.onSlotChanged();
        	stack.stackSize -= transfer;
        	flag = true;
        }
        i += increment;
	}
	System.out.println("exit");
	return flag;
    }

 

[spoiler=transferStackInSlot]

@Override
public ItemStack transferStackInSlot(EntityPlayer player, int slotID)
{
	ItemStack itemstack = null;
	Slot slot = (Slot)this.inventorySlots.get(slotID);
	if (slot != null && slot.getHasStack())
	{
		ItemStack itemstack1 = slot.getStack();
		itemstack = itemstack1.copy();
		if (slotID < NumVars.CMFTEslotsCount)
		{
			if (!this.mergeItemStack(itemstack1, NumVars.CMFTEslotsCount, this.inventorySlots.size(), true))
				return null;
		}
		else
		{
			if (itemstack1.getItem() instanceof AnimusSpall)
			{
				if (!this.mergeItemStack(itemstack1, 0, NumVars.CMFTEslotsCount, false))
					return null;
			}
			else
				return null;
		}
		if (itemstack1.stackSize == 0)
			slot.putStack((ItemStack)null);
		else
			slot.onSlotChanged();
	}
	return itemstack;
}

 

Did you ever figure this out?

I am trying to do the same thing with Forge Gradle in 1.7.2