I have made a custom GUI and custom slot, but when I try to click on an item that is inside my custom slot it just falls to the ground instead of following my mouse round like in an inventory. Also it only seems to do it at a certain place. In some places nearer the edge of the screen it will just pop out like before but nearer the center it acts normally.

Show your code.

Container Class:

 

public class ContainerCustom extends Container {
protected IInventory i;

private int playerInventoryX = 70;
private int playerInventoryY = 8;

public ContainerCustom(InventoryPlayer inventoryPlayer, IInventory c) {
	i = c; {

		addSlotToContainer(new SlotCustom(c, 0, 144, -55));

	}
	bindPlayerInventory(inventoryPlayer);
}

public boolean canInteractWith(EntityPlayer player) {
	return i.isUseableByPlayer(player);
}

protected void bindPlayerInventory(InventoryPlayer inventoryPlayer) {
	for (int i = 0; i < 3; i++) {
		for (int j = 0; j < 9; j++) {
			addSlotToContainer(new Slot(inventoryPlayer, j + i * 9 + 9, playerInventoryX + j * 18, playerInventoryY + i * 18));
		}
	}
	for (int i = 0; i < 9; i++) {
		addSlotToContainer(new Slot(inventoryPlayer, i, playerInventoryX + i * 18, playerInventoryY + 54 + 4));
	}
}

@Override
public ItemStack transferStackInSlot(EntityPlayer par1EntityPlayer, int par2) {
	return null;
}

@Override
public void onContainerClosed(EntityPlayer par1EntityPlayer) {
	super.onContainerClosed(par1EntityPlayer);
	this.i.closeInventory();
}
}

 

Slot Class:

 

public class SlotCustom extends Slot {

public SlotCustom(IInventory inventory, int par2, int par3, int par4) {
	super(inventory, par2, par3, par4);
}

@Override
public boolean isItemValid(ItemStack itemstack) {
	return itemstack.getItem() == Items.arrow;
}

@Override
public int getSlotStackLimit() {
	return 1;
}

}

 

Set your gui's width and height in constructor ( this.xSize, this.ySize)

Ahh okay, I am doing so now.

Worked I believe, thank you.