[1.12] Custom Inventory Slot?

[Electric]

Hello,

My goal is to create a custom inventory slot, next to the already existing armor slots. I'm not entirely sure how to accomplish this, but I've read some things online about forge capabilities. It seems like the best way to go, except there doesn't seem to be much information on it. Could anyone help get me started? 

[Electric]

On 9/14/2017 at 3:18 PM, diesieben07 said:

For example you do not need a separate interface and implementation class, you can just make a class that extends ItemStackHandler and use that as your capability.

So I'm not sure I completely follow you. I've created a class that extends ItemStackHandler, but I'm not sure what goes in there since I'm not creating an interface class. And since I don't need a capability provider, what would I put in the second parameter of event#addCapability()?

@SubscribeEvent
public void attachCapability(AttachCapabilitiesEvent<Entity> event) {
	if (event.getObject() instanceof EntityPlayer) {
            event.addCapability(INV_SLOT,);
        }
  }