I added a villager, and when that villager is right clicked it should open a custom gui instead of the villager trading gui. I got as far as using AT to get the IMerchant value and now I know when its the villager I added.

But the event is uncancelable and if I open my GUI first then the container of the tradegui will just open after it. Is there a way I can do this?

 

I have already looked into GuiOpenEvent but that way I cannot get the container. If I grab either container variable from the player its a ContainerPlayer which is the inventory.

 

Code:

    @SubscribeEvent
    public static void onOpenVillagerGUI(PlayerContainerEvent.Open event){
        if(event.getContainer() instanceof ContainerMerchant){
            ContainerMerchant merchantContainer = (ContainerMerchant) event.getContainer();
            InventoryMerchant merchant = merchantContainer.getMerchantInventory();
            if(!(merchant.merchant instanceof EntityVillager)){
                return;
            }

            EntityVillager villager = (EntityVillager) merchant.merchant;

            if(villager.getProfessionForge().getRegistryName().toString()
                    .equalsIgnoreCase(ModVillage.OLD_PRIEST_PROFESSION.getRegistryName().toString())){

                Minecraft.getMinecraft().player.openGui(Solar.instance, GuiHandler.GUIDE_BOOK_ID_GUI, event.getEntityPlayer().getEntityWorld(), 0, 0, 0);
            }

        }
    }

 

How would I stop the opening, or close it and then open my own GUI?

I think the gui open event should work. The gui that is passed in can be tested to see if it is a GuiMerchant and if so then you should be able to cast it as GuiMerchant and then get the container since the inventorySlots field is public.