ilan321 Posted March 30, 2015 Share Posted March 30, 2015 Hello! I am rewriting my Transmutation mod, and I still cannot figure out how to leave an item in the craftMatrix. According to this post, I am supposed to call matrix.setInventorySlotContents(int i, ItemStack k) , but when I do so, the item does not stay in the crafting grid! My event subscription method is as follows: public class CraftingHandler { @SubscribeEvent public void ItemCraftedEvent(PlayerEvent.ItemCraftedEvent e) { Transmutation.logger.info("Attempting to craft"); for (int i = 0; i < e.craftMatrix.getSizeInventory(); i++) { if (e.craftMatrix.getStackInSlot(i) == null) continue; if (e.craftMatrix.getStackInSlot(i).getItem() == Recipes.tStone) { Transmutation.logger.info("Crafting with a transmutation stone"); ItemStack stone = e.craftMatrix.getStackInSlot(i); if (!stone.hasTagCompound()) return; // debug stone Transmutation.logger.info("Crafting complete"); stone.getTagCompound().setInteger("uses", stone.getTagCompound().getInteger("uses")-1); if (stone.getTagCompound().getInteger("uses") < 1) stone = new ItemStack(Blocks.air); else { Transmutation.logger.info("Attempting to leave the itemstack in the matrix.."); e.craftMatrix.setInventorySlotContents(i, stone); } return; } } } } As you can see, I am calling e.craftMatrix.setInventorySlotContents(i, stone); but the item does not stay in the crafting grid. How can I fix this? On a side note, is there a way to "remove" an itemstack from the crafting grid? I don't know if setting it to an air block is something that's good or not. Quote Link to comment Share on other sites More sharing options...
ilan321 Posted March 31, 2015 Author Share Posted March 31, 2015 It seems that when I craft with the item (i set the container item to itself) that the NBT tags are erased, but the item stays in the crafting grid. How can I edit the NBT while crafting? Quote Link to comment Share on other sites More sharing options...
Abastro Posted March 31, 2015 Share Posted March 31, 2015 There is ItemStack version of getItemStack in the Item class: public ItemStack getContainerItem(ItemStack itemStack) You can use it to migrate/modify NBT of the container item. Quote I. Stellarium for Minecraft: Configurable Universe for Minecraft! (WIP) II. Stellar Sky, Better Star Rendering&Sky Utility mod, had separated from Stellarium. Link to comment Share on other sites More sharing options...
ilan321 Posted March 31, 2015 Author Share Posted March 31, 2015 Where do I edit the nbt while crafting? The craft event? Edit: Never mind! I figured it out myself! Apparently you override the getContainerItem method and do what you wish with it. Here's my end result: @Override public ItemStack getContainerItem(ItemStack itemStack) { int uses = itemStack.getTagCompound().getInteger("uses")-1; String owner = itemStack.getTagCompound().getString("owner"); if (uses < 1) { return null; } ItemStack cItem = new ItemStack(getContainerItem()); cItem.setTagCompound(new NBTTagCompound()); cItem.getTagCompound().setInteger("uses", uses); cItem.getTagCompound().setString("owner", owner); return cItem; } Quote Link to comment Share on other sites More sharing options...
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