Add canOpenGui to IChiselItem

src/main/java/com/cricketcraft/chisel/api/IChiselItem.java

@@ -1,6 +1,7 @@
 package com.cricketcraft.chisel.api;
 
 import net.minecraft.block.Block;
+import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.inventory.IInventory;
 import net.minecraft.item.ItemStack;
 import net.minecraft.world.World;
@@ -10,6 +11,19 @@ import net.minecraft.world.World;
  */
 public interface IChiselItem extends IChiselMode {
 
+	/**
+	 * Checks whether the chisel can have its GUI opened
+	 * 
+	 * @param world
+	 *            {@link World} object
+	 * @param player
+	 *            The player holding the chisel. It can always be assumed that the player's current item will be this.
+	 * @param chisel
+	 *            The {@link ItemStack} representing your chisel
+	 * @return True if the GUI should open. False otherwise.
+	 */
+	boolean canOpenGui(World world, EntityPlayer player, ItemStack chisel);
+
 	/**
 	 * Called when an item is chiseled using this chisel
 	 * 

src/main/java/com/cricketcraft/chisel/item/chisel/ChiselController.java

@@ -77,7 +77,7 @@ public final class ChiselController {
 			break;
 		case RIGHT_CLICK_AIR:
 		case RIGHT_CLICK_BLOCK:
-			if (!event.world.isRemote) {
+			if (!event.world.isRemote && chisel.canOpenGui(event.world, event.entityPlayer, held)) {
 				event.entityPlayer.openGui(Chisel.instance, 0, event.world, 0, 0, 0);
 			}
 			break;

src/main/java/com/cricketcraft/chisel/item/chisel/ItemChisel.java

@@ -82,6 +82,11 @@ public class ItemChisel extends Item implements IChiselItem {
 	public ChiselMode getChiselMode(ItemStack itemStack) {
 		return ChiselMode.SINGLE;
 	}
+	
+	@Override
+	public boolean canOpenGui(World world, EntityPlayer player, ItemStack chisel) {
+		return true;
+	}
 
 	@Override
 	public void onChisel(World world, IInventory inv, int slot, ItemStack chisel, ItemStack target) {